flowerwrong (花错) · Replies

# redis.rb
# redis conig
REDIS_CONFIG = YAML.load(File.open(Rails.root.join('config/redis.yml'))).symbolize_keys
default_config = REDIS_CONFIG[:default].symbolize_keys
redis_config = default_config.merge(REDIS_CONFIG[Rails.env.to_sym].symbolize_keys) if REDIS_CONFIG[Rails.env.to_sym]

$redis = Redis.new(redis_config)
# @see https://github.com/resque/redis-namespace
$namespaced_redis = Redis::Namespace.new(redis_config[:namespace], redis: $redis) if redis_config[:namespace]

# redis -> object
# @see https://github.com/nateware/redis-objects
# require 'connection_pool'
# Redis::Objects.redis = ConnectionPool.new(size: 5, timeout: 5) { $redis }

# To clear out the db before each test and development
begin
  $redis.flushdb if Rails.env == 'test'
  $redis.flushdb if Rails.env == 'development'
rescue Exception => e
  p '-' * 20
  p "Error trying with $redis.flushdb: #{e.message}"
  p 'You may need to start the redis-server with `sudo service redis-server start`'
  p 'If the redis-server is not installed, please `sudo apt-get install redis-server`.'
  p 'You are not using linux? See you.'
  p '-' * 20
  rails_pid = Process.pid # thanks @rubyist518
  cmd = "kill -SIGINT #{rails_pid}"
  `#{cmd}`
end

# config/redis.yml
default:
  host: localhost
  port: 6379
  driver: hiredis

development:
  db: 0
  namespace: app_development

test:
  db: 1
  namespace: app_test

production:
  db: 2
  host: 127.0.0.1
  namespace: app_production

用 where 查找出来的类型为 ActiveRecord::Relation，但需要 model 实例，求帮助 at December 08, 2015

简单条件find_by（finds the first record matching some conditions），无order时等价于where().first，比较简单；复杂的where().take(retrieves a record without any implicit ordering) or where().first(finds the first record ordered by the primary key) or where().last(finds the last record ordered by the primary key). 具体参考 rails guides

Elixir 有人用吗? at December 05, 2015

更喜erlang

该如何获取这种 params at November 27, 2015

params[:excel].tempfile 这个才是拿文件

本人自行删除 at November 26, 2015

那得看你的协议，通常加长度是为了协议数据的完整性。TCP 不能保证。

数据怎么查询才能优化查询速度 at November 18, 2015

joins or includes 不谢

Rails 小项目的一些分享 at November 17, 2015

arr.sort { |a, b| a.better_v <=> b.better_v }.reverse
arr.sort { |a, b| b.better_v <=> a.better_v }

如何设计登录错三次之后才输入验证码？ at November 16, 2015

大爱 redis ttl

准备着手翻译出版《Rebuilding Rails》，有人愿意买吗？ at November 16, 2015

书单里面，买买买