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To retrieve the names of fields in a Django UniqueConstraint, you can use the .fields attribute of the constraint object. For example, if you have a model with a UniqueConstraint and you want to retrieve the fields that are part of the constraint, you can do the following:

from django.db import models

class MyModel(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.CharField(max_length=100)

    class Meta:
        constraints = [models.UniqueConstraint(fields=['field1', 'field2'], name='unique_constraint')]

# Retrieving the fields of the UniqueConstraint
unique_constraint = MyModel._meta.get_constraint_by_name('unique_constraint')
fields = unique_constraint.fields

# fields should contain ('field1', 'field2')
print(fields)

This will output ('field1', 'field2'), which are the fields that are part of the UniqueConstraint.