Suggestion about the behavior of the get_value method in the Serializer class.

[hanlsin]

source in Field class is described as 'The name of the attribute that will be used to populate the field.' However, couldn't it be generalized for broader use?

Currently, get_value in Serializer and Field class retrieves the value from the dictionary using only field_name as the key, but if source is specified and differs from field_name, it seems like using source as the key to find the value would be a good approach.

    def get_value(self, dictionary):
        ...
        return dictionary.get(self.source, empty)

For example,

class SampleSubSerializer(serializers.Serializer):
    one_item = serializers.CharField(source="1_item")

class SampleSerializer(serializers.Serializer):
    zero_item = serializers.IntegerField(source="0_item")
    one_sub = SampleSubSerializer(source="1_sub")

s = SampleSerializer(data={"0_item": 1, "1_sub": {"1_item": "xyz"}})
s.is_valid(raise_exception=True)
zero_item = s.validated_data["0_item"]

Overriding the get_value method, of course, could be straightforward to support this functionality.
However, I wonder if supporting this as the default behavior might be a more user-friendly approach.

Are there any potential issues with using it this way?