58 lines
2.3 KiB
Python
58 lines
2.3 KiB
Python
from rest_framework import serializers
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class BaseSerializer(serializers.ModelSerializer):
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id = serializers.PrimaryKeyRelatedField(read_only=True)
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class DynamicBaseSerializer(BaseSerializer):
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def __init__(self, *args, **kwargs):
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# If 'fields' is provided in the arguments, remove it and store it separately.
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# This is done so as not to pass this custom argument up to the superclass.
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fields = kwargs.pop("fields", None)
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# Call the initialization of the superclass.
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super().__init__(*args, **kwargs)
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# If 'fields' was provided, filter the fields of the serializer accordingly.
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if fields is not None:
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self.fields = self._filter_fields(fields)
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def _filter_fields(self, fields):
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"""
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Adjust the serializer's fields based on the provided 'fields' list.
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:param fields: List or dictionary specifying which fields to include in the serializer.
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:return: The updated fields for the serializer.
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"""
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# Check each field_name in the provided fields.
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for field_name in fields:
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# If the field is a dictionary (indicating nested fields),
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# loop through its keys and values.
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if isinstance(field_name, dict):
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for key, value in field_name.items():
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# If the value of this nested field is a list,
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# perform a recursive filter on it.
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if isinstance(value, list):
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self._filter_fields(self.fields[key], value)
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# Create a list to store allowed fields.
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allowed = []
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for item in fields:
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# If the item is a string, it directly represents a field's name.
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if isinstance(item, str):
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allowed.append(item)
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# If the item is a dictionary, it represents a nested field.
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# Add the key of this dictionary to the allowed list.
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elif isinstance(item, dict):
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allowed.append(list(item.keys())[0])
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# Convert the current serializer's fields and the allowed fields to sets.
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existing = set(self.fields)
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allowed = set(allowed)
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# Remove fields from the serializer that aren't in the 'allowed' list.
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for field_name in (existing - allowed):
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self.fields.pop(field_name)
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return self.fields
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