73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
# Copyright (c) 2015 Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from muranodashboard.common import widgets
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from django.core.exceptions import ValidationError
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from django.core import validators
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from django import forms
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from django.utils.translation import gettext_lazy as _
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class TriStateMultipleChoiceField(forms.ChoiceField):
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"""A multiple choice checkbox field where checkboxes has three states.
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States are:
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- Checked
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- Unchecked
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- Indeterminate
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It takes a ``dict`` instance as a value,
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where keys are internal values from `choices`
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and values are ones from following (in order respectively to states):
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- True
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- False
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- None
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"""
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widget = widgets.TriStateCheckboxSelectMultiple
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default_error_messages = {
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'invalid_choice': _('Select a valid choice. %(value)s is not one '
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'of the available choices.'),
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'invalid_value': _('Enter a dict with choices and values. '
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'Got %(value)s.'),
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}
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def to_python(self, value):
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"""Checks if value, that comes from widget, is a dict."""
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if value in validators.EMPTY_VALUES:
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return {}
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elif not isinstance(value, dict):
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raise ValidationError(self.error_messages['invalid_value'],
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code='invalid_value')
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return value
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def validate(self, value):
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"""Ensures that value has only allowed values."""
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if not set(value.keys()) <= {k for k, _ in self.choices}:
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raise ValidationError(
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self.error_messages['invalid_choice'],
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code='invalid_choice',
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params={'value': value},
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)
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elif not (set(value.values()) <=
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set(widgets.TriStateCheckboxSelectMultiple
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.VALUES_MAP.values())):
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raise ValidationError(
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self.error_messages['invalid_value'],
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code='invalid_value',
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params={'value': value},
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)
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