I am working on small django project and for that i have created one functionality that allows user to create and then join the group.
Now , here is the problem :
whenever i leave the group and try to rejoin it , it shows error that i mentioned in the the question
"UNIQUE constraint failed: groups_groupmember.group_id, groups_groupmember.user_id"
here is my join class :
class JoinGroup(LoginRequiredMixin, generic.RedirectView):
def get_redirect_url(self, *args, **kwargs):
return reverse('groups:single', kwargs={'slug': self.kwargs.get('slug')})
def get(self, request, *args, **kwargs):
group = get_object_or_404(Group, slug=self.kwargs.get('slug'))
from sqlite3 import IntegrityError
try:
# GroupMember.objects.create(group=group)
GroupMember.objects.create(user=self.request.user, group=group)
except IntegrityError:
messages.warning(self.request, 'already a member!')
else:
messages.success(self.request, 'You are now a member!')
return super().get(request, *args, **kwargs)
Here is my models.py
from django.db import models
from django.utils.text import slugify
from django.urls import reverse
# Create your models here.
# GROUPS MODELS.PY
import markdown
from django.contrib.auth import get_user_model # returns user model that currently active in this project
User = get_user_model()
from django import template
register = template.Library()
class Group(models.Model):
name = models.CharField(max_length=256, unique=True)
slug = models.SlugField(allow_unicode=True, unique=True)
description = models.TextField(blank=True, default='')
description_html = models.TextField(editable=False, default='', blank=True)
members = models.ManyToManyField(User, through='GroupMember')
def __str__(self):
return self.name
def save(self, *args, **kwargs):
self.slug = slugify(self.name)
self.description_html = markdown.markdown(self.description)
super().save(*args, **kwargs)
def get_absolute_url(self):
return reverse('groups:single', kwargs={'slug': self.slug})
class Meta:
ordering = ['name']
class GroupMember(models.Model):
group = models.ForeignKey(Group, related_name='memberships', on_delete=models.CASCADE)
user = models.ForeignKey(User, related_name='user_groups', on_delete=models.CASCADE)
def __str__(self):
return self.user.username
class Meta:
unique_together = ('group', 'user')
Can you please help me to solve this problem ? Thank you ! :)
How about use get_or_create
class JoinGroup(LoginRequiredMixin, generic.RedirectView):
def get_redirect_url(self, *args, **kwargs):
return reverse('groups:single', kwargs={'slug': self.kwargs.get('slug')})
def get(self, request, *args, **kwargs):
group = get_object_or_404(Group, slug=self.kwargs.get('slug'))
_, created = GroupMember.objects.create(user=request.user, group=group)
if not created:
messages.warning(request, 'already a member!')
else:
messages.success(request, 'You are now a member!')
return super().get(request, *args, **kwargs)
Related
I can like my products from admin panel,and i want to add posibility to like them by url products/item/like,i have view of like but i dont know what i should add to there.This is my views.py
class LikeToggleView(AjaxResponseMixin, JSONResponseMixin, FormView):
http_method_names = ('post',)
form_class = LikeForm
product = None
#csrf_exempt
def dispatch(self, request, *args, **kwargs):
product_id = kwargs['product_pk']
try:
self.product = Product.objects.get(id=product_id)
except Product.DoesNotExist:
raise Http404()
return super().dispatch(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
pass
this is forms.py
class LikeForm(forms.ModelForm):
user = forms.ModelChoiceField(User.objects.all(), required=False)
product = forms.ModelChoiceField(Product.objects.all())
ip = forms.GenericIPAddressField(required=True)
this is models.py
class Like(TimeStampedModel):
product = models.ForeignKey(Product, related_name='likes')
user = models.ForeignKey(settings.AUTH_USER_MODEL, blank=True, null=True, related_name='likes')
ip = models.GenericIPAddressField(blank=True, null=True)
class Meta:
unique_together = (('product', 'user'), ('product', 'ip'))
def __str__(self):
return '{} from {}'.format(self.product, self.user or self.ip)
My models.py
from django.db import models
from django.contrib.auth.models import User
import datetime
from django.utils import timezone
# Create your models here.
class LiveClass(models.Model):
standard = models.IntegerField()
no_of_students_registered = models.IntegerField(default=0)
class Meta:
verbose_name_plural = 'Class'
def __str__(self):
return str(self.standard) + ' class'
class User_details(models.Model):
name = models.OneToOneField(User, on_delete = models.CASCADE, max_length=30)
standard = models.IntegerField(default=0)
email = models.EmailField()
mobile_number = models.IntegerField()
class Meta:
verbose_name_plural = 'User_details'
def __str__(self):
return str(self.name)
class Mentor(models.Model):
name = models.CharField(max_length=30)
details = models.TextField()
ratings = models.FloatField(default=2.5)
class Meta:
verbose_name_plural = 'Mentors'
def __str__(self):
return self.name
class LiveClass_details(models.Model):
standard = models.ForeignKey(LiveClass, on_delete=models.CASCADE)
chapter_name = models.CharField(max_length=30)
chapter_details = models.TextField()
mentor_name = models.ForeignKey(Mentor, max_length=30, on_delete=models.CASCADE)
class_time = models.DateTimeField()
end_time = models.DateTimeField(default=timezone.now())
isDoubtClass = models.BooleanField(default=False)
doubtsAddressed = models.IntegerField(default=0)
class Meta:
verbose_name_plural = 'LiveClass_details'
def __str__(self):
return self.chapter_name
class SavedClass(models.Model):
class_details = models.ForeignKey(LiveClass_details, on_delete=models.CASCADE)
user = models.ForeignKey(User, on_delete=models.CASCADE)
is_registered = models.BooleanField(default=False)
is_attended = models.BooleanField(default=False)
class Meta:
verbose_name_plural = 'SavedClasses'
def __str__(self):
return 'SavedClass : ' + str(self.class_details)
my views.py
from django.shortcuts import render
from rest_framework import mixins
from rest_framework import generics
from django.contrib.auth.mixins import LoginRequiredMixin
from rest_framework import status
from django.contrib.auth.models import User
from rest_framework.response import Response
from django.contrib.auth import authenticate
from . import serializers
from . import models
# Create your views here.
class ListLiveClass(mixins.ListModelMixin, LoginRequiredMixin, generics.GenericAPIView):
queryset = models.LiveClass_details.objects.all()
serializer_class = serializers.LiveClass_details_serializer
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
class LiveClassView(mixins.ListModelMixin,
mixins.CreateModelMixin,
LoginRequiredMixin,
generics.GenericAPIView):
queryset = models.LiveClass_details.objects.all()
serializer_class = serializers.LiveClass_details_serializer
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
def post(self, request, *args, **kwargs):
if request.user.is_superuser:
return self.create(request, *args, **kwargs)
else:
return Response(status=status.HTTP_403_FORBIDDEN)
class LiveClassViewId(mixins.RetrieveModelMixin,
mixins.UpdateModelMixin,
mixins.DestroyModelMixin,
LoginRequiredMixin,
generics.GenericAPIView):
queryset = models.LiveClass_details.objects.all()
serializer_class = serializers.LiveClass_details_serializer
lookup_field = 'id'
def get(self, request, id=None, format=None):
if id:
return self.retrieve(request)
else:
return Response(status=status.HTTP_400_BAD_REQUEST)
def put(self, request, id, format=None):
if request.user.is_superuser:
return self.update(request, id)
else:
return Response(status=status.HTTP_403_FORBIDDEN)
def delete(self, request, id, format=None):
if request.user.is_superuser:
return self.destroy(request, id)
else:
return Response(status=status.HTTP_403_FORBIDDEN)
class ListMentors(mixins.ListModelMixin, LoginRequiredMixin, generics.GenericAPIView):
queryset = models.Mentor.objects.all()
serializer_class = serializers.Mentor_serializer
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
class ListUserDetails(mixins.ListModelMixin, LoginRequiredMixin, generics.GenericAPIView):
queryset = models.User_details.objects.all()
serializer_class = serializers.User_details_serializer
def get(self, request, *args, **kwargs):
return self.list(request, *args, **kwargs)
#api endpoints to save and register live classes
class SavedClassView(LoginRequiredMixin, mixins.ListModelMixin, mixins.CreateModelMixin, mixins.DestroyModelMixin, generics.GenericAPIView):
serializer_class = serializers.SavedClass_serializer
def get_queryset(self):
user = self.request.user
return models.SavedClass.objects.filter(user=self.request.user.id)
def get(self, request):
return self.list(request)
def post(self, request):
cur_user = self.get_object()
#return self.create(request)
return Response(status=status.HTTP_403_FORBIDDEN)
my serializers.py
from rest_framework import serializers
from . import models
class LiveClass_serializer(serializers.ModelSerializer):
class Meta:
model = models.LiveClass
fields = '__all__'
class SavedClass_serializer(serializers.ModelSerializer):
class Meta:
model = models.SavedClass
fields = '__all__'
class User_details_serializer(serializers.ModelSerializer):
saved_class = SavedClass_serializer()
class Meta:
model = models.User_details
fields = '__all__'
class LiveClass_details_serializer(serializers.ModelSerializer):
class Meta:
model = models.LiveClass_details
fields = '__all__'
class Mentor_serializer(serializers.ModelSerializer):
class Meta:
model = models.Mentor
fields = '__all__'
In savedClass view in GET request i am rendering all the savedClass Model wherever user in the model matches with the current user , now in POST request i want to create the savedclass row only for the current user and forbids the user from creating a view with different user id
I also needs help in my SavedClass model where whether a user is registered or not can only be decided by the admin
I tries different possible things but not able to do it, i am new to Django so needs help
You can get the logged in user from request.user so something like this should work
def post(self, request):
cur_user = request.user
if cur_user.id == request.data.user:
return self.create(request)
return Response(status=status.HTTP_403_FORBIDDEN)
assuming that only logged in users can call this api
I am new on this field and i am currently learning django and i come up with this problem. I am working on a project which is a social clone project and this project you can only post when you are in a group and i've encountered this problem when i post. The first post is working fine but the second post i get this error message called IntegrityError i've tried to delete my migrations and database and migrate and makemigrations again but does not fix the problem and now i am stuck and i hope someone will help me. This is the actual error
Posts Models
##########################
## POSTS MODELS.PY FILE ##
##########################
from django.contrib.auth import get_user_model
from django.db import models
from groups.models import Group
from misaka import html
from django.urls import reverse
from django.conf import settings
User = get_user_model()
class Post(models.Model):
user = models.ForeignKey(User, related_name='posts', on_delete=models.CASCADE)
created_at = models.DateTimeField(auto_now=True)
message = models.TextField()
message_html = models.TextField(editable=False)
group = models.ForeignKey(Group, related_name='posts', null=True, blank=True, on_delete=models.CASCADE)
def __str__(self):
return self.message
def save(self, *args, **kwargs):
self.message_html = html(self.message)
super().save(*args, **kwargs)
def get_absolute_url(self):
return reverse(
'posts:single',
kwargs={
'username': self.user.username,
'pk': self.pk
}
)
class Meta:
ordering = ['-created_at']
unique_together = ['user', 'group']
Posts Views.py
#########################
## POSTS VIEWS.PY FILE ##
#########################
from django.contrib.auth import get_user_model
from braces.views import SelectRelatedMixin
from django.views import generic
from posts import models, forms
from django.http import Http404
from django.contrib.auth.mixins import LoginRequiredMixin
from django.urls import reverse_lazy
from django.contrib import messages
User = get_user_model()
class PostList(SelectRelatedMixin, generic.ListView):
model = models.Post
select_related = ('user', 'group')
class UserPost(generic.ListView):
model = models.Post
template_name = 'posts/user_post_list.html'
def get_queryset(self):
try:
self.post_user = User.objects.prefetch_related('posts').get(
username__iexact=self.kwargs.get('username')
)
except User.DoesNotExist:
raise Http404
else:
return self.post_user.posts.all()
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['post_user'] = self.post_user
return context
class PostDetail(SelectRelatedMixin, generic.DetailView):
model = models.Post
select_related = ('user', 'group')
def get_queryset(self):
queryset = super().get_queryset()
return queryset.filter(
user__username__iexact=self.kwargs.get('username')
)
class CreatePost(LoginRequiredMixin, SelectRelatedMixin, generic.CreateView):
model = models.Post
fields = ('message', 'group')
def form_valid(self, form):
self.object = form.save(commit=False)
self.object.user = self.request.user
self.object.save()
return super().form_valid(form)
class DeletePost(LoginRequiredMixin, SelectRelatedMixin, generic.DeleteView):
model = models.Post
select_related = ('user', 'group')
success_url = reverse_lazy('posts:all')
def get_queryset(self):
queryset = super().get_queryset()
return queryset.filter(user_id=self.request.user.id)
def delete(self, *args, **kwargs):
messages.success(self.request, ('Post Delete'))
return super().delete(*args, **kwargs)
Groups Models.py
##########################
## GROUPS VIEWS.PY FILE ##
##########################
from django.contrib.auth import get_user_model
from django import template
from django.db import models
from django.utils.text import slugify
from misaka import html
from django.urls import reverse
from django.conf import settings
User = get_user_model()
register = template.Library()
class Group(models.Model):
name = models.CharField(max_length=255, unique=True)
slug = models.SlugField(allow_unicode=True, unique=True)
description = models.TextField(blank=True, default='')
description_html = models.TextField(editable=False, blank=True, default='')
members = models.ManyToManyField(User, through='GroupMember')
def __str__(self):
return self.name
def save(self, *args, **kwargs):
self.slug = slugify(self.name)
self.description_html = html(self.description)
super().save(*args, **kwargs)
def get_absolute_url(self):
return reverse('groups:single', kwargs={'slug': self.slug})
class Meta:
ordering = ['name']
class GroupMember(models.Model):
group = models.ForeignKey(Group, related_name='memberships', on_delete=models.CASCADE)
user = models.ForeignKey(User, related_name='user_groups', on_delete=models.CASCADE)
def __str__(self):
return self.user.username
class Meta:
unique_together = ('group', 'user')
Groups Views.py
[![##########################
## GROUPS VIEWS.PY FILE ##
##########################
from django.contrib.auth.mixins import LoginRequiredMixin
from django.views import generic
from groups.models import Group, GroupMember
from django.urls import reverse
from django.shortcuts import get_object_or_404
from django.db import IntegrityError
from django.contrib import messages
from groups import models
class CreateGroup(LoginRequiredMixin, generic.CreateView):
model = Group
fields = ('name', 'description')
class SingleGroup(generic.DetailView):
model = Group
class ListGroups(generic.ListView):
model = Group
class JoinGroup(LoginRequiredMixin, generic.RedirectView):
def get_redirect_url(self, *args, **kwargs):
return reverse('groups:single', kwargs={'slug': self.kwargs.get('slug')})
def get(self, request, *args, **kwargs):
group = get_object_or_404(Group, slug=self.kwargs.get('slug'))
try:
GroupMember.objects.create(user=self.request.user, group=group)
except IntegrityError:
messages.warning(self.request, (f'Warning, Already A Member Of {group.name}.'))
else:
messages.success(self.request, (f'You Are Now A Member Of {group.name} Group.'))
return super().get(request, *args, **kwargs)
class LeaveGroup(LoginRequiredMixin, generic.RedirectView):
def get_redirect_url(self, *args, **kwargs):
return reverse('groups:single', kwargs={'slug': self.kwargs.get('slug')})
def get(self, request, *args, **kwargs):
try:
membership = models.GroupMember.objects.filter(
user=self.request.user,
group__slug=self.kwargs.get('slug')
).get()
except models.GroupMember.DoesNotExist:
messages.warning(self.request, ("You Can't Leave This Group Because You Aren't In It."))
else:
membership.delete()
messages.success(self.request, ('You Have Successfully Left This Group.'))
return super().get(request, *args, **kwargs)
Remove unique_together from your Post model. It means that only one Post object can have that particular user and model combination, that is why you are getting the integrity error.
The error which you are getting is all about the unique constraint.
unique_together = ['user', 'group']
Since you have defined in your model the unique_together attribute, you need to have unique rows of the combination for user and group. One user can post only once in a group and you are trying to post in the same group by the same user, that's why you are getting a unique constraint failed error.
I'm still stuck with my issue. So I've found a new way to do it. Better I think Your help will be really appreciate.
path('new/<seller>/', CreateChannelSellerView.as_view(),name="channel_to"),
Assume I got .../new/fredo/ -> fredo is the username of the seller. I want to catch it. But I got an issue:
Exception Type: RelatedObjectDoesNotExist
Exception Value:
Channel has no seller.
Trace:
form.instance.seller.add(existed_seller)
"%s has no %s." % (self.field.model.name, self.field.name)
views.py
class CreateChannelSellerView(CreateView):
model = Channel
form_class = CreateSellerChannelForm
template_name = 'channel_seller_new.html'
def form_valid(self, form):
form.instance.consumer = self.request.user
seller_field = self.kwargs['seller']
current_seller = User.objects.filter(username=seller_field)
if current_seller.count()<1:
raise forms.ValidationError('Username does not exist')
else:
existed_seller = User.objects.get(username=seller_field)
form.instance.seller.add(existed_seller)
form.save()
return super(CreateChannelSellerView, self).form_valid(form)
def get_success_url(self):
return reverse_lazy('channel:channel_home')
models.py
class Channel(models.Model):
consumer = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="channel_consumer", blank=True, null=True)
name = models.CharField(max_length=10)
seller = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="channel_seller")
def save(self, *args, **kwargs):
if not self.slug:
self.slug = unique_slugify(self, slugify(self.name))
super().save(*args, **kwargs)
def __str__(self):
return self.name
forms.py
class CreateSellerChannelForm(forms.ModelForm):
class Meta:
model = Channel
widgets = {
'name':forms.TextInput(attrs={'class':'','style':'','placeholder':'First group'}),
}
fields = [
'name',
]
class Book(models.Model):
description = models.CharField(max_length=10)
pdf = models.FileField(upload_to='books/pdfs/')
user = models.ForeignKey(User, on_delete=models.CASCADE)
def __str__(self):
return self.description
def delete(self, *args, **kwargs):
self.pdf.delete()
super().delete(*args, **kwargs)
#forms.py
class BookForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
self.user = kwargs.pop('user', None)
super(BookForm, self).__init__(*args, **kwargs)
class Meta:
model = Book
fields = ('description', 'pdf', 'user')
When i run an application it shows all the users, I want to restrict to only current user who is logged in.