run update_resource inside a transaction to avoid autosaving relationships through assign_attributes when the record is invalid #7437
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A copy of #6202, to not let it be forgotten.
Fixes #5430
When submitting a form with invalid attributes, some associations are autosaved via assign_attributes before calling save_resource. As a consequence, when updating a resource, the user sees a validation error and is not aware that the changes to the associations got persisted.
This PR runs the code inside the update_resource method in an ActiveRecord::Transaction so that everything is rolled back when the model is not valid.