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from django.db import connection, models
from django.test import SimpleTestCase
class CustomFieldTests(SimpleTestCase):
def test_get_prep_value_count(self):
"""
Field values are not prepared twice in get_db_prep_lookup() (#14786).
"""
class NoopField(models.TextField):
def __init__(self, *args, **kwargs):
self.prep_value_count = 0
super(NoopField, self).__init__(*args, **kwargs)
def get_prep_value(self, value):
self.prep_value_count += 1
return super(NoopField, self).get_prep_value(value)
field = NoopField()
field.get_db_prep_lookup('exact', 'TEST', connection=connection, prepared=False)
self.assertEqual(field.prep_value_count, 1)
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