编辑：寻找这个：http ://diminishing.org/extending-formtastic-with-a-sprinkle-of-jquery （如果这有效，我会回答我自己的问题）
我已经开始通过formtastic创建一个进出型habtm（有很多并且属于很多）形式。但是我希望它对用户更灵活，这意味着如果您在一侧选择一个名称，您可以单击一个立即移动它的按钮（点击 ajax）或在提交表单后
（我使用的是formtastic，但在任何人的例子中都不需要）
我正在努力解决的是javascript，输入和输出按钮..
比较模型
class Comparison < ActiveRecord::Base
has_and_belongs_to_many :devices
end
设备型号
class Device < ActiveRecord::Base
has_and_belongs_to_many :comparisons
end
比较控制器
def edit
@comparison = Comparison.find(params[:id])
@devices = Device.find(:all, :select => 'id, device_name', :order => 'device_name')
@devices_selected = @comparison.devices.find(:all, :order => 'device_name', :conditions => ["id IN (?)", @devices])
@devices_not_selected = Device.find(:all, :order => 'device_name', :conditions => ["id NOT IN (?)", @devices_selected])
end
比较编辑视图
<% semantic_form_for @comparison do |f| %>
<% f.inputs do %>
<%= f.input :comparison_name %>
<%= f.input :description %>
<h3>
Select Devices
</h3>
<% f.inputs :class => 'inline_fields' do %>
<%= f.input :devices,
:collection => @devices_not_selected,
:label_method => :device_name,
:label => 'Add Devices',
:input_html => { :size => 20 },
:include_blank => false,
:hint => 'Select devices from this list to compare to the parent device' %>
<%= f.input :devices,
:collection => @devices_selected,
:label_method => :device_name,
:label => 'Remove Devices',
:input_html => { :size => 20 },
:include_blank => false,
:hint => 'Deselect devices from this list to take them off the comparison' %>
<% end %>
<% end %>
<%= f.buttons %>
<% end %>