Prevent questions being sent to users that lock their inbox

app/workers/question_worker.rb

@@ -12,6 +12,7 @@ class QuestionWorker
     question = Question.find(question_id)
 
     user.followers.each do |f|
+      next if f.inbox_locked?
       next if MuteRule.where(user: f).any? { |rule| rule.applies_to? question }
 
       Inbox.create(user_id: f.id, question_id: question_id, new: true)

lib/errors.rb

@@ -35,6 +35,9 @@ module Errors
   class SelfAction < Forbidden
   end
 
+  class InboxLocked < Forbidden
+  end
+
   class FollowingSelf < SelfAction
   end
 

lib/use_case/question/create.rb

@@ -14,6 +14,7 @@ module UseCase
       option :direct, type: Types::Params::Bool, default: proc { true }
 
       def call
+        check_lock
         check_anonymous_rules
         check_blocks
 
@@ -42,6 +43,10 @@ module UseCase
 
       private
 
+      def check_lock
+        raise Errors::InboxLocked if target_user.inbox_locked?
+      end
+
       def check_anonymous_rules
         if !source_user_id && !anonymous
           # We can not create a non-anonymous question without a source user