How to create a Django model with a SlugField and unique_for_date option



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To create a Django model with a SlugField and unique_for_date option, you need to specify the date field for which the slug should be unique within. Here's how you can do it:

python
from django.db import models

class YourModel(models.Model):
    # Define other fields of your model here

    # Define the date field for which the slug should be unique
    date_field = models.DateField()

    # Define SlugField with unique_for_date option
    slug = models.SlugField(unique_for_date='date_field', max_length=255)

    def __str__(self):
        return self.slug

In this example:

  • We define a model class named YourModel inheriting from models.Model.
  • We define a DateField named date_field. This field is the reference date for uniqueness.
  • We define a SlugField named slug with the unique_for_date option set to 'date_field'. This ensures that the slug for each instance of YourModel is unique for the date specified in date_field.
  • We can also set max_length to limit the length of the slug.
  • The __str__ method returns a string representation of the model instance, which in this case is the slug.

With this setup, Django will enforce uniqueness for the slug field within the specified date. If you attempt to create or update a model instance with a non-unique slug value for a particular date, Django will raise a django.db.utils.IntegrityError.

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