1 files changed, 6 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/associations/has_many_association.rb b/activerecord/lib/active_record/associations/has_many_association.rb
index 607ed0da46..0a23109b9b 100644
--- a/activerecord/lib/active_record/associations/has_many_association.rb
+++ b/activerecord/lib/active_record/associations/has_many_association.rb
@@ -32,6 +32,7 @@ module ActiveRecord
 
       def insert_record(record, validate = true, raise = false)
         set_owner_attributes(record)
+        set_inverse_instance(record)
 
         if raise
           record.save!(:validate => validate)
@@ -125,7 +126,11 @@ module ActiveRecord
         end
 
         def foreign_key_present?
-          owner.attribute_present?(reflection.association_primary_key)
+          if reflection.klass.primary_key
+            owner.attribute_present?(reflection.association_primary_key)
+          else
+            false
+          end
         end
     end
   end