Custom api using extra_action gives error on POST request.

[abdulwahid24]

I have added custom api using extra_action such as
class Meta:
extra_actions = [
{
'name': 'login',
'http_method': 'POST',
'resource_type':'list',
'fields':{
'username': {
'type': 'string',
'required': True,
'description':'Unique username required.'
},
'password': {
'type': 'string',
'required': True,
'description':'password required'
}
}
}
]

This display the api in doc as mentioned in attached picture.

But when i fill all mentioned fields and press "Try it Out" than it gives me error such as

{
"error_message": "The format indicated 'text/plain' had no available deserialization method. Please check your formats and content_types on your Serializer.",
"traceback": "Traceback (most recent call last):\n\n File "/home/synerzip/educator-env/local/lib/python2.7/site-packages/tastypie/resources.py", line 195, in wrapper\n response = callback(request, _args, *_kwargs)\n\n File "/home/synerzip/Dropbox/Educator/educator-backend/educator/users/api.py", line 121, in login\n data = self.deserialize(request, request.body, format=request.META.get('CONTENT_TYPE', 'application/json'))\n\n File "/home/synerzip/educator-env/local/lib/python2.7/site-packages/tastypie/resources.py", line 375, in deserialize\n deserialized = self._meta.serializer.deserialize(data, format=request.META.get('CONTENT_TYPE', 'application/json'))\n\n File "/home/synerzip/educator-env/local/lib/python2.7/site-packages/tastypie/serializers.py", line 219, in deserialize\n raise UnsupportedFormat("The format indicated '%s' had no available deserialization method. Please check your formats and content_types on your Serializer." % format)\n\nUnsupportedFormat: The format indicated 'text/plain' had no available deserialization method. Please check your formats and content_types on your Serializer.\n"
}

Please refer the attached image.

Thanks,
AbdulWahid

[johnraz]

This is an issue with the header format sent with your request.
I don't know of the top of my head why it is text/plain but it should be application/json.

[Seraf]

Hello,

Same problem here.

Request URL
/backend/api/v1/user/login/?username=seraf&password=XXXXXX&api_key=special-key

Response Body
{
"error_message": "The format indicated '' had no available deserialization method. Please check your formats and content_types on your Serializer.",
"traceback": "Traceback (most recent call last):\n\n File "/usr/local/lib/python2.7/dist-packages/tastypie/resources.py", line 201, in wrapper\n response = callback(request, _args, *_kwargs)\n\n File "/home/julien/Sandbox/LISA/lisa/server/web/weblisa/api/accounts.py", line 124, in dispatch_login\n return self.dispatch_public('login', request, *_kwargs)\n\n File "/home/julien/Sandbox/LISA/lisa/server/web/weblisa/api/mixins.py", line 35, in dispatch_public\n response = method(request, *_kwargs)\n\n File "/home/julien/Sandbox/LISA/lisa/server/web/weblisa/api/accounts.py", line 127, in post_login\n data = self.deserialize(request, request.body, format=request.META.get('CONTENT_TYPE', 'application/json'))\n\n File "/usr/local/lib/python2.7/dist-packages/tastypie/resources.py", line 381, in deserialize\n deserialized = self._meta.serializer.deserialize(data, format=request.META.get('CONTENT_TYPE', 'application/json'))\n\n File "/usr/local/lib/python2.7/dist-packages/tastypie/serializers.py", line 221, in deserialize\n raise UnsupportedFormat("The format indicated '%s' had no available deserialization method. Please check your formats and content_types on your Serializer." % format)\n\nUnsupportedFormat: The format indicated '' had no available deserialization method. Please check your formats and content_types on your Serializer.\n"
}

But, using POSTMAN application and sending the parameters using the application/json, it works. I suspect a bug with swagger (as the api works correctly on tastypie side).

I tried to print request.META.get('CONTENT_TYPE'). With postman I got "application/json", with swagger UI, got nothing. Hope it will help.

[Seraf]

Hi, I think I found the problem.
The post parameters are sent in the query and not the body.
In the 1.2 specs, there's a paramType : https://github.com/wordnik/swagger-spec/blob/master/versions/1.2.md#524-parameter-object
I tried to set 'paramType': 'body' in my field but with no effect (with the last master). Maybe not implemented ?

[johnraz]

Probably related to the swagger specs not being fully implemented. See here for a starting point.

[sanketsalunkhe]

i also got same error

my content type is application/json
still it not working

help me

[yusufcanb]

same issue with angularjs.