fixes #2386, fix tests

app/models/post.rb

@@ -20,6 +20,7 @@ class Post < ActiveRecord::Base
   before_save :update_tag_post_counts
   before_save :set_tag_counts
   before_save :set_pool_category_pseudo_tags
+  before_create :autoban
   before_validation :strip_source
   before_validation :initialize_uploader, :on => :create
   before_validation :parse_pixiv_id
@@ -290,6 +291,12 @@ class Post < ActiveRecord::Base
     def disapproved_by?(user)
       PostDisapproval.where(:user_id => user.id, :post_id => id).exists?
     end
+
+    def autoban
+      if has_tag?("banned_artist")
+        self.is_banned = true
+      end
+    end
   end
 
   module PresenterMethods
@@ -1558,6 +1565,7 @@ class Post < ActiveRecord::Base
   def reload(options = nil)
     super
     reset_tag_array_cache
+    @pools = nil
     @tag_categories = nil
     @typed_tags = nil
     self