Django Tastypie PATCH throws "'Bundle' object is not iterable" error

Question

I'm working on an API and for one of my endpoints I want to be able to make partial updates. Here is the tastypie resource ``` class StoryResource(ModelResource): authors = fields.ToManyField(SimpleAuthorResource, 'authors', full=True) posts = fields.ToManyField(SimplePostResource, 'posts', full=True, blank=True) cover_photo = fields.ForeignKey(PhotoResource, 'cover_photo', full=True) class Meta: queryset = Story.objects.all() resource_name = 'story' validation = ModelFormValidation(form_class=StoryForm) authorization = Authorization() allowed_methods = ['get', 'post', 'patch', 'put'] ordering = ['-created_ts'] def determine_format(self, request): return "application/json" ``` And I'm using POSTMAN to make a PATCH request to update a field in the Story model. It returns with this error: {"error_message": "'Bundle' object is not iterable", "traceback": "Traceback (most recent call last):

File "/usr/local/lib/python2.7/dist-packages/tastypie/resources.py", line 192, in wrapper
 r…

Accepted Answer

Sounds like your validation is trying to iterate through your foreign key bundles with this line:

```
for one_uri in uris:
```

That's where the `"Bundle" object is not iterable` is coming from. If you want to iterate over those fields as resource_uris, remove `full=True` from those FK fields.

If you want to keep them as `full=True`, you'll need to update your validation to either handle bundles for those fields or exclude them from the validation by using `exclude` in your form Meta class:

```
class ModelFormValidation:
    ...

class Meta:
        exclude = (
            authors,
            posts,
            cover_photo            
        )
```

Django Tastypie PATCH throws "'Bundle' object is not iterable" error

Solution

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