Fix js paths on board service to use absolute URL

app/assets/javascripts/boards/services/board_service.js

@@ -7,7 +7,7 @@ class BoardService {
     this.boards = Vue.resource(`${boardsEndpoint}{/id}.json`, {}, {
       issues: {
         method: 'GET',
-        url: `/boards/${boardId}/issues.json`,
+        url: gon.gitlab_url + `/boards/${boardId}/issues.json`,
       }
     });
     this.lists = Vue.resource(`${listsEndpoint}{/id}`, {}, {
@@ -16,7 +16,7 @@ class BoardService {
         url: `${listsEndpoint}/generate.json`
       }
     });
-    this.issue = Vue.resource(`/boards/${boardId}/issues{/id}`, {});
+    this.issue = Vue.resource(gon.gitlab_url + `/boards/${boardId}/issues{/id}`, {});
     this.issues = Vue.resource(`${listsEndpoint}{/id}/issues`, {}, {
       bulkUpdate: {
         method: 'POST',

app/controllers/projects/boards_controller.rb

@@ -21,7 +21,7 @@ class Projects::BoardsController < Projects::ApplicationController
   private
 
   def assign_endpoint_vars
-    @boards_endpoint = project_boards_path(project)
+    @boards_endpoint = project_boards_url(project)
     @bulk_issues_path = bulk_update_project_issues_path(project)
     @namespace_path = project.namespace.path
     @labels_endpoint = project_labels_path(project)

app/helpers/boards_helper.rb

@@ -8,7 +8,7 @@ module BoardsHelper
   def board_data
     {
       boards_endpoint: @boards_endpoint,
-      lists_endpoint: board_lists_path(board),
+      lists_endpoint: board_lists_url(board),
       board_id: board.id,
       board_milestone_title: board&.milestone&.title,
       disabled: "#{!can?(current_user, :admin_list, current_board_parent)}",

ee/app/controllers/groups/boards_controller.rb

@@ -18,8 +18,8 @@ class Groups::BoardsController < Groups::ApplicationController
   end
 
   def assign_endpoint_vars
-    @boards_endpoint = group_boards_path(group)
+    @boards_endpoint = group_boards_url(group)
     @namespace_path = group.to_param
-    @labels_endpoint = group_labels_path(group)
+    @labels_endpoint = group_labels_url(group)
   end
 end