has_many通过在Rails中返回多个关联的对象4

我通过Rails中的关联有has_many问题。有型号：has_many通过在Rails中返回多个关联的对象4

class Interval < ActiveRecord::Base 
belongs_to :training 

has_many :termins 
has_many :users, through: :termins 
end 

class User < ActiveRecord::Base 

belongs_to :role 
has_many :termins 
has_many :intervals, through: :termins 
end 

class Termin < ActiveRecord::Base 
belongs_to :interval 
belongs_to :user 
end

所以，我已经创建了一个间隔为一个用户，并创建了几个termins：

Interval.first #=> <Interval id: 6, from: "2014-10-17", to: "2014-11-17", training_id: 1, created_at: "2014-10-16 22:39:38", updated_at: "2014-10-16 22:39:38"> 

Interval.first.termins 
[ 
    #<Termin id: 9, interval_id: 6, user_id: 4, term: "2014-10-16", created_at: "2014-10-16 22:42:15", updated_at: "2014-10-16 22:42:15">, 
    #<Termin id: 10, interval_id: 6, user_id: 4, term: "2014-10-23", created_at: "2014-10-16 22:43:02", updated_at: "2014-10-16 22:43:02">, 
    #<Termin id: 11, interval_id: 6, user_id: 4, term: "2014-10-31", created_at: "2014-10-16 22:44:40", updated_at: "2014-10-16 22:44:40"> 
]

但是，当我把： Interval.first.users

[ 
#<User id: 4, email: "[email protected]", encrypted_password: "$2a$10$ChVTiXt2EjKzKYiq4GEvT.d21MuOHydJxCGxDextAYt0...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2014-10-15 22:27:44", updated_at: "2014-10-16 21:21:25", first_name: "Member", last_name: "Member", phone_number: "00000000", date_of_birth: "1989-10-16", sex: "0", role_id: 3>, 
#<User id: 4, email: "[email protected]", encrypted_password: "$2a$10$ChVTiXt2EjKzKYiq4GEvT.d21MuOHydJxCGxDextAYt0...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2014-10-15 22:27:44", updated_at: "2014-10-16 21:21:25", first_name: "Member", last_name: "Member", phone_number: "00000000", date_of_birth: "1989-10-16", sex: "0", role_id: 3>, 
#<User id: 4, email: "[email protected]", encrypted_password: "$2a$10$ChVTiXt2EjKzKYiq4GEvT.d21MuOHydJxCGxDextAYt0...", reset_password_token: nil, reset_password_sent_at: nil, remember_created_at: nil, sign_in_count: 0, current_sign_in_at: nil, last_sign_in_at: nil, current_sign_in_ip: nil, last_sign_in_ip: nil, created_at: "2014-10-15 22:27:44", updated_at: "2014-10-16 21:21:25", first_name: "Member", last_name: "Member", phone_number: "00000000", date_of_birth: "1989-10-16", sex: "0", role_id: 3> 
]

我想只得到最后一个查询的1条记录，因为有三次相同的用户。 欢迎任何帮助。感谢

来源

2014-10-16 zauzaj

让它：

has_many :users, -> { uniq }, through: :termins

轨道4之前，你会使用has_many :users, through: :termins, uniq: true，但它现在已经过时及以上使用破折号，火箭是很长的路要走。

来源

2014-10-17 10:36:16 katafrakt

has_many通过在Rails中返回多个关联的对象4

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