Refactor sidebar to use data from serializer

21 files changed, 337 insertions, 195 deletions

diff --git a/app/assets/javascripts/right_sidebar.js b/app/assets/javascripts/right_sidebar.js
index 225e21ad322..93a37e17126 100644
--- a/app/assets/javascripts/right_sidebar.js
+++ b/app/assets/javascripts/right_sidebar.js
@@ -79,11 +79,12 @@ Sidebar.prototype.sidebarToggleClicked = function(e, triggered) {
 Sidebar.prototype.toggleTodo = function(e) {
   var $btnText, $this, $todoLoading, ajaxType, url;
   $this = $(e.currentTarget);
-  ajaxType = $this.attr('data-delete-path') ? 'delete' : 'post';
-  if ($this.attr('data-delete-path')) {
-    url = '' + $this.attr('data-delete-path');
+  ajaxType = $this.data('deletePath') ? 'delete' : 'post';
+
+  if ($this.data('deletePath')) {
+    url = '' + $this.data('deletePath');
   } else {
-    url = '' + $this.data('url');
+    url = '' + $this.data('createPath');
   }
 
   $this.tooltip('hide');
diff --git a/app/controllers/concerns/issuable_actions.rb b/app/controllers/concerns/issuable_actions.rb
index ad9cc0925b7..3d64ae8b775 100644
--- a/app/controllers/concerns/issuable_actions.rb
+++ b/app/controllers/concerns/issuable_actions.rb
@@ -5,7 +5,6 @@ module IssuableActions
   include Gitlab::Utils::StrongMemoize
 
   included do
-    before_action :labels, only: [:show, :new, :edit]
     before_action :authorize_destroy_issuable!, only: :destroy
     before_action :authorize_admin_issuable!, only: :bulk_update
   end
@@ -25,7 +24,10 @@ module IssuableActions
 
   def show
     respond_to do |format|
-      format.html
+      format.html do
+        @issuable_sidebar = serializer.represent(issuable, serializer: 'sidebar') # rubocop:disable Gitlab/ModuleWithInstanceVariables
+      end
+
       format.json do
         render json: serializer.represent(issuable, serializer: params[:serializer])
       end
@@ -168,10 +170,6 @@ module IssuableActions
     end
   end
 
-  def labels
-    @labels ||= LabelsFinder.new(current_user, project_id: @project.id).execute # rubocop:disable Gitlab/ModuleWithInstanceVariables
-  end
-
   def authorize_destroy_issuable!
     unless can?(current_user, :"destroy_#{issuable.to_ability_name}", issuable)
       return access_denied!
diff --git a/app/controllers/projects/merge_requests/conflicts_controller.rb b/app/controllers/projects/merge_requests/conflicts_controller.rb
index ac1969adc6e..26219012121 100644
--- a/app/controllers/projects/merge_requests/conflicts_controller.rb
+++ b/app/controllers/projects/merge_requests/conflicts_controller.rb
@@ -8,7 +8,7 @@ class Projects::MergeRequests::ConflictsController < Projects::MergeRequests::Ap
   def show
     respond_to do |format|
       format.html do
-        labels
+        @issuable_sidebar = serializer.represent(@merge_request, serializer: 'sidebar')
       end
 
       format.json do
@@ -60,9 +60,15 @@ class Projects::MergeRequests::ConflictsController < Projects::MergeRequests::Ap
     end
   end
 
+  private
+
   def authorize_can_resolve_conflicts!
     @conflicts_list = ::MergeRequests::Conflicts::ListService.new(@merge_request)
 
     return render_404 unless @conflicts_list.can_be_resolved_by?(current_user)
   end
+
+  def serializer
+    MergeRequestSerializer.new(current_user: current_user, project: merge_request.project)
+  end
 end
diff --git a/app/controllers/projects/merge_requests_controller.rb b/app/controllers/projects/merge_requests_controller.rb
index da9316d5f22..8b8eac7ff8e 100644
--- a/app/controllers/projects/merge_requests_controller.rb
+++ b/app/controllers/projects/merge_requests_controller.rb
@@ -22,8 +22,7 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
       format.html
       format.json do
         render json: {
-          html: view_to_html_string("projects/merge_requests/_merge_requests"),
-          labels: @labels.as_json(methods: :text_color)
+          html: view_to_html_string("projects/merge_requests/_merge_requests")
         }
       end
     end
@@ -43,8 +42,7 @@ class Projects::MergeRequestsController < Projects::MergeRequests::ApplicationCo
 
         @noteable = @merge_request
         @commits_count = @merge_request.commits_count
-
-        labels
+        @issuable_sidebar = serializer.represent(@merge_request, serializer: 'sidebar')
 
         set_pipeline_variables
 
diff --git a/app/helpers/issuables_helper.rb b/app/helpers/issuables_helper.rb
index ea861bd2fc4..5e277a4c5ed 100644
--- a/app/helpers/issuables_helper.rb
+++ b/app/helpers/issuables_helper.rb
@@ -23,23 +23,36 @@ module IssuablesHelper
     end
   end
 
-  def sidebar_due_date_tooltip_label(issuable)
-    if issuable.due_date
-      "#{_('Due date')}<br />#{due_date_remaining_days(issuable)}"
+  def sidebar_milestone_tooltip_label(milestone)
+    if milestone && milestone[:due_date]
+      "#{milestone[:title]}<br/>#{sidebar_milestone_remaining_days(milestone)}"
     else
-      _('Due date')
+      _('Milestone') + (milestone ? "<br/>#{milestone[:title]}" : "")
     end
   end
 
-  def due_date_remaining_days(issuable)
-    remaining_days_in_words = remaining_days_in_words(issuable)
+  def sidebar_milestone_remaining_days(milestone)
+    due_date_remaining_days(due_date: milestone[:due_date], start_date: milestone[:start_date]) if milestone[:due_date]
+  end
+
+  def sidebar_due_date_tooltip_label(due_date)
+    _('Due date') + (due_date ? "<br/>#{due_date_remaining_days(due_date)}" : "")
+  end
+
+  def due_date_remaining_days(due_date, start_date = nil)
+    "#{due_date.to_s(:medium)} (#{remaining_days_in_words(due_date: due_date, start_date: start_date)})"
+  end
+
+  def sidebar_label_filter_path(base_path, label_name)
+    query_params = {label_name: [label_name]}.to_query
 
-    "#{issuable.due_date.to_s(:medium)} (#{remaining_days_in_words})"
+    "#{base_path}?#{query_params}"
   end
 
   def multi_label_name(current_labels, default_label)
     if current_labels && current_labels.any?
-      title = current_labels.first.try(:title)
+      title = current_labels.first.try(:title) || current_labels.first[:title]
+
       if current_labels.size > 1
         "#{title} +#{current_labels.size - 1} more"
       else
@@ -50,13 +63,13 @@ module IssuablesHelper
     end
   end
 
-  def issuable_json_path(issuable, url_params = {})
+  def issuable_json_path(issuable)
     project = issuable.project
 
     if issuable.is_a?(MergeRequest)
-      project_merge_request_path(project, issuable.iid, :json, url_params)
+      project_merge_request_path(project, issuable.iid, :json)
     else
-      project_issue_path(project, issuable.iid, :json, url_params)
+      project_issue_path(project, issuable.iid, :json)
     end
   end
 
@@ -197,19 +210,11 @@ module IssuablesHelper
     output.join.html_safe
   end
 
-  # rubocop: disable CodeReuse/ActiveRecord
-  def issuable_todo(issuable)
-    if current_user
-      current_user.todos.find_by(target: issuable, state: :pending)
-    end
-  end
-  # rubocop: enable CodeReuse/ActiveRecord
-
   def issuable_labels_tooltip(labels, limit: 5)
     first, last = labels.partition.with_index { |_, i| i < limit  }
 
     if labels && labels.any?
-      label_names = first.collect(&:name)
+      label_names = first.collect { |l| l[:title] }
       label_names << "and #{last.size} more" unless last.empty?
 
       label_names.join(', ')
@@ -356,12 +361,6 @@ module IssuablesHelper
     issuable.model_name.human.downcase
   end
 
-  def selected_labels
-    Array(params[:label_name]).map do |label_name|
-      Label.new(title: label_name)
-    end
-  end
-
   def has_filter_bar_param?
     finder.class.scalar_params.any? { |p| params[p].present? }
   end
@@ -386,22 +385,6 @@ module IssuablesHelper
     params[:issuable_template] if issuable_templates(issuable).any? { |template| template[:name] == params[:issuable_template] }
   end
 
-  def issuable_todo_button_data(issuable, todo, is_collapsed)
-    {
-      todo_text: "Add todo",
-      mark_text: "Mark todo as done",
-      todo_icon: (is_collapsed ? sprite_icon('todo-add') : nil),
-      mark_icon: (is_collapsed ? sprite_icon('todo-done', css_class: 'todo-undone') : nil),
-      issuable_id: issuable.id,
-      issuable_type: issuable.class.name.underscore,
-      url: project_todos_path(@project),
-      delete_path: (dashboard_todo_path(todo) if todo),
-      placement: (is_collapsed ? 'left' : nil),
-      container: (is_collapsed ? 'body' : nil),
-      boundary: 'viewport'
-    }
-  end
-
   def close_reopen_params(issuable, action)
     {
       issuable.model_name.to_s.underscore => { state_event: action }
@@ -418,27 +401,20 @@ module IssuablesHelper
     end
   end
 
-  def issuable_sidebar_options(issuable, can_edit_issuable)
+  def issuable_sidebar_options(sidebar_data)
     {
-      endpoint: issuable_json_path(issuable, serializer: 'sidebar_extras'),
-      toggleSubscriptionEndpoint: toggle_subscription_path(issuable),
-      moveIssueEndpoint: move_namespace_project_issue_path(namespace_id: issuable.project.namespace.to_param, project_id: issuable.project, id: issuable),
-      projectsAutocompleteEndpoint: autocomplete_projects_path(project_id: @project.id),
-      editable: can_edit_issuable,
-      currentUser: UserSerializer.new.represent(current_user),
+      endpoint: "#{sidebar_data[:issuable_json_path]}?serializer=sidebar_extras",
+      toggleSubscriptionEndpoint: sidebar_data[:toggle_subscription_path],
+      moveIssueEndpoint: sidebar_data[:move_issue_path],
+      projectsAutocompleteEndpoint: sidebar_data[:projects_autocomplete_path],
+      editable: sidebar_data[:can_edit],
+      currentUser: sidebar_data[:current_user],
       rootPath: root_path,
-      fullPath: @project.full_path
+      fullPath: sidebar_data[:project_full_path]
     }
   end
 
   def parent
     @project || @group
   end
-
-  def issuable_milestone_tooltip_title(issuable)
-    if issuable.milestone
-      milestone_tooltip = milestone_tooltip_title(issuable.milestone)
-      _('Milestone') + (milestone_tooltip ? ': ' + milestone_tooltip : '')
-    end
-  end
 end
diff --git a/app/helpers/milestones_helper.rb b/app/helpers/milestones_helper.rb
index 9666080092b..e3dc598e98a 100644
--- a/app/helpers/milestones_helper.rb
+++ b/app/helpers/milestones_helper.rb
@@ -114,12 +114,6 @@ module MilestonesHelper
     end
   end
 
-  def milestone_tooltip_title(milestone)
-    if milestone
-      "#{milestone.title}<br />#{milestone_tooltip_due_date(milestone)}"
-    end
-  end
-
   def milestone_time_for(date, date_type)
     title = date_type == :start ? "Start date" : "End date"
 
diff --git a/app/models/user.rb b/app/models/user.rb
index f20756d1cc3..6b60932a1b2 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1422,6 +1422,10 @@ class User < ActiveRecord::Base
     todos.where(id: ids)
   end
 
+  def pending_todo_for(target)
+    todos.find_by(target: target, state: :pending)
+  end
+
   # @deprecated
   alias_method :owned_or_masters_groups, :owned_or_maintainers_groups
 
diff --git a/app/serializers/entity_date_helper.rb b/app/serializers/entity_date_helper.rb
index cc0c2abf863..87bba87a0ed 100644
--- a/app/serializers/entity_date_helper.rb
+++ b/app/serializers/entity_date_helper.rb
@@ -45,13 +45,16 @@ module EntityDateHelper
   # If due date is provided, it returns "# days|weeks|months remaining|ago"
   # If start date is provided and elapsed, with no due date, it returns "# days elapsed"
   def remaining_days_in_words(entity)
-    if entity.try(:expired?)
+    start_date = entity.try(:start_date) || entity.try(:[], :start_date)
+    due_date = entity.try(:due_date) || entity.try(:[], :due_date)
+
+    if due_date && due_date.past?
       content_tag(:strong, 'Past due')
-    elsif entity.try(:upcoming?)
+    elsif start_date && start_date.future?
       content_tag(:strong, 'Upcoming')
-    elsif entity.due_date
-      is_upcoming = (entity.due_date - Date.today).to_i > 0
-      time_ago = time_ago_in_words(entity.due_date)
+    elsif due_date
+      is_upcoming = (due_date - Date.today).to_i > 0
+      time_ago = time_ago_in_words(due_date)
 
       # https://gitlab.com/gitlab-org/gitlab-ce/issues/49440
       #
@@ -63,8 +66,8 @@ module EntityDateHelper
       remaining_or_ago = is_upcoming ? _("remaining") : _("ago")
 
       "#{content} #{remaining_or_ago}".html_safe
-    elsif entity.start_date && entity.start_date.past?
-      days = entity.elapsed_days
+    elsif start_date && start_date.past?
+      days = (Date.today - start_date).to_i
       "#{content_tag(:strong, days)} #{'day'.pluralize(days)} elapsed".html_safe
     end
   end
diff --git a/app/serializers/issuable_sidebar_entity.rb b/app/serializers/issuable_sidebar_entity.rb
index 9af2276b362..11666049959 100644
--- a/app/serializers/issuable_sidebar_entity.rb
+++ b/app/serializers/issuable_sidebar_entity.rb
@@ -3,6 +3,109 @@
 class IssuableSidebarEntity < Grape::Entity
   include RequestAwareEntity
 
+  with_options if: { include_basic: true } do
+    expose :id
+    expose :type do |issuable|
+      issuable.to_ability_name
+    end
+    expose :author_id
+    expose :project_id do |issuable|
+      issuable.project.id
+    end
+    expose :discussion_locked?, as: :discussion_locked
+    expose :reference do |issuable|
+      issuable.to_reference(issuable.project, full: true)
+    end
+
+    expose :current_user, using: UserEntity do |issuable|
+      request.current_user
+    end
+
+    # Relationships
+    expose :todo, using: IssuableSidebarTodoEntity do |issuable|
+      request.current_user.pending_todo_for(issuable) if request.current_user
+    end
+    expose :milestone, using: ::API::Entities::Milestone
+    expose :labels, using: LabelEntity
+
+    # Permissions
+    expose :signed_in do |issuable|
+      request.current_user.present?
+    end
+
+    expose :can_edit do |issuable|
+      can?(request.current_user, :"admin_#{issuable.to_ability_name}", issuable.project)
+    end
+
+    expose :can_move do |issuable|
+      request.current_user && issuable.can_move?(request.current_user)
+    end
+
+    expose :can_admin_label do |issuable|
+      can?(request.current_user, :admin_label, issuable.project)
+    end
+
+    # Paths
+    expose :issuable_json_path do |issuable|
+      if issuable.is_a?(MergeRequest)
+        project_merge_request_path(issuable.project, issuable.iid, :json)
+      else
+        project_issue_path(issuable.project, issuable.iid, :json)
+      end
+    end
+
+    expose :namespace_path do |issuable|
+      issuable.project.namespace.full_path
+    end
+
+    expose :project_path do |issuable|
+      issuable.project.path
+    end
+
+    expose :project_full_path do |issuable|
+      issuable.project.full_path
+    end
+
+    expose :project_issuables_path do |issuable|
+      project = issuable.project
+      namespace = project.namespace
+
+      if issuable.is_a?(MergeRequest)
+        namespace_project_merge_requests_path(namespace, project)
+      else
+        namespace_project_issues_path(namespace, project)
+      end
+    end
+
+    expose :create_todo_path do |issuable|
+      project_todos_path(issuable.project)
+    end
+
+    expose :project_milestones_path do |issuable|
+      project_milestones_path(issuable.project, :json)
+    end
+
+    expose :project_labels_path do |issuable|
+      project_labels_path(issuable.project, :json, include_ancestor_groups: true)
+    end
+
+    expose :toggle_subscription_path do |issuable|
+      toggle_subscription_path(issuable)
+    end
+
+    expose :move_issue_path do |issuable|
+      move_namespace_project_issue_path(
+        namespace_id: issuable.project.namespace.to_param,
+        project_id: issuable.project,
+        id: issuable
+      )
+    end
+
+    expose :projects_autocomplete_path do |issuable|
+      autocomplete_projects_path(project_id: issuable.project.id)
+    end
+  end
+
   with_options if: { include_extras: true } do
     include TimeTrackableEntity
 
diff --git a/app/serializers/issuable_sidebar_todo_entity.rb b/app/serializers/issuable_sidebar_todo_entity.rb
new file mode 100644
index 00000000000..b2c98433f05
--- /dev/null
+++ b/app/serializers/issuable_sidebar_todo_entity.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+class IssuableSidebarTodoEntity < Grape::Entity
+  include Gitlab::Routing
+
+  expose :id
+
+  expose :delete_path do |todo|
+    dashboard_todo_path(todo) if todo
+  end
+end
diff --git a/app/serializers/issue_serializer.rb b/app/serializers/issue_serializer.rb
index cdb386b83b9..93625ff3afc 100644
--- a/app/serializers/issue_serializer.rb
+++ b/app/serializers/issue_serializer.rb
@@ -7,9 +7,9 @@ class IssueSerializer < BaseSerializer
   def represent(issue, opts = {})
     entity =
       case opts[:serializer]
-      when 'sidebar_extras'
-        opts[:include_basic] = false
-        opts[:include_extras] = true
+      when 'sidebar', 'sidebar_extras'
+        opts[:include_basic] = (opts[:serializer] == 'sidebar')
+        opts[:include_extras] = (opts[:serializer] == 'sidebar_extras')
         IssueSidebarEntity
       when 'board'
         IssueBoardEntity
diff --git a/app/serializers/issue_sidebar_entity.rb b/app/serializers/issue_sidebar_entity.rb
index 1b73ead5cd7..d50e19ad046 100644
--- a/app/serializers/issue_sidebar_entity.rb
+++ b/app/serializers/issue_sidebar_entity.rb
@@ -1,6 +1,11 @@
 # frozen_string_literal: true
 
 class IssueSidebarEntity < IssuableSidebarEntity
+  with_options if: { include_basic: true } do
+    expose :due_date
+    expose :confidential
+  end
+
   with_options if: { include_extras: true } do
     expose :assignees, using: API::Entities::UserBasic
   end
diff --git a/app/serializers/merge_request_serializer.rb b/app/serializers/merge_request_serializer.rb
index e252d9a3501..4d236273d49 100644
--- a/app/serializers/merge_request_serializer.rb
+++ b/app/serializers/merge_request_serializer.rb
@@ -7,9 +7,9 @@ class MergeRequestSerializer < BaseSerializer
   def represent(merge_request, opts = {})
     entity =
       case opts[:serializer]
-      when 'sidebar_extras'
-        opts[:include_basic] = false
-        opts[:include_extras] = true
+      when 'sidebar', 'sidebar_extras'
+        opts[:include_basic] = (opts[:serializer] == 'sidebar')
+        opts[:include_extras] = (opts[:serializer] == 'sidebar_extras')
         MergeRequestSidebarEntity
       when 'basic'
         MergeRequestBasicEntity
diff --git a/app/serializers/merge_request_sidebar_entity.rb b/app/serializers/merge_request_sidebar_entity.rb
index 70607230642..a861f2ea73b 100644
--- a/app/serializers/merge_request_sidebar_entity.rb
+++ b/app/serializers/merge_request_sidebar_entity.rb
@@ -1,4 +1,11 @@
 # frozen_string_literal: true
 
 class MergeRequestSidebarEntity < IssuableSidebarEntity
+  with_options if: { include_basic: true } do
+    expose :assignee, using: API::Entities::UserBasic
+
+    expose :can_merge do |issuable|
+      issuable.can_be_merged_by?(issuable.assignee) if issuable.assignee
+    end
+  end
 end
diff --git a/app/views/projects/issues/show.html.haml b/app/views/projects/issues/show.html.haml
index b50b3ca207b..d862640197a 100644
--- a/app/views/projects/issues/show.html.haml
+++ b/app/views/projects/issues/show.html.haml
@@ -88,4 +88,4 @@
   %section.issuable-discussion
     = render 'projects/issues/discussion'
 
-= render 'shared/issuable/sidebar', issuable: @issue
+= render 'shared/issuable/sidebar', issuable: @issue, issuable_sidebar: @issuable_sidebar
diff --git a/app/views/projects/merge_requests/conflicts/show.html.haml b/app/views/projects/merge_requests/conflicts/show.html.haml
index a6e2565a485..ede37c11e64 100644
--- a/app/views/projects/merge_requests/conflicts/show.html.haml
+++ b/app/views/projects/merge_requests/conflicts/show.html.haml
@@ -6,7 +6,7 @@
 .merge-request-details.issuable-details
   = render "projects/merge_requests/mr_box"
 
-= render 'shared/issuable/sidebar', issuable: @merge_request
+= render 'shared/issuable/sidebar', issuable: @merge_request, issuable_sidebar: @issuable_sidebar
 
 #conflicts{ "v-cloak" => "true", data: { conflicts_path: conflicts_project_merge_request_path(@merge_request.project, @merge_request, format: :json),
     resolve_conflicts_path: resolve_conflicts_project_merge_request_path(@merge_request.project, @merge_request) } }
diff --git a/app/views/projects/merge_requests/show.html.haml b/app/views/projects/merge_requests/show.html.haml
index cc9292b54d7..4ebf8afd669 100644
--- a/app/views/projects/merge_requests/show.html.haml
+++ b/app/views/projects/merge_requests/show.html.haml
@@ -86,7 +86,8 @@
     .mr-loading-status
       = spinner
 
-= render 'shared/issuable/sidebar', issuable: @merge_request
+= render 'shared/issuable/sidebar', issuable: @merge_request, issuable_sidebar: @issuable_sidebar
+
 - if @merge_request.can_be_reverted?(current_user)
   = render "projects/commit/change", type: 'revert', commit: @merge_request.merge_commit, title: @merge_request.title
 - if @merge_request.can_be_cherry_picked?
diff --git a/app/views/shared/issuable/_sidebar.html.haml b/app/views/shared/issuable/_sidebar.html.haml
index 9eecfa39390..18093e5996b 100644
--- a/app/views/shared/issuable/_sidebar.html.haml
+++ b/app/views/shared/issuable/_sidebar.html.haml
@@ -1,32 +1,34 @@
-- todo = issuable_todo(issuable)
+- issuable_type = issuable_sidebar[:type]
+- signed_in = issuable_sidebar[:signed_in]
+- can_edit_issuable = issuable_sidebar[:can_edit]
 
-%aside.right-sidebar.js-right-sidebar.js-issuable-sidebar{ data: { signed: { in: current_user.present? } }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }
-  .issuable-sidebar{ data: { endpoint: "#{issuable_json_path(issuable)}" } }
-    - can_edit_issuable = can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
+%aside.right-sidebar.js-right-sidebar.js-issuable-sidebar{ data: { signed: { in: signed_in } }, class: sidebar_gutter_collapsed_class, 'aria-live' => 'polite' }
+  .issuable-sidebar
     .block.issuable-sidebar-header
-      - if current_user
+      - if signed_in
         %span.issuable-header-text.hide-collapsed.float-left
           = _('Todo')
       %a.gutter-toggle.float-right.js-sidebar-toggle.has-tooltip{ role: "button", href: "#", "aria-label" => "Toggle sidebar", title: sidebar_gutter_tooltip_text, data: { container: 'body', placement: 'left', boundary: 'viewport' } }
         = sidebar_gutter_toggle_icon
-      - if current_user
-        = render "shared/issuable/sidebar_todo", todo: todo, issuable: issuable
+      - if signed_in
+        = render "shared/issuable/sidebar_todo", issuable_sidebar: issuable_sidebar
 
-    = form_for [@project.namespace.becomes(Namespace), @project, issuable], remote: true, format: :json, html: { class: 'issuable-context-form inline-update js-issuable-update' } do |f|
-      - if current_user
+    = form_for issuable_type, url: issuable_sidebar[:issuable_json_path], remote: true, html: { class: 'issuable-context-form inline-update js-issuable-update' } do |f|
+      - if signed_in
         .block.todo.hide-expanded
-          = render "shared/issuable/sidebar_todo", todo: todo, issuable: issuable, is_collapsed: true
+          = render "shared/issuable/sidebar_todo", issuable_sidebar: issuable_sidebar, is_collapsed: true
       .block.assignee.qa-assignee-block
-        = render "shared/issuable/sidebar_assignees", issuable: issuable, can_edit_issuable: can_edit_issuable, signed_in: current_user.present?
+        = render "shared/issuable/sidebar_assignees", issuable: issuable, issuable_sidebar: issuable_sidebar
 
-      = render_if_exists 'shared/issuable/sidebar_item_epic', issuable: issuable
+      = render_if_exists 'shared/issuable/sidebar_item_epic', issuable_sidebar: issuable_sidebar
 
+      - milestone = issuable_sidebar[:milestone] || {}
       .block.milestone
-        .sidebar-collapsed-icon.has-tooltip{ title: milestone_tooltip_title(issuable.milestone), data: { container: 'body', html: 'true', placement: 'left', boundary: 'viewport' } }
+        .sidebar-collapsed-icon.has-tooltip{ title: sidebar_milestone_tooltip_label(milestone), data: { container: 'body', html: 'true', placement: 'left', boundary: 'viewport' } }
           = icon('clock-o', 'aria-hidden': 'true')
           %span.milestone-title.collapse-truncated-title
-            - if issuable.milestone
-              = issuable.milestone.title
+            - if milestone.present?
+              = milestone[:title]
             - else
               = _('None')
         .title.hide-collapsed
@@ -35,49 +37,50 @@
           - if can_edit_issuable
             = link_to _('Edit'), '#', class: 'js-sidebar-dropdown-toggle edit-link float-right'
         .value.hide-collapsed
-          - if issuable.milestone
-            = link_to issuable.milestone.title, milestone_path(issuable.milestone), class: "bold has-tooltip", title: milestone_tooltip_due_date(issuable.milestone), data: { container: "body", html: 'true', boundary: 'viewport' }
+          - if milestone.present?
+            = link_to milestone[:title], milestone[:web_url], class: "bold has-tooltip", title: sidebar_milestone_remaining_days(milestone), data: { container: "body", html: 'true', boundary: 'viewport' }
           - else
             %span.no-value
               = _('None')
 
         .selectbox.hide-collapsed
-          = f.hidden_field 'milestone_id', value: issuable.milestone_id, id: nil
-          = dropdown_tag('Milestone', options: { title: _('Assign milestone'), toggle_class: 'js-milestone-select js-extra-options', filter: true, dropdown_class: 'dropdown-menu-selectable', placeholder: _('Search milestones'), data: { show_no: true, field_name: "#{issuable.to_ability_name}[milestone_id]", project_id: @project.id, issuable_id: issuable.id, milestones: project_milestones_path(@project, :json), ability_name: issuable.to_ability_name, issue_update: issuable_json_path(issuable), use_id: true, default_no: true, selected: (issuable.milestone.name if issuable.milestone), null_default: true, display: 'static' }})
-      - if issuable.has_attribute?(:time_estimate)
-        #issuable-time-tracker.block
-          // Fallback while content is loading
-          .title.hide-collapsed
-            = _('Time tracking')
-            = icon('spinner spin', 'aria-hidden': 'true')
-      - if issuable.has_attribute?(:due_date)
+          = f.hidden_field 'milestone_id', value: milestone[:id], id: nil
+          = dropdown_tag('Milestone', options: { title: _('Assign milestone'), toggle_class: 'js-milestone-select js-extra-options', filter: true, dropdown_class: 'dropdown-menu-selectable', placeholder: _('Search milestones'), data: { show_no: true, field_name: "#{issuable_type}[milestone_id]", project_id: issuable_sidebar[:project_id], issuable_id: issuable_sidebar[:id], milestones: issuable_sidebar[:project_milestones_path], ability_name: issuable_type, issue_update: issuable_sidebar[:issuable_json_path], use_id: true, default_no: true, selected: milestone[:title], null_default: true, display: 'static' }})
+
+      #issuable-time-tracker.block
+        // Fallback while content is loading
+        .title.hide-collapsed
+          = _('Time tracking')
+          = icon('spinner spin', 'aria-hidden': 'true')
+
+      - if issuable_sidebar.has_key?(:due_date)
         .block.due_date
-          .sidebar-collapsed-icon.has-tooltip{ data: { placement: 'left', container: 'body', html: 'true', boundary: 'viewport' }, title: sidebar_due_date_tooltip_label(issuable) }
+          .sidebar-collapsed-icon.has-tooltip{ data: { placement: 'left', container: 'body', html: 'true', boundary: 'viewport' }, title: sidebar_due_date_tooltip_label(issuable_sidebar[:due_date]) }
             = icon('calendar', 'aria-hidden': 'true')
             %span.js-due-date-sidebar-value
-              = issuable.due_date.try(:to_s, :medium) || 'None'
+              = issuable_sidebar[:due_date].try(:to_s, :medium) || 'None'
           .title.hide-collapsed
             = _('Due date')
             = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
-            - if can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
+            - if can_edit_issuable
               = link_to _('Edit'), '#', class: 'js-sidebar-dropdown-toggle edit-link float-right'
           .value.hide-collapsed
             %span.value-content
-              - if issuable.due_date
-                %span.bold= issuable.due_date.to_s(:medium)
+              - if issuable_sidebar[:due_date]
+                %span.bold= issuable_sidebar[:due_date].to_s(:medium)
               - else
                 %span.no-value
                   = _('No due date')
-            - if can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
-              %span.no-value.js-remove-due-date-holder{ class: ("hidden" if issuable.due_date.nil?) }
+            - if can_edit_issuable
+              %span.no-value.js-remove-due-date-holder{ class: ("hidden" if issuable_sidebar[:due_date].nil?) }
                 \-
                 %a.js-remove-due-date{ href: "#", role: "button" }
                   = _('remove due date')
-          - if can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
+          - if can_edit_issuable
             .selectbox.hide-collapsed
-              = f.hidden_field :due_date, value: issuable.due_date.try(:strftime, 'yy-mm-dd')
+              = f.hidden_field :due_date, value: issuable_sidebar[:due_date].try(:strftime, 'yy-mm-dd')
               .dropdown
-                %button.dropdown-menu-toggle.js-due-date-select{ type: 'button', data: { toggle: 'dropdown', field_name: "#{issuable.to_ability_name}[due_date]", ability_name: issuable.to_ability_name, issue_update: issuable_json_path(issuable), display: 'static' } }
+                %button.dropdown-menu-toggle.js-due-date-select{ type: 'button', data: { toggle: 'dropdown', field_name: "#{issuable_type}[due_date]", ability_name: issuable_type, issue_update: issuable_sidebar[:issuable_json_path], display: 'static' } }
                   %span.dropdown-toggle-text
                     = _('Due date')
                   = icon('chevron-down', 'aria-hidden': 'true')
@@ -86,56 +89,56 @@
                   = dropdown_content do
                     .js-due-date-calendar
 
-      - if @labels
-        - selected_labels = issuable.labels
-        .block.labels
-          .sidebar-collapsed-icon.js-sidebar-labels-tooltip{ title: issuable_labels_tooltip(issuable.labels_array), data: { placement: "left", container: "body", boundary: 'viewport' } }
-            = icon('tags', 'aria-hidden': 'true')
-            %span
-              = selected_labels.size
-          .title.hide-collapsed
-            = _('Labels')
-            = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
-            - if can_edit_issuable
-              = link_to _('Edit'), '#', class: 'js-sidebar-dropdown-toggle edit-link float-right'
-          .value.issuable-show-labels.dont-hide.hide-collapsed.qa-labels-block{ class: ("has-labels" if selected_labels.any?) }
-            - if selected_labels.any?
-              - selected_labels.each do |label|
-                = link_to_label(label, subject: issuable.project, type: issuable.to_ability_name)
-            - else
-              %span.no-value
-                = _('None')
-          .selectbox.hide-collapsed
+      - selected_labels = issuable_sidebar[:labels]
+      .block.labels
+        .sidebar-collapsed-icon.js-sidebar-labels-tooltip{ title: issuable_labels_tooltip(selected_labels), data: { placement: "left", container: "body", boundary: 'viewport' } }
+          = icon('tags', 'aria-hidden': 'true')
+          %span
+            = selected_labels.size
+        .title.hide-collapsed
+          = _('Labels')
+          = icon('spinner spin', class: 'hidden block-loading', 'aria-hidden': 'true')
+          - if can_edit_issuable
+            = link_to _('Edit'), '#', class: 'js-sidebar-dropdown-toggle edit-link float-right'
+        .value.issuable-show-labels.dont-hide.hide-collapsed.qa-labels-block{ class: ("has-labels" if selected_labels.any?) }
+          - if selected_labels.any?
             - selected_labels.each do |label|
-              = hidden_field_tag "#{issuable.to_ability_name}[label_names][]", label.id, id: nil
-            .dropdown
-              %button.dropdown-menu-toggle.js-label-select.js-multiselect.js-label-sidebar-dropdown{ type: "button", data: {toggle: "dropdown", default_label: "Labels", field_name: "#{issuable.to_ability_name}[label_names][]", ability_name: issuable.to_ability_name, show_no: "true", show_any: "true", namespace_path: @project.try(:namespace).try(:full_path), project_path: @project.try(:path), issue_update: issuable_json_path(issuable), labels: (labels_filter_path_with_defaults if @project), display: 'static' } }
-                %span.dropdown-toggle-text{ class: ("is-default" if selected_labels.empty?) }
-                  = multi_label_name(selected_labels, "Labels")
-                = icon('chevron-down', 'aria-hidden': 'true')
-              .dropdown-menu.dropdown-select.dropdown-menu-paging.dropdown-menu-labels.dropdown-menu-selectable
-                = render partial: "shared/issuable/label_page_default"
-                - if can? current_user, :admin_label, @project and @project
-                  = render partial: "shared/issuable/label_page_create"
-
-      = render_if_exists 'shared/issuable/sidebar_weight', issuable: issuable
-
-      - if issuable.has_attribute?(:confidential)
+              = link_to sidebar_label_filter_path(issuable_sidebar[:project_issuables_path], label[:title]) do
+                %span.badge.color-label.has-tooltip{ style: "background-color: #{label[:color]}; color: #{label[:text_color]}", title: label[:description], data: { container: "body" } }
+                  = label[:title]
+          - else
+            %span.no-value
+              = _('None')
+        .selectbox.hide-collapsed
+          - selected_labels.each do |label|
+            = hidden_field_tag "#{issuable_type}[label_names][]", label[:id], id: nil
+          .dropdown
+            %button.dropdown-menu-toggle.js-label-select.js-multiselect.js-label-sidebar-dropdown{ type: "button", data: {toggle: "dropdown", default_label: "Labels", field_name: "#{issuable_type}[label_names][]", ability_name: issuable_type, show_no: "true", show_any: "true", namespace_path: issuable_sidebar[:namespace_path], project_path: issuable_sidebar[:project_path], issue_update: issuable_sidebar[:issuable_json_path], labels: issuable_sidebar[:project_labels_path], display: 'static' } }
+              %span.dropdown-toggle-text{ class: ("is-default" if selected_labels.empty?) }
+                = multi_label_name(selected_labels, "Labels")
+              = icon('chevron-down', 'aria-hidden': 'true')
+            .dropdown-menu.dropdown-select.dropdown-menu-paging.dropdown-menu-labels.dropdown-menu-selectable
+              = render partial: "shared/issuable/label_page_default"
+              - if issuable_sidebar[:can_admin_label]
+                = render partial: "shared/issuable/label_page_create"
+
+      = render_if_exists 'shared/issuable/sidebar_weight', issuable_sidebar: issuable_sidebar
+
+      - if issuable_sidebar.has_key?(:confidential)
         -# haml-lint:disable InlineJavaScript
-        %script#js-confidential-issue-data{ type: "application/json" }= { is_confidential: @issue.confidential, is_editable: can_edit_issuable }.to_json.html_safe
+        %script#js-confidential-issue-data{ type: "application/json" }= { is_confidential: issuable_sidebar[:confidential], is_editable: can_edit_issuable }.to_json.html_safe
         #js-confidential-entry-point
 
-      - if issuable.has_attribute?(:discussion_locked)
-        -# haml-lint:disable InlineJavaScript
-        %script#js-lock-issue-data{ type: "application/json" }= { is_locked: issuable.discussion_locked?, is_editable: can_edit_issuable }.to_json.html_safe
-        #js-lock-entry-point
+      -# haml-lint:disable InlineJavaScript
+      %script#js-lock-issue-data{ type: "application/json" }= { is_locked: issuable_sidebar[:discussion_locked], is_editable: can_edit_issuable }.to_json.html_safe
+      #js-lock-entry-point
 
       .js-sidebar-participants-entry-point
 
-      - if current_user
+      - if signed_in
         .js-sidebar-subscriptions-entry-point
 
-      - project_ref = cross_project_reference(@project, issuable)
+      - project_ref = issuable_sidebar[:reference]
       .block.project-reference
         .sidebar-collapsed-icon.dont-change-state
           = clipboard_button(text: project_ref, title: _('Copy reference to clipboard'), placement: "left", boundary: 'viewport')
@@ -145,7 +148,8 @@
             %cite{ title: project_ref }
               = project_ref
           = clipboard_button(text: project_ref, title: _('Copy reference to clipboard'), placement: "left", boundary: 'viewport')
-      - if current_user && issuable.can_move?(current_user)
+
+      - if issuable_sidebar[:can_move]
         .block.js-sidebar-move-issue-block
           .sidebar-collapsed-icon{ data: { toggle: 'tooltip', placement: 'left', container: 'body', boundary: 'viewport' }, title: _('Move issue') }
             = custom_icon('icon_arrow_right')
@@ -164,4 +168,4 @@
                   = icon('spinner spin', class: 'sidebar-move-issue-confirmation-loading-icon')
 
     -# haml-lint:disable InlineJavaScript
-    %script.js-sidebar-options{ type: "application/json" }= issuable_sidebar_options(issuable, can_edit_issuable).to_json.html_safe
+    %script.js-sidebar-options{ type: "application/json" }= issuable_sidebar_options(issuable_sidebar).to_json.html_safe
diff --git a/app/views/shared/issuable/_sidebar_assignees.html.haml b/app/views/shared/issuable/_sidebar_assignees.html.haml
index 8a13c7a3b83..25e4f0dc14e 100644
--- a/app/views/shared/issuable/_sidebar_assignees.html.haml
+++ b/app/views/shared/issuable/_sidebar_assignees.html.haml
@@ -1,11 +1,15 @@
-- if issuable.is_a?(Issue)
-  #js-vue-sidebar-assignees{ data: { field: "#{issuable.to_ability_name}[assignee_ids]", signed_in: signed_in } }
+- issuable_type = issuable_sidebar[:type]
+- signed_in = issuable_sidebar[:signed_in]
+- can_edit_issuable = issuable_sidebar[:can_edit]
+
+- if issuable_type == "issue"
+  #js-vue-sidebar-assignees{ data: { field: "#{issuable_type}[assignee_ids]", signed_in: signed_in } }
     .title.hide-collapsed
       = _('Assignee')
       = icon('spinner spin')
 - else
-  .sidebar-collapsed-icon.sidebar-collapsed-user{ data: { toggle: "tooltip", placement: "left", container: "body", boundary: 'viewport' }, title: sidebar_assignee_tooltip_label(issuable) }
-    - if issuable.assignee
+  .sidebar-collapsed-icon.sidebar-collapsed-user{ data: { toggle: "tooltip", placement: "left", container: "body", boundary: 'viewport' }, title: (issuable_sidebar.dig(:assignee, :name) || _('Assignee')) }
+    - if issuable_sidebar[:assignee]
       = link_to_member(@project, issuable.assignee, size: 24)
     - else
       = icon('user', 'aria-hidden': 'true')
@@ -18,13 +22,13 @@
       %a.gutter-toggle.float-right.js-sidebar-toggle{ role: "button", href: "#", "aria-label" => _('Toggle sidebar') }
         = sidebar_gutter_toggle_icon
   .value.hide-collapsed
-    - if issuable.assignee
+    - if issuable_sidebar[:assignee]
       = link_to_member(@project, issuable.assignee, size: 32, extra_class: 'bold') do
-        - if !issuable.can_be_merged_by?(issuable.assignee)
+        - if issuable_sidebar[:can_merge]
           %span.float-right.cannot-be-merged{ data: { toggle: 'tooltip', placement: 'left' }, title: _('Not allowed to merge') }
             = icon('exclamation-triangle', 'aria-hidden': 'true')
         %span.username
-          = issuable.assignee.to_reference
+          @#{issuable_sidebar[:assignee][:username]}
     - else
       %span.assign-yourself.no-value
         = _('No assignee')
@@ -34,19 +38,33 @@
             = _('assign yourself')
 
 .selectbox.hide-collapsed
-  - issuable.assignees.each do |assignee|
-    = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", assignee.id, id: nil, data: { avatar_url: assignee.avatar_url, name: assignee.name, username: assignee.username }
+  - if issuable.assignees.none?
+    = hidden_field_tag "#{issuable_type}[assignee_ids][]", 0, id: nil
+  - else
+    - issuable.assignees.each do |assignee|
+      = hidden_field_tag "#{issuable_type}[assignee_ids][]", assignee.id, id: nil, data: { avatar_url: assignee.avatar_url, name: assignee.name, username: assignee.username }
 
-  - options = { toggle_class: 'js-user-search js-author-search', title: _('Assign to'), filter: true, dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author', placeholder: _('Search users'), data: { first_user: current_user&.username, current_user: true, project_id: @project&.id, author_id: issuable.author_id, field_name: "#{issuable.to_ability_name}[assignee_ids][]", issue_update: issuable_json_path(issuable), ability_name: issuable.to_ability_name, null_user: true, display: 'static' } }
+  - options = { toggle_class: 'js-user-search js-author-search',
+    title: _('Assign to'),
+    filter: true,
+    dropdown_class: 'dropdown-menu-user dropdown-menu-selectable dropdown-menu-author',
+    placeholder: _('Search users'),
+    data: { first_user: issuable_sidebar.dig(:current_user, :username),
+      current_user: true,
+      project_id: issuable_sidebar[:project_id],
+      author_id: issuable_sidebar[:author_id],
+      field_name: "#{issuable_type}[assignee_ids][]",
+      issue_update: issuable_sidebar[:issuable_json_path],
+      ability_name: issuable_type,
+      null_user: true,
+      display: 'static' } }
   - title = _('Select assignee')
 
-  - if issuable.is_a?(Issue)
-    - unless issuable.assignees.any?
-      = hidden_field_tag "#{issuable.to_ability_name}[assignee_ids][]", 0, id: nil
+  - if issuable_type == "issue"
     - dropdown_options = issue_assignees_dropdown_options
     - title = dropdown_options[:title]
     - options[:toggle_class] += ' js-multiselect js-save-user-data'
-    - data = { field_name: "#{issuable.to_ability_name}[assignee_ids][]" }
+    - data = { field_name: "#{issuable_type}[assignee_ids][]" }
     - data[:multi_select] = true
     - data['dropdown-title'] = title
     - data['dropdown-header'] = dropdown_options[:data][:'dropdown-header']
diff --git a/app/views/shared/issuable/_sidebar_todo.html.haml b/app/views/shared/issuable/_sidebar_todo.html.haml
index 660ee6d5777..8411327566b 100644
--- a/app/views/shared/issuable/_sidebar_todo.html.haml
+++ b/app/views/shared/issuable/_sidebar_todo.html.haml
@@ -1,14 +1,28 @@
 - is_collapsed = local_assigns.fetch(:is_collapsed, false)
-- mark_content = is_collapsed ? sprite_icon('todo-done', css_class: 'todo-undone') : _('Mark todo as done')
-- todo_content = is_collapsed ? sprite_icon('todo-add') : _('Add todo')
+- todo = issuable_sidebar[:todo] || {}
+
+- todo_text = _('Add todo')
+- mark_text = _('Mark todo as done')
+- todo_icon = sprite_icon('todo-add')
+- mark_icon = sprite_icon('todo-done', css_class: 'todo-undone')
+
+- mark_content = is_collapsed ? mark_icon : mark_text
+- todo_content = is_collapsed ? todo_icon : todo_text
 
 %button.issuable-todo-btn.js-issuable-todo{ type: 'button',
   class: (is_collapsed ? 'btn-blank sidebar-collapsed-icon dont-change-state has-tooltip' : 'btn btn-default issuable-header-btn float-right'),
-  title: (todo.nil? ? _('Add todo') : _('Mark todo as done')),
-  'aria-label' => (todo.nil? ? _('Add todo') : _('Mark todo as done')),
-  data: issuable_todo_button_data(issuable, todo, is_collapsed) }
+  title: (todo[:id] ? mark_text : todo_text),
+  'aria-label' => (todo[:id] ? mark_text : todo_text),
+  data: { todo_text: todo_text,
+    mark_text: mark_text,
+    todo_icon: is_collapsed ? todo_icon : nil,
+    mark_icon: is_collapsed ? mark_icon : nil,
+    issuable_id: issuable_sidebar[:id],
+    issuable_type: issuable_sidebar[:type],
+    create_path: issuable_sidebar[:create_todo_path],
+    delete_path: todo[:delete_path] } }
   %span.issuable-todo-inner.js-issuable-todo-inner<
-    - if todo
+    - if todo[:id]
       = mark_content
     - else
       = todo_content
diff --git a/app/views/shared/issuable/form/_metadata.html.haml b/app/views/shared/issuable/form/_metadata.html.haml
index ac8d58c0bfe..e370dff9526 100644
--- a/app/views/shared/issuable/form/_metadata.html.haml
+++ b/app/views/shared/issuable/form/_metadata.html.haml
@@ -19,10 +19,9 @@
         .issuable-form-select-holder
           = render "shared/issuable/milestone_dropdown", selected: issuable.milestone, name: "#{issuable.class.model_name.param_key}[milestone_id]", show_any: false, show_upcoming: false, show_started: false, extra_class: "qa-issuable-milestone-dropdown js-issuable-form-dropdown js-dropdown-keep-input", dropdown_title: "Select milestone"
     .form-group.row
-      - has_labels = @labels && @labels.any?
       = form.label :label_ids, "Labels", class: "col-form-label #{has_due_date ? "col-md-2 col-lg-4" : "col-sm-2"}"
       = form.hidden_field :label_ids, multiple: true, value: ''
-      .col-sm-10{ class: "#{"col-md-8" if has_due_date} #{'issuable-form-padding-top' if !has_labels}" }
+      .col-sm-10{ class: "#{"col-md-8" if has_due_date}" }
         .issuable-form-select-holder
           = render "shared/issuable/label_dropdown", classes: ["js-issuable-form-dropdown"], selected: issuable.labels, data_options: { field_name: "#{issuable.class.model_name.param_key}[label_ids][]", show_any: false }, dropdown_title: "Select label"