Should RemoteForeignKey support NULL or empty value?

[jsaytoe]

I want to have a model that contain RemoteForeignKey field and i want this field to be nullable. I got database initialize successfully but i also got error when i created an model instance via Django python shell.

[KayEss]

Can you show me what the field in the model looks like and what error you're getting? The code that produces the error would also help.

It should work the way that Django normally does it, using blank=True etc.

[jsaytoe]

My Model example is below:
class Test(Model):
customer = RemoteForeignKey(model_url='slumber://c_service/Customer/')
payment = RemoteForeignKey(model_url='slumber://l_service/Payment/', null=True,blank=True)

when i created the Test model instance with only customer detail, i got the error as below:

import Test
t_object = Test.objects.create(customer = "slumber://c_service/Customer/data/1/")
Traceback (most recent call last):
File "", line 1, in
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/manager.py", line 137, in create
return self.get_query_set().create(*_kwargs)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/query.py", line 377, in create
obj.save(force_insert=True, using=self.db)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/base.py", line 463, in save
self.save_base(using=using, force_insert=force_insert, force_update=force_update)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/base.py", line 551, in save_base
result = manager._insert([self], fields=fields, return_id=update_pk, using=using, raw=raw)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/manager.py", line 203, in _insert
return insert_query(self.model, objs, fields, *_kwargs)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/query.py", line 1593, in insert_query
return query.get_compiler(using=using).execute_sql(return_id)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 911, in execute_sql
for sql, params in self.as_sql():
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 872, in as_sql
for obj in self.query.objs
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/django/db/models/fields/init.py", line 292, in get_db_prep_save
prepared=False)
File "/home/jsaytoe/workspace/virtual_env/shop/local/lib/python2.7/site-packages/slumber/fields.py", line 37, in get_db_prep_value
url = to_slumber_scheme(value._url, get_slumber_services())
AttributeError: 'NoneType' object has no attribute '_url'

I think we should take care on both get_prep_value and get_db_prep_value method in fields.py file for support null value

Hope this information help us to fix the issue