Introduce ApplicationController#cache_collection_paginated_by_id (#14677)

* Replace incorrect use of distinct with group

Some uses of ActiveRecord::QueryMethods#distinct pass field names but they
are incorrect for the current version of Rails.

ActiveRecord::QueryMethods#group provides the expected behavior and
benefits performance. See commit 6da24aad4cafdef8d8a2c92bac2002a5fc2fe9c8.

* Introduce ApplicationController#cache_collection_paginated_by_id

ApplicationController#cache_collection_paginated_by_id fuses
ApplicationController#cache_collection and Paginable.paginate_by_id.

An advantage of this method is that it prevents from modifying scope which
Paginable.paginate_by_id may provide.
ApplicationController#cache_collection always return an array and there
is no possibility of the scope modification. It is also clear for a
programmer, considering the implication of "cache".

This method can also emit more efficient queries by using
Cacheable.cache_ids before calling Paginable.paginate_by_id.

1 files changed, 6 insertions, 5 deletions

diff --git a/app/controllers/api/v1/accounts/statuses_controller.rb b/app/controllers/api/v1/accounts/statuses_controller.rb
index 1af768e54..85a9133e3 100644
--- a/app/controllers/api/v1/accounts/statuses_controller.rb
+++ b/app/controllers/api/v1/accounts/statuses_controller.rb
@@ -22,10 +22,6 @@ class Api::V1::Accounts::StatusesController < Api::BaseController
   end
 
   def cached_account_statuses
-    cache_collection account_statuses, Status
-  end
-
-  def account_statuses
     statuses = truthy_param?(:pinned) ? pinned_scope : permitted_account_statuses
 
     statuses.merge!(only_media_scope) if truthy_param?(:only_media)
@@ -33,7 +29,12 @@ class Api::V1::Accounts::StatusesController < Api::BaseController
     statuses.merge!(no_reblogs_scope) if truthy_param?(:exclude_reblogs)
     statuses.merge!(hashtag_scope)    if params[:tagged].present?
 
-    statuses.paginate_by_id(limit_param(DEFAULT_STATUSES_LIMIT), params_slice(:max_id, :since_id, :min_id))
+    cache_collection_paginated_by_id(
+      statuses,
+      Status,
+      limit_param(DEFAULT_STATUSES_LIMIT),
+      params_slice(:max_id, :since_id, :min_id)
+    )
   end
 
   def permitted_account_statuses