Add iid, epic_issue_id & group_id to sidebar

Expose `iid`, `epic_issue_id` & `group_id` for Issuable
sidebar

doc/api/epics.md

@@ -65,6 +65,8 @@ Example response:
   "title": "Accusamus iste et ullam ratione voluptatem omnis debitis dolor est.",
   "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/4",
+  "reference": "&4",
   "author": {
     "id": 10,
     "name": "Lu Mayer",
@@ -118,6 +120,8 @@ Example response:
   "title": "Ea cupiditate dolores ut vero consequatur quasi veniam voluptatem et non.",
   "description": "Molestias dolorem eos vitae expedita impedit necessitatibus quo voluptatum.",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/5",
+  "reference": "&5",
   "author":{
     "id": 7,
     "name": "Pamella Huel",
@@ -182,6 +186,8 @@ Example response:
   "title": "Epic",
   "description": "Epic description",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/6",
+  "reference": "&6",
   "author": {
     "name" : "Alexandra Bashirian",
     "avatar_url" : null,
@@ -247,6 +253,8 @@ Example response:
   "title": "New Title",
   "description": "Epic description",
   "state": "opened",
+  "web_edit_url": "http://localhost:3001/groups/test/-/epics/6",
+  "reference": "&6",
   "author": {
     "name" : "Alexandra Bashirian",
     "avatar_url" : null,

ee/app/serializers/ee/issue_sidebar_extras_entity.rb

@@ -5,7 +5,12 @@ module EE
     extend ActiveSupport::Concern
 
     prepended do
-      expose :epic, using: EpicBaseEntity
+      expose :epic do
+        expose :epic, merge: true, using: EpicBaseEntity
+        expose :epic_issue_id do |issuable|
+          issuable.epic_issue&.id
+        end
+      end
       expose :weight
     end
   end

ee/app/serializers/epic_base_entity.rb

@@ -5,10 +5,12 @@ class EpicBaseEntity < Grape::Entity
   include EntityDateHelper
 
   expose :id
+  expose :iid
   expose :title
   expose :url do |epic|
     group_epic_path(epic.group, epic)
   end
+  expose :group_id
   expose :human_readable_end_date, if: -> (epic, _) { epic.end_date.present? } do |epic|
     epic.end_date&.to_s(:medium)
   end

ee/app/views/shared/issuable/_sidebar_item_epic.haml

 - if issuable_sidebar[:supports_epic]
   - if issuable_sidebar[:features_available][:epics]
-    .block.epic
-      #js-vue-sidebar-item-epic
-        .title.hide-collapsed
-          Epic
-          = icon('spinner spin')
+    - if cookies[:epics_select_dropdown] == 'true'
+      #js-vue-sidebar-item-epics-select{ data: { can_edit: can_admin_issue?.to_s, group_id: @project.group.id, issue_id: @issuable.id, epic_issue_id: @issuable.epic_issue&.id } }
+    - else
+      .block.epic
+        #js-vue-sidebar-item-epic
+          .title.hide-collapsed
+            Epic
+            = icon('spinner spin')
+
   - else
     = render 'shared/promotions/promote_epics'

ee/lib/ee/api/entities.rb

@@ -260,11 +260,11 @@ module EE
         expose :due_date_is_fixed?, as: :due_date_is_fixed, if: can_admin_epic
         expose :due_date_fixed, :due_date_from_milestones, if: can_admin_epic
         expose :state
-        expose :web_edit_url do |epic|
+        expose :web_edit_url, if: can_admin_epic do |epic|
           ::Gitlab::Routing.url_helpers.group_epic_path(epic.group, epic)
         end
-        expose :reference do |epic|
-          epic.to_reference(epic.parent&.group)
+        expose :reference, if: { with_reference: true } do |epic|
+          epic.to_reference(full: true)
         end
         expose :created_at
         expose :updated_at
@@ -298,7 +298,9 @@ module EE
       class EpicIssueLink < Grape::Entity
         expose :id
         expose :relative_position
-        expose :epic, using: EE::API::Entities::Epic
+        expose :epic do |epic_issue_link, _options|
+          ::EE::API::Entities::Epic.represent(epic_issue_link.epic, with_reference: true)
+        end
         expose :issue, using: ::API::Entities::IssueBasic
       end
 

ee/spec/fixtures/api/schemas/entities/issue_sidebar_extras.json

@@ -8,7 +8,8 @@
           "properties": {
             "id": { "type": "integer" },
             "title": { "type": "string" },
-            "url": { "type": "string" }
+            "url": { "type": "string" },
+            "epic_issue_id": { "type":  ["integer", "null"] }
           }
         },
         "weight": { "type": ["integer", "null"] }