Rails 4: 有很多through association错误

Question

我知道有很多关于此类错误的主题，您可以确定我已经阅读了所有内容，但仍然无法弄清楚为什么这不起作用。我仍然收到此错误：

HasManyThroughAssociationNotFoundError: Could not find the association

这是我的模型：

#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

我在执行 collection.releases 时没有收到错误消息 - 我仅在尝试获取与版本关联的所有集合时收到错误消息 (release.collections)

ruby 控制台完全错误：

    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 惯例要求您通过 table 命名为：collections_releases。还有你的模特 CollectionsRelease。当然，如果您想保留单数 collection_releases 名称，您可以覆盖。

Rails 4: 有很多through association错误

Rails 4: has many through association error

ruby-on-rails

has-many-through