我在Daniel Kehoe的学习轨道书的第19章，并创建了一个表格。但是，当我故意制作错误以便测试验证时，不会出现任何消息。例如，当我提交一个空表单时，它只是呈现一个没有错误消息的新表单，当我输入错误的电子邮件地址时，没有＆＃39; @＆＃39;再次它似乎接受我的输入没有错误。所以我的问题是为什么验证不会引发任何错误信息？
这是我的模型contact.rb
class Contact
include ActiveModel::Model
attr_accessor :name, :email, :content
validates_presence_of :name
validates_presence_of :email
validates_presence_of :content
validates_format_of :email,
with: /\A[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}\z/i
validates_length_of :content, :maximum => 500
end
应用程序布局application.html.erb
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title><%= content_for?(:title) ? yield(:title) : "Workspace" %></title>
<meta name="description" content="<%= content_for?(:description) ? yield(:description) : "Workspace" %>">
<%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track' => 'reload' %>
<%= javascript_include_tag 'application', 'data-turbolinks-track' => 'reload' %>
<%= csrf_meta_tags %>
</head>
<body>
<header>
<%= render 'layouts/navigation' %>
</header>
<main role="main">
<%= render 'layouts/messages' %>
<%= yield %>
</main>
</body>
</html>
表单视图new.html.erb
<% content_for :title do %>Contact<% end %>
<h3>Contact</h3>
<div class="form">
<%= form_with(model: @contact) do |form| %>
<%= form.label :name %>
<%= form.text_field :name, autofocus: true %>
<br/>
<br/>
<%= form.label :email %>
<%= form.email_field :email %>
<br/>
<br/>
<%= form.label 'message' %>
<%= form.text_area :content, size: '40x5' %>
<br/>
<br/>
<%= form.submit 'Submit', class: 'submit' %>
<% end %>
</div>
contacts_controller.rb
class ContactsController < ApplicationController
def new
@contact = Contact.new
end
def create
@contact = Contact.new(secure_params)
if @contact.valid?
# TODO send message
flash[:notice] = "Message sent from #{@contact.name}."
redirect_to root_path
else
render :new
end
end
private
def secure_params
params.require(:contact).permit(:name, :email, :content)
end
end
布局助手_messages.html.erb
<%# Rails flash messages styled for Bootstrap 3.0 %>
<% flash.each do |name, msg| %>
<% if msg.is_a?(String) %>
<div class="alert alert-dismissible alert-<%= name.to_s == 'notice' ? 'success' : 'danger' %>">
<button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
<%= content_tag :div, msg, :id => "flash_#{name}" %>
</div>
<% end %>
<% end %>
编辑1：
当我在控制台中手动创建新联系人时，验证似乎有效。但是，应用程序在通过应用程序表单创建时未验证它们。请参阅下面有关创建新联系人的实验。
2.3.4 :002 > c=Contact.new
=> #<Contact:0x000000055741a8>
2.3.4 :003 > c
=> #<Contact:0x000000055741a8>
2.3.4 :004 > c.name='biggles2'
=> "biggles2"
2.3.4 :005 > c
=> #<Contact:0x000000055741a8 @name="biggles2">
2.3.4 :006 > c.valid?
=> false
2.3.4 :007 > c.email='biggldy@boggldy.com'
=> "biggldy@boggldy.com"
2.3.4 :008 > c
=> #<Contact:0x000000055741a8 @name="biggles2", @validation_context=nil, @errors=#<ActiveModel::Errors:0x0000000554a948 @base=#<Contact:0x000000055741a8 ...>, @messages={:email=>["can't be blank", "is invalid"], :content=>["can't be blank"]}, @details={:email=>[{:error=>:blank}, {:error=>:invalid, :value=>nil}], :content=>[{:error=>:blank}]}>, @email="biggldy@boggldy.com">
2.3.4 :009 > c.email
=> "biggldy@boggldy.com"
2.3.4 :010 > c.name
=> "biggles2"
2.3.4 :011 > c.content='this is some content and its not too long'
=> "this is some content and its not too long"
2.3.4 :012 > c.valid?
=> true
2.3.4 :013 > c
=> #<Contact:0x000000055741a8 @name="biggles2", @validation_context=nil, @errors=#<ActiveModel::Errors:0x0000000554a948 @base=#<Contact:0x000000055741a8 ...>, @messages={}, @details={}>, @email="biggldy@boggldy.com", @content="this is some content and its not too long">