[Django] #23770: float("inf") as an argument to a validator breaks migrations

[Django]

#23770: float("inf") as an argument to a validator breaks migrations
----------------------------+--------------------
     Reporter:  w0rp        |      Owner:  nobody
         Type:  Bug         |     Status:  new
    Component:  Migrations  |    Version:  1.7
     Severity:  Normal      |   Keywords:
 Triage Stage:  Unreviewed  |  Has patch:  0
Easy pickings:  0           |      UI/UX:  0
----------------------------+--------------------
 Deconstructing {{{float("inf")}}} in validator arguments breaks
 migrations, probably because {{{repr(float("inf")) == "inf"}}}. A similar
 issue will exist for {{{float("nan")}}}.

 To reproduce this, you'll need a validator using deconstructible.

 {{{#!python
 from django.utils.deconstruct import deconstructible

 @deconstructible
 class DoNothingValidator (object):
     def __init__(self, foo):
         self.foo = foo

     def __call__(self, value):
         pass

     def __eq__(self, other):
         return type(self) == type(other) \
         and self.foo == other.foo
 }}}

 Now you'll need to pass the validator with float("inf") to a field.

 {{{#!python
 class SomeModel (Model):
     some_field = IntegerField(
         validators= [DoNothingValidator(float("inf"))],
     )
 }}}

 Now if you run 'makemigrations', you will get output like the following.

 {{{#!python
 ...
 ('some_field',
 models.IntegerField(validators=[some.path.DoNothingValidator(inf)])),
 ...
 }}}

 The {{{inf}}} above will cause a NameError when you attempt to migrate, or
 when you create further migrations with 'makemigrations' again.

--
Ticket URL: <https://code.djangoproject.com/ticket/23770>
Django <https://code.djangoproject.com/>
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