Validation problem: `parent` isn't set for nested serializer's fields on the validation stage

[ruscoder]

I had found a problem on the validation stage when I used UniqueValidator for nested serializer's field.
I've found the root of the problem - parent isn't set on the validation stage.

[cjroth]

Same as #28

[cjroth]

I believe this fixes it: #29

[ruscoder]

@cjroth #29 is connected to one-to-one relations only. This issue relates to the more common problem and only on the validation stage.

[ruscoder]

http://www.django-rest-framework.org/api-guide/validators/#updating-nested-serializers

[ruscoder]

Now we are working on a workaround for this issue

[ruscoder]

There is an example how to get a workaround:
https://github.com/beda-software/drf-writable-nested#validation-problem-for-nested-serializers-with-unique-fields-on-update

[dz0]

but DRF also proposes way to deal with bulk updates by explicitly including id field (as not read_only)
http://www.django-rest-framework.org/api-guide/serializers/#customizing-multiple-update

this way, one get instance from id

ps.: in my case I had custom kind of uniqueness validation (checked if objects not overlap), so I excluded current instance by id in my validation query.

[pmontu]

Would UniqueFieldsMixin move validations of unique_together as well?