fixed user tests

app/models/favorite.rb

@@ -0,0 +1,20 @@
+class Favorite < ActiveRecord::Base
+  TABLE_COUNT = 100
+  validates_uniqueness_of :post_id, :scope => :user_id
+  
+  def self.model_for(user_id)
+    mod = user_id % TABLE_COUNT
+    Object.const_get("Favorite#{mod}")
+  end
+  
+  def self.delete_post(post_id)
+    0.upto(TABLE_COUNT - 1) do |i|
+      model_for(i).destroy_all(:post_id => post_id)
+    end
+  end
+end
+
+0.upto(Favorite::TABLE_COUNT - 1) do |i|
+  Object.const_set("Favorite#{i}", Class.new(Favorite))
+  Object.const_get("Favorite#{i}").set_table_name("favorites_#{i}")
+end