Question

让我说我将数组保存到我的模型中。有没有办法为它添加属性？

我正在运行Property.create(property_params)以将数组的实例保存到我的模型中

是否有额外的属性附加到property_params但未在json中传递？假设我想将创建方法中设置的全局变量currentuserid传递给.create，并将其与user_id一起保存到模型property_params中的属性中？

我尝试在property_params上使用.merge，但它没有用。我想我需要将它传递给数组？

这可能吗？

def create
 currentuserid = 4
 property_items = PropertyItem.create(property_params)
end

private

  def property_params
    params.permit(property: [:houses, :id, :father, :mother, :height, :children, :pets]).require(:property)
  end

这是我的json：

"property":[
    {
         "houses":"1",
         "id":"5",
         "father":"Jerry",
         "mother":"Tanya",
         "height":281,
         "children":2,
         "pets":24
      },
      {
         "houses":"3",
         "id":"5",
         "father":"Rob",
         "mother":"Anne",
         "height":726,
         "children":1,
         "pets":55
      }
   ]
}

Answer 1

找到答案here，您可以使用合并

将其插入参数定义中

private

  def property_params
    params.require(:property).permit(:some_attribute).merge(user_id: current_user.id)
  end

或

def create 
  @property_items = PropertyItem.create(property_params) 
  @property_items.currentuserid = 4 
  #... 
end

Answer 2

了解您正在尝试做什么，如何在模型中处理此问题以及为什么要尝试这样做会有所帮助。

当你require(:property)时，结果是数据结构嵌套了比:property更深的一层，这是一个params哈希数组。这就是为什么你不能merge或permit之后致电require的原因。因为数组不会对这些方法做出响应。如果PropertyItem是ActiveRecord个对象，那么您将很难将数组传递给create并让它发挥作用。

hash = {
  "property" => [
    {
      "houses" => "1",
      "id" => "5",
      "father" => "Jerry",
      "mother" => "Tanya",
      "height" => 281,
      "children" => 2,
      "pets" => 24
    },
    {
      "houses" => "3",
      "id" => "5",
      "father" => "Rob",
      "mother" => "Anne",
      "height" => 726,
      "children" => 1,
      "pets" => 55
    }
  ]
}

params = ActionController::Parameters.new(hash)

# => <ActionController::Parameters {"property"=>[{"houses"=>"1", "id"=>"5", "father"=>"Jerry", "mother"=>"Tanya", "height"=>281, "children"=>2, "pets"=>24}, {"houses"=>"3", "id"=>"5", "father"=>"Rob", "mother"=>"Anne", "height"=>726, "children"=>1, "pets"=>55}]} permitted: false>

params.permit(property: [:houses, :id, :father, :mother, :height, :children, :pets]).require(:property)

# => [<ActionController::Parameters {"houses"=>"1", "id"=>"5", "father"=>"Jerry", "mother"=>"Tanya", "height"=>281, "children"=>2, "pets"=>24} permitted: true>, <ActionController::Parameters {"houses"=>"3", "id"=>"5", "father"=>"Rob", "mother"=>"Anne", "height"=>726, "children"=>1, "pets"=>55} permitted: true>]

首先将currentuserid合并到params中，然后只调用permit而不require，这样就可以获得我认为您正在寻找的内容。

params.merge(currentuserid: 1).permit(:currentuserid, property: [:houses, :id, :father, :mother, :height, :children, :pets])

# => <ActionController::Parameters {"currentuserid"=>1, "property"=>[<ActionController::Parameters {"houses"=>"1", "id"=>"5", "father"=>"Jerry", "mother"=>"Tanya", "height"=>281, "children"=>2, "pets"=>24} permitted: true>, <ActionController::Parameters {"houses"=>"3", "id"=>"5", "father"=>"Rob", "mother"=>"Anne", "height"=>726, "children"=>1, "pets"=>55} permitted: true>]} permitted: true>

但我认为一个重要的问题仍然是你究竟想做什么，为什么？

在rails中将属性添加到.create

2 个答案: