simple_form_for 如何将参数传递给控制器

Question

我想将参数从 event/id（显示页面）传递到我的 order_controller。

我使用simple_form_for传递event.id和促销代码 用户输入

#event.show.html.haml
= simple_form_for order_url, url: orders_path(@event, :promocode), method: :post do |f|
   = f.hidden_field :event_id, params: {id: @event.id}
   = f.input :promocode, value: :promocode, class: 'form-control', placeholder: "Enter your PromoCode"
   = f.submit 'APPLY PromoCode'

IDK 如果需要 hidden_field 通过 event_id

#order_controller
class OrdersController < ApplicationController
  before_action :order, only: %i[show]
  
  def index
    @orders = Order.all.order(created_at: :desc).page(params[:page]).per(5)
  end

  def show; end

  def create
    @order = Order.create(title: event.title, user_id: current_user.id, event_id: event.id, order_amount: event.price, order_currency: event.currency)
    if !promo.nil?
      redirect_to_order
    elsif @order.save
      redirect_to checkout_create_path(id: @order.id)
    else
      redirect_to event, alert: 'Something went wrong, try again later'
    end
  end
  
  def redirect_to_order
    promo_validate
    order_amount_promo_code = @order.order_amount - promo.promo_code_amount
    order.update(order_amount: order_amount_promo_code)
    redirect_to @order
  end

  def promo_validate
    if promo.present? && promo.promo_code_amount.positive? && promo.promo_code_currency == event.currency
      promo.update(order_id: @order.id)
    else
      redirect_to event, alert: "This PromoCode is invalid or Your PromoCode Currency doesn't match with Event"
    end
  end

  private

  def promo
    @promo ||= PromoCode.find_by(uuid: params[:promocode])
  end

  def event
    @event ||= Event.find(params[:id])
  end

  def order
    @order ||= Order.find(params[:id])
  end

  def order_params
    params.require(:order).permit(:title, :event_id, :promocode, :event)
  end

end

我正在使用方法 def event 和 def promo 从视图中获取此参数。我的路线也是这样。

资源：事件
资源：订单

Answer 1

我会嵌套路线：

resources :events do
  resources :orders, shallow: true
end

这在两个资源之间创建了一个明确的关系，只需查看 URL 就可以看出这一点。要创建与 even 绑定的订单，您可以向 /events/:event_id/orders.

发送 POST 请求

class EventsController
  def show
    # ..
    @order = @event.orders.new
  end
end

= simple_form_for [@event, @order] do |f|
  = f.input :promocode, value: :promocode, class: 'form-control', placeholder: "Enter your PromoCode"
  = f.submit 'APPLY PromoCode'

class OrdersController < ApplicationController
  # POST /events/:id/orders
  def create
    @event = Event.find(params[:event_id])
    @order = @event.orders.new(title: @event.title, user: current_user order_amount: @event.price, order_currency: @event.currency)
    begin
      @promo = PromoCode.find_by!(uuid: params[:order][:promocode])
    rescue ActiveRecord::RecordNotFound
      @order.errors.add(:promocode, 'is invalid')
    end

    if @order.save
      redirect_to checkout_create_path(id: @order.id)
    else
      redirect_to @event, alert: 'Something went wrong, try again later'
    end
  end
  # ...
end

除此之外，您对促销代码的处理非常不稳定。与其四处游荡并通过更新记录从“金额”中扣除回扣，不如同时存储原始销售价格和回扣，然后在结账时计算总额——这也应该单独存储。不这样做意味着记录保持得非常糟糕，可能会给您带来麻烦 - 涉及金钱时，请务必谨慎行事。

simple_form_for 如何将参数传递给控制器

simple_form_for how to pass params to controller

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