Rails 4 允许嵌套属性不创建/更新答案

【问题标题】：Rails 4 permit nested attributes doesn't create/updateRails 4 允许嵌套属性不创建/更新
【发布时间】：2013-08-20 19:55:17
【问题描述】：

我将我的 rails 应用程序（-v3.2.13）转换为 rails 4。我使用继承的资源 gem 的覆盖操作（创建！和更新！）。我允许参数的整个哈希，但它不会创建/更新嵌套属性。我需要允许参数的整个哈希。当我尝试时，我收到以下错误。帮我解决这个问题。

参数

{"foo"=>{"name"=>"1@1", "detail"=>"123", foo1_attributes"=>{"0"=>{"_destroy"=>"", "name"= >"John", "url"=>"johnsmith.blogspot.com",foo2_attributes"=>{"0"=>{"min_time"=>"0", "max_entry"=>"340"}}, " foo3_attributes"=>{"_destroy"=>"", "hours"=>"01", "minutes"=>"00"}, "status"=>"ACTIVE"}}, "foo4_attributes"=>{" 0"=>{"image"=>"0","id"=>"1097"}}}, "commit"=>"保存", "foo_id"=>"13", "id"=>" 1467"}

我的控制器

def update
 update! do |success, failure|
  success.html { redirect_to foo_path }
 end
end

protected

def resource_params
 params.permit!
end

Foo 模型

accepts_nested_attributes_for : foo1,foo2,foo3,foo4
has_many :foo1
has_many :foo2
has_many :foo3
has_many :foo4

追踪：

 Completed 500 Internal Server Error in 3686ms

 ArgumentError (wrong number of arguments (6 for 1..2)):
  app/controllers/foo_controller.rb:160:in `update'

 protected_attributes (1.0.3) lib/active_record/mass_assignment_security/persistence.rb:60:in `update_attributes'
inherited_resources (1.3.1) lib/inherited_resources/base_helpers.rb:78:in `update_resource'
inherited_resources (1.3.1) lib/inherited_resources/actions.rb:45:in `update'
app/controllers/partner_modules_controller.rb:160:in `update'
actionpack (4.0.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.0.0) lib/abstract_controller/base.rb:189:in `process_action'
actionpack (4.0.0) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.0.0) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (4.0.0) lib/active_support/callbacks.rb:445:in `block (2 levels) in _run__2668227825050344147__process_action__callbacks'
activesupport (4.0.0) lib/active_support/callbacks.rb:212:in `block in _conditional_callback_around_4134'
rails-observers (0.1.2) lib/rails/observers/action_controller/caching/sweeping.rb:73:in `around'
activesupport (4.0.0) lib/active_support/callbacks.rb:283:in `_callback_around_4133'
activesupport (4.0.0) lib/active_support/callbacks.rb:211:in `_conditional_callback_around_4134'
activesupport (4.0.0) lib/active_support/callbacks.rb:444:in `block in _run__2668227825050344147__process_action__callbacks'
activesupport (4.0.0) lib/active_support/callbacks.rb:215:in `_conditional_callback_around_4135'
activesupport (4.0.0) lib/active_support/callbacks.rb:443:in `_run__2668227825050344147__process_action__callbacks'
activesupport (4.0.0) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.0) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (4.0.0) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in `block in instrument'
activesupport (4.0.0) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.0.0) lib/active_support/notifications.rb:159:in `instrument'
actionpack (4.0.0) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.0.0) lib/action_controller/metal/params_wrapper.rb:245:in `process_action'
activerecord (4.0.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.0.0) lib/abstract_controller/base.rb:136:in `process'
actionpack (4.0.0) lib/abstract_controller/rendering.rb:44:in `process'
actionpack (4.0.0) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.0.0) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.0.0) lib/action_controller/metal.rb:231:in `block in action'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in `call'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:80:in `dispatch'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:48:in `call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:71:in `block in call'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in `each'
actionpack (4.0.0) lib/action_dispatch/journey/router.rb:59:in `call'
actionpack (4.0.0) lib/action_dispatch/routing/route_set.rb:655:in `call'
newrelic_rpm (3.6.6.147) lib/new_relic/rack/error_collector.rb:43:in `call'
bullet (4.6.0) lib/bullet/rack.rb:13:in `call'
newrelic_rpm (3.6.6.147) lib/new_relic/rack/error_collector.rb:43:in `call'
newrelic_rpm (3.6.6.147) lib/new_relic/rack/agent_hooks.rb:22:in `call'
newrelic_rpm (3.6.6.147) lib/new_relic/rack/browser_monitoring.rb:16:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `catch'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.5.2) lib/rack/etag.rb:23:in `call'
rack (1.5.2) lib/rack/conditionalget.rb:35:in `call'
rack (1.5.2) lib/rack/head.rb:11:in `call'
remotipart (1.2.1) lib/remotipart/middleware.rb:27:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/flash.rb:241:in `call'
rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in `call'
activerecord (4.0.0) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.0.0) lib/active_support/callbacks.rb:373:in `_run__994999873434308059__call__callbacks'
activesupport (4.0.0) lib/active_support/callbacks.rb:80:in `run_callbacks'
actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.0.0) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.0.0) lib/rails/rack/logger.rb:21:in `block in call'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `block in tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in `tagged'
activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `tagged'
railties (4.0.0) lib/rails/rack/logger.rb:21:in `call'
quiet_assets (1.0.2) lib/quiet_assets.rb:18:in `call_with_quiet_assets'
actionpack (4.0.0) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.5.2) lib/rack/methodoverride.rb:21:in `call'
rack (1.5.2) lib/rack/runtime.rb:17:in `call'
rack (1.5.2) lib/rack/lock.rb:17:in `call'
actionpack (4.0.0) lib/action_dispatch/middleware/static.rb:64:in `call'
railties (4.0.0) lib/rails/engine.rb:511:in `call'
railties (4.0.0) lib/rails/application.rb:97:in `call'
rack (1.5.2) lib/rack/content_length.rb:14:in `call'
thin (1.5.1) lib/thin/connection.rb:81:in `block in pre_process'
thin (1.5.1) lib/thin/connection.rb:79:in `catch'
thin (1.5.1) lib/thin/connection.rb:79:in `pre_process'
thin (1.5.1) lib/thin/connection.rb:54:in `process'
thin (1.5.1) lib/thin/connection.rb:39:in `receive_data'
eventmachine (1.0.3) lib/eventmachine.rb:187:in `run_machine'
eventmachine (1.0.3) lib/eventmachine.rb:187:in `run'
thin (1.5.1) lib/thin/backends/base.rb:63:in `start'
thin (1.5.1) lib/thin/server.rb:159:in `start'
rack (1.5.2) lib/rack/handler/thin.rb:16:in `run'
rack (1.5.2) lib/rack/server.rb:264:in `start'
railties (4.0.0) lib/rails/commands/server.rb:84:in `start'
railties (4.0.0) lib/rails/commands.rb:78:in `block in <top (required)>'
railties (4.0.0) lib/rails/commands.rb:73:in `tap'
railties (4.0.0) lib/rails/commands.rb:73:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<main>'

【问题讨论】：

params.require(:foo).permit(:attr_of_foo, :another_attr_of_foo, :foo1_attributes => [:attr_of_foo1, :more_attr_of_foo1], ..so forth) 不适合你？
@jo3w 是的，我尝试使用params.requir(:foo).permit(:name,:detail,foo1_attributes: [:name, :url])，但我得到错误的参数数量错误。我需要允许整个哈希。我在这里遗漏了什么吗？
stackoverflow.com/questions/17371334/…的可能重复

标签： ruby-on-rails ruby-on-rails-4

【解决方案1】：

我遇到了类似的问题。尝试执行以下操作。假设您需要更新 foo1.将此用于您的强参数。

def foo_params
  params.require(:foo).permit(:foo1_attributes => [:bar1 , :bar2])
end

更新时间。

def update  
  if @foo.update_attributes!(foo_params)      
    redirect_to foo_path
  else
    render foo1_edit_path
  end
end

【讨论】：

【解决方案2】：

你好，你必须这样使用它：

params.require( :foo ).permit( :name, :details, foo1_attributes: [ :_destroy, :name, :url, :id ], foo2_attributes: [ :_destroy, :min_time, :max_entry, :id ] )

它可能会解决您的问题。

【讨论】：

这里记住嵌套属性的 id 在创建的情况下是不需要的，但是在更新嵌套属性时它是强制性的，否则它会为你创建一个新的副本。这就是为什么我在嵌套属性允许字段中添加 id 字段

【解决方案3】：

这可能有点晚了，但我自己也遇到了。希望它会节省别人一些时间。

使用 Rails 4.2.1

这里其他答案的问题是他们没有考虑到foo1_attributes 的值有一个array：

（来自 OP 的扩展示例）

foo1_attributes"=> {
  "0"=> {
     "_destroy"=>"", "name"=>"John", "url"=>"johnsmith.blogspot.com"
  }
}

因此，您需要同时permit foo1_attributes 和foo1_attributes[n]

这是我在项目中成功实现类似功能的方法：

（格式化为上面的 OP 示例）

def resource_params
  params.require(:foo)
    .permit(
      :id,
      :name,
      :detail,

      # has_many: :foo1s (Nested Attributes)
        { foo1_attributes: [
          # and the values for each `foo1` in `foo1_attributes`
          [
            :name,
            :url
          ]
        ]},

      # has_many: :foo2s (Nested Attributes)
        { foo2_attributes: [
          # and the values for each `foo2` in `foo2_attributes`
          [
            :min_time,
            :max_entry
          ]
        ]}

      # etc...
    )

还有一些注意事项...

The code for nested attributes which are arrays may need to be placed at the end of the permit
Depending on your implementation, you may need to also include the id for each (see the top rated comment for this answer)
我的具体实现涉及到has_many :through
如果您打算删除 :_destroy，还需要包含它们

【讨论】：

【解决方案4】：

如Strong Parameters README中所述，您可以使用permit!方法将参数的整个哈希列入白名单，如下所示：

params.require(:foo).permit!

在执行此操作时，请记住链接自 README 文档中的以下引用：

使用许可证时应格外小心！因为它将允许批量分配所有当前和未来的模型属性。

【讨论】：

它不起作用。我仍然收到错误数量的参数错误。
发生此错误时，您能否在问题中发布完整的跟踪信息。
@Mano，是吗？应该还有更多，因为我没有看到您所说的错误。
@Mano，请尝试使用resource_params 参数调用update!，即在您的更新操作中执行update!(resource_params) do |success, failure|
天哪，谢谢！我一直在写关于完全非关键模型的无休止的 permit(.....) 调用太久了。没想到这么简单！

【解决方案5】：

用这个替换你当前的强参数：

def permitted_params
    params.permit(:widget => [:permitted_field, :other_permitted_field])
end

【讨论】：

【解决方案6】：

我相信您的resource_params 方法应该被称为permitted_params。更多关于如何处理强参数的细节在the Inherited Resources documentation。

【讨论】：

【解决方案7】：

我不认为这是一个与参数相关的严重错误。在 Rails 4.0 中，如果参数没有被列入白名单，它会静默失败并且不会创建对象。不久前我遇到了这个错误，我不知道如何修复它，但是你能发布你的 routes.rb 文件，并在你的控制器中包含 new 和 create 方法吗？我很确定您的错误在于您的资源嵌套。

【讨论】：