Add EE specific IssueBoardEntity

app/serializers/issue_board_entity.rb

@@ -2,6 +2,7 @@
 
 class IssueBoardEntity < Grape::Entity
   include RequestAwareEntity
+  prepend ::EE::IssueBoardEntity
 
   expose :id
   expose :iid
@@ -11,7 +12,6 @@ class IssueBoardEntity < Grape::Entity
   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]

ee/app/serializers/ee/issue_board_entity.rb

+# frozen_string_literal: true
+module EE
+  module IssueBoardEntity
+    extend ActiveSupport::Concern
+
+    prepended do
+      expose :weight, if: ->(issue, _) { issue.supports_weight? }
+    end
+  end
+end

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

@@ -9,7 +9,7 @@
     "project_id": { "type": "integer" },
     "relative_position": { "type": ["integer", "null"] },
     "time_estimate": { "type": "integer" },
-    "weight": { "type": "integer" },
+    "weight": { "type": ["integer", "null"] },
     "project": {
       "type": "object",
       "properties": {

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

@@ -2,14 +2,16 @@
   "type": "object",
   "required" : [
     "issues",
-    "size"
+    "size",
+    "total_weight"
   ],
   "properties" : {
     "issues": {
       "type": "array",
       "items": { "$ref": "issue_board.json" }
     },
-    "size": { "type": "integer" }
+    "size": { "type": "integer" },
+    "total_weight": { "type": "integer" }
   },
   "additionalProperties": false
 }