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资源说明：Rails plugin to dynamically add associated objects without JavaScript
EnhancedNestedForms
===================
Install
=======
script/plugin install git://github.com/lassej/enhanced_nested_forms.git
Example
=======
Say you have two models:
class Project < ActiveRecord::Base
has_many :tasks
accepts_nested_attributes_for :tasks
end
class Task < ActiveRecord::Base
column :project_id
belongs_to :project
end
Without this plugin you either have to use javascript to add new tasks to a project or you must
insert some empty Task objects and use the :reject_if option of the accepts_netsted_attributes_for
method to prevent the empty objects from being saved. Both alternatives are quite ugly.
Using the enhanced_nested_forms plugin allows you to add a button to your form which triggers building
a new associated object and prevents the whole object tree from being saved.
submit_tag "Add Task", :name => "project[_build_tasks]"
or
image_submit_tag "plus.png", :name => "project[_build_tasks]"
The controller code can stay as it was. If a build-something button was clicked, a before_save callback
will return false and the form will be re-rendered with the unsaved object.
def create
@project = Project.new( params[:project])
if @project.save
redirect_to @project
else
render "new"
end
end
def update
@project = Project.find( params[:id])
if @project.update_attributes( params[:project])
redirect_to @project
else
render "new"
end
end
Helper methods for the view, more tests and documentation will follow.
Copyright (c) 2009 [Lasse Jansen], released under the MIT license
本源码包内暂不包含可直接显示的源代码文件，请下载源码包。
