Django Tastypie, ManyToMany Saving Error

Question

i got a problem when i\'m saving an item, via tastypie api. (POST method)

Here is my api.py code.

from tastypie.resources import ModelResource, ALL,          


        

Answer 1

I'm pretty sure, that you're posting user resources as comma-separated id's. That's not the way tastypie handles related resources by default. You should post a list of urls, pointing to the related resources, in your case - smth like '/api/v1/users/1'.

Alternatively you can change hydrate_m2m to hydrate_users. Generic hydrate_m2m iterates over every field in you resource and tries to convert it from url-string to an instance of related resource (that's why you get error about the "provided URL"). The code for hydrate_users might look like this:

def hydrate_users(self, bundle):
    try:
        user_ids = map(int, bundle.data.get('users', []))
    except ValueError:
        raise BadRequest("User ids must be ints") # from tastypie.exceptions
    bundle.data['users'] = User.objects.filter(id__in=user_ids)
    return bundle

Hope this helps

EDIT: removed lambda in favour of int as Carson suggested