轨道4个before_actions动态参数

Question

如何设置before_action方法与动态参数，可以一直收到错误错误的参数数目（0 1）

class PagesController < ApplicationController 
    before_action :set_categories 
    before_action :redirect_if_path_has_changed, only: [:products, :detail] 

    def home 
    end 

    def products 
    @category = Category.find(params[:id]) 
    @products = @category.products.order("created_at").page(params[:page]).per(6) 

    redirect_if_path_has_changed(products_by_category_path(@category)) 
    end 

    def detail 
    @product = Product.find(params[:id]) 

    redirect_if_path_has_changed(product_details_path(@product)) 
    end 

    private 

    def set_categories 
    @categories = Category.all 
    end 

    def redirect_if_path_has_changed(path_requested) 
    redirect_to path_requested, status: :moved_permanently if request.path != path_requested 
    end 
end 

前

Answer 1

谢谢您能做到这样的：

before_action only: [:products, :detail] do 
    redirect_if_path_has_changed("value") 
end 

试试这个。当你需要在动作之前设置任何值或其他东西时，上述工作。在你的情况下，你想首先从数据库中找到product或detail，然后你想重定向到那个路径。所以before_action只是在你的情况下没有用的两个动作之前调用。