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Last tested: June 2020
If the Role has the manage_models permission, then their models cannot be limited. This behavior is explained in the permissions docs:
"Each LookML model is mapped to a specific set of database connections on the Manage LookML Projects page. This permission lets the user configure these mappings. Therefore, users with this permission have access to every database connection. If you want developers to be limited to certain connections do not grant this permission and leave the model connection mapping to Admins."
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