rails 4 before_actions 带动态参数

Question

如何使用动态参数设置 before_action 方法，我一直收到错误消息 参数数量错误（0 代表 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

先谢谢你

Answer 1

你可以这样做：

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

试试这个。当您需要在操作之前设置任何值或其他内容时，上述方法有效。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 只是在这两个操作之前调用，这对你的情况没有用。

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