Added methods for resetting the cached information on classes that you want to...

Added methods for resetting the cached information on classes that you want to clear between requests in development mode

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@130 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/lib/active_record/base.rb

@@ -189,10 +189,6 @@ def self.inherited(child) #:nodoc:
 
     @@subclasses = {}
     
-    def self.subclasses
-      @@subclasses.values.flatten
-    end
-
     cattr_accessor :configurations
     @@primary_key_prefix_type = {}
     
@@ -222,7 +218,7 @@ def self.subclasses
 
     # When turned on (which is default), all associations are included using "load". This mean that any change is instant in cached
     # environments like mod_ruby or FastCGI. When set to false, "require" is used, which is faster but requires server restart to
-    # be effective.
+    # reflect changes.
     @@reload_associations = true
     cattr_accessor :reload_associations
 
@@ -522,6 +518,15 @@ def column_methods_hash
           methods
         end
       end
+      
+      # Resets all the cached information about columns, which will cause they to be reloaded on the next request.
+      def reset_column_information
+        @columns = @columns_hash = @content_columns = @dynamic_methods_hash = nil
+      end
+
+      def reset_column_information_and_inheritable_attributes_for_all_subclasses
+        subclasses.each { |klass| klass.reset_inheritable_attributes; klass.reset_column_information }
+      end
 
       # Transforms attribute key names into a more humane format, such as "First name" instead of "first_name". Example:
       #   Person.human_attribute_name("first_name") # => "First name"