[英]Ruby on Rails - Populate database record based on drop down selection
我對Rails相對較新,並創建了我的第一個應用程序,它是一個引用工具。
我目前正在使用3個表 - 產品,訂單和Order_lines。 產品保持我們產品的當前價格 - 包括成本。 訂單持有訂單的外殼,最終將其綁定到客戶表。 Order_lines包含所有order_lines - 並且視圖是根據Order_lines和Orders之間的關系和匹配索引填充的。
目前,該視圖還使用Products和Order_Lines之間的連接來填充價格。 但是,這不允許我存儲歷史數據(如果我在產品表中更改價格,那么之前創建的所有order_lines都會以新價格更新) - 所以我想要一個人從中選擇產品下拉菜單 - 以及系統提取該產品的當前價格/成本 - 並將其添加到訂單行。
產品表包含4列labed:prod_nrc_cost,prod_nrc_price,prod_mrc_cost,prod_mrc_price
Order_lines表現在有nrc_cost_line,nrc_price_line,mrc_cost_line,mrc_price_line。
當他們選擇產品555時 - 我希望它在產品表中查找產品555的價格 - 並在Order_lines表的相應列中填寫這4個價格,並保存它。 如果我能夠在頁面上填充它(讓人們能夠根據需要調整定價),然后將其發送到控制器以保存,那將是很好的。
這有道理嗎?
如果我要留下任何東西,請告訴我。
/orders/show.html.erb文件
<%= form_for(@order_line) do |f| %>
<% if false %>
<% if @order_line.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@order_line.errors.count, "error") %> prohibited this order_line from being saved:</h2>
<ul>
<% @order_line.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<% end %>
<%= f.hidden_field :order_id, class: 'form-control' %>
<%= f.hidden_field :order_num, :value=>@order.order_num, class: 'form-control' %>
<%= f.hidden_field :visible, class: 'form-control', :value=>true, :checked=>true %>
<% if @order_lines.present? %>
<%= f.hidden_field :line_num, :value=>@order_lines.maximum("line_num")+1, class: 'form-control' %>
<% else %>
<%= f.hidden_field :line_num, :value=>1, class: 'form-control' %>
<% end %>
<div class="row">
<div class="field col-md-2 form-group">
<%= f.label :Product %><br>
<%= f.collection_select(:product_id, Product.all, :id, :prod_name, {:prompt => 'Select Product'}, {:id => 'product_id'}) %>
</div>
<div class="field col-md-2 form-group">
<%= f.label :quantity %><br>
<%= f.number_field :quantity, class: 'form-control' %>
</div>
<div class="field col-md-2 form-group">
<%= f.label :NRC %><br>
<%= f.number_field :nrc_price_line, class: 'form-control' %>
</div>
<div class="field col-md-2 form-group">
<%= f.label :MRC %><br>
<%= f.number_field :mrc_price_line, class: 'form-control' %>
</div>
<div class="field col-md-2 form-group">
<%= f.label :discount %><br>
<%= f.number_field :discount, class: 'form-control' %>
</div>
<div class="field col-md-2 form-group">
<%= f.label :notes %><br>
<%= f.text_field :notes, class: 'form-control' %>
</div>
<div class="actions col-md-2" style="padding-top:25px;">
<%= f.submit "Add New Line", class: 'btn btn-primary' %>
</div>
</div>
</div>
<% end %>
orders_controller.rb文件
class OrdersController < ApplicationController
before_action :set_order, only: [:show, :edit, :update, :destroy]
def orders
@order = Order.find(params[:id])
@order_lines = @orders.order_lines
end
# GET /orders
# GET /orders.json
def index
@orders = Order.all
end
# GET /orders/1
# GET /orders/1.json
def show
@order = Order.find(params[:id])
@order_lines = @order.order_lines
@order_line = OrderLine.new(:order_id=>params[:id])
@product_categories = @order_lines.product
end
def update_price
@product = Product.find(params[:product_id])
respond_to do |format|
format.js
end
end
# GET /orders/new
def new
@order = Order.new
end
# GET /orders/1/edit
def edit
end
# POST /orders
# POST /orders.json
def create
@order = Order.new(order_params)
respond_to do |format|
if @order.save
format.html { redirect_to @order, notice: 'Order was successfully created.' }
format.json { render action: 'show', status: :created, location: @order }
else
format.html { render action: 'new' }
format.json { render json: @order.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /orders/1
# PATCH/PUT /orders/1.json
def update
respond_to do |format|
if @order.update(order_params)
format.html { redirect_to @order, notice: 'Order was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: @order.errors, status: :unprocessable_entity }
end
end
end
# DELETE /orders/1
# DELETE /orders/1.json
def destroy
@order.destroy
respond_to do |format|
format.html { redirect_to orders_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_order
@order = Order.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def order_params
params.require(:order).permit(:emp_id, :cust_id, :order_num)
end
end
order.rb模型
class Order < ActiveRecord::Base
has_many :order_lines
has_many :product_categories, through: :order_lines
has_many :products, through: :order_lines
end
首先,使用product_id將數據屬性添加到產品選擇器
您可以獲取下拉列表的更改事件的價格信息:在某些Coffeescrript文件中:
$('.your_selector').change ->
product_id = $(this).data('product_id')
$.ajax(
type: 'POST'
url: "/product_price_finder"
product_id: product_id
success: ( data, status, xhr ) ->
)
的routes.rb
post "/product_price_finder/:product_id" => "products#update_price"
products_controller.rb
def update_price
@product = Product.find(params[product_id:])
respond_to do |format|
format.js
end
end
在views / products / update_price.js中
var product = $("#product_<%= @product.id %>")
// update the price with Javascript
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