[views] Only allow JSON requests on get_entities

Also redefine __select__ as parent classes require a version in the URL.
4 jobs for !29 with topic/default/select-get-entities in 2 minutes and 15 seconds (queued for 8 seconds)
latest detached
Status Job ID Name Coverage
  Lint
passed black #419805

00:00:32

passed check-manifest #419806

00:00:26

passed flake8 #419804

00:00:33

 
  Tests
passed py3 #419807

00:01:41