Question

我有以下代码：

class SupportsController < ApplicationController
  before_action :set_support, only: [:show, :edit, :update, :destroy]
  ....

是否可以将字符串传递给方法set_support以应用于所有4种视图方法？对于视图中的每个方法，是否可以将不同的字符串传递给方法set_support？

Answer 1

before_action only: [:show, :edit, :update, :destroy] do
  set_support("value")
end

Answer 2

您可以使用lambda：

class SupportsController < ApplicationController
  before_action -> { set_support("value") }, 
    only: [:show, :edit, :update, :destroy]
  ...

Answer 3

简短的单行答案（我个人更喜欢回调）是：

before_action except:[:index, :show] { method :param1, :param2 }

另一个例子：

after_filter only:[:destroy, :kerplode] { method2_namey_name(p1, p2) }

Answer 4

您可以将lambda传递给before_action并将params[:action]传递给set_support方法，如下所示：

class SupportsController < ApplicationController
  before_action(only: [:show, :edit, :update, :destroy]) ->{|c| c.set_support params[:action]}
  ....

Answer 5

SupportsController

class SupportsController < ApplicationController    
  before_action only: [:show, :edit, :update, :destroy] { |ctrl|
    ctrl.set_support("the_value")
  }
...

ApplicationController

class ApplicationController < ActionController
  def set_support (value = "")
    p value
  end
...

Rails 4 before_action，将参数传递给调用方法

5 个答案: