Revert r8742: remove has_many with :group option since it has sketchy sql support. Closes #10480.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8790 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

2 files changed, 0 insertions, 15 deletions

diff --git a/activerecord/lib/active_record/associations.rb b/activerecord/lib/active_record/associations.rb
index a1c8bd6e50..cb17b6e483 100755
--- a/activerecord/lib/active_record/associations.rb
+++ b/activerecord/lib/active_record/associations.rb
@@ -55,12 +55,6 @@ module ActiveRecord
     end
   end
 
-  class HasManyThroughCantCountOnColumnForGroupedAssociation < ActiveRecordError #:nodoc:
-    def initialize(owner, reflection, column_name)
-      super("Cannot count on column '#{column_name}' for association '#{owner.class.name}##{reflection.name}' grouped by '#{reflection.options[:group]}'.")
-    end
-  end
-
   class EagerLoadPolymorphicError < ActiveRecordError #:nodoc:
     def initialize(reflection)
       super("Can not eagerly load the polymorphic association #{reflection.name.inspect}")
diff --git a/activerecord/lib/active_record/associations/has_many_through_association.rb b/activerecord/lib/active_record/associations/has_many_through_association.rb
index 06ea5d1d1c..94842f424d 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -124,15 +124,6 @@ module ActiveRecord
           column_name = "#{@reflection.quoted_table_name}.#{@reflection.klass.primary_key}" if column_name == :all
           options.merge!(:distinct => true) 
         end
-
-        if @reflection.options[:group]
-          unless column_name == :all
-            raise HasManyThroughCantCountOnColumnForGroupedAssociation.new(@owner, @reflection, column_name)
-          end
-          column_name = @reflection.options[:group]
-          options.merge!(:distinct => true)
-        end
-
         @reflection.klass.send(:with_scope, construct_scope) { @reflection.klass.count(column_name, options) } 
       end