Re: How to fix TypeError: __init__() missing 1 required positional argument: 'on_delete'

[Abba Haruna]

thank you

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Re: How to fix TypeError: __init__() missing 1 required positional argument: 'on_delete'

[Jason]

on_delete is a required parameter now in django 2.0

https://docs.djangoproject.com/en/2.0/releases/2.0/#features-removed-in-2-0


   - The on_delete argument for ForeignKey and OneToOneField is now 
   required in models and migrations. Consider squashing migrations so that 
   you have fewer of them to update.

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Re: How to fix TypeError: __init__() missing 1 required positional argument: 'on_delete'

[vineeth sagar]

For a foreign keys you have to specify an on_delete attribute,

food=models.ForiegnKey(Food,on_delete=models.CASCADE)

If a row in the parent table(food for example) is deleted this will cause
the row/s that refers to that particular food item in your Restraunt model
be deleted.

on_delete can be given other options as SET_NULL,DO_NOTHING. Refer the docs
they are extensive on this topic.

On Nov 23, 2018 1:20 AM, "Abba Haruna"  wrote:

> from django.db import models
>
> class Food(models.Model):
> name = models.CharField(max_length=30)
> picture = models.ImageField(upload_to='images/', null=True)
> def __unicode__(self):
> return self.name
> class Town(models.Model):
> name = models.CharField(max_length=30)
>
> def __unicode__(self):
> return self.name
> class Restaurant(models.Model):
> name = models.CharField(max_length=100)
> desc = models.CharField(max_length=100)
> menu = models.CharField(max_length=100)
> web = models.CharField(max_length=100)
> phone = models.CharField(max_length=40)
> address = models.CharField(max_length=100)
> post_code = models.CharField(max_length=20)
> picture = models.ImageField(upload_to='images/', null=True)
> map = models.ImageField(upload_to='images/', null=True)
> gmap_url = models.CharField(max_length=200, null=True)
> food = models.ForeignKey(Food)
> town = models.ForeignKey(Town)
> STARS = ((1,'one'),
> (2,'two'),
> (3,'three'),
> (4,'four'),)
> votes = models.IntegerField(choices=STARS, default=4)
> def __unicode__(self):
> return self.name
> def __str__(self):
>
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How to fix TypeError: __init__() missing 1 required positional argument: 'on_delete'

[Abba Haruna]

from django.db import models

class Food(models.Model):
name = models.CharField(max_length=30)
picture = models.ImageField(upload_to='images/', null=True)
def __unicode__(self):
return self.name
class Town(models.Model):
name = models.CharField(max_length=30)

def __unicode__(self):
return self.name
class Restaurant(models.Model):
name = models.CharField(max_length=100)
desc = models.CharField(max_length=100)
menu = models.CharField(max_length=100)
web = models.CharField(max_length=100)
phone = models.CharField(max_length=40)
address = models.CharField(max_length=100)
post_code = models.CharField(max_length=20)
picture = models.ImageField(upload_to='images/', null=True)
map = models.ImageField(upload_to='images/', null=True)
gmap_url = models.CharField(max_length=200, null=True)
food = models.ForeignKey(Food)
town = models.ForeignKey(Town)
STARS = ((1,'one'),
(2,'two'),
(3,'three'),
(4,'four'),)
votes = models.IntegerField(choices=STARS, default=4)
def __unicode__(self):
return self.name
def __str__(self):

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