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Rescue Errors on Create Mutation Resolver

Julie Huang requested to merge 463135-update-create-endpoint-for-self-hosted-models into master

What does this MR do and why?

Updates error handling on the create mutation resolver for self-hosted models

Context

Currently, errors aren't being handled correctly by the resolver. If record persistence fails due to invalid params (e.g a non-unique name is supplied), an ActiveRecord rollback of the transaction occurs and errors_on_object() won't work (model is nil after the rollback). This MR updates the logic to rescue the error so that it is surfaced correctly to the client.

This MR is cherry-picked from !159043 (closed) in an effort to split that work up into smaller pieces (the original MR will be closed).

Relates to this issue: #463135 (closed)

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Related to #463135 (closed)

Edited by Julie Huang

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