Move validates_each into HasAttachedFile class

lib/paperclip.rb

@@ -186,11 +186,6 @@ def has_attached_file(name, options = {})
       after_destroy { send(name).send(:flush_deletes) }
 
       define_paperclip_callbacks :post_process, :"#{name}_post_process"
-
-      validates_each(name) do |record, attr, value|
-        attachment = record.send(name)
-        attachment.send(:flush_errors)
-      end
     end
   end
 end

lib/paperclip/has_attached_file.rb

@@ -11,13 +11,21 @@ def initialize(klass, name, options)
     end
 
     def define
+      define_flush_errors
       define_getter
       define_setter
       define_query
     end
 
     private
 
+    def define_flush_errors
+      @klass.send(:validates_each, @name) do |record, attr, value|
+        attachment = record.send(@name)
+        attachment.send(:flush_errors)
+      end
+    end
+
     def define_getter
       name = @name
       options = @options

test/has_attached_file_test.rb

@@ -14,6 +14,10 @@ class HasAttachedFileTest < Test::Unit::TestCase
     should 'define a query on the class object' do
       assert_adding_attachment('avatar').defines_method('avatar?')
     end
+
+    should 'flush errors as part of validations' do
+      assert_adding_attachment('avatar').defines_validation
+    end
   end
 
   private
@@ -31,13 +35,29 @@ def initialize(attachment_name)
     end
 
     def defines_method(method_name)
-      a_class = stub('class', define_method: nil)
+      a_class = stub_class
 
       Paperclip::HasAttachedFile.define_on(a_class, @attachment_name, {})
 
       assert_received(a_class, :define_method) do |expect|
         expect.with(method_name)
       end
     end
+
+    def defines_validation
+      a_class = stub_class
+
+      Paperclip::HasAttachedFile.define_on(a_class, @attachment_name, {})
+
+      assert_received(a_class, :validates_each) do |expect|
+        expect.with(@attachment_name)
+      end
+    end
+
+    private
+
+    def stub_class
+      stub('class', validates_each: nil, define_method: nil)
+    end
   end
 end