Ruby on rails 连接表Rails的访问列_Ruby On Rails_Activerecord

Ruby on rails 连接表Rails的访问列

ruby-on-rails activerecord

Ruby on rails 连接表Rails的访问列,ruby-on-rails,activerecord,Ruby On Rails,Activerecord,我有以下型号 class Player < ActiveRecord::Base has_many :players_to_teams has_many :teams, through: :players_to_teams end class Team < ActiveRecord::Base has_many :players_to_teams has_many :players, through: :players_to_teams belongs_to :

我有以下型号

class Player < ActiveRecord::Base
  has_many :players_to_teams
  has_many :teams, through: :players_to_teams
end

class Team < ActiveRecord::Base
  has_many :players_to_teams
  has_many :players, through: :players_to_teams
  belongs_to :account
end

出现此错误时：

NoMethodError:   undefined method `BT' for #<ActiveRecord::Relation:0x007fd52f170c58>
PlayersToTeam Load (332.2ms)    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/relation/delegation.rb:45:in `method_missing'
  SELECT `players_to_teams`.* FROM `players_to_teams` WHERE `players_to_teams`.`player_id` = 13
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/associations/collection_proxy.rb:101:in `method_missing'
    from (irb):4
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start'
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start'
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>'
    from /Users/Tyler/Development/Rails/csbb/script/rails:6:in `require'
    from /Users/Tyler/Development/Rails/csbb/script/rails:6:in `<top (required)>'
    from -e:1:in `load'
    from -e:1:in `<main>'

有没有一种方法可以访问Rails 3.2.1中连接表中存储的值而不使用

select

选项

谢谢

因为玩家对团队是一个连接表，你没有在上面运行所有的操作，所以你得到了一个关系

首先，您需要为集合调用all或为单个PlayerToteam对象调用first

另外，我很确定它会因为大写字母（Ruby中的常量有大写字母）而阻塞名为BT的方法。

一旦我调用了“first”，一切都很好。它没有因为资本化而窒息（加分）。这是一个我正在转换的遗留数据库，所以我一定会继续。谢谢

player = Player.find(13)
player.players_to_teams.BT

NoMethodError:   undefined method `BT' for #<ActiveRecord::Relation:0x007fd52f170c58>
PlayersToTeam Load (332.2ms)    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/relation/delegation.rb:45:in `method_missing'
  SELECT `players_to_teams`.* FROM `players_to_teams` WHERE `players_to_teams`.`player_id` = 13
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.2.1/lib/active_record/associations/collection_proxy.rb:101:in `method_missing'
    from (irb):4
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/commands/console.rb:47:in `start'
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/commands/console.rb:8:in `start'
    from /Users/Tyler/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.2.1/lib/rails/commands.rb:41:in `<top (required)>'
    from /Users/Tyler/Development/Rails/csbb/script/rails:6:in `require'
    from /Users/Tyler/Development/Rails/csbb/script/rails:6:in `<top (required)>'
    from -e:1:in `load'
    from -e:1:in `<main>'

player.players_to_teams.select("BT")