Disable subscribing to group-level labels

app/assets/stylesheets/pages/labels.scss

@@ -223,6 +223,13 @@
 }
 
 .label-subscribe-button {
+  .label-subscribe-button-icon {
+    &[disabled] {
+      opacity: 0.5;
+      pointer-events: none;
+    }
+  }
+
   .label-subscribe-button-loading {
     display: none;
   }

app/controllers/groups/labels_controller.rb

 class Groups::LabelsController < Groups::ApplicationController
-  include ToggleSubscriptionAction
-
-  before_action :label, only: [:edit, :update, :destroy, :toggle_subscription]
+  before_action :label, only: [:edit, :update, :destroy]
   before_action :authorize_admin_labels!, only: [:new, :create, :edit, :update, :destroy]
   before_action :save_previous_label_path, only: [:edit]
 
@@ -71,7 +69,6 @@ class Groups::LabelsController < Groups::ApplicationController
   def label
     @label ||= @group.labels.find(params[:id])
   end
-  alias_method :subscribable_resource, :label
 
   def label_params
     params.require(:label).permit(:title, :description, :color)

app/helpers/labels_helper.rb

@@ -68,11 +68,12 @@ module LabelsHelper
     end
   end
 
-  def toggle_subscription_label_path(label)
-    case label
-    when GroupLabel then toggle_subscription_group_label_path(label.group, label)
-    when ProjectLabel then toggle_subscription_namespace_project_label_path(label.project.namespace, label.project, label)
-    end
+  def toggle_subscription_data(label)
+    return unless label.is_a?(ProjectLabel)
+
+    {
+      url: toggle_subscription_namespace_project_label_path(label.project.namespace, label.project, label)
+    }
   end
 
   def render_colored_label(label, label_suffix = '', tooltip: true)
@@ -148,11 +149,17 @@ module LabelsHelper
   end
 
   def label_subscription_status(label)
-    label.subscribed?(current_user) ? 'subscribed' : 'unsubscribed'
+    case label
+    when GroupLabel then 'Subscribing to group labels is currently not supported.'
+    when ProjectLabel then label.subscribed?(current_user) ? 'subscribed' : 'unsubscribed'
+    end
   end
 
   def label_subscription_toggle_button_text(label)
-    label.subscribed?(current_user) ? 'Unsubscribe' : 'Subscribe'
+    case label
+    when GroupLabel then 'Subscribing to group labels is currently not supported.'
+    when ProjectLabel then label.subscribed?(current_user) ? 'Unsubscribe' : 'Subscribe'
+    end
   end
 
   def label_deletion_confirm_text(label)

app/views/shared/_label.html.haml

@@ -18,7 +18,7 @@
           = link_to_label(label, subject: @project) do
             = pluralize open_issues_count, 'open issue'
         - if current_user
-          %li.label-subscription{ data: { url: toggle_subscription_label_path(label) } }
+          %li.label-subscription{ data: toggle_subscription_data(label) }
             %a.js-subscribe-button.label-subscribe-button.subscription-status{ role: "button", href: "#", data: { toggle: "tooltip", status: label_subscription_status(label) } }
               %span= label_subscription_toggle_button_text(label)
         - if can?(current_user, :admin_label, label)
@@ -34,10 +34,10 @@
       = pluralize open_issues_count, 'open issue'
 
     - if current_user
-      .label-subscription.inline{ data: { url: toggle_subscription_label_path(label) } }
+      .label-subscription.inline{ data: toggle_subscription_data(label) }
         %button.js-subscribe-button.label-subscribe-button.btn.btn-transparent.btn-action.subscription-status{ type: "button", title: label_subscription_toggle_button_text(label), data: { toggle: "tooltip", status: label_subscription_status(label) } }
           %span.sr-only= label_subscription_toggle_button_text(label)
-          = icon('eye', class: 'label-subscribe-button-icon')
+          = icon('eye', class: 'label-subscribe-button-icon', disabled: label.is_a?(GroupLabel))
           = icon('spinner spin', class: 'label-subscribe-button-loading')
 
     - if can?(current_user, :admin_label, label)
@@ -48,6 +48,6 @@
         %span.sr-only Delete
         = icon('trash-o')
 
-  - if current_user
+  - if current_user && label.is_a?(ProjectLabel)
     :javascript
       new Subscription('##{dom_id(label)} .label-subscription');

config/routes/group.rb

@@ -29,10 +29,6 @@ resources :groups, constraints: { id: /[a-zA-Z.0-9_\-]+(?<!\.atom)/ }  do
     resource :avatar, only: [:destroy]
     resources :milestones, constraints: { id: /[^\/]+/ }, only: [:index, :show, :update, :new, :create]
 
-    resources :labels, except: [:show], constraints: { id: /\d+/ } do
-      member do
-        post :toggle_subscription
-      end
-    end
+    resources :labels, except: [:show], constraints: { id: /\d+/ }
   end
 end