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Adding back ?_format=jsonld

Drupal requires the use of a _format query parameter to get alternate representations of a node/media.

By default, Islandora deploys with the jsonld module and the Milliner microservice. These two components are configured to strip this _format query parameter off of the end of URIs.

This means that when your content is indexed in Fedora, the triplestore, etc... it's URI will be something like http://localhost:8000/node/1 and not http://localhost:8000/node/1?_format=jsonld.

Pre-1.0 installations.

If you are using a very early version of Islandora "8" (pre-release), then you may have URIs with _format=jsonld at the end of them.

If you update to newer code, you will need to ensure that your site is configured to add ?_format=jsonld back to the URLs if you want to maintain consistency.

If you don't do this, you can end up with two copies of your objects in your Fedora repository (one with and one without ?_format=jsonld). You will also have two sets of triples in your triplestore.

Adding ?_format=jsonld to your URIs

To turn the ?_format parameter back on:

  • Go to admin/config/search/jsonld and confirm the "Remove jsonld parameter from @ids" checkbox is unchecked.
  • Add strip_format_jsonld: false to your Milliner config. If you deployed using the default Islandora-playbook this file would be located at /var/www/html/Crayfish/Milliner/cfg/config.yaml.

If you are using Islandora-playbook and are provisioning new environments for your older Islandora, you'll want to lock down the variables in your inventory that control this config.

  • crayfish_milliner_strip_format_jsonld: true
  • webserver_app_jsonld_remove_format: 1

Last update: June 19, 2024