更新到Rails 7后出现NameError

Question

我的应用程序从 2017 年一直到现在（Rails 5.1 到 7.1.3.4）。

以前我可以随机更新控制台中的对象，例如：

object.update(variable: true)

但是我在尝试这一类时遇到了这个错误：

 irb(main):008> asdf.update(expired:true)
(irb):8:in `<main>': Missing model class BananaShacks for the ExpirationDate#banana_shacks association. You can specify a different model class with the :class_name option. (NameError)

              old_raise.call(*args)
                       ^^^^^
/home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/inheritance.rb:264:in `compute_type': uninitialized constant ExpirationDate::BananaShacks (NameError)

              old_raise.call(*args)
                       ^^^^^
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/reflection.rb:468:in `compute_class'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/reflection.rb:412:in `klass'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/reflection.rb:571:in `check_validity!'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/associations/association.rb:42:in `initialize'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/associations.rb:320:in `new'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/associations.rb:320:in `association'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activerecord-7.1.3.4/lib/active_record/associations/builder/association.rb:104:in `banana_shacks'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activemodel-7.1.3.4/lib/active_model/validator.rb:152:in `block in validate'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activemodel-7.1.3.4/lib/active_model/validator.rb:151:in `each'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activemodel-7.1.3.4/lib/active_model/validator.rb:151:in `validate'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activesupport-7.1.3.4/lib/active_support/callbacks.rb:426:in `block in make_lambda'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activesupport-7.1.3.4/lib/active_support/callbacks.rb:202:in `block (2 levels) in halting'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activesupport-7.1.3.4/lib/active_support/callbacks.rb:707:in `block (2 levels) in default_terminator'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activesupport-7.1.3.4/lib/active_support/callbacks.rb:706:in `catch'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activesupport-7.1.3.4/lib/active_support/callbacks.rb:706:in `block in default_terminator'
    from /home/dave/.rbenv/versions/3.1.4/lib/ruby/gems/3.1.0/gems/activesupport-7.1.3.4/lib/active_support/callbacks.rb:203:in `block in halting'
    ... 62 levels...

香蕉小屋：

has_many :expiration_dates

有效期

belongs_to :banana_shacks

我唯一注意到的是，错误中显示了 BananaShacks，而它应该是 BananaShack，或者至少是类名（banana_shacks / BananaShack）。

在谷歌上没有看到任何答案，除非重做数据库

Answer 1

belongs_to

关联必须使用单数术语。如果您在上例中对

banana_shack

模型中的

ExpirationDate

关联使用复数形式，并尝试通过

ExpirationDate.create(banana_shacks: @banana_shack)

创建实例，则会被告知有一个

"uninitialized constant ExpirationDate::BananaShacks"

。这是因为 Rails 会自动从关联名称中推断出类名称。如果关联名称的复数形式错误，那么推断出的类也将被错误地复数形式。

经过一些研究，似乎这种多元化在v6.1.0之后变得非常严格，这可能是它在升级之前工作的原因。