ISSUE-77 HOTFIX Save the resource after processing relationships

[ddobson]

Fixes issue #77 while preserving changes to fk relationships

Test

1. Using a resource with a many-to-many relationship make a single PATCH request to an existing record. The body should update resource attributes and create/change linkages in the resources m2m relationship. Validate the following:

   • django.db.models.Model.save() is only called once (there should only be one DB UPDATE statement)
   • All resource attributes from the request have been updated appropriately and committed to the DB
   • The linkages in the m2m relationship should be changed appropriately and committed to the DB

2. Repeat step one but this time with a resource that has a "to-one" relationship. The relationship many be "one-to-many" or "one-to-one" as both of these relationship types are set the same way in Django (attribute assignment). Validate the following:

   • django.db.models.Model.save() is only called once (there should only be one DB UPDATE statement)
   • All resource attributes from the request have been updated appropriately and committed to the DB
   • The linked "to-one" resource should be assigned appropriately and committed to the DB

[brianrhyolite]

@ddobson Code review looks good.

[MSBoone5]

Code review looks good, will follow up with QA

[MSBoone5]

QA Looks good