检查页面上当前有多少用户的最佳方法是什么?
最佳答案
保存在Redis中
喜欢 Yuri Barbashow 的 answer但使用 Redis ( nice introdution for Rails ):
# config/initializers/redis.rb
$redis_onlines = Redis.new
# it's the simplest way, but i'd recommend:
# $redis_onlines = Redis.new path: "/tmp/redis.sock", db: 15, driver: :hiredis
# => hiredis driver more fast
# => use unix domain socket if it's possible
# => default db is No.0, but it is better to use a specific database
# and No.0 leave for testing-development-and-more-and-more
gem 文件
# Gemfile
gem 'redis'
gem 'hiredis' # optional
# don't forget to run `bundle`
设置为在线
# app/controllers/application_controller.rb
after_filter :set_online
# the Rails 4 way is:
# after_action :set_online
private
# set to online
def set_online
if !!current_user
# using separate Redis database
# such as $redis_onlines = Redis.new db: 15
# value not need, only key
$redis_onlines.set( current_user.id, nil, ex: 10*60 )
# 'ex: 10*60' - set time to live - 10 minutes
end
end
在线吗?
# app/models/user.rb
def online?
$redis_onlines.exists( self.id )
end
还有小红利(如果你使用单独的 redis 数据库)
# app/cpntrollers/application_controller.rb
def all_who_are_in_touch
$redis_onlines.keys
# => [ "123", "234", "1", "23" ]
# array of ids
end
#UDP1 匿名返工
设置为在线
# app/controllers/application_controller.rb
def set_online
if !!current_user
$redis_onlines.set( "user:#{current_user.id}", nil, ex: 10*60 )
else
$redis_onlines.set( "ip:#{request.remote_ip}", nil, ex: 10*60 )
end
end
在线吗?
# app/models/user.rb
def online?
$redis_onlines.exists( "user:#{self.id}" )
end
所有联系的人:
# app/cpntrollers/application_controller.rb
def all_signed_in_in_touch
ids = []
$redis_onlines.scan_each( match: 'user*' ){|u| ids << u.gsub("user:", "") }
ids
end
def all_anonymous_in_touch
$redis_onlines.scan_each( match: 'ip*' ).to_a.size
end
def all_who_are_in_touch
$redis_onlines.dbsize
end
#UDP2 建议
- 使用
before_filter
而不是after_filter
# app/controllers/application_controller.rb
before_filter :set_online # before_action for Rails 4
- 如果你看的是匿名的(比如
session[:user_id]
是当前用户的id)
# app/controllers/session_controller.rb
before_filter :clear_from_signed_in_touch, only: :destroy
before_filter :clear_from_anonymous_in_touch, only: :create
private
def clear_from_anonymous_in_touch
$redis_onlines.del( "ip:#{request.remote_ip}" )
end
def clear_from_signed_in_touch
$redis_onlines.del( "user:#{session[:user_id]}" )
end
后记:Redis | set | exists | expire | scan | scan_each | redis-rb | hiredis | nice introduction for beginners
关于ruby-on-rails - Rails - 如何检查在线用户?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10805479/