Rails 5 上 Ruby 中的 build() 发生了什么

Question

我在 Rails 4 / 5 中使用嵌套表单。在 Rails4 中使用 @my_model_instance.build 的代码似乎在 Rails 5 中不起作用.不知道是bug还是我的问题

详情：

Rails 4.2.3 控制台：

> @item = ItemType.new
=> #<ItemType id: nil, name: nil, .... >
> @item.item_abilities
=> #<ActiveRecord::Associations::CollectionProxy []>
> @item.item_abilities.build
=> #<ItemAbility id: nil, item_type_id: nil, ... >
> @item.item_abilities
=> #<ActiveRecord::Associations::CollectionProxy [#<ItemAbility id: nil, item_type_id: nil, ... ]>

这相当于 documented/expected。现在让我们在 Rails 5 (rc2).

中的相同代码库上尝试相同的东西

Rails 5.0.0rc2 控制台：

> @item = ItemType.new
=> #<ItemType id: nil, name: nil, .... >
> @item.item_abilities
=> #<ActiveRecord::Associations::CollectionProxy []>
> @item.item_abilities.build
ArgumentError: wrong number of arguments (given 2, expected 0..1)
from /var/lib/gems/2.3.0/gems/activerecord-5.0.0.rc2/lib/active_record/core.rb:312:in `initialize'
from /var/lib/gems/2.3.0/gems/activerecord-5.0.0.rc2/lib/active_record/inheritance.rb:65:in `new'
from /var/lib/gems/2.3.0/gems/activerecord-5.0.0.rc2/lib/active_record/inheritance.rb:65:in `new'
from /var/lib/gems/2.3.0/gems/protected_attributes-1.1.3/lib/active_record/mass_assignment_security/reflection.rb:8:in `build_association'
from /var/lib/gems/2.3.0/gems/protected_attributes-1.1.3/lib/active_record/mass_assignment_security/associations.rb:7:in `build_record'
from /var/lib/gems/2.3.0/gems/protected_attributes-1.1.3/lib/active_record/mass_assignment_security/associations.rb:25:in `build'
from /var/lib/gems/2.3.0/gems/protected_attributes-1.1.3/lib/active_record/mass_assignment_security/associations.rb:64:in `build'
from (irb):2
from /var/lib/gems/2.3.0/gems/railties-5.0.0.rc2/lib/rails/commands/console.rb:65:in `start'
from /var/lib/gems/2.3.0/gems/railties-5.0.0.rc2/lib/rails/commands/console_helper.rb:9:in `start'
from /var/lib/gems/2.3.0/gems/railties-5.0.0.rc2/lib/rails/commands/commands_tasks.rb:78:in `console'
from /var/lib/gems/2.3.0/gems/railties-5.0.0.rc2/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
from /var/lib/gems/2.3.0/gems/railties-5.0.0.rc2/lib/rails/commands.rb:18:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'

这是我在做的事情，还是 Rails5 疯了？

模型相关栏目：

item_type.rb

class ItemType < ActiveRecord::Base
    ## Relationships
    belongs_to :item_collection
    has_many :item_abilities
    has_many :item_instances

    accepts_nested_attributes_for :item_abilities

    ...
end

item_instance.rb

class ItemAbility < ActiveRecord::Base
    # Relationships
    belongs_to :item_type
   ...
end

Ruby版本：

ruby 2.3.1p112 (2016-04-26) [x86_64-linux-gnu]

Answer 1

是 protected_attributes gem，在 Rails 3->4 天后仍然徘徊，导致了上述问题。

我在 protected_attributes gem 网站上发布了一个错误，他们回复说 gem 将在 Rails 5.

中不受支持

如果其他人遇到此问题，Rails 'proper' 可以在此处找到解决此问题的方法：How is attr_accessible used in Rails 4? or here: http://api.rubyonrails.org/classes/ActionController/StrongParameters.html

感谢@oreoluwa 为我指明了正确的方向

Rails 5 上 Ruby 中的 build() 发生了什么

What happened to build() in Ruby on Rails 5

ruby

ruby-on-rails

attr-protected

ruby-on-rails-5