aj07mm · June 25, 2020 16:21 · Jun 25, 2020
diff --git a/readwriteserializermethodfield.py b/readwriteserializermethodfield.py
@@ -0,0 +1,32 @@
+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 }