Include the Issue#assignee in the response when listing issues

app/controllers/projects/board_issues_controller.rb

@@ -7,7 +7,12 @@ class Projects::BoardIssuesController < Projects::ApplicationController
     issues = Boards::Issues::ListService.new(project, current_user, filter_params).execute
     issues = issues.page(params[:page])
 
-    render json: issues.as_json(only: [:iid, :title, :confidential], include: { labels: { only: [:id, :title, :color] } })
+    render json: issues.as_json(
+      only: [:iid, :title, :confidential],
+      include: {
+        assignee: { only: [:id, :name, :username], methods: [:avatar_url] },
+        labels:   { only: [:id, :title, :color] }
+      })
   end
 
   def update

spec/controllers/projects/board_issues_controller_spec.rb

@@ -18,9 +18,10 @@ describe Projects::BoardIssuesController do
   describe 'GET #index' do
     context 'with valid list id' do
       it 'returns issues that have the list label applied' do
+        johndoe = create(:user, avatar: fixture_file_upload(File.join(Rails.root, 'spec/fixtures/dk.png')))
         create(:labeled_issue, project: project, labels: [planning])
         create(:labeled_issue, project: project, labels: [development])
-        create(:labeled_issue, project: project, labels: [development])
+        create(:labeled_issue, project: project, labels: [development], assignee: johndoe)
 
         list_issues list_id: list2
 

spec/fixtures/api/schemas/issue.json

@@ -24,6 +24,12 @@
         },
         "title": { "type": "string" }
       }
+    },
+    "assignee": {
+      "id": { "type": "integet" },
+      "name": { "type": "string" },
+      "username": { "type": "string" },
+      "avatar_url": { "type": "uri" }
     }
   },
   "additionalProperties": false