Extract code into IssueBoardEntity

app/controllers/boards/issues_controller.rb

@@ -100,18 +100,12 @@ module Boards
         .merge(board_id: params[:board_id], list_id: params[:list_id], request: request)
     end
+    def serializer
+      IssueSerializer.new(current_user: current_user)
+    end
+
     def serialize_as_json(resource)
-      resource.as_json(
-        only: [:id, :iid, :project_id, :title, :confidential, :due_date, :relative_position, :weight],
-        labels: true,
-        issue_endpoints: true,
-        include_full_project_path: board.group_board?,
-        include: {
-          project: { only: [:id, :path] },
-          assignees: { only: [:id, :name, :username], methods: [:avatar_url] },
-          milestone: { only: [:id, :title] }
-        }
-      )
+      serializer.represent(resource, serializer: 'board', include_full_project_path: board.group_board?)
     end
     def whitelist_query_limiting

app/models/issue.rb

@@ -235,20 +235,6 @@ class Issue < ActiveRecord::Base
   def as_json(options = {})
     super(options).tap do |json|
-      if options.key?(:issue_endpoints) && project
-        url_helper = Gitlab::Routing.url_helpers
-
-        issue_reference = options[:include_full_project_path] ? to_reference(full: true) : to_reference
-
-        json.merge!(
-          reference_path: issue_reference,
-          real_path: url_helper.project_issue_path(project, self),
-          issue_sidebar_endpoint: url_helper.project_issue_path(project, self, format: :json, serializer: 'sidebar'),
-          toggle_subscription_endpoint: url_helper.toggle_subscription_project_issue_path(project, self),
-          assignable_labels_endpoint: url_helper.project_labels_path(project, format: :json, include_ancestor_groups: true)
-        )
-      end
-
       if options.key?(:labels)
         json[:labels] = labels.as_json(
           project: project,

app/serializers/README.md

@@ -180,7 +180,7 @@ def index
     render json: MyResourceSerializer
       .new(current_user: @current_user)
       .represent_details(@project.resources)
-  nd
+  end
 end
 ```
@@ -196,7 +196,7 @@ def index
         .represent_details(@project.resources),
       count: @project.resources.count
     }
-  nd
+  end
 end
 ```

app/serializers/issue_board_entity.rb

+# frozen_string_literal: true
+
+class IssueBoardEntity < Grape::Entity
+  include RequestAwareEntity
+
+  expose :id
+  expose :iid
+  expose :title
+
+  expose :confidential
+  expose :due_date
+  expose :project_id
+  expose :relative_position
+  expose :weight, if: -> (*) { respond_to?(:weight) }
+
+  expose :project do |issue|
+    API::Entities::Project.represent issue.project, only: [:id, :path]
+  end
+
+  expose :milestone, expose_nil: false do |issue|
+    API::Entities::Project.represent issue.milestone, only: [:id, :title]
+  end
+
+  expose :assignees do |issue|
+    API::Entities::UserBasic.represent issue.assignees, only: [:id, :name, :username, :avatar_url]
+  end
+
+  expose :labels do |issue|
+    LabelEntity.represent issue.labels, project: issue.project, only: [:id, :title, :description, :color, :priority, :text_color]
+  end
+
+  expose :reference_path, if: -> (issue) { issue.project } do |issue, options|
+    options[:include_full_project_path] ? issue.to_reference(full: true) : issue.to_reference
+  end
+
+  expose :real_path, if: -> (issue) { issue.project } do |issue|
+    project_issue_path(issue.project, issue)
+  end
+
+  expose :issue_sidebar_endpoint, if: -> (issue) { issue.project } do |issue|
+    project_issue_path(issue.project, issue, format: :json, serializer: 'sidebar')
+  end
+
+  expose :toggle_subscription_endpoint, if: -> (issue) { issue.project } do |issue|
+    toggle_subscription_project_issue_path(issue.project, issue)
+  end
+
+  expose :assignable_labels_endpoint, if: -> (issue) { issue.project } do |issue|
+    project_labels_path(issue.project, format: :json, include_ancestor_groups: true)
+  end
+end

app/serializers/issue_serializer.rb

@@ -4,15 +4,17 @@ class IssueSerializer < BaseSerializer
   # This overrided method takes care of which entity should be used
   # to serialize the `issue` based on `basic` key in `opts` param.
   # Hence, `entity` doesn't need to be declared on the class scope.
-  def represent(merge_request, opts = {})
+  def represent(issue, opts = {})
     entity =
       case opts[:serializer]
       when 'sidebar'
         IssueSidebarEntity
+      when 'board'
+        IssueBoardEntity
       else
         IssueEntity
       end
-    super(merge_request, opts, entity)
+    super(issue, opts, entity)
   end
 end

app/serializers/label_entity.rb

@@ -12,4 +12,8 @@ class LabelEntity < Grape::Entity
   expose :text_color
   expose :created_at
   expose :updated_at
+
+  expose :priority, if: -> (*) { options.key?(:project) } do |label|
+    label.priority(options[:project])
+  end
 end

spec/controllers/boards/issues_controller_spec.rb

@@ -50,7 +50,7 @@ describe Boards::IssuesController do
           parsed_response = JSON.parse(response.body)
-          expect(response).to match_response_schema('issues')
+          expect(response).to match_response_schema('entities/issue_boards')
           expect(parsed_response['issues'].length).to eq 2
           expect(development.issues.map(&:relative_position)).not_to include(nil)
         end
@@ -121,7 +121,7 @@ describe Boards::IssuesController do
         parsed_response = JSON.parse(response.body)
-        expect(response).to match_response_schema('issues')
+        expect(response).to match_response_schema('entities/issue_boards')
         expect(parsed_response['issues'].length).to eq 2
       end
     end
@@ -168,7 +168,7 @@ describe Boards::IssuesController do
       it 'returns the created issue' do
         create_issue user: user, board: board, list: list1, title: 'New issue'
-        expect(response).to match_response_schema('issue')
+        expect(response).to match_response_schema('entities/issue_board')
       end
     end

spec/fixtures/api/schemas/entities/issue_boards.json

+{
+  "type": "object",
+  "required" : [
+    "issues",
+    "size"
+  ],
+  "properties" : {
+    "issues": {
+      "type": "array",
+      "items": { "$ref": "issue_board.json" }
+    },
+    "size": { "type": "integer" }
+  },
+  "additionalProperties": false
+}

spec/serializers/issue_board_entity_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe IssueBoardEntity do
+  let(:project)  { create(:project) }
+  let(:resource) { create(:issue, project: project) }
+  let(:user)     { create(:user) }
+
+  let(:request) { double('request', current_user: user) }
+
+  subject { described_class.new(resource, request: request).as_json }
+
+  it 'has basic attributes' do
+    expect(subject).to include(:id, :iid, :title, :confidential, :due_date, :project_id, :relative_position,
+                               :project, :labels)
+  end
+
+  it 'has path and endpoints' do
+    expect(subject).to include(:reference_path, :real_path, :issue_sidebar_endpoint,
+                               :toggle_subscription_endpoint, :assignable_labels_endpoint)
+  end
+end

spec/serializers/issue_serializer_spec.rb

@@ -24,4 +24,12 @@ describe IssueSerializer do
       expect(json_entity).to match_schema('entities/issue_sidebar')
     end
   end
+
+  context 'board issue serialization' do
+    let(:serializer) { 'board' }
+
+    it 'matches board issue json schema' do
+      expect(json_entity).to match_schema('entities/issue_board')
+    end
+  end
 end