如何構建has_many：通過Rails中相同模型（用戶）之間的關係？

我想在同一個模型（用戶）之間建立多對多的關係。如何構建has_many：通過Rails中相同模型（用戶）之間的關係？

我有用戶模式：

class User < ActiveRecord::Base  
    has_many :broker_clients 
    has_many :clients, :through => :broker_clients  
end

而且BrokerClient：

class BrokerClients < ActiveRecord::Base 
    belongs_to :broker, class_name: "User" 
    belongs_to :client, class_name: "User" 
end

當我使用的軌道控制檯，這樣做：

>> User.first.clients 
    User Load (0.7ms) SELECT "users".* FROM "users" ORDER BY "users"."id" ASC LIMIT 1 
NameError: uninitialized constant User::BrokerClient 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/inheritance.rb:125:in `compute_type' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/reflection.rb:178:in `klass' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/reflection.rb:420:in `block in source_reflection' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/reflection.rb:420:in `collect' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/reflection.rb:420:in `source_reflection' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/reflection.rb:557:in `check_validity!' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/associations/association.rb:26:in `initialize' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/associations/has_many_through_association.rb:9:in `initialize' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/associations.rb:157:in `new' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/associations.rb:157:in `association' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/activerecord-4.0.1/lib/active_record/associations/builder/association.rb:70:in `clients' 
    from (irb):4 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/railties-4.0.1/lib/rails/commands/console.rb:90:in `start' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/railties-4.0.1/lib/rails/commands/console.rb:9:in `start' 
    from /Users/info/.rvm/gems/ruby-2.0.0-p451/gems/railties-4.0.1/lib/rails/commands.rb:62:in `<top (required)>' 
    from bin/rails:4:in `require' 
    from bin/rails:4:in `<main>'>>

我做錯了什麼在這裏得到這個錯誤：

NameError: uninitialized constant User::BrokerClient

來源

2014-10-10 Eki Eqbal

在你的經紀人的客戶採取一看，它並沒有太大的意義。它通常是'belongs_to：broker，class_name：'User''和'belongs_to：client，class_name：'User''。然後'用戶'將'has_many：客戶端，通過：：broker_clients'。 – ptd 2014-10-10 16:34:10

那麼，Client和Broker是User的子類。我修改了BrokerClient：class BrokerClients 2014-10-10 16:45:17

你的班級應該是單數。如果你的表是'broker_clients'，那麼'class BrokerClient'。 ActiveRecord根據你的表名尋找合適的類，它不存在。 – ptd 2014-10-10 16:51:30

試試這個：

class User < ActiveRecord::Base  
    has_many :broker_clients, :class_name => "User", :foreign_key => "broker_id" 
    has_many :clients, :class_name => "User", :foreign_key => "client_id" 

    #Your class definition here... 
end

Access客戶端和broker_clients通過：

clients = User.first.clients 
    broker_clients = User.first.broker_clients

來源

2014-10-10 16:53:24

has_many客戶端無：through =>：broker_clients ??我如何與broker_clients表關聯？ – 2014-10-10 16:55:52

我不想訪問broker_clients，我只想通過broker_clients表訪問客戶端。 – 2014-10-10 16:58:09

我的想法是保持客戶端和broker_client在同一個表中，沒有第二個表。它有點規範你的表，但也可能是一個解決方案。 – 2014-10-10 17:01:37

如何構建has_many：通過Rails中相同模型（用戶）之間的關係？

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