Issue to log in to Django using Tastypie

When trying to log in to Django using Tastypie, you may encounter an error "error_message": "column username is not unique". This is because Tastypie will try to create a new user with the username you want to verify, but this will throw a database error because the username already exists.

Solution

There are two ways to solve this problem:

Create a UserResource and add a method that allows the user to log in and pass the username and password. This approach is much safer because it does not create new users.
Change the authentication class toAuthorization(). This will allow the user to log in without creating a new user.

Code Example

Method 1:

from  import User
from  import authenticate, login, logout
from  import HttpUnauthorized, HttpForbidden
from  import url
from  import trailing_slash

class UserResource(ModelResource):
    class Meta:
        queryset = ()
        fields = ['first_name', 'last_name', 'email']
        allowed_methods = ['get', 'post']
        resource_name = 'user'

    def override_urls(self):
        return [
            url(r"^(?P<resource_name>%s)/login%s$" %
                (self._meta.resource_name, trailing_slash()),
                self.wrap_view('login'), name="api_login"),
            url(r'^(?P<resource_name>%s)/logout%s$' %
                (self._meta.resource_name, trailing_slash()),
                self.wrap_view('logout'), name='api_logout'),
        ]

    def login(self, request, **kwargs):
        self.method_check(request, allowed=['post'])

        data = (request, request.raw_post_data, format=('CONTENT_TYPE', 'application/json'))

        username = ('username', '')
        password = ('password', '')

        user = authenticate(username=username, password=password)
        if user:
            if user.is_active:
                login(request, user)
                return self.create_response(request, {
                    'success': True
                })
            else:
                return self.create_response(request, {
                    'success': False,
                    'reason': 'disabled',
                    }, HttpForbidden )
        else:
            return self.create_response(request, {
                'success': False,
                'reason': 'incorrect',
                }, HttpUnauthorized )

    def logout(self, request, **kwargs):
        self.method_check(request, allowed=['get'])
        if  and .is_authenticated():
            logout(request)
            return self.create_response(request, { 'success': True })
        else:
            return self.create_response(request, { 'success': False }, HttpUnauthorized)

Method 2:

from  import User
from  import authenticate, login, logout
from  import HttpUnauthorized, HttpForbidden
from  import url
from  import trailing_slash

class UserResource(ModelResource):

    class Meta:
        queryset = ()
        resource_name = 'user'
        allowed_methods = ['post']


    def prepend_urls(self):
        return [
            url(r"^user/login/$", self.wrap_view('login'), name="api_login"),
            url(r"^user/logout/$", self.wrap_view('logout'), name='api_logout'),
        ]

    def login(self, request, **kwargs):
        self.method_check(request, allowed=['post'])

        data = (request, request.raw_post_data, format=('CONTENT_TYPE', 'application/json'))

        username = ('username', '')
        password = ('password', '')

        user = authenticate(username=username, password=password)
        if user:
            if user.is_active:
                login(request, user)
                return self.create_response(request, {
                    'success': True
                })
            else:
                return self.create_response(request, {
                    'success': False,
                    'reason': 'disabled',
                }, HttpForbidden )
        else:
            return self.create_response(request, {
                'success': False,
                'reason': 'incorrect',
                }, HttpUnauthorized )

    def logout(self, request, **kwargs):
        self.method_check(request, allowed=['post'])
        if  and .is_authenticated():
            logout(request)
            return self.create_response(request, { 'success': True })
        else:
            return self.create_response(request, { 'success': False }, HttpUnauthorized)

In either method, you can log in by sending a POST request to the endpoint http://hostname/api/user/login. The requested data should have the following format:

{
  "username": "username",
  "password": "password"
}

If the login is successful, you will receive the following response:

{
  "success": True
}

If the login fails, you will receive the following response:

{
  "success": False,
  "reason": "incorrect"
}

This is the article about solving the problem of using Tastypie to log in to Django. For more related content on Tastypie to log in to Django, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!