ReadWriteSerializerMethodField

readwriteserializermethodfield.py

class ReadWriteSerializerMethodField(serializers.Field):
    def __init__(self, method_name=None, **kwargs):
        self.method_name = method_name
        kwargs['source'] = '*'
        #kwargs['read_only'] = True
        super(ReadWriteSerializerMethodField, self).__init__(**kwargs)

    def bind(self, field_name, parent):
        self.field_name = field_name
        # In order to enforce a consistent style, we error if a redundant
        # 'method_name' argument has been used. For example:
        # my_field = serializer.SerializerMethodField(method_name='get_my_field')
        default_method_name = 'get_{field_name}'.format(field_name=field_name)
        assert self.method_name != default_method_name, (
            "It is redundant to specify `%s` on SerializerMethodField '%s' in "
            "serializer '%s', because it is the same as the default method name. "
            "Remove the `method_name` argument." %
            (self.method_name, field_name, parent.__class__.__name__)
        )

        # The method name should default to `get_{field_name}`.
        if self.method_name is None:
            self.method_name = default_method_name

        super(ReadWriteSerializerMethodField, self).bind(field_name, parent)

    def to_representation(self, value):
        method = getattr(self.parent, self.method_name)
        return method(value)

    def to_internal_value(self, data):
        return { self.field_name: data }