On our dev instance, /admin/applications as not loading because:
1. There was an unindexed query by `application_id`.
2. There was an expensive query that attempted to load 1 million
unique entries via ActiveRecord just to find the unique count.
We fix the first issue by adding an index for that column.
We fix the second issue with a simple SELECT COUNT(DISTINCT
resource_owner_id) SQL query.
In addition, we add pagination to avoid loading more than 20
applications at once.
Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/67228
Updates specs to use new rails5 format.
The old format:
`get :show, { some: params }, { some: headers }`
The new format:
`get :show, params: { some: params }, headers: { some: headers }`
GitLab Bot
Stan Hu
gfyoung
blackst0ne
Oswaldo Ferreira
Markus Koller