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57 lines
1.7 KiB
Python
57 lines
1.7 KiB
Python
from django.contrib.contenttypes.models import ContentType
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from rest_framework.fields import Field
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from extras.models import CustomField
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#
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# Custom fields
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#
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class CustomFieldDefaultValues:
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"""
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Return a dictionary of all CustomFields assigned to the parent model and their default values.
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"""
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requires_context = True
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def __call__(self, serializer_field):
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self.model = serializer_field.parent.Meta.model
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# Retrieve the CustomFields for the parent model
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content_type = ContentType.objects.get_for_model(self.model)
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fields = CustomField.objects.filter(content_types=content_type)
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# Populate the default value for each CustomField
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value = {}
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for field in fields:
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if field.default is not None:
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value[field.name] = field.default
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else:
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value[field.name] = None
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return value
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class CustomFieldsDataField(Field):
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def _get_custom_fields(self):
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"""
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Cache CustomFields assigned to this model to avoid redundant database queries
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"""
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if not hasattr(self, '_custom_fields'):
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content_type = ContentType.objects.get_for_model(self.parent.Meta.model)
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self._custom_fields = CustomField.objects.filter(content_types=content_type)
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return self._custom_fields
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def to_representation(self, obj):
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return {
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cf.name: obj.get(cf.name) for cf in self._get_custom_fields()
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}
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def to_internal_value(self, data):
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# If updating an existing instance, start with existing custom_field_data
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if self.parent.instance:
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data = {**self.parent.instance.custom_field_data, **data}
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return data
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