[英]Rails 3 - how to validate model without database?
我有控制器家里有这两个动作:
resources :home do
collection do
get 'index'
get 'contact'
end
end
和模型:
class Home
include ActiveModel::Validations
include ActiveModel::Conversion
extend ActiveModel::Naming
attr_accessor :name, :message
validates :name, :presence => {:message => 'Name cannot be blank.'}, :allow_blank => true, :length => {:minimum => 2, :maximum => 40}
validates :message, :presence => {:message => 'Message cannot be blank.'}, :allow_blank => true, :length => {:minimum => 10}
def initialize(attributes = {})
attributes.each do |name, value|
send("#{name}=", value)
end
end
def persisted?
false
end
end
控制器:
class HomeController < ApplicationController
def index
end
def contact
@home = Home.new
end
end
以及表单( /views/home/contact.html.erb )
<%= form_for(@home, :validate => true) do |f| %>
<% if @home.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@home.errors.count, "error") %> prohibited this role from being saved:</h2>
<ul>
<% @home.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :message %><br />
<%= f.text_field :message %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
我想像情况一样验证表单,如果模型具有DB表,但是不幸的是,我没有这种情况的经验,我有一个没有DB表的模型,需要用来验证表单...我是仍然收到错误
undefined method `to_key' for nil:NilClass
谁能帮助我,如何使其正常工作?
谢谢
我建议您观看/阅读此railscast http://railscasts.com/episodes/219-active-model?language=zh-CN&view=asciicast ,这也可以解释您的例外情况
另外,我看不到您的创建操作。 当create操作失败并再次呈现表单时,是否设置了变量?
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