🐛 Fix #295 , 500 server errors on POST to sequencing-centers.

[fiendish]

Fixes #295 , 500 server errors on POST to sequencing-centers.
See marshmallow-code/flask-marshmallow#44

[dankolbman]

What was the error being thrown here? Can it be reproduced + tested?

[fiendish]

Both sides of the error are described in #295
But to reproduce you can throw curl -XPOST -H "Content-Type: application/json" http://kf-api-dataservice-qa.kids-first.io/sequencing-centers -d '{"kf_id": "SC_K52V7463", "name": "Washington University"}' into your terminal and see the error come back.

[dankolbman]

Hmm ok, I'm guessing this is due to the fact that it needs to make a query in the serializer to ensure that the name is unique

[dankolbman]

💯
Remember to rebase on master manually first before merging.

[znatty22]

I was able to reproduce it locally. So we may want to hold off on merging this PR and make another PR to address the larger problem. I've confirmed that this happens any time you try to POST any entity with a given kf_id. Also, not sure about this but I think we may need to add in some validation on kf_ids (ensuring that the correct prefixes exist depending on the entity). We may as well do that all in one PR

[dankolbman]

I see. Looks like maybe we wanted to include a kf_id for dump only in the base schema: https://github.com/kids-first/kf-api-dataservice/blob/master/dataservice/api/common/schemas.py#L23

We may want to change this, though, for #293 and #294

[dankolbman]

#308 is a general fix for this problem.

[dankolbman]

Fixed by #308