Ruby on rails RubyonRails表单计算器

我想为我的应用程序构建一个计算器。在用户保存记录之前，它应该能够在表单上输入一些变量，并点击“计算”按钮查看“他需要多少个单元来构建一些东西”

我创建了一条自定义路线：

get 'product_stock_calculator/:product_id',       to: 'product_stocks#calculator'

class ProductStock < ActiveRecord::Base
  ...
end

class ProductStocksController < ApplicationController
...
   def calculator
     @product_stock = ProductStock.new
     @product_stock.product_id = params[:product_id]
   end
...
end

型号：

get 'product_stock_calculator/:product_id',       to: 'product_stocks#calculator'

class ProductStock < ActiveRecord::Base
  ...
end

class ProductStocksController < ApplicationController
...
   def calculator
     @product_stock = ProductStock.new
     @product_stock.product_id = params[:product_id]
   end
...
end

class-ProductStock

控制器：

get 'product_stock_calculator/:product_id',       to: 'product_stocks#calculator'

class ProductStock < ActiveRecord::Base
  ...
end

class ProductStocksController < ApplicationController
...
   def calculator
     @product_stock = ProductStock.new
     @product_stock.product_id = params[:product_id]
   end
...
end

class ProductStocksController

查看：

product_stocks/calculator.html.erb


<%= simple_form_for(@product_stock) do |f| %>

  <div class="form-inputs">
    <%= f.input :product_id, label: 'Producto', collection: Product.all, required: true %>
    <%= f.input :number_of_boxes, label: 'Units to build', required: true %>
  </div>

  <div class="form-actions">
    <%= f.button :submit %>
  </div>
<% end %>

product\u stocks/calculator.html.erb

---

如何在不保存记录的情况下提交表单、进行一些计算并呈现视图以显示计算结果？

与您所做的任何事情的方式相同

将表单提交到指向控制器操作的路由，在该路由中，您将根据参数执行计算

例如：

routes.rb:

match '/calculate', to "productstocks#calculate", via: 'post', as: :calculate

在控制器中：

def calculate
    @productstock = Productstock.new(productstock_params) # strong parameters here
    @result = params[:productstock][:param1] * params[:productstock][:param2] # for example
    render 'calculator' # this will render with the unsaved 
                        # new @producstock and you can use @result too in your view
end

---

您将表单的操作设置为

计算路径

，看起来您真的想在自定义操作中使用“表单标签”，而不是尝试基于资源的路由。可能需要更多信息才能正确回答。