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Directory :  /srv/modoboa/env/lib/python3.5/site-packages/django/contrib/postgres/forms/

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Current File : /srv/modoboa/env/lib/python3.5/site-packages/django/contrib/postgres/forms/hstore.py
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)

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