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author | Guo Xiang Tan <tgx_world@hotmail.com> | 2017-09-11 14:01:59 +0800 |
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committer | Guo Xiang Tan <tgx_world@hotmail.com> | 2017-09-11 14:01:59 +0800 |
commit | 32e1e70995a0c3f985dd2b5e9ce2295bc7b906ef (patch) | |
tree | 911d74c37962a413550693fdd1d6668ff0745817 /actionview | |
parent | ee79f0085b56e47ea69bd9f93cdb0a90da69568e (diff) | |
download | rails-32e1e70995a0c3f985dd2b5e9ce2295bc7b906ef.tar.gz rails-32e1e70995a0c3f985dd2b5e9ce2295bc7b906ef.tar.bz2 rails-32e1e70995a0c3f985dd2b5e9ce2295bc7b906ef.zip |
PERF: Incorrect memoization in `ActiveRecord::Associations::Preloader::Association`.
```
require 'active_record'
require 'benchmark/ips'
ActiveRecord::Base.establish_connection(ENV.fetch('DATABASE_URL'))
ActiveRecord::Migration.verbose = false
ActiveRecord::Schema.define do
create_table :users, force: true do |t|
t.string :name, :email
t.integer :topic_id
t.timestamps null: false
end
create_table :topics, force: true do |t|
t.string :title
t.timestamps null: false
end
end
attributes = {
name: 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.',
email: 'foobar@email.com'
}
class Topic < ActiveRecord::Base
has_many :users
end
class User < ActiveRecord::Base
belongs_to :topic
end
100.times do
User.create!(attributes)
end
users = User.first(50)
100.times do
Topic.create!(title: 'This is a topic', users: users)
end
Benchmark.ips do |x|
x.config(time: 10, warmup: 5)
x.report("preload") do
User.includes(:topic).all.to_a
end
end
```
```
Calculating -------------------------------------
preload 25.000 i/100ms
-------------------------------------------------
preload 251.772 (± 1.2%) i/s - 2.525k
```
```
Calculating -------------------------------------
preload 26.000 i/100ms
-------------------------------------------------
preload 270.392 (± 1.1%) i/s - 2.704k
```
Diffstat (limited to 'actionview')
0 files changed, 0 insertions, 0 deletions