Add subscribable_project to ToggleSubscriptionAction concern

app/controllers/concerns/toggle_subscription_action.rb

@@ -4,13 +4,17 @@ module ToggleSubscriptionAction
   def toggle_subscription
     return unless current_user
 
-    subscribable_resource.toggle_subscription(current_user)
+    subscribable_resource.toggle_subscription(current_user, subscribable_project)
 
     head :ok
   end
 
   private
 
+  def subscribable_project
+    raise NotImplementedError
+  end
+
   def subscribable_resource
     raise NotImplementedError
   end

app/controllers/projects/issues_controller.rb

@@ -169,6 +169,10 @@ class Projects::IssuesController < Projects::ApplicationController
   alias_method :awardable, :issue
   alias_method :spammable, :issue
 
+  def subscribable_project
+    issue.project
+  end
+
   def authorize_read_issue!
     return render_404 unless can?(current_user, :read_issue, @issue)
   end

app/controllers/projects/labels_controller.rb

@@ -125,6 +125,10 @@ class Projects::LabelsController < Projects::ApplicationController
   end
   alias_method :subscribable_resource, :label
 
+  def subscribable_project
+    @project
+  end
+
   def find_labels
     @available_labels ||= LabelsFinder.new(current_user, project_id: @project.id).execute
   end

app/controllers/projects/merge_requests_controller.rb

@@ -473,6 +473,10 @@ class Projects::MergeRequestsController < Projects::ApplicationController
   alias_method :issuable, :merge_request
   alias_method :awardable, :merge_request
 
+  def subscribable_project
+    merge_request.project
+  end
+
   def authorize_update_merge_request!
     return render_404 unless can?(current_user, :update_merge_request, @merge_request)
   end