Add reply to notes to turn into discussions

15 files changed, 138 insertions, 24 deletions

diff --git a/app/assets/javascripts/notes/components/note_actions.vue b/app/assets/javascripts/notes/components/note_actions.vue
index d99694b06e9..394f2a80a67 100644
--- a/app/assets/javascripts/notes/components/note_actions.vue
+++ b/app/assets/javascripts/notes/components/note_actions.vue
@@ -2,11 +2,13 @@
 import { mapGetters } from 'vuex';
 import Icon from '~/vue_shared/components/icon.vue';
 import { GlLoadingIcon, GlTooltipDirective } from '@gitlab/ui';
+import ReplyButton from './note_actions/reply_button.vue';
 
 export default {
   name: 'NoteActions',
   components: {
     Icon,
+    ReplyButton,
     GlLoadingIcon,
   },
   directives: {
@@ -21,6 +23,11 @@ export default {
       type: [String, Number],
       required: true,
     },
+    discussionId: {
+      type: String,
+      required: false,
+      default: '',
+    },
     noteUrl: {
       type: String,
       required: false,
@@ -36,6 +43,10 @@ export default {
       required: false,
       default: null,
     },
+    showReply: {
+      type: Boolean,
+      required: true,
+    },
     canEdit: {
       type: Boolean,
       required: true,
@@ -80,6 +91,9 @@ export default {
   },
   computed: {
     ...mapGetters(['getUserDataByProp']),
+    showReplyButton() {
+      return gon.features && gon.features.replyToIndividualNotes && this.showReply;
+    },
     shouldShowActionsDropdown() {
       return this.currentUserId && (this.canEdit || this.canReportAsAbuse);
     },
@@ -153,6 +167,12 @@ export default {
         <icon css-classes="link-highlight award-control-icon-super-positive" name="emoji_smiley" />
       </a>
     </div>
+    <reply-button
+      v-if="showReplyButton"
+      ref="replyButton"
+      class="js-reply-button"
+      :note-id="discussionId"
+    />
     <div v-if="canEdit" class="note-actions-item">
       <button
         v-gl-tooltip.bottom
diff --git a/app/assets/javascripts/notes/components/note_actions/reply_button.vue b/app/assets/javascripts/notes/components/note_actions/reply_button.vue
new file mode 100644
index 00000000000..b2f9d7f128a
--- /dev/null
+++ b/app/assets/javascripts/notes/components/note_actions/reply_button.vue
@@ -0,0 +1,40 @@
+<script>
+import { mapActions } from 'vuex';
+import { GlTooltipDirective, GlButton } from '@gitlab/ui';
+import Icon from '~/vue_shared/components/icon.vue';
+
+export default {
+  name: 'ReplyButton',
+  components: {
+    Icon,
+    GlButton,
+  },
+  directives: {
+    GlTooltip: GlTooltipDirective,
+  },
+  props: {
+    noteId: {
+      type: String,
+      required: true,
+    },
+  },
+  methods: {
+    ...mapActions(['convertToDiscussion']),
+  },
+};
+</script>
+
+<template>
+  <div class="note-actions-item">
+    <gl-button
+      ref="button"
+      v-gl-tooltip.bottom
+      class="note-action-button"
+      variant="transparent"
+      :title="__('Reply to comment')"
+      @click="convertToDiscussion(noteId)"
+    >
+      <icon name="comment" css-classes="link-highlight" />
+    </gl-button>
+  </div>
+</template>
diff --git a/app/assets/javascripts/notes/components/noteable_discussion.vue b/app/assets/javascripts/notes/components/noteable_discussion.vue
index e26cce1c47f..b7e9f7c2028 100644
--- a/app/assets/javascripts/notes/components/noteable_discussion.vue
+++ b/app/assets/javascripts/notes/components/noteable_discussion.vue
@@ -398,6 +398,7 @@ Please check your network connection and try again.`;
                     :line="line"
                     :commit="commit"
                     :help-page-path="helpPagePath"
+                    :show-reply-button="canReply"
                     @handleDeleteNote="deleteNoteHandler"
                   >
                     <note-edited-text
diff --git a/app/assets/javascripts/notes/components/noteable_note.vue b/app/assets/javascripts/notes/components/noteable_note.vue
index 3c48d81ed05..56108a58010 100644
--- a/app/assets/javascripts/notes/components/noteable_note.vue
+++ b/app/assets/javascripts/notes/components/noteable_note.vue
@@ -29,6 +29,11 @@ export default {
       type: Object,
       required: true,
     },
+    discussion: {
+      type: Object,
+      required: false,
+      default: null,
+    },
     line: {
       type: Object,
       required: false,
@@ -54,7 +59,7 @@ export default {
     };
   },
   computed: {
-    ...mapGetters(['targetNoteHash', 'getNoteableData', 'getUserData']),
+    ...mapGetters(['targetNoteHash', 'getNoteableData', 'getUserData', 'commentsDisabled']),
     author() {
       return this.note.author;
     },
@@ -80,6 +85,19 @@ export default {
     isTarget() {
       return this.targetNoteHash === this.noteAnchorId;
     },
+    discussionId() {
+      if (this.discussion) {
+        return this.discussion.id;
+      }
+      return '';
+    },
+    showReplyButton() {
+      if (!this.discussion || !this.getNoteableData.current_user.can_create_note) {
+        return false;
+      }
+
+      return this.discussion.individual_note && !this.commentsDisabled;
+    },
     actionText() {
       if (!this.commit) {
         return '';
@@ -231,6 +249,7 @@ export default {
           :note-id="note.id"
           :note-url="note.noteable_note_url"
           :access-level="note.human_access"
+          :show-reply="showReplyButton"
           :can-edit="note.current_user.can_edit"
           :can-award-emoji="note.current_user.can_award_emoji"
           :can-delete="note.current_user.can_edit"
@@ -241,6 +260,7 @@ export default {
           :is-resolved="note.resolved"
           :is-resolving="isResolving"
           :resolved-by="note.resolved_by"
+          :discussion-id="discussionId"
           @handleEdit="editHandler"
           @handleDelete="deleteHandler"
           @handleResolve="resolveHandler"
diff --git a/app/assets/javascripts/notes/components/notes_app.vue b/app/assets/javascripts/notes/components/notes_app.vue
index 5edceea043c..6d72b72e628 100644
--- a/app/assets/javascripts/notes/components/notes_app.vue
+++ b/app/assets/javascripts/notes/components/notes_app.vue
@@ -199,7 +199,12 @@ export default {
             :key="discussion.id"
             :note="discussion.notes[0]"
           />
-          <noteable-note v-else :key="discussion.id" :note="discussion.notes[0]" />
+          <noteable-note
+            v-else
+            :key="discussion.id"
+            :note="discussion.notes[0]"
+            :discussion="discussion"
+          />
         </template>
         <noteable-discussion
           v-else
diff --git a/app/assets/javascripts/notes/stores/actions.js b/app/assets/javascripts/notes/stores/actions.js
index 2105a62cecb..ff65f14d529 100644
--- a/app/assets/javascripts/notes/stores/actions.js
+++ b/app/assets/javascripts/notes/stores/actions.js
@@ -426,5 +426,8 @@ export const submitSuggestion = (
     });
 };
 
+export const convertToDiscussion = ({ commit }, noteId) =>
+  commit(types.CONVERT_TO_DISCUSSION, noteId);
+
 // prevent babel-plugin-rewire from generating an invalid default during karma tests
 export default () => {};
diff --git a/app/assets/javascripts/notes/stores/mutation_types.js b/app/assets/javascripts/notes/stores/mutation_types.js
index df943c155f4..2bffedad336 100644
--- a/app/assets/javascripts/notes/stores/mutation_types.js
+++ b/app/assets/javascripts/notes/stores/mutation_types.js
@@ -17,6 +17,7 @@ export const SET_NOTES_FETCHED_STATE = 'SET_NOTES_FETCHED_STATE';
 export const SET_NOTES_LOADING_STATE = 'SET_NOTES_LOADING_STATE';
 export const DISABLE_COMMENTS = 'DISABLE_COMMENTS';
 export const APPLY_SUGGESTION = 'APPLY_SUGGESTION';
+export const CONVERT_TO_DISCUSSION = 'CONVERT_TO_DISCUSSION';
 
 // DISCUSSION
 export const COLLAPSE_DISCUSSION = 'COLLAPSE_DISCUSSION';
diff --git a/app/assets/javascripts/notes/stores/mutations.js b/app/assets/javascripts/notes/stores/mutations.js
index 33d39ad2ec9..d167f8ef421 100644
--- a/app/assets/javascripts/notes/stores/mutations.js
+++ b/app/assets/javascripts/notes/stores/mutations.js
@@ -264,4 +264,9 @@ export default {
     ).length;
     state.hasUnresolvedDiscussions = state.unresolvedDiscussionsCount > 1;
   },
+
+  [types.CONVERT_TO_DISCUSSION](state, discussionId) {
+    const discussion = utils.findNoteObjectById(state.discussions, discussionId);
+    Object.assign(discussion, { individual_note: false });
+  },
 };
diff --git a/app/controllers/concerns/issuable_actions.rb b/app/controllers/concerns/issuable_actions.rb
index 8ef3b6502df..cd3fa641e89 100644
--- a/app/controllers/concerns/issuable_actions.rb
+++ b/app/controllers/concerns/issuable_actions.rb
@@ -7,6 +7,9 @@ module IssuableActions
   included do
     before_action :authorize_destroy_issuable!, only: :destroy
     before_action :authorize_admin_issuable!, only: :bulk_update
+    before_action only: :show do
+      push_frontend_feature_flag(:reply_to_individual_notes)
+    end
   end
 
   def permitted_keys
diff --git a/app/models/concerns/noteable.rb b/app/models/concerns/noteable.rb
index 29476654bf7..3c74034b527 100644
--- a/app/models/concerns/noteable.rb
+++ b/app/models/concerns/noteable.rb
@@ -1,9 +1,18 @@
 # frozen_string_literal: true
 
 module Noteable
-  # Names of all implementers of `Noteable` that support resolvable notes.
+  extend ActiveSupport::Concern
+
+  # `Noteable` class names that support resolvable notes.
   RESOLVABLE_TYPES = %w(MergeRequest).freeze
 
+  class_methods do
+    # `Noteable` class names that support replying to individual notes.
+    def replyable_types
+      %w(Issue MergeRequest)
+    end
+  end
+
   def base_class_name
     self.class.base_class.name
   end
@@ -26,6 +35,10 @@ module Noteable
     DiscussionNote.noteable_types.include?(base_class_name)
   end
 
+  def supports_replying_to_individual_notes?
+    supports_discussions? && self.class.replyable_types.include?(base_class_name)
+  end
+
   def supports_suggestion?
     false
   end
diff --git a/app/models/discussion.rb b/app/models/discussion.rb
index dbc7b6e67be..f2678e0597d 100644
--- a/app/models/discussion.rb
+++ b/app/models/discussion.rb
@@ -17,6 +17,8 @@ class Discussion
             :for_commit?,
             :for_merge_request?,
 
+            :save,
+
             to: :first_note
 
   def project_id
@@ -116,6 +118,10 @@ class Discussion
     false
   end
 
+  def can_convert_to_discussion?
+    false
+  end
+
   def new_discussion?
     notes.length == 1
   end
diff --git a/app/models/individual_note_discussion.rb b/app/models/individual_note_discussion.rb
index 07ee7470ea2..aab0ff93468 100644
--- a/app/models/individual_note_discussion.rb
+++ b/app/models/individual_note_discussion.rb
@@ -13,6 +13,14 @@ class IndividualNoteDiscussion < Discussion
     true
   end
 
+  def can_convert_to_discussion?
+    noteable.supports_replying_to_individual_notes? && Feature.enabled?(:reply_to_individual_notes)
+  end
+
+  def convert_to_discussion!
+    first_note.becomes!(Discussion.note_class).to_discussion
+  end
+
   def reply_attributes
     super.tap { |attrs| attrs.delete(:discussion_id) }
   end
diff --git a/app/models/sent_notification.rb b/app/models/sent_notification.rb
index e65b3df0fb6..6caab24143b 100644
--- a/app/models/sent_notification.rb
+++ b/app/models/sent_notification.rb
@@ -48,7 +48,7 @@ class SentNotification < ActiveRecord::Base
     end
 
     def record_note(note, recipient_id, reply_key = self.reply_key, attrs = {})
-      attrs[:in_reply_to_discussion_id] = note.discussion_id
+      attrs[:in_reply_to_discussion_id] = note.discussion_id if note.part_of_discussion?
 
       record(note.noteable, recipient_id, reply_key, attrs)
     end
@@ -99,29 +99,12 @@ class SentNotification < ActiveRecord::Base
   private
 
   def reply_params
-    attrs = {
+    {
       noteable_type: self.noteable_type,
       noteable_id: self.noteable_id,
-      commit_id: self.commit_id
+      commit_id: self.commit_id,
+      in_reply_to_discussion_id: self.in_reply_to_discussion_id
     }
-
-    if self.in_reply_to_discussion_id.present?
-      attrs[:in_reply_to_discussion_id] = self.in_reply_to_discussion_id
-    else
-      # Remove in GitLab 10.0, when we will not support replying to SentNotifications
-      # that don't have `in_reply_to_discussion_id` anymore.
-      attrs.merge!(
-        type: self.note_type,
-
-        # LegacyDiffNote
-        line_code: self.line_code,
-
-        # DiffNote
-        position: self.position.to_json
-      )
-    end
-
-    attrs
   end
 
   def note_valid
diff --git a/app/services/notes/build_service.rb b/app/services/notes/build_service.rb
index bae98ede561..541f3e0d23c 100644
--- a/app/services/notes/build_service.rb
+++ b/app/services/notes/build_service.rb
@@ -15,6 +15,8 @@ module Notes
           return note
         end
 
+        discussion = discussion.convert_to_discussion! if discussion.can_convert_to_discussion?
+
         params.merge!(discussion.reply_attributes)
         should_resolve = discussion.resolved?
       end
diff --git a/app/services/notes/create_service.rb b/app/services/notes/create_service.rb
index c4546f30235..b975c3a8cb6 100644
--- a/app/services/notes/create_service.rb
+++ b/app/services/notes/create_service.rb
@@ -34,6 +34,10 @@ module Notes
       end
 
       if !only_commands && note.save
+        if note.part_of_discussion? && note.discussion.can_convert_to_discussion?
+          note.discussion.convert_to_discussion!.save(touch: false)
+        end
+
         todo_service.new_note(note, current_user)
         clear_noteable_diffs_cache(note)
         Suggestions::CreateService.new(note).execute