Rails Complex Form:选择和使用模板 [英] Rails Complex Form: selecting and working with templates

问题描述

class Project < ActiveRecord::Base 
  has_one :template 
end 

class Template < ActiveRecord::Base 
  belongs_to :project, foreign_key: "project_id" 
  belongs_to :admin
end 

class Admin < ActiveRecord::Base 
  has_many :templates
end 

鉴于我是用户，我想在创建新项目时选择一个模板.

Given I'm a user, I want to select a Template when creating a new Project.

然后我想编辑@project &@project.template 无需更改管理员的模板.

I then want to edit the @project & @project.template without changing the Admin's Template.

======问题========

======ISSUE========

我找不到显示如何操作的资源:

I haven't been able to find a resource that shows how to:

• 收集 Template.all 的 collection_select
• 将所选模板的属性(除了:id)传递给@project.build_template
• 创建与新项目关联的模板的新实例(包括关联和属性)

推荐答案

这是一种方法.首先，您需要在 Project new 操作中构建一个新模板.

Here is one way to do it. First, you need to build a new template in the Project new action.

template.build

然后添加collection_select.像这样:

Then add the collection_select. Something like this:

<%= f.collection_select(:random_virtual_attribute, Templates.all, :id, :name, {:include_blank => true}, {:multiple => false} ) %>

然后附加到选择上的更改事件.当它发生变化时，发出 JSON 请求以获取该特定模板.你可以使用respond_to和respond_with，http://davidwparker.com/2010/03/09/api-in-rails-respond-to-and-respond-with/.在 JSON 请求的回调中，设置您构建的模板的所有 fields_for.

Then attach to the change event on the select. When, it changes, make a JSON request to get that particular template. You can use respond_to and respond_with, http://davidwparker.com/2010/03/09/api-in-rails-respond-to-and-respond-with/. In the callback of the JSON request, set all of the fields_for of the template you built.

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