Fix labels finder to filter issuables

Use project scopes to filter project labels that are visible for user

2 files changed, 11 insertions, 5 deletions

diff --git a/app/finders/labels_finder.rb b/app/finders/labels_finder.rb
index e523942ea4c..027cdc4fc78 100644
--- a/app/finders/labels_finder.rb
+++ b/app/finders/labels_finder.rb
@@ -51,7 +51,7 @@ class LabelsFinder < UnionFinder
       end
 
       label_ids << Label.where(group_id: projects.group_ids)
-      label_ids << Label.where(project_id: projects.select(:id)) unless only_group_labels?
+      label_ids << Label.where(project_id: ids_user_can_read_labels(projects)) unless only_group_labels?
     end
 
     label_ids
@@ -188,4 +188,10 @@ class LabelsFinder < UnionFinder
       groups.select { |group| authorized_to_read_labels?(group) }
     end
   end
+
+  # rubocop: disable CodeReuse/ActiveRecord
+  def ids_user_can_read_labels(projects)
+    Project.where(id: projects.select(:id)).ids_with_issuables_available_for(current_user)
+  end
+  # rubocop: enable CodeReuse/ActiveRecord
 end
diff --git a/app/models/project.rb b/app/models/project.rb
index 3525f37f8d5..1aecf3ef6ab 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -609,11 +609,11 @@ class Project < ApplicationRecord
       joins(:namespace).where(namespaces: { type: 'Group' }).select(:namespace_id)
     end
 
-    # Returns ids of projects with milestones available for given user
+    # Returns ids of projects with issuables available for given user
     #
-    # Used on queries to find milestones which user can see
-    # For example: Milestone.where(project_id: ids_with_milestone_available_for(user))
-    def ids_with_milestone_available_for(user)
+    # Used on queries to find milestones or labels which user can see
+    # For example: Milestone.where(project_id: ids_with_issuables_available_for(user))
+    def ids_with_issuables_available_for(user)
       with_issues_enabled = with_issues_available_for_user(user).select(:id)
       with_merge_requests_enabled = with_merge_requests_available_for_user(user).select(:id)