REST Framework Retrieved Wrong Data - django

I was just getting started on using Django's rest framework. The problem I faced is that Rest Framework didn't fetch from the right URL: I want it to get the list of Todos but it returned the URL where the API was located.
(Might be easy for many of you, but I am completely fresh to drf)
serializers
from .models import Todo
from rest_framework import serializers
class TodoSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = Todo
fields = ['title', 'desc', 'level', 'created']
urls
from django.urls import path, include
from rest_framework import routers
from . import views
router = routers.DefaultRouter()
router.register(r'todos', views.TodoViewSet)
urlpatterns = [
path('', views.IndexView.as_view(), name='todo_all'),
path('api/', include(router.urls)),
]
views
from django.views.generic.base import TemplateView
from rest_framework import viewsets
from .models import Todo
from .serializers import TodoSerializer
class IndexView(TemplateView):
template_name = "todo/index.html"
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['todos'] = Todo.objects.all()
return context
class TodoViewSet(viewsets.ModelViewSet):
queryset = Todo.objects.all()
serializer_class = TodoSerializer
What I want Rest to get:
What Rest actually displayed:
Like, I want the data of the todos, not the URL. Thanks in advance.

You have used HyperlinkedModelSerializer. Try to use ModelSerializer instead.
from .models import Todo
from rest_framework import serializers
class TodoSerializer(serializers.ModelSerializer):
class Meta:
model = Todo
fields = ['title', 'desc', 'level', 'created']

Related

How do I parameterize the django url using router.register?

I am newbie in Django. So this might be a trivial question.
I have been been building urlpatterns as following
router = DefaultRouter()
router.register('posts', views.PostViewSet)
urlpatterns = [
path('', include(router.urls))
]
This creates URLs like api/posts and so on.
Now, I am trying to add a voting model to this.. For which I want to create URL like
api/posts/<id>/vote
But I don't want to create a path like
urlpatterns = [
path('', include(router.urls)),
path('posts/<int:pk>/vote', views.SomeView)
]
Is there a way to do this via router.register way?
First You will define default router same way as you defined.
router = DefaultRouter()
router.register('posts', views.PostViewSet, basename='posts')
urlpatterns = [
path('', include(router.urls))
]
Then define Serializer class as you needed.
from rest_framework import serializers
from .models import Post
class PostSerializer(serializers.ModelSerializer):
class Meta:
model = Post
fields = '__all__'
Now define the custom method of vote inside PostViewSet with Allowed HTTP methods.
from rest_framework.response import Response
from rest_framework import viewsets, status
from rest_framework.decorators import action
from .models import Post
from .serializers import PostSerializer
class PostViewSet(viewsets.ModelViewSet):
queryset = Post.objects.all()
serializer_class = PostSerializer
#action(detail=True, methods=['Get'])
def vote(self, request, pk=None):
queryset = Post.objects.filter(pk=pk)
serializer = PostSerializer(queryset, many=True)
return Response(serializer.data, status=status.HTTP_200_OK)
Now you will be able to access the vote with your desired URL as api/posts/<pk>/vote

How to integrate mixpanel to django backend

I am new with integrating mixpanel to Django backend to track events,As i try to track, it gives me empty brackets anyone with ideas or resources please help me am quite stack
views.py
from django.shortcuts import render
from django.views import View
from rest_framework.generics import ListCreateAPIView
from rest_framework.views import APIView
from rest_framework.response import Response
from .serialize import UserSerializer, TweakSerializer, ChannelSerializer, SubscriberSerializer
from tweaks.models import Tweak
from accounts.models import User
from channels.models import Channel, Subscriber
from mixpanel import Mixpanel
import json
# Create your views here.
mp = Mixpanel('TOKEN')
class userApi(ListCreateAPIView):
queryset = User.objects.all()
serializer_class = UserSerializer
def get(self, request):
queryset = self.get_queryset()
serializer = UserSerializer(queryset, many=True)
return Response(serializer.data)
apiuser=userApi()
point = json.dumps(apiuser.__dict__)
mp.track(point, 'users')
serializers.py
from rest_framework import routers, serializers, viewsets
from django.urls import path, include
from accounts.models import User
from tweaks.models import Tweak
from channels.models import Channel, Subscriber
class UserSerializer(serializers.ModelSerializer):
class Meta:
model = User
fields = 'username', 'email', 'first_name', 'last_name', 'date_joined'

Django Rest Framework Assertion Error: Missing Meta.model attribute

I am trying to implement Rest api using Django framework. But when I click on the url on the default index page it gives me an assertion error at/languages/ Class LanguageSerializer missing meta.model attribute
I made all the migrations after changes in models.py but it did nothing
urls.py
from django.urls import path, include
from . import views
from rest_framework import routers
router = routers.DefaultRouter()
router.register('languages', views.LanguageView)
urlpatterns = [
path('', include(router.urls))
]
models.py
from django.db import models
class Language(models.Model):
name = models.CharField(max_length=50)
paradigm = models.CharField(max_length=50)
serializers.py
from rest_framework import serializers
from .models import Language
class LanguageSerializer(serializers.ModelSerializer):
class Meta:
fields = ('id', 'name', 'paradigm')
views.py
from django.shortcuts import render
from rest_framework import viewsets
from .models import Language
from .serializers import LanguageSerializer
class LanguageView(viewsets.ModelViewSet):
queryset = Language.objects.all()
serializer_class = LanguageSerializer
I have no clue where am I going wrong
You need to specify what model you want to serialize in the Meta class of your serializer, like:
from rest_framework import serializers
from .models import Language
class LanguageSerializer(serializers.ModelSerializer):
class Meta:
model = Language # specify the model
fields = ('id', 'name', 'paradigm')
otherwise the serializer can not determine the fields of that model, and how it will serialize the data from these fields.

Django Rest Framework urls.py getting messed up

I am having my models.py file defined as below:-
from django.db import models
from django.contrib.auth.models import User
class Custom_User(models.Model):
user = models.ForeignKey(User, on_delete=models.CASCADE)
mobile = models.CharField(max_length=20)
REGISTRATION_CHOICES = (
('Learner', 'Learner'),
('Trainer', 'Trainer'),
)
primary_registration_type = models.CharField(max_length=15, choices=REGISTRATION_CHOICES)
def __str__(self):
return self.user.email
As you can see that my Custom_User model uses Django's User model as its foreign Key.
For the above model I have defined my serialziers.py file like this:-
from django.contrib.auth.models import User
from rest_framework import serializers
from .models import *
class UserSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = User
fields = ('url', 'username', 'email')
class Custom_UserSerializer(serializers.HyperlinkedModelSerializer):
user = UserSerializer()
class Meta:
model = Custom_User
fields = ('__all__')
Now I am using this serializers in my viewsets like below:-
from django.contrib.auth.models import User
from rest_framework import viewsets
from .serializers import *
class UserViewSet(viewsets.ModelViewSet):
"""
API endpoint that allows users to be viewed or edited.
"""
queryset = User.objects.all()
serializer_class = UserSerializer
class Custom_UserViewSet(viewsets.ModelViewSet):
queryset = Custom_User.objects.all()
serializer_class = Custom_UserSerializer
class TrainerViewSet(viewsets.ModelViewSet):
queryset = Custom_User.objects.filter(primary_registration_type="Trainer")
serializer_class = Custom_UserSerializer
class LearnerViewSet(viewsets.ModelViewSet):
queryset = Custom_User.objects.filter(primary_registration_type="Learner")
serializer_class = Custom_UserSerializer
And Finally inside my urls.py file I register them as below:-
from rest_framework import routers
router = routers.DefaultRouter()
router.register(r'users', api_mailing_list_views.UserViewSet)
router.register(r'custom_users', api_mailing_list_views.Custom_UserViewSet)
router.register(r'trainers', api_mailing_list_views.TrainerViewSet)
router.register(r'learners', api_mailing_list_views.LearnerViewSet)
urlpatterns = [
path('admin/', admin.site.urls),
path('', mailing_list_views.index, name='index'),
path('api/', include(router.urls)),
path('api-auth/', include('rest_framework.urls', namespace='rest_framework')),
]
As I was expecting the urls list to be like below in my browser:
{
"users": "http://localhost:8080/api/users/",
"custom_users": "http://localhost:8080/api/custom_users/",
"trainers": "http://localhost:8080/api/trainers/",
"learners": "http://localhost:8080/api/learners/"
}
But what i get instead is a list of urls like this:-
{
"users": "http://localhost:8080/api/users/",
"custom_users": "http://localhost:8080/api/trainers/",
"trainers": "http://localhost:8080/api/trainers/",
"learners": "http://localhost:8080/api/trainers/"
}
However I am not getting any errors or if I visit the following url:-
http://localhost:8080/api/learners/
which is not showing up in the urls list I still get the filtered list of learners in JSON format.
Thanks for the help in advance.
you need to provide basename during router register as all of them actually from same custom_user model.
router = routers.DefaultRouter()
router.register(r'users', api_mailing_list_views.UserViewSet, basename='users')
router.register(r'custom_users', api_mailing_list_views.Custom_UserViewSet, basename='custom_user')
router.register(r'trainers', api_mailing_list_views.TrainerViewSet, basename='trainers')
router.register(r'learners', api_mailing_list_views.LearnerViewSet, basename='learners')
Django-rest-framework's router tries to identify the viewset by its model/queryset, since both viewsets use the same model things most likely get mixed up.
From the documentation:
If unset the basename will be automatically generated based on the queryset attribute of the viewset, if it has one. Note that if the viewset does not include a queryset attribute then you must set basename when registering the viewset.
Try providing a basename to the router:
router.register(r'custom_users', api_mailing_list_views.Custom_UserViewSet, basename='custom_users')
router.register(r'trainers', api_mailing_list_views.TrainerViewSet, basename='trainers')
router.register(r'learners', api_mailing_list_views.LearnerViewSet, basename='learners')

How to add django-reversion to an app developed using django and django-rest framework

I have an app developed using Django and Django Rest framework. I would like to add the django-reversion feature to my app.
I have already tried http://django-reversion.readthedocs.org/en/latest/api.html#low-level-api but I have failed to make specific changes to my app.
Below are the modules of the app where I would like to include the Django-reversion to restore objects if they get deleted. How to set the django-reversion configuration for the below modules
admin.py:-
from django.contrib import admin
from.models import Category
admin.site.register(Category)
models.py:-
from django.db import models
class Category(models.Model):
name = models.CharField(max_length=64, unique=True)
def __unicode__(self):
return self.name
serializers.py:-
from rest_framework import serializers
from .models import Category
class CategorySerializer(serializers.ModelSerializer):
courses = serializers.HyperlinkedRelatedField(
many=True
read_only=True
view_name='course-detail'
)
class Meta:
model = Category
fields = ('pk', 'name', 'courses',)
urls.py :-
from django.conf.urls import patterns, url
from rest_framework.urlpatterns import format_suffix_patterns
from .import views
from django.conf.urls import include
category_list = views.CategoryViewSet.as_view({
'get': 'list',
'post': 'create'
})
category_detail = views.CategoryViewSet.as_view({
'get': 'retrieve',
'put': 'update',
'patch': 'partial_update',
'delete': 'destroy',
})
urlpatterns = format_suffix_patterns([
url(r'^categories/$',
category_list,
name='category-list'),
url(r'^categories/(?P<pk>[0-9]+)/$',
category_detail,
name='category-detail'),
])
urlpatterns += [
url(r'^api-auth/', include('rest_framework.urls',
namespace='rest_framework')),
]
views.py :-
from rest_framework import permissions
from rest_framework import viewsets
from .models import Category
from .serializers import CategorySerializer
class CategoryViewSet(viewsets.ModelViewSet):
queryset = Category.objects.all()
serializer_class = CategorySerializer
permission_classes = (permissions.IsAuthenticatedorReadOnly,)
The simplest way to create revisions is to use reversion.middleware.RevisionMiddleware. This will automatically wrap every request in a revision, ensuring that all changes to your models will be added to their version history.
To enable the revision middleware, simply add it to your MIDDLEWARE_CLASSES setting as follows:
MIDDLEWARE_CLASSES = (
'reversion.middleware.RevisionMiddleware',
# Other middleware goes here...
)
Any thing more complex with this will require adding API calls through your code in away that wraps specific save calls in ways that you decide.
admin.py
from django.contrib import admin
from.models import Category
import reversion
class BaseReversionAdmin(reversion.VersionAdmin):
pass
admin.site.register(Category, BaseReversionAdmin)
also added reversion to installed_apps and middlewareclasses.
Finally i could see the "recover deleted objects button".
I discovered that since rest_framework.viewsets.ModelViewSet inherits from django.views.generic.View so you can also use the reversion.views.RevisionMixin to create revisions instead of having to use the middleware if you want.
From the question above this would look like the following:
from rest_framework import permissions
from rest_framework import viewsets
from .models import Category
from .serializers import CategorySerializer
from reversion.views import RevisionMixin
class CategoryViewSet(RevisionMixin, viewsets.ModelViewSet):
queryset = Category.objects.all()
serializer_class = CategorySerializer
permission_classes = (permissions.IsAuthenticatedorReadOnly,)
You can read more about the specifics of how you can use RevisionMixin here: https://django-reversion.readthedocs.io/en/stable/views.html#reversion-views-revisionmixin