django.db.utils.IntegrityError: UNIQUE constraint failed: rango_category__new.slug

Question

I'm learning Django from Tango with Django but I keep getting this error when I type:

python manage.py makemigrations rango
python manage.py migrate

This is the output:

django.db.utils.IntegrityError: UNIQUE constraint failed: rango_category__new.slug

Models.py:

from django.db import models
from django.template.defaultfilters import slugify

class Category(models.Model):
    name = models.CharField(max_length=128, unique=True)
    views = models.IntegerField(default=0)
    likes = models.IntegerField(default=0)
    slug = models.SlugField(unique=True)

    def save(self, *args, **kwargs):
        self.slug = slugify(self.name)
        super(Category, self).save(*args, **kwargs)

    def __unicode__(self):
        return self.name


class Page(models.Model):
    category = models.ForeignKey(Category)
    title = models.CharField(max_length=128)
    url = models.URLField()
    views = models.IntegerField(default=0)

    def __unicode__(self):
        return self.title

Answer 1

The reason for this constrain could be that you didn't have any field called slug in Category class when you have initially migrated it (First Migration), and after adding this field in the model, when you ran makemigrations, you have set default value to something static value(i.e None or '' etc), and which broke the unique constrain for the Category's table's slug column in which slug should be unique but it isn't because all the entry will get that default value.

To solve this, you can either drop the database and migration files and re-run makemigrations and migrate or set a unique default value like this:

slug = models.SlugField(unique=True, default=uuid.uuid1)

Edit:

According to Migrations that add unique fields, modify your migration file to overcome unique constrain. For example, modify your migration file (which added the slug field to the model) like this:

import uuid
from app.models import Category  # where app == tango_app_name

class Migration(migrations.Migration):

    dependencies = [
        ('yourproject', '0003_remove_category_slug'),
    ]

    def gen_uuid(apps, schema_editor):
        for row in Category.objects.all():
            row.slug = uuid.uuid4()
            row.save()

    operations = [
        migrations.AddField(
            model_name='category',
            name='slug',
            field=models.SlugField(default=uuid.uuid4),
            preserve_default=True,
        ),
        migrations.RunPython(gen_uuid),

        migrations.AlterField(
            model_name='category',
            name='slug',
            field=models.SlugField(default=uuid.uuid4, unique=True),
        ),
    ]

Answer 2

I got a field with attribute unique, which was not unique [eg 2-time same value]

python3 manage.py migrate --fake

then

python3 manage.py makemigrations

python3 manage.py migrate

this did the trick

Answer 3

This means a slug should be unique. You may have some data in your model. You need to delete all the data in that model and you need to migrate again.

In this situation, you have two ways to fix the error;

1. You need to delete it from the Django admin site. More often than not, it may give an error when you are trying to open the model.

2. Open command prompt

move to project -> py manage.py shell -> from yourappname.models import modelname -> modelname.objects.delete()

Here if you define a product manager for your model. Then you have to define a delete function. Later you should makemigrate, migrate and continue with the second way

Answer 4

I had the same problem and tried all the suggested answers. What finally worked for me was, after I defined the slug field as a URL in models, and ran the makemigrations. I edited the file in makemigrations adding a random number at the end of a basic URL, like this

Generated by Django 3.2.3 on 2022-02-02 20:58

from django.db import migrations, models from random import randint

class Migration(migrations.Migration):

dependencies = [
    ('blog', '0002_remove_post_slug1'),
]

operations = [
    migrations.AddField(
        model_name='post',
        name='slug',
        field=models.URLField(blank=True, default='http:/salpimientapa.com/' + str(randint(100000,999999))),
    ),
]

After I ran python manage.py migrate

I edit the slug as a SlugModel and ran the makemigrations and migrate again