Re: ManyToMany relationship with through_fields and Admin

What changes you did ?

Regards,
Akash Kandpal.

On Wed, Aug 29, 2018, 12:34 AM Vincent <vincent@minon.be> wrote:

I figured it out :

from django.db import models
from django.contrib.auth.models import User


# Create your models here.
class Events(models.Model):
 Name = models.CharField(max_length=64)
 Date = models.DateTimeField()
 Description = models.CharField(max_length=200)
 Admin = models.ForeignKey(User, models.SET_NULL, blank=True, null=True, related_name='event_admin')
 Status = models.PositiveIntegerField(default=0)
 Attendees = models.ManyToManyField(User, through='Attend',through_fields=('events','attendees'))
 
 def __str__(self):
 return self.Name




class Attend(models.Model):
 events = models.ForeignKey(Events, on_delete=models.CASCADE)
 attendees = models.ForeignKey(User, on_delete=models.CASCADE, related_name='attendees')
 PlusOne = models.ForeignKey(User, on_delete=models.CASCADE, related_name='PlusOne')
 
 class Meta:
 unique_together = (('events', 'attendees'),)

from django.contrib import admin
from .models import Events
from .models import Attend
from django.contrib.auth.models import User




# Register your models here.


class AttendInline(admin.TabularInline):
 model = Attend
 extra = 1


class EventsAdmin(admin.ModelAdmin):
 inlines = [ AttendInline, ]




admin.site.register(Events, EventsAdmin)

Le mardi 28 août 2018 00:44:49 UTC+2, Vincent a écrit :

Hello,

I'm new to Django and i'm trying to made a simple app in which users can attend to an event. I'm trying to have this manageable through the admin site but i get the following error :

<class 'evenement.admin.AttendInline'>: (admin.E202) fk_name 'attendees' is not a ForeignKey to 'evenement.Events'.

My goal is to have an interface to create the event and add users in the event.

Here are my models :

from django.db import models
from django.contrib.auth.models import User


# Create your models here.
class Events(models.Model):
 Name = models.CharField(max_length=64)
 Date = models.DateTimeField()
 Description = models.CharField(max_length=200)
 Admin = models.ForeignKey(User, models.SET_NULL, blank=True, null=True, related_name='event_admin')
 Status = models.PositiveIntegerField(default=0)
 Attendees = models.ManyToManyField(User, through='Attend',through_fields=('events','attendees'))
 
 def __str__(self):
 return self.Name


class Attend(models.Model):
 events = models.ForeignKey(Events, on_delete=models.CASCADE)
 attendees = models.ForeignKey(User, on_delete=models.CASCADE)
 PlusOne = models.ForeignKey(User, on_delete=models.CASCADE, related_name='PlusOne')

And the admin.py

from django.contrib import admin
from .models import Events
from .models import Attend
from django.contrib.auth.models import User




# Register your models here.


class AttendInline(admin.TabularInline):
 model = Attend
 fk_name = "attendees"
 extra = 1


class UserAdmin(admin.ModelAdmin):
 inlines = [ AttendInline, ]


class EventsAdmin(admin.ModelAdmin):
 inlines = [ AttendInline, ]




admin.site.unregister(User)
admin.site.register(User, UserAdmin)


admin.site.register(Events, EventsAdmin)

Your help will be much appreciated !

Thank you

Vincent

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