Question

我知道有很多关于此类错误的主题，你可以肯定我已经阅读了所有这些但仍然无法弄清楚为什么这不起作用。我仍然得到这个错误：

HasManyThroughAssociationNotFoundError：找不到关联

以下是我的模特：

#collection.rb
class Collection < ActiveRecord::Base
 belongs_to :user
 has_many :collection_releases
 has_many :releases, :through => :collection_releases
end

#release.rb
class Release < ActiveRecord::Base
 belongs_to :artist
 belongs_to :label

 has_many :collection_releases
 has_many :collections, :through => :collection_releases

 has_many :track_releases
 has_many :tracks, :through => :track_releases  

 validates :title, presence: true
end

#collection_release
class CollectionRelease < ActiveRecord::Base
 belongs_to :collection
 belongs_to :release
end

我在做collection.releases时没有收到错误 - 当我试图获取与发布相关联的所有集合时，我只会收到错误（release.collections）

ruby控制台中的完全错误：

    2.2.1 :077 >   co.releases
 => #<ActiveRecord::Associations::CollectionProxy [#<Release id: 1, created_at: "2015-09-25 14:38:59", updated_at: "2015-09-25 14:38:59", artist_id: 1, label_id: 1, title: "First Release of BF on Larj", year: nil, country: "Germany">]> 
2.2.1 :078 > trelease.collections
ActiveRecord::HasManyThroughAssociationNotFoundError: Could not find the association :collection_releases in model Release
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activerecord-4.2.4/lib/active_record/reflection.rb:828:in `check_validity!'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activerecord-4.2.4/lib/active_record/associations/association.rb:25:in `initialize'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activerecord-4.2.4/lib/active_record/associations/has_many_through_association.rb:10:in `initialize'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activerecord-4.2.4/lib/active_record/associations.rb:162:in `new'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activerecord-4.2.4/lib/active_record/associations.rb:162:in `association'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activerecord-4.2.4/lib/active_record/associations/builder/association.rb:115:in `collections'
    from (irb):78
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/railties-4.2.4/lib/rails/commands/console.rb:110:in `start'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/railties-4.2.4/lib/rails/commands/console.rb:9:in `start'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/railties-4.2.4/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/railties-4.2.4/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `block in require'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:274:in `require'
    from /Users/eqal/Documents/ror/matchit/bin/rails:8:in `<top (required)>'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:268:in `load'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:268:in `block in load'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/eqal/.rvm/gems/ruby-2.2.1@matchit/gems/activesupport-4.2.4/lib/active_support/dependencies.rb:268:in `load'
    from /Users/eqal/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/eqal/.rvm/rubies/ruby-2.2.1/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from -e:1:in `<main>'2.2.1 :079 >

我感到非常绝望，所以我希望有人知道这里出了什么问题。

非常感谢！

Answer 1

Rails约定期望您的直通表命名为：collections_releases。而你的模型CollectionsRelease。当然，如果你想保留单数collection_releases名称，你可以覆盖。

Rails 4：有很多通过关联错误

1 个答案: