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63 lines
1.7 KiB
Python
63 lines
1.7 KiB
Python
import json
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from django import forms
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from django.utils.translation import gettext_lazy as _
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__all__ = ['JSONField']
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class InvalidJSONInput(str):
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pass
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class JSONString(str):
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pass
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class JSONField(forms.CharField):
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default_error_messages = {
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'invalid': _('“%(value)s” value must be valid JSON.'),
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}
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widget = forms.Textarea
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def to_python(self, value):
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if self.disabled:
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return value
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if value in self.empty_values:
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return None
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elif isinstance(value, (list, dict, int, float, JSONString)):
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return value
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try:
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converted = json.loads(value)
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except json.JSONDecodeError:
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raise forms.ValidationError(
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self.error_messages['invalid'],
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code='invalid',
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params={'value': value},
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)
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if isinstance(converted, str):
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return JSONString(converted)
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else:
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return converted
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def bound_data(self, data, initial):
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if self.disabled:
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return initial
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try:
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return json.loads(data)
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except json.JSONDecodeError:
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return InvalidJSONInput(data)
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def prepare_value(self, value):
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if isinstance(value, InvalidJSONInput):
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return value
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return json.dumps(value)
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def has_changed(self, initial, data):
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if super().has_changed(initial, data):
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return True
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# For purposes of seeing whether something has changed, True isn't the
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# same as 1 and the order of keys doesn't matter.
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data = self.to_python(data)
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return json.dumps(initial, sort_keys=True) != json.dumps(data, sort_keys=True)
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