cache_version.rb

# frozen_string_literal: true

require"active_record"

ActiveRecord::Base.establish_connection(adapter: "sqlite3",database: ":memory:")
ActiveRecord::Base.cache_versioning=true

ActiveRecord::Schema.definedo
create_table:users,force: truedo |t|
t.string:name
t.timestampsnull: false
end

create_table:topics,force: truedo |t|
t.string:title
t.integer:user_id
t.timestampsnull: false
end
end

classTopic < ActiveRecord::Base
belongs_to:user
end

classUser < ActiveRecord::Base
has_many:topics
end

mass_user_create=1000.times.each.mapdo
{name: "user"}
end

User.create(mass_user_create)

ALL_USERS=User.all

putsALL_USERS.first.method(:cache_version).source_location

Benchmark.bm{ |x|
x.report("title_was"){
ALL_USERS.eachdo |user|
user.cache_version
end
}
}