Added HasManyAssociation#count that works like Base#count #413 [intinig]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@318 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

 *SVN*
 
+* Added HasManyAssociation#count that works like Base#count #413 [intinig]
+
 * Fixed handling of binary content in blobs and similar fields for Ruby/MySQL and SQLite #409 [xal]
 
 * Added dynamic attribute-based finders as a cleaner way of getting objects by simple queries without turning to SQL. 

activerecord/lib/active_record/associations/has_many_association.rb

@@ -47,6 +47,17 @@ def find_all(runtime_conditions = nil, orderings = nil, limit = nil, joins = nil
         end
       end
 
+      # Count the number of associated records. All arguments are optional.
+      def count(runtime_conditions = nil)
+        if @options[:finder_sql]
+          @association_class.count_by_sql(@finder_sql)
+        else
+          sql = @finder_sql
+          sql << " AND #{sanitize_sql(runtime_conditions)}" if runtime_conditions
+          @association_class.count(sql)
+        end
+      end
+      
       # Find the first associated record.  All arguments are optional.
       def find_first(conditions = nil, orderings = nil)
         find_all(conditions, orderings, 1).first

activerecord/test/associations_test.rb

@@ -149,6 +149,10 @@ def force_signal37_to_load_all_clients_of_firm
     @signals37.clients_of_firm.each {|f| }
   end
   
+  def test_counting
+    assert_equal 2, Firm.find_first.clients.count
+  end
+  
   def test_finding
     assert_equal 2, Firm.find_first.clients.length
   end