按下创建按钮并获取值字段以将其插入到form_for

Question

ERROR

Started POST "/products" for 127.0.0.1 at 2017-08-05 01:23:20 -0700

Processing by ProductsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"WcfuzGz2ZaEpFmagKYTm3feGTaZxNFPlTkLu/epw7fWObs+pdO4McXw9cLUNjTguav0i97rJR1sLhL5Fk+mk0g==", "product_attribute"=>{"name"=>"RAM 2355 Ghz", "size"=>"4GB", "description"=>"Its a very gooooooooood Ram"}, "value"=>"1", "commit"=>"Create"}

(0.1ms)  begin transaction

(0.1ms)  rollback transaction

Rendering products/new.html.erb within layouts/application

Rendered products/new.html.erb within layouts/application (2.2ms)

Completed 200 OK in 68ms (Views: 63.6ms | ActiveRecord: 0.1ms)

描述

填写表单后，每当我点击“创建”按钮时，我都会收到上述错误。

产品控制器

class ProductsController < ApplicationController

def new
    @product = ProductAttribute.new
    @value = params[:value]
end

def create
    @product = ProductAttribute.new(product_params)
    if @product.save
        redirect_to statics_url
    else
        render 'new'
    end
end


private

def product_params


params.require(:product_attribute).permit(:name,:value,:size,:description)
    end
end

静态控制器

  class StaticsController < ApplicationController

    def index
        @products = Product.all
    end

    def new
        @product = Product.new
    end

    def show
        @product = Product.find(params[:id])
        @attributes = ProductAttribute.where(value: @product.value)
    end

    def create
        @product = Product.new(product_params)
        if @product.save
            redirect_to root_url
        else
            render 'new'
        end
    end

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

    def update
        @product = Product.find(params[:id])
        if @product.update(product_params)
            redirect_to root_url
        else
            render 'edit'
        end
    end

    private

        def product_params
            params.require(:product).permit(:name,:value)
        end 
end

静态视图show.html.erb

<h1>Product listing now</h1>

<% @attributes.each do |attribute| %>
    <li><%= attribute.name%></li>
    <li><%= attribute.value%></li>
    <li><%= attribute.size%></li>
    <li><%= attribute.description%></li>
<% end %>

<%= link_to "Create New Product Attributes", new_product_path(value: 
@product.value) %>

静态视图new.html.erb

<h1> New Product Creation </h1>

<%= form_for(@product, url: statics_path) do |f| %>
    <%= f.label :name %>
    <%= f.text_field :name, class: 'form-control' %>

    <%= f.label :value %>
    <%= f.text_field :value, class: 'form-control' %>

    <%= f.submit "Create", class: "btn btn-primary" %>
<% end %>

产品视图new.html.erb

<h1>Add the New Product Attribute</h1>

<%= form_for(@product, url: products_path) do |f|%>
    <%= f.label :name %>
    <%= f.text_field :name, class: 'form-control' %>

    <%= hidden_field_tag :value, @value %>

    <%= f.label :size %>
    <%= f.text_field :size, class: 'form-control' %>

    <%= f.label :description %>
    <%= f.text_field :description, class: 'form-control' %>

    <%= f.submit "Create", class: 'btn btn-primary' %>
<% end %>

说明

我要做的是，我通过new_static_path传递value属性（值：@ product.value）。我正在尝试使用现有值字段（这是主键）创建新的Product属性字段。 例如：Ram（父字段） - ＆gt; （许多具有共同值属性的子字段）。我在产品的视图new.html.erb中使用hidden_​​field_tag，以便它将从控制器派生。 （我对此感到困惑）。

Answer 1

I found out the answer by doing thorough research on stack overflow guys,

<%= f.hidden_field :value, :value => params[:value] %>

i had to specify the value using hash for options.

Thank you have a nice day.

Answer 2

你也可以尝试这样的事情：

def new
    @product = Product.new(value: params[:value])
end

这将允许Rails将值param放在product_attribute哈希中。您还可以更改表单值名称以匹配预期值

<input ... name="[product][value]" ... >

我会选择第一个选项，即。