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ActiveRecord::根据文档,所有内容都存在许多ThroughAssociationNotFoundError问题

associations activerecord ruby ruby-on-rails

Khoj Badami · 技术社区 · 6 年前

以下是我的型号:

class Client < ApplicationRecord

  has_many :client_authorization_rules
  has_many :projects, through: :client_authorization_rule

end

class Project < ApplicationRecord

  has_many :client_authorization_rules
  has_many :clients, through: :client_authorization_rule

end

class ClientAuthorizationRule < ApplicationRecord

  belongs_to :project
  belongs_to :client

  validates_presence_of :project
  validates_presence_of :client

end

因此,我按照文件的要求遵守了所有规定: http://guides.rubyonrails.org/association_basics.html#the-has-many-through-association

我犯的错误是当我做以下事情时:

p.clients

这里的“p”是一个项目。我甚至无法访问项目上的“clients”方法,否则会出现以下错误:

ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association :client_authorization_rule in model Project

不知道我错过了什么。谢谢我的Rails版本是Rails 5.0.6和ruby 2.2.3。这是已知的问题吗?我找不到有这个问题的人。

2 回复 | 直到 6 年前

Anand 6 年前

通过::client\u authorization\u rule

应该是client\u authorization\u rules

class Client < ApplicationRecord

  has_many :client_authorization_rules
  has_many :projects, through: :client_authorization_rules

end

class Project < ApplicationRecord

  has_many :client_authorization_rules
  has_many :clients, through: :client_authorization_rules

end

还有一件事作为你写作时的旁注 belongs_to :project 在rails 5中,它自动表示 project_id 保存前需要。所以没有意识到 validates_presence_of :project

class ClientAuthorizationRule < ApplicationRecord

  belongs_to :project #it means that project_id required is true
  belongs_to :client  #it means that client_id required is true

  #validates_presence_of :project
  #validates_presence_of :client

end

Salil 6 年前

下列的

class Client < ApplicationRecord

  has_many :client_authorization_rules
  has_many :projects, through: :client_authorization_rule

end

class Project < ApplicationRecord

  has_many :client_authorization_rules
  has_many :clients, through: :client_authorization_rule

end

应该是

class Client < ApplicationRecord    
  has_many :client_authorization_rules
  has_many :projects, through: :client_authorization_rules    
end

class Project < ApplicationRecord    
  has_many :client_authorization_rules
  has_many :clients, through: :client_authorization_rules    
end

注:- through: :client_authorization_rule 应该是 through: :client_authorization_rules