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):

[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.

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[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.

[Abba Haruna]

thank you