aijinsong (艾劲松)

ruby 有哪些好用的日志框架

aijinsong — Sun, 19 Jul 2015 23:15:10 +0800

如题，类似于 java 里面的 log4j logback

不同的方式获取 AR 记录，AR 记录中的 Boolean 值产生差异

aijinsong — Thu, 07 May 2015 07:49:04 +0800

通过 all 获取的数据 ID 为 5 的 active 为 false 是对的。但是通过 current_account.room 获取的数据 ID 为 5 的 active 为 true 是错的。为何会因为获取的方式不一致，导致数据问题？

@rooms = current_account.rooms
@rooms.each { |room| puts "#{room.id}:#{room.active?}" }

打印的日志为：

DEBUG -  Room Load (0.4ms)  SELECT `rooms`.* FROM `rooms` WHERE `rooms`.`account_id` = 8
4:true
5:true

@rooms = Room.all
@rooms.each { |room| puts "#{room.id}:#{room.active?}" }

打印的日志为：

DEBUG -  Room Load (0.2ms)  SELECT `rooms`.* FROM `rooms` 
1:true
2:true
3:true
4:true
5:false

通过 Hash 的方式无法创建记录

aijinsong — Mon, 04 May 2015 21:59:17 +0800

@accountTemp = Hash.new
@accountTemp['name'] = 'aijinsong'
@accountTemp['email'] = 'test112@aijinsong.com'
@accountTemp['password'] = 'aiajsajs'
@accountTemp['password_confirmation'] = 'aiajsajs'
Account.create(@accountTemp)

上面这段代码执行后会有如下日志，导致无法创建新的账号：

DEBUG -  Account Exists (0.6ms)  SELECT 1 AS one FROM `accounts` WHERE LOWER(`accounts`.`email`) = LOWER('test112@aijinsong.com') LIMIT 1
DEBUG -   (0.1ms)  ROLLBACK

但是：

account = Account.create(:email => 'test112@aijinsong.com', :name => 'aijinsong', :password => 'aiajsajs', :password_confirmation => 'aiajsajs', :role => "admin")

这段代码执行后是成功的。日志如下：

DEBUG -   (0.1ms)  BEGIN
DEBUG -  Account Exists (0.3ms)  SELECT 1 AS one FROM `accounts` WHERE LOWER(`accounts`.`email`) = LOWER('test112@aijinsong.com') LIMIT 1
DEBUG -  SQL (0.2ms)  INSERT INTO `accounts` (`blogs_count`, `comments_count`, `created_at`, `crypted_password`, `email`, `logo`, `name`, `profile_image_url`, `profile_url`, `provider`, `role`, `uid`) VALUES (0, 0, '2015-05-04 21:52:14', '$2a$10$7FoH64NjksN39nKI7gm7zu/36dlbgxWYpdn5590JWxjhlJersyN6W', 'test112@aijinsong.com', NULL, 'aijinsong', NULL, NULL, NULL, 'admin', NULL)
DEBUG -   (0.5ms)  COMMIT

请教：为什么通过多态的方式使用 includes 报错？正确的写法是什么？

aijinsong — Wed, 25 Dec 2013 12:02:45 +0800

class Party < ActiveRecord::Base
  has_many :parties_telecom_numbers
end

class Customer < ActiveRecord::Base
  has_many :parties_telecom_numbers, :as => Party
  has_many :telecom_numbers, :through => :parties_telecom_numbers
end

class PartiesTelecomNumber < ActiveRecord::Base
  belongs_to :party
  belongs_to :telecom_number
end

class TelecomNumber < ActiveRecord::Base
end

class McCustomerQuery < ActiveRecord::Base

  def self.findByTelecomNumber(telecomNumber)

    #test1 result success
    parties = Party.includes(:parties_telecom_numbers).limit(10)
    parties.each { |partiy| puts partiy.parties_telecom_numbers.size }

    #test2 result success
    customers = Customer.all
    customers.each { |customer| puts customer.parties_telecom_numbers.size }

    #test3 result success
    customers = Customer.all
    customers.each { |customer| puts customer.telecom_numbers.size }

    #test4 result fail 
    # NoMethodError (undefined method `each' for nil:NilClass):
    #   app/models/mc_customer_query.rb:20:in `findByTelecomNumber'
    #   app/controllers/parties_controller.rb:9:in `index'
    customers = Customer.includes(:parties_telecom_numbers).limit(10)
    customers.each { |customer| puts customer.parties_telecom_numbers.size }

  end

end

请教：为什么通过多态的方式使用 includes 报错？正确的写法是什么？