add Member#notifiable?(type, opts)

app/models/member.rb

@@ -332,4 +332,8 @@ class Member < ActiveRecord::Base
   def notification_service
     NotificationService.new
   end
+
+  def notifiable?(type, opts={})
+    raise 'abstract'
+  end
 end

app/models/members/group_member.rb

@@ -30,6 +30,10 @@ class GroupMember < Member
     'Group'
   end
+  def notifiable?(type, opts={})
+    NotificationRecipientService.notifiable?(user, type, { group: group }.merge(opts))
+  end
+
   private
   def send_invite

app/models/members/project_member.rb

@@ -87,6 +87,10 @@ class ProjectMember < Member
     project.owner == user
   end
+  def notifiable?(type, opts={})
+    NotificationRecipientService.notifiable?(user, type, { project: project }.merge(opts))
+  end
+
   private
   def delete_member_todos