604d6edef0
This field is needed because the plain JSONField does not permit empty arrays - [] - or empty objects - {} - when the field is marked as required. Those values explicitly evaluate to a null value, and are rejected.
Instead, the IETFJSONField accepts two new arguments to control this:
- empty_values: An array of values that should evaluate to null/empty, and be rejected.
- accepted_empty_values: An array of values that should *not* evaluate to null/empty, and be accepted.
This allows the programmer to specify either a positive or negative statement of what values to accept.
Fixes issue #3331. Commit ready for merge.
- Legacy-Id: 19401
29 lines
1.1 KiB
Python
29 lines
1.1 KiB
Python
# Copyright The IETF Trust 2021, All Rights Reserved
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# -*- coding: utf-8 -*-
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# Taken from/inspired by
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# https://stackoverflow.com/questions/55147169/django-admin-jsonfield-default-empty-dict-wont-save-in-admin
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#
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# JSONField should recognize {}, (), and [] as valid, non-empty JSON
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# values. However, the base Field class excludes them
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import jsonfield
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from ietf.utils.fields import IETFJSONField as FormIETFJSONField
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class IETFJSONField(jsonfield.JSONField):
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form_class = FormIETFJSONField
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def __init__(self, *args, empty_values=FormIETFJSONField.empty_values, accepted_empty_values=None, **kwargs):
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if accepted_empty_values is None:
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accepted_empty_values = []
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self.empty_values = [x
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for x in empty_values
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if x not in accepted_empty_values]
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super().__init__(*args, **kwargs)
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def formfield(self, **kwargs):
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if issubclass(kwargs['form_class'], FormIETFJSONField):
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kwargs.setdefault('empty_values', self.empty_values)
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return super().formfield(**{**kwargs})
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