Fixed one typo in response_helpers which caused is_admin context variable not to work correctly. Created new checkLinkNameForId function that checks if link_name is correct when creating new user and modifying existing one. This is now used for validation instead of doesLinkNameBelongToId in UserForm clean_link_name function. The previous validation function didn't allow to create new users and modify linkname of existing ones. Additionally I created new doesLinkNameExist helper function.

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"""

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39. Empty model tests

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These test that things behave sensibly for the rare corner-case of a model with

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no fields.

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"""

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from django.db import models

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class Empty(models.Model):

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    pass

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__test__ = {'API_TESTS':"""

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>>> m = Empty()

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>>> m.id

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>>> m.save()

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>>> m2 = Empty()

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>>> m2.save()

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>>> len(Empty.objects.all())

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2

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>>> m.id is not None

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True

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>>> existing = Empty(m.id)

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>>> existing.save()

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"""}