我有一个使用ActiveAdmin gem的应用程序。
我们实际上有3个命名空间和100多个ActiveAdmin.register Model
rails 5.0.7
activeadmin 2.4。
该应用在生产环境下运行得非常好，但是在开发模式下，每次代码更改时，重新加载非常缓慢。
这可能与以下方面有关： 我深入研究了一下，似乎代码会为“浏览器请求”的HTML部分重新加载一次，但随后它会针对页面请求的每个资源多次重新加载。并且它同时进行。代码一次重新加载多次，重新加载开始变得非常缓慢。
这里是我刚进行代码修改时的输出日志：
Started GET "/admin/tickets" for ::1 at 2020-04-21 11:35:23 +0200
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
Processing by Admin::TicketsController#index as HTML
AdminUser Load (4.8ms) SELECT "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = $1 ORDER BY "admin_users"."id" ASC LIMIT $2 [["id", 1], ["LIMIT", 1]]
Rendering /Users/baptibenz/.rvm/gems/ruby-2.4.4/gems/activeadmin-2.4.0/app/views/active_admin/resource/index.html.arb
(2.3ms) SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM "tickets" LIMIT $1 OFFSET $2) subquery_for_count [["LIMIT", 30], ["OFFSET", 0]]
CACHE (0.0ms) SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM "tickets" LIMIT $1 OFFSET $2) subquery_for_count [["LIMIT", 30], ["OFFSET", 0]]
(2.1ms) SELECT COUNT(*) FROM "tickets"
CACHE (0.0ms) SELECT COUNT(count_column) FROM (SELECT 1 AS count_column FROM "tickets" LIMIT $1 OFFSET $2) subquery_for_count [["LIMIT", 30], ["OFFSET", 0]]
Ticket Load (2.6ms) SELECT "tickets".* FROM "tickets" ORDER BY "tickets"."id" desc LIMIT $1 OFFSET $2 [["LIMIT", 30], ["OFFSET", 0]]
Listing Load (2.9ms) SELECT "listings".* FROM "listings" WHERE "listings"."id" = $1 LIMIT $2 [["id", 22015], ["LIMIT", 1]]
Team Load (2.1ms) SELECT "teams".* FROM "teams" WHERE "teams"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
TicketCategory Load (9.6ms) SELECT "ticket_categories".* FROM "ticket_categories" WHERE "ticket_categories"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
Rendered admin/tickets/_index.arb (179.4ms)
TicketCategory Load (5.0ms) SELECT "ticket_categories".* FROM "ticket_categories"
Team Load (3.1ms) SELECT "teams".* FROM "teams"
AdminUser Load (28.2ms) SELECT "admin_users".* FROM "admin_users"
Rendered layouts/_analytics.erb (0.7ms)
Rendered /Users/baptibenz/.rvm/gems/ruby-2.4.4/gems/activeadmin-2.4.0/app/views/active_admin/resource/index.html.arb (470.9ms)
Completed 200 OK in 649ms (Views: 466.9ms | ActiveRecord: 68.7ms)
(3.1ms) BEGIN
(2.2ms) COMMIT
Started GET "/assets/jquery.xdan.datetimepicker.css" for ::1 at 2020-04-21 11:35:36 +0200
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
Started GET "/assets/active_admin.js" for ::1 at 2020-04-21 11:35:43 +0200
(2.1ms) BEGIN
(2.0ms) COMMIT
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
Started GET "/assets/active_admin/print.css" for ::1 at 2020-04-21 11:35:54 +0200
Started GET "/assets/active_admin.css" for ::1 at 2020-04-21 11:35:54 +0200
(3.4ms) BEGIN
(2.5ms) COMMIT
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
(2.4ms) BEGIN
(4.5ms) BEGIN
(5.2ms) COMMIT
(3.8ms) COMMIT
Started GET "/assets/active_admin/orderable.png" for ::1 at 2020-04-21 11:36:35 +0200
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
Started GET "/assets/active_admin/nested_menu_arrow.gif" for ::1 at 2020-04-21 11:36:56 +0200
(3.1ms) BEGIN
(3.1ms) COMMIT
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
Started GET "/assets/chosen-sprite@2x.png" for ::1 at 2020-04-21 11:37:19 +0200
(2.9ms) BEGIN
(2.5ms) COMMIT
Creating scope :customer_relations. Overwriting existing method AdminUser.customer_relations.
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: already initialized constant ActiveAdmin::CSVBuilder::DEFAULT_COLUMNS_OPTIONS
/Users/baptibenz/dev/backend/app/admin/lib/component.rb:3: warning: previous definition of DEFAULT_COLUMNS_OPTIONS was here
(2.2ms) BEGIN
(4.9ms) COMMIT
正如您所看到的，它在日期方面非常慢。
如果需要更多信息，请告诉我:-)
AdminUser.customer_relations，并告诉我在你的开发环境中该表的大小吗？ - matancoscope :customer_relations, -> { where(team: CUSTOMER_RELATIONS) }，表格大约有100行。我认为问题不在于这个作用域很慢，而是整个代码库被多次重新加载了，不是吗？ - baptibenz