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When using :pluck, ActiveRecord trigger the query immediately.
The above is a behavior we probably want to avoid, because
implies a query to the database regarless of the role or
permission.
** Before
osem_1 | 07:39:11 web.1 | Started GET "/" for 172.20.0.1 at 2019-07-1207:39:11 +0000
osem_1 | 07:39:11 web.1 | (0.3ms) SELECT
"conferences"."custom_domain" FROM "conferences" WHERE
("conferences"."custom_domain" IS NOT NULL) ORDER BY start_date DESC
osem_1 | 07:39:11 web.1 | Processing by ConferencesController#index as HTML
osem_1 | 07:39:11 web.1 | (1.3ms) SELECT "events"."id" FROM
"events" WHERE "events"."state" = $ 1 [["state", "confirmed"]]
osem_1 | 07:39:11 web.1 | ↳ app/models/ability.rb:39:in `not_signed_in'
osem_1 | 07:39:11 web.1 | Rendering layouts/application.html.haml
osem_1 | 07:39:11 web.1 | Rendering conferences/index.html.haml within layouts/application
** After
osem_1 | 07:43:18 web.1 | Started GET "/" for 172.20.0.1 at 2019-07-1207:43:18 +0000
osem_1 | 07:43:19 web.1 | (0.2ms) SELECT
"conferences"."custom_domain" FROM "conferences" WHERE
("conferences"."custom_domain" IS NOT NULL) ORDER BY start_date DESC
osem_1 | 07:43:19 web.1 | Processing by ConferencesController#index as HTML
osem_1 | 07:43:19 web.1 | Rendering layouts/application.html.haml
osem_1 | 07:43:19 web.1 | Rendering conferences/index.html.haml within layouts/application
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| .. | ||
| assets | ||
| controllers | ||
| datatables | ||
| helpers | ||
| jobs | ||
| mailers | ||
| models | ||
| pdfs | ||
| serializers | ||
| uploaders | ||
| views | ||