django-tastypie: Posting to a Resource having ManytoMany field with through relationship

Question

I\'m working on a API for a project and I have a relationship Order/Products through OrderProducts like this:

In models.py

class Product(models.Model         


        

Answer 1

If you are allowed to modify class OrderProducts, adding auto_created = True might solve your problem, i.e.,

class OrderProducts(models.Model): 
    class Meta:
        auto_created = True

If you cannot change class OrderProducts, try the following tastypie patch.

---------------------------- tastypie/resources.py ----------------------------
index 2cd869e..aadf874 100644
@@ -2383,7 +2383,20 @@ class BaseModelResource(Resource):
                     related_resource.save(updated_related_bundle)
                 related_objs.append(updated_related_bundle.obj)

-            related_mngr.add(*related_objs)
+            if hasattr(related_mngr, 'through'):
+                through = getattr(related_mngr, 'through')
+                if not through._meta.auto_created:
+                    for related_obj in related_objs:
+                        args = dict()
+                        args[related_mngr.source_field_name] = bundle.obj
+                        args[related_mngr.target_field_name] = related_obj
+                        through_obj = through(**args)
+                        through_obj.save()
+                else:
+                    related_mngr.add(*related_objs)
+            else:
+                related_mngr.add(*related_objs)

     def detail_uri_kwargs(self, bundle_or_obj):
         """

In Django 1.7, the error message is changed to "Cannot set values on a ManyToManyField which specifies an intermediary model". The solution is the same.