CODEWITHSUNDEEP
djangodjango-models
Luis Angel
Luis Angel

Reputation: 41

Non repeatable fields in models

Is there a directive in models.py that allows me to have a value not repeated in a field? I'm making a table of people and I need the email field not to be repeated.

Upvotes: 1

Views: 118

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 476624

Yes, you can pass unique=True [Django-doc] to that field.

For example:

from django.db import models

class MyModel(models.Model):
    email = models.CharField(max_length=128, unique=True)

As specified in the documentation:

Field.unique

If True, this field must be unique throughout the table.

This is enforced at the database level and by model validation. If you try to save a model with a duplicate value in a unique field, a django.db.IntegrityError will be raised by the model’s save() method.

This option is valid on all field types except ManyToManyField and OneToOneField.

Note that when unique is True, you don’t need to specify db_index, because unique implies the creation of an index.

So here for every two different MyModel objects, we know that their email field will contain a different value.

Upvotes: 2

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