DRY

src/documents/serialisers.py

@@ -495,20 +495,6 @@ class StoragePathField(serializers.PrimaryKeyRelatedField):
         return StoragePath.objects.all()
 
 
-class ReadWriteSerializerMethodField(serializers.SerializerMethodField):
-    """
-    Based on https://stackoverflow.com/a/62579804
-    """
-
-    def __init__(self, method_name=None, *args, **kwargs):
-        self.method_name = method_name
-        kwargs["source"] = "*"
-        super(serializers.SerializerMethodField, self).__init__(*args, **kwargs)
-
-    def to_internal_value(self, data):
-        return {self.field_name: data}
-
-
 class CustomFieldSerializer(serializers.ModelSerializer):
     def __init__(self, *args, **kwargs):
         context = kwargs.get("context")
@@ -526,8 +512,6 @@ class CustomFieldSerializer(serializers.ModelSerializer):
 
     document_count = serializers.IntegerField(read_only=True)
 
-    extra_data = ReadWriteSerializerMethodField(required=False)
-
     class Meta:
         model = CustomField
         fields = [
@@ -569,36 +553,15 @@ class CustomFieldSerializer(serializers.ModelSerializer):
                 or "select_options" not in attrs["extra_data"]
                 or not isinstance(attrs["extra_data"]["select_options"], list)
                 or len(attrs["extra_data"]["select_options"]) == 0
-                or (
+                or not all(
-                    # version 6 and below require a list of strings
-                    self.api_version < 7
-                    and not all(
-                        len(option) > 0
-                        for option in attrs["extra_data"]["select_options"]
-                    )
-                )
-                or (
-                    # version 7 and above require a list of objects with labels
-                    self.api_version >= 7
-                    and not all(
                     len(option.get("label", "")) > 0
                     for option in attrs["extra_data"]["select_options"]
                 )
-                )
             ):
                 raise serializers.ValidationError(
                     {"error": "extra_data.select_options must be a valid list"},
                 )
             # labels are valid, generate ids if not present
-            if self.api_version < 7:
-                attrs["extra_data"]["select_options"] = [
-                    {
-                        "label": option,
-                        "id": get_random_string(length=16),
-                    }
-                    for option in attrs["extra_data"]["select_options"]
-                ]
-            else:
             for option in attrs["extra_data"]["select_options"]:
                 if option.get("id") is None:
                     option["id"] = get_random_string(length=16)
@@ -621,14 +584,51 @@ class CustomFieldSerializer(serializers.ModelSerializer):
             )
         return super().validate(attrs)
 
-    def get_extra_data(self, obj):
+    def to_internal_value(self, data):
-        extra_data = obj.extra_data
+        ret = super().to_internal_value(data)
-        if self.api_version < 7 and obj.data_type == CustomField.FieldDataType.SELECT:
+
-            # Convert the select options with ids to a list of strings
+        if (
-            extra_data["select_options"] = [
+            self.api_version < 7
-                option["label"] for option in extra_data["select_options"]
+            and ret.get("data_type", "") == CustomField.FieldDataType.SELECT
+            and isinstance(ret.get("extra_data", {}).get("select_options"), list)
+        ):
+            ret["extra_data"]["select_options"] = [
+                {
+                    "label": option,
+                    "id": get_random_string(length=16),
+                }
+                for option in ret["extra_data"]["select_options"]
             ]
-        return serializers.JSONField().to_representation(extra_data)
+
+        return ret
+
+    def to_representation(self, instance):
+        ret = super().to_representation(instance)
+
+        if (
+            self.api_version < 7
+            and instance.data_type == CustomField.FieldDataType.SELECT
+        ):
+            # Convert the select options with ids to a list of strings
+            ret["extra_data"]["select_options"] = [
+                option["label"] for option in ret["extra_data"]["select_options"]
+            ]
+
+        return ret
+
+
+class ReadWriteSerializerMethodField(serializers.SerializerMethodField):
+    """
+    Based on https://stackoverflow.com/a/62579804
+    """
+
+    def __init__(self, method_name=None, *args, **kwargs):
+        self.method_name = method_name
+        kwargs["source"] = "*"
+        super(serializers.SerializerMethodField, self).__init__(*args, **kwargs)
+
+    def to_internal_value(self, data):
+        return {self.field_name: data}
 
 
 class CustomFieldInstanceSerializer(serializers.ModelSerializer):
@@ -659,21 +659,6 @@ class CustomFieldInstanceSerializer(serializers.ModelSerializer):
         return instance
 
     def get_value(self, obj: CustomFieldInstance):
-        api_version = int(
-            self.context.get("request").version
-            if self.context.get("request")
-            else settings.REST_FRAMEWORK["DEFAULT_VERSION"],
-        )
-        if api_version < 7 and obj.field.data_type == CustomField.FieldDataType.SELECT:
-            # return the index of the option in the field.extra_data["select_options"] list
-            return next(
-                (
-                    idx
-                    for idx, option in enumerate(obj.field.extra_data["select_options"])
-                    if option["id"] == obj.value
-                ),
-                None,
-            )
         return obj.value
 
     def validate(self, data):
@@ -686,11 +671,6 @@ class CustomFieldInstanceSerializer(serializers.ModelSerializer):
         """
         data = super().validate(data)
         field: CustomField = data["field"]
-        api_version = int(
-            self.context.get("request").version
-            if self.context.get("request")
-            else settings.REST_FRAMEWORK["DEFAULT_VERSION"],
-        )
 
         if "value" in data and data["value"] is not None:
             if (
@@ -720,13 +700,6 @@ class CustomFieldInstanceSerializer(serializers.ModelSerializer):
             elif field.data_type == CustomField.FieldDataType.SELECT:
                 select_options = field.extra_data["select_options"]
 
-                if api_version < 7:
-                    # Convert the index of the option in the field.extra_data["select_options"]
-                    # list to the options unique id
-                    data["value"] = field.extra_data["select_options"][data["value"]][
-                        "id"
-                    ]
-
                 try:
                     next(
                         option
@@ -752,6 +725,53 @@ class CustomFieldInstanceSerializer(serializers.ModelSerializer):
 
         return data
 
+    def to_internal_value(self, data):
+        ret = super().to_internal_value(data)
+
+        api_version = int(
+            self.context.get("request").version
+            if self.context.get("request")
+            else settings.REST_FRAMEWORK["DEFAULT_VERSION"],
+        )
+        if (
+            api_version < 7
+            and ret.get("field").data_type == CustomField.FieldDataType.SELECT
+            and ret.get("value") is not None
+        ):
+            # Convert the index of the option in the field.extra_data["select_options"]
+            # list to the options unique id
+            ret["value"] = ret.get("field").extra_data["select_options"][ret["value"]][
+                "id"
+            ]
+
+        return ret
+
+    def to_representation(self, instance):
+        ret = super().to_representation(instance)
+
+        api_version = int(
+            self.context.get("request").version
+            if self.context.get("request")
+            else settings.REST_FRAMEWORK["DEFAULT_VERSION"],
+        )
+        if (
+            api_version < 7
+            and instance.field.data_type == CustomField.FieldDataType.SELECT
+        ):
+            # return the index of the option in the field.extra_data["select_options"] list
+            ret["value"] = next(
+                (
+                    idx
+                    for idx, option in enumerate(
+                        instance.field.extra_data["select_options"],
+                    )
+                    if option["id"] == instance.value
+                ),
+                None,
+            )
+
+        return ret
+
     def reflect_doclinks(
         self,
         document: Document,

src/documents/tests/test_api_custom_fields.py

@@ -249,7 +249,8 @@ class TestCustomFieldsAPI(DirectoriesMixin, APITestCase):
 
         resp = self.client.patch(
             f"{self.ENDPOINT}{custom_field_select.id}/",
-            json.dumps(
+            headers={"Accept": "application/json; version=7"},
+            data=json.dumps(
                 {
                     "extra_data": {
                         "select_options": [

src/documents/views.py

@@ -2065,10 +2065,6 @@ class CustomFieldViewSet(ModelViewSet):
             )
         )
 
-    def get_serializer(self, *args, **kwargs):
-        kwargs.setdefault("context", self.get_serializer_context())
-        return super().get_serializer(*args, **kwargs)
-
 
 class SystemStatusView(PassUserMixin):
     permission_classes = (IsAuthenticated,)