如何使用DataMapper和Sinatra复选框？

Question

我正在尝试做一个简单的房间管理服务。房间有这些属性：

class Room 
    include DataMapper::Resource 
    validates_is_unique :number 

    property :id, Serial 
    property :number, Integer 
    property :guest, String 
    property :status, Enum[ :free, :occupied ], :default => :free 
end 

然后，我创建通过这个HAML形式

%form#new_message{:action => '/new', :method => 'post'} 
     %p 
      %input{:type => "text",  :id => "number", :name => "number"} 
      %input{:type => "text",  :id => "guest", :name => "guest"} 
      %input{:type => "checkbox", :id => "status", :name => "status", :value => "occupied"} 
      %input{:type => "submit", :value => "post"} 

一个新的空间这样

post '/new' do 
    content_type :json 
    @room = Room.new :guest => params[:guest], 
        :number => params[:number], 
        :status => params[:status] 
    if @room.save 
    { :number => @room.number, :guest => @room.guest, :status => @room.status }.to_json 
    end 
end 

当检查框：状态为“占领“但是当我放弃它时，对象不会保存。我认为它会工作，因为它默认为“免费”，但没有...

Answer 1

无论什么愚蠢的原因，复选框不会被提交，如果他们没有被点击。这意味着它们不在打击您的应用程序的哈希中。当你说:status => params[:status]你真的说：status => nil。既然你已经设置了一个值，它会检查你的枚举值，而nil不在你的枚举值中，所以它会失败验证。 （根据你是如何使用这个，看起来它应该是一个布尔值，称为“占用”或“可用”？）

无论如何，你可以明确地将其设置为空闲或不设置它完全可以，并让默认处理它。这是我在选中时选择的，并将其转变为大规模任务。我使用的代码如下。

require 'rubygems' 
require 'sinatra' 
require 'haml' 
require 'dm-core' 
require 'dm-validations' 
require 'dm-types' 
require 'dm-migrations' 
require 'sqlite3' 


configure do 
    class Room 
    include DataMapper::Resource 
    validates_uniqueness_of :number 
    property :id, Serial 
    property :number, Integer 
    property :guest, String 
    property :status, Enum[ :free, :occupied ], :default => :free 
    end 
    set :sessions , true 
    DataMapper::Logger.new($stdout, :debug) 
    DataMapper.setup(:default , "sqlite3://#{Dir.pwd}/development.sqlite3") 
    DataMapper.finalize 
    DataMapper.auto_upgrade! 
end 


get '/' do 
    @rooms = Room.all 
    haml :index 
end 

post '/new' do 
    p params 
    @room = Room.new params[:room] 
    if @room.save 
    session[:flash] = "room reserved" 
    redirect '/' 
    else 
    session[:flash] = @room.errors.to_a 
    redirect '/new' 
    end 
end 

get '/new' do 
    haml :new 
end 

__END__ 
@@layout 
!!! 
%html 
    #flash 
    = session[:flash].inspect 
    = yield 

@@new 
%form#new_message{:action => '/new', :method => 'post' , :name => 'room' } 
    %p 
    %input{:type => "text",  :id => "number", :name => "room[number]"} 
    %input{:type => "text",  :id => "guest", :name => "room[guest]"} 
    %input{:type => "checkbox", :id => "status", :name => "room[status]", :value => "occupied"} 
    %input{:type => "submit", :value => "post"} 

@@index 
%table 
    - @rooms.each do |room| 
    %tr 
     %td= room.number 
     %td= room.guest 
     %td= room.status 

Answer 2

查看您的网络表单的HTML源代码！应该有一个隐藏字段，设置选中复选框以“0”为默认值，如果没有人检查他们...

还看到： http://railscasts.com/episodes/17-habtm-checkboxes?autoplay=true（接近年底）