Merge commit 'rails/master'

Conflicts:
	activerecord/lib/active_record/calculations.rb
	activerecord/lib/active_record/connection_adapters/mysql_adapter.rb
	activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

6 files changed, 34 insertions, 6 deletions

diff --git a/activerecord/lib/active_record/associations/association_collection.rb b/activerecord/lib/active_record/associations/association_collection.rb
index e67ccfb228..1b7bf42b91 100644
--- a/activerecord/lib/active_record/associations/association_collection.rb
+++ b/activerecord/lib/active_record/associations/association_collection.rb
@@ -208,6 +208,7 @@ module ActiveRecord
       # Note that this method will _always_ remove records from the database
       # ignoring the +:dependent+ option.
       def destroy(*records)
+        records = find(records) if records.any? {|record| record.kind_of?(Fixnum) || record.kind_of?(String)}
         remove_records(records) do |records, old_records|
           old_records.each { |record| record.destroy }
         end
diff --git a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
index fd23e59e82..d91c555dad 100644
--- a/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb
@@ -1,6 +1,11 @@
 module ActiveRecord
   module Associations
     class HasAndBelongsToManyAssociation < AssociationCollection #:nodoc:
+      def initialize(owner, reflection)
+        super
+        @primary_key_list = {}
+      end
+
       def create(attributes = {})
         create_record(attributes) { |record| insert_record(record) }
       end
@@ -17,6 +22,12 @@ module ActiveRecord
         @reflection.reset_column_information
       end
 
+      def has_primary_key?
+        return @has_primary_key unless @has_primary_key.nil?
+        @has_primary_key = (ActiveRecord::Base.connection.supports_primary_key? &&
+          ActiveRecord::Base.connection.primary_key(@reflection.options[:join_table]))
+      end
+
       protected
         def construct_find_options!(options)
           options[:joins]      = @join_sql
@@ -29,6 +40,11 @@ module ActiveRecord
         end
 
         def insert_record(record, force = true, validate = true)
+          if has_primary_key?
+            raise ActiveRecord::ConfigurationError,
+              "Primary key is not allowed in a has_and_belongs_to_many join table (#{@reflection.options[:join_table]})."
+          end
+
           if record.new_record?
             if force
               record.save!
diff --git a/activerecord/lib/active_record/associations/has_many_association.rb b/activerecord/lib/active_record/associations/has_many_association.rb
index e4b631bc54..73d3c23cd3 100644
--- a/activerecord/lib/active_record/associations/has_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_association.rb
@@ -74,6 +74,7 @@ module ActiveRecord
                 "#{@reflection.primary_key_name} = NULL", 
                 "#{@reflection.primary_key_name} = #{owner_quoted_id} AND #{@reflection.klass.primary_key} IN (#{ids})"
               )
+              @owner.class.update_counters(@owner.id, cached_counter_attribute_name => -records.size) if has_cached_counter?
           end
         end
 
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 2ed92ca1ba..6004751dc9 100644
--- a/activerecord/lib/active_record/associations/has_many_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_through_association.rb
@@ -20,7 +20,11 @@ module ActiveRecord
         ensure_owner_is_not_new
 
         transaction do
-          self << (object = attrs ? @reflection.klass.send(:with_scope, :create => attrs) { @reflection.create_association } : @reflection.create_association)
+          object = attrs ? @reflection.klass.send(:with_scope, :create => attrs) { @reflection.create_association } : @reflection.create_association
+          raise_on_type_mismatch(object)
+          add_record_to_target_with_callbacks(object) do |r|
+            insert_record(object, false)
+          end
           object
         end
       end
@@ -54,7 +58,7 @@ module ActiveRecord
           options[:select]  = construct_select(options[:select])
           options[:from]  ||= construct_from
           options[:joins]   = construct_joins(options[:joins])
-          options[:include] = @reflection.source_reflection.options[:include] if options[:include].nil?
+          options[:include] = @reflection.source_reflection.options[:include] if options[:include].nil? && @reflection.source_reflection.options[:include]
         end
 
         def insert_record(record, force = true, validate = true)
diff --git a/activerecord/lib/active_record/associations/has_one_through_association.rb b/activerecord/lib/active_record/associations/has_one_through_association.rb
index 830aa1808a..a79bf943d1 100644
--- a/activerecord/lib/active_record/associations/has_one_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_through_association.rb
@@ -18,9 +18,15 @@ module ActiveRecord
         current_object = @owner.send(@reflection.through_reflection.name)
 
         if current_object
-          new_value ? current_object.update_attributes(construct_join_attributes(new_value)) : current_object.destroy
-        else
-          @owner.send(@reflection.through_reflection.name,  klass.send(:create, construct_join_attributes(new_value))) if new_value
+           new_value ? current_object.update_attributes(construct_join_attributes(new_value)) : current_object.destroy
+        elsif new_value
+          if @owner.new_record?
+            self.target = new_value
+            through_association = @owner.send(:association_instance_get, @reflection.through_reflection.name)
+            through_association.build(construct_join_attributes(new_value))
+          else
+            @owner.send(@reflection.through_reflection.name, klass.create(construct_join_attributes(new_value)))
+          end
         end
       end
 
diff --git a/activerecord/lib/active_record/associations/through_association_scope.rb b/activerecord/lib/active_record/associations/through_association_scope.rb
index c172e7b8f9..1924156e2a 100644
--- a/activerecord/lib/active_record/associations/through_association_scope.rb
+++ b/activerecord/lib/active_record/associations/through_association_scope.rb
@@ -93,7 +93,7 @@ module ActiveRecord
       # Construct attributes for :through pointing to owner and associate.
       def construct_join_attributes(associate)
         # TODO: revist this to allow it for deletion, supposing dependent option is supported
-        raise ActiveRecord::HasManyThroughCantAssociateThroughHasManyReflection.new(@owner, @reflection) if @reflection.source_reflection.macro == :has_many
+        raise ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection.new(@owner, @reflection) if [:has_one, :has_many].include?(@reflection.source_reflection.macro)
 
         join_attributes = construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.primary_key_name => associate.id)