轨道4创建相关的对象上的保存 [英] Rails 4 Create Associated Object on Save

问题描述

我怎么能自动创建多个关联的对象就在我保存一个新的主对象？

例如

在轨道4，我有三个对象：企业 预算和类别

。

 ＃应用程序/模型/ business.rb
一流的商业与LT; ActiveRecord的::基地
   #attrs ID，名称
   的has_many：预算
结束＃应用程序/模型/ budget.rb
一流的预算和LT; ActiveRecord的::基地
   #attrs ID，business_id，部门标识，值
   belongs_to的：业务
   belongs_to的：类别
结束＃应用程序/模型/ category.rb
类分类和LT; ActiveRecord的::基地
   #attrs ID，名称
   的has_many：预算
结束
 

当我创建一个新的业务，节省了新的业务后，我想以原子为每个类别一份财政预算案，并给它$ 0值。这样一来，当我去显示或编辑一个新的业务，它已经具有相关的类别和预算，然后可以进行编辑。因此，在创建新的业务，多种新的预算将被创建，每个类别，各有值为0。

我读这篇文章：<一href=\"http://stackoverflow.com/questions/3739158/rails-3-how-add-a-associated-record-after-creating-a-primary-record-books-aut\">Rails 3，如何创建主记录后，添加相关的记录（书籍，自动添加BookCharacter）

和我想知道如果我要在业务模型中使用after_create回调，并有逻辑，那么在预算控制存在（不完全知道如何做到这一点），或者我是否应该添加逻辑来在该businesses_controller.rb 新有类似的东西叫：

  @business = Business.new
@categories = Category.all
@ categories.each做|类别|
      category.budget.build（：值=＆gt;中0时，：business_id = GT; @ business.id）
结束
 

解决方案

我结束了在所有类别中添加逻辑，以在业务控制create方法循环并创建一个预算只保存了。请注意，我是偷懒，没有把任何错误处理。

  DEF创建
    @business = Business.new（PARAMS [：业务]）    @Results = @ business.save    @categories = Categories.all    @ categories.each做|类别|
      category.budgets.create（：量=＆gt;中0时，：business_id = GT; @ business.id）
    结束
    做的respond_to |格式|
      ...
    结束
  结束
 

How can I create multiple associated objects automatically just after I save a new primary object?

For example

In Rails 4, I have three objects: Businesses, Budgets, and Categories.

#app/models/business.rb
class Business < ActiveRecord::Base
   #attrs id, name
   has_many :budgets
end

#app/models/budget.rb
class Budget < ActiveRecord::Base
   #attrs id, business_id, department_id, value
   belongs_to :business 
   belongs_to :category
end

#app/models/category.rb
class Category < ActiveRecord::Base
   #attrs id, name
   has_many :budgets
end

When I create a new Business, after saving the new Business, I would like to atomically create a Budget for each Category and give it value of $0. This way, when I go to show or edit a new Business, it will already have the associated Categories and Budgets, which can then be edited. Thus, upon creating a new Business, multiple new Budgets will be created, one for each Category, each with the value of 0.

I read this article: Rails 3, how add a associated record after creating a primary record (Books, Auto Add BookCharacter)

And I am wondering if I should use the after_create callback in the Business model and have the logic then exist in the Budgets controller (not exactly sure how to do this) or if I should add logic to the businesses_controller.rb in the 'new' call with something similar to:

@business = Business.new
@categories = Category.all
@categories.each do |category|
      category.budget.build(:value => "0", :business_id => @business.id)
end

解决方案

I ended up adding the logic to the create method in the Business controller to loop through all Categories and create a budget just after save. Note that I was lazy and didn't put in any error handling. :

  def create
    @business = Business.new(params[:business])

    @results = @business.save

    @categories = Categories.all

    @categories.each do |category|
      category.budgets.create(:amount => "0", :business_id => @business.id)
    end


    respond_to do |format|
      ...
    end
  end

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