按创建按钮回滚事务并获取值字段以将其插入 form_for

Question

错误

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

每当我在填写表格后点击创建按钮时，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 %>

产品浏览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 %>

描述

我想做的是，我通过 new_static_path(value: @product.value) 传递 value 属性。我正在尝试使用现有值字段（这是主键）创建一个新的 Product 属性字段。例如：Ram(parent field) -> (many child field with common value attributes)。我在产品视图 new.html.erb 中使用了 hidden_field_tag，这样它将派生自控制器。（我对此感到困惑）。

Answer 1

我通过对堆栈溢出家伙的深入研究找到了答案，

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

我必须使用散列选项指定值。

谢谢你，祝你今天愉快。

Answer 2

您也可以尝试这样的操作：

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

这将允许 Rails 将值参数放入 product_attribute 散列中。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。

按创建按钮回滚事务并获取值字段以将其插入 form_for

Rollback transaction on pressing create button and fetching the value field to insert it into the form_for

html

ruby

ruby-on-rails

ruby-on-rails-3

错误

描述

产品控制器

静态控制器

静态视图show.html.erb

静态视图new.html.erb

产品浏览new.html.erb

描述