django1/django/contrib/postgres/forms/hstore.py

60 lines
1.7 KiB
Python

import json
from django import forms
from django.core.exceptions import ValidationError
from django.utils.translation import gettext_lazy as _
__all__ = ["HStoreField"]
class HStoreField(forms.CharField):
"""
A field for HStore data which accepts dictionary JSON input.
"""
widget = forms.Textarea
default_error_messages = {
"invalid_json": _("Could not load JSON data."),
"invalid_format": _("Input must be a JSON dictionary."),
}
def prepare_value(self, value):
if isinstance(value, dict):
return json.dumps(value)
return value
def to_python(self, value):
if not value:
return {}
if not isinstance(value, dict):
try:
value = json.loads(value)
except json.JSONDecodeError:
raise ValidationError(
self.error_messages["invalid_json"],
code="invalid_json",
)
if not isinstance(value, dict):
raise ValidationError(
self.error_messages["invalid_format"],
code="invalid_format",
)
# Cast everything to strings for ease.
for key, val in value.items():
if val is not None:
val = str(val)
value[key] = val
return value
def has_changed(self, initial, data):
"""
Return True if data differs from initial.
"""
# For purposes of seeing whether something has changed, None is
# the same as an empty dict, if the data or initial value we get
# is None, replace it w/ {}.
initial_value = self.to_python(initial)
return super().has_changed(initial_value, data)