Changed those private ActiveRecord methods to take optional third arg…

…ument :auto instead of nil for performance optimizations. (closes #4456) [Stefan]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4141 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Changed those private ActiveRecord methods to take optional third argument :auto instead of nil for performance optimizations.  (closes #4456) [Stefan]
+
 * Private ActiveRecord methods add_limit!, add_joins!, and add_conditions! take an OPTIONAL third argument 'scope' (closes #4456) [Rick]
 
 * DEPRECATED: Using additional attributes on has_and_belongs_to_many associations. Instead upgrade your association to be a real join model [DHH]

activerecord/lib/active_record/base.rb

@@ -871,7 +871,7 @@ def with_scope(method_scoping = {}, action = :merge, &block)
 
         begin
           yield
-        ensure 
+        ensure
           self.scoped_methods.pop
         end
       end
@@ -1037,25 +1037,26 @@ def safe_to_array(o)
         end
 
         # The optional scope argument is for the current :find scope.
-        def add_limit!(sql, options, scope = nil)
-          if scope ||= scope(:find)
+        def add_limit!(sql, options, scope = :auto)
+          scope = scope(:find) if :auto == scope
+          if scope
             options[:limit]  ||= scope[:limit]
             options[:offset] ||= scope[:offset]
           end
           connection.add_limit_offset!(sql, options)
         end
 
         # The optional scope argument is for the current :find scope.
-        def add_joins!(sql, options, scope = nil)
-          scope ||= scope(:find)
+        def add_joins!(sql, options, scope = :auto)
+          scope = scope(:find) if :auto == scope
           join = (scope && scope[:joins]) || options[:joins]
           sql << " #{join} " if join
         end
 
         # Adds a sanitized version of +conditions+ to the +sql+ string. Note that the passed-in +sql+ string is changed.
         # The optional scope argument is for the current :find scope.
-        def add_conditions!(sql, conditions, scope = nil)
-          scope  ||= scope(:find)
+        def add_conditions!(sql, conditions, scope = :auto)
+          scope = scope(:find) if :auto == scope
           segments = []
           segments << sanitize_sql(scope[:conditions]) if scope && scope[:conditions]
           segments << sanitize_sql(conditions) unless conditions.nil?