django-taggit-serializer 'Invalid json list. A tag list submitted in string form must be valid json.

When I try to create object from test client I get this error {'tag': ['Invalid json list. A tag list submitted in string form must be valid json.']}. Here is the code:

self.client.post('/api/notes/', data={'tag': ["xyz"], 'iv': 'random', 'content': "New content",
                                                         'date': self.current_date_time})

Jan 07 '17 13:01 pyprism

Can you try it with:

import json

self.client.post('/api/notes/', 
                        data=json.dumps({
                            'tag': ["xyz"], 
                            'iv': 'random', 'content': "New content",
                            'date': self.current_date_time
                         }))

to check if this "post" only translate the dict into a str instead of a valid JSON-String

Jan 09 '17 20:01 RafaAguilar

Here is the response I got after following your suggestion

{'non_field_errors': ['Invalid data. Expected a dictionary, but got str.']}

Jan 13 '17 12:01 pyprism

just to make sure, these are the tests correct?

What about adding the kwarg format (I just want to make sure format is correct)

self.client.post('/api/notes/', data={'tag': ["xyz"], 'iv': 'random', 'content': "New content",
                                                         'date': self.current_date_time}, format='json')

Let me know if that did anything!

Jan 17 '17 11:01 glemmaPaul

I am already using format='json'.

Jan 17 '17 12:01 pyprism

@pyprism are you able to use it by requesting via HTTP, e.g Postman?

Feb 09 '17 09:02 glemmaPaul

Hi, Same behavior for me with the last (actual) DRF 3.6

{
    "tags": [
        "Invalid json list. A tag list submitted in string form must be valid json."
    ]
}

Mar 17 '17 09:03 foxmask

@glemmaPaul It seems like serializer is having trouble with Querydict. To deal with multiple values for the same key, Querydict stores each value with the same key in a list. Also, a JSON array treated as a set of values, so its items are stored in a single list. So, above code will generate Querydict like below: <QueryDict: {'tag': ['xyz'], 'iv': ['random'], 'content': ['New content'], 'date': [...]}> And, Querydict returns the last value when accessing for a key. So, when serializer retrieves the item for a key 'tag', it will get 'xyz', not ['xyz'].

Jun 09 '17 17:06 ppnchb

I found the forum article says request.data is sometimes QueryDict, sometimes normal dict. Maybe converting request.data from QueryDict to dict in views.py can temporally solve the problem..

Jun 09 '17 18:06 ppnchb

I have the same problem, any solutions?

Apr 16 '18 17:04 kamilgregorczyk

I'm also having the same problem?

Jul 10 '18 18:07 adnanmuttaleb

I'm also having the same problem

Sep 23 '18 08:09 linpan

I ran into the same problem

Oct 16 '18 23:10 hsbzzhz

Was there ever a resolution to this? It is still a prevalent issue with tags in DRF 3.0+ @hsbzzhz @linpan @glemmaPaul

Mar 18 '19 01:03 lowkeyshift

I found a temp solution. I think this is caused by python str is single quote by default but json use double quotes data={'tag': str(["xyz"]).replace("'", '"')} will work

Mar 27 '19 17:03 renguomin

I found a temp solution. I think this is caused by python str is single quote by default but json use double quotes data={'tag': str(["xyz"]).replace("'", '"')} will work

This works for me as well. Thanks! The API itself also seems to work, when called with Postman.