Expose issue updated by on GraphQL

Add updatedBy field on IssueType

app/graphql/types/issue_type.rb

@@ -41,6 +41,9 @@ module Types
     field :assignees, Types::UserType.connection_type, null: true,
           description: 'Assignees of the issue'
 
+    field :updated_by, Types::UserType, null: true,
+          description: 'User that last updated the issue'
+
     field :labels, Types::LabelType.connection_type, null: true,
           description: 'Labels of the issue'
     field :milestone, Types::MilestoneType, null: true,
@@ -114,6 +117,10 @@ module Types
       Gitlab::Graphql::Loaders::BatchModelLoader.new(User, object.author_id).find
     end
 
+    def updated_by
+      Gitlab::Graphql::Loaders::BatchModelLoader.new(User, object.updated_by_id).find
+    end
+
     def milestone
       Gitlab::Graphql::Loaders::BatchModelLoader.new(Milestone, object.milestone_id).find
     end

changelogs/unreleased/issue_233479-add_updated_by_for_issue_type.yml

+---
+title: Expose issue updated by on GraphQL
+merge_request: 46015
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -7214,6 +7214,11 @@ type EpicIssue implements CurrentUserTodos & Noteable {
   """
   updatedAt: Time!
 
+  """
+  User that last updated the issue
+  """
+  updatedBy: User
+
   """
   Number of upvotes the issue has received
   """
@@ -9467,6 +9472,11 @@ type Issue implements CurrentUserTodos & Noteable {
   """
   updatedAt: Time!
 
+  """
+  User that last updated the issue
+  """
+  updatedBy: User
+
   """
   Number of upvotes the issue has received
   """

doc/api/graphql/reference/gitlab_schema.json

@@ -19865,6 +19865,20 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "updatedBy",
+              "description": "User that last updated the issue",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "User",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "upvotes",
               "description": "Number of upvotes the issue has received",
@@ -25765,6 +25779,20 @@
               "isDeprecated": false,
               "deprecationReason": null
             },
+            {
+              "name": "updatedBy",
+              "description": "User that last updated the issue",
+              "args": [
+
+              ],
+              "type": {
+                "kind": "OBJECT",
+                "name": "User",
+                "ofType": null
+              },
+              "isDeprecated": false,
+              "deprecationReason": null
+            },
             {
               "name": "upvotes",
               "description": "Number of upvotes the issue has received",

doc/api/graphql/reference/index.md

@@ -1149,6 +1149,7 @@ Relationship between an epic and an issue.
 | `totalTimeSpent` | Int! | Total time reported as spent on the issue |
 | `type` | IssueType | Type of the issue |
 | `updatedAt` | Time! | Timestamp of when the issue was last updated |
+| `updatedBy` | User | User that last updated the issue |
 | `upvotes` | Int! | Number of upvotes the issue has received |
 | `userNotesCount` | Int! | Number of user notes of the issue |
 | `userPermissions` | IssuePermissions! | Permissions for the current user on the resource |
@@ -1342,6 +1343,7 @@ Represents a recorded measurement (object count) for the Admins.
 | `totalTimeSpent` | Int! | Total time reported as spent on the issue |
 | `type` | IssueType | Type of the issue |
 | `updatedAt` | Time! | Timestamp of when the issue was last updated |
+| `updatedBy` | User | User that last updated the issue |
 | `upvotes` | Int! | Number of upvotes the issue has received |
 | `userNotesCount` | Int! | Number of user notes of the issue |
 | `userPermissions` | IssuePermissions! | Permissions for the current user on the resource |

spec/graphql/types/issue_type_spec.rb

@@ -14,7 +14,7 @@ RSpec.describe GitlabSchema.types['Issue'] do
   specify { expect(described_class.interfaces).to include(Types::CurrentUserTodos) }
 
   it 'has specific fields' do
-    fields = %i[id iid title description state reference author assignees participants labels milestone due_date
+    fields = %i[id iid title description state reference author assignees updated_by participants labels milestone due_date
                 confidential discussion_locked upvotes downvotes user_notes_count web_path web_url relative_position
                 subscribed time_estimate total_time_spent human_time_estimate human_total_time_spent closed_at created_at updated_at task_completion_status
                 designs design_collection alert_management_alert severity current_user_todos]

spec/requests/api/graphql/issue/issue_spec.rb

@@ -71,14 +71,15 @@ RSpec.describe 'Query.issue(id)' do
     end
 
     context 'selecting multiple fields' do
-      let(:issue_fields) { %w(title description) }
+      let(:issue_fields) { ['title', 'description', 'updatedBy { username }'] }
 
       it 'returns the Issue with the specified fields' do
         post_graphql(query, current_user: current_user)
 
-        expect(issue_data.keys).to eq( %w(title description) )
+        expect(issue_data.keys).to eq( %w(title description updatedBy) )
         expect(issue_data['title']).to eq(issue.title)
         expect(issue_data['description']).to eq(issue.description)
+        expect(issue_data['updatedBy']['username']).to eq(issue.author.username)
       end
     end