Rails 模型 - 插入一条记录 - Ruby 方式 [英] Rails model - insert a record - Ruby way

问题描述

我对 Rails 4 很陌生.我创建了以下视图

I am very new to Rails 4. I have created following view

contact_us.html.erb

<%= form_tag({controller: "pages", action: "contact_us"}, method: "post", class: "nifty_form") do %>
<b> Add Product </b>
<br>
  <p>
    <%= label_tag  'Cname:' %>
    <%= text_field_tag 'cname', @cname %>
    <br>
    <%= label_tag  'Cdetail:' %>
    <%= text_field_tag 'cdetais', @cdetais %>
    <% #email_field_tag 'pdetail', @pdetail %>
  </p>
  <%= submit_tag "Save" %>
<% end %>

型号:contactu.rb

class Contactu < ActiveRecord::Base
end

pages_controller.rb

class PagesController < ApplicationController
  def index
  end

  def contact_us
    flash.now[:error] = ""

    if params[:commit]
      @cname=params[:cname]
      @cdetais=params[:cdetais]

      flash.now[:error] << "Pname cannot be blank<br/>" if @cname.nil? || @cname.empty?
      flash.now[:error] << "Cdetais cannot be blank<br/>" if @cdetais.nil? || @cdetais.empty?
    end

    Contactu.create(cname: @cname, cdetais: @cdetais)
  end
end

此代码有效.但是，我想知道有没有更好的方法?

This code works. But, I was wondering is there a better way?

我已经更改了代码，但现在它说#

I have changed the code, but now it says undefined method `join' for #

@contact_us = Contactu.create(cname: @cname, cdetais: @cdetais)

    if @contact_us.save
    flash.now[:notice] << "Information saved </br>"
    else
    flash.now[:error] = @contact_us.errors.join('<br>')
    end

推荐答案

当然还有更好的方法.

首先检查模型中是否存在给定的字段:

Firstly check if given fields are present in model:

class Contactu < ActiveRecord::Base
  validate :cname, presence: true
  validate :cdetails, presence: true
end

然后在您的控制器中:

@message = Contactu.create(params.permit(:cname, :cdetails))

if @message.save
  redirect_to blah, notice: "Thank's for the news"
else
  flash[:error] = @message.errors.to_a.join('<br>')
end

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