Improve boards validation code and fix sidebar resources

app/helpers/labels_helper.rb

@@ -127,7 +127,8 @@ module LabelsHelper
     if project
       project_labels_path(project, :json)
     elsif @group
-      group_labels_path(@group, :json, only_group_labels: only_group_labels)
+      options = { only_group_labels: only_group_labels } if only_group_labels
+      group_labels_path(@group, :json, options)
     else
       dashboard_labels_path(:json)
     end

app/models/board.rb

@@ -7,7 +7,11 @@ class Board < ActiveRecord::Base
 
   validates :name, presence: true
 
-  validates :project, presence: true, if: -> { respond_to?(:group_id) && !group }
+  validates :project, presence: true, if: :project_needed?
+
+  def project_needed?
+    true
+  end
 
   def backlog_list
     lists.merge(List.backlog).take

app/views/shared/boards/components/sidebar/_labels.html.haml

@@ -24,7 +24,7 @@
             show_no: "true",
             show_any: "true",
             project_id: @project&.try(:id),
-            labels: labels_filter_path(true),
+            labels: labels_filter_path(false),
             namespace_path: @project.try(:namespace).try(:full_path),
             project_path: @project.try(:path) },
           ":data-issue-update" => "'#{build_issue_link_base}/' + issue.iid + '.json'" }

app/views/shared/boards/components/sidebar/_milestone.html.haml

-- milestone_filter_opts = { format: :json }
-- milestone_filter_opts = milestone_filter_opts.merge(only_group_milestones: true) if board.group_board?
-
 .block.milestone
   .title
     Milestone
@@ -19,7 +16,7 @@
         name: "issue[milestone_id]",
         "v-if" => "issue.milestone" }
       .dropdown
-        %button.dropdown-menu-toggle.js-milestone-select.js-issue-board-sidebar{ type: "button", data: { toggle: "dropdown", show_no: "true", field_name: "issue[milestone_id]", milestones: milestones_filter_path(milestone_filter_opts), ability_name: "issue", use_id: "true", default_no: "true" },
+        %button.dropdown-menu-toggle.js-milestone-select.js-issue-board-sidebar{ type: "button", data: { toggle: "dropdown", show_no: "true", field_name: "issue[milestone_id]", milestones: milestones_filter_path(format: :json), ability_name: "issue", use_id: "true", default_no: "true" },
           ":data-selected" => "milestoneTitle",
           ":data-issuable-id" => "issue.iid",
           ":data-issue-update" => "'#{build_issue_link_base}/' + issue.iid + '.json'" }

ee/app/models/ee/board.rb

@@ -9,6 +9,10 @@ module EE
       validates :group, presence: true, unless: :project
     end
 
+    def project_needed?
+      !group
+    end
+
     def milestone
       return nil unless parent.feature_available?(:issue_board_milestone)