Rails的复杂的视图形式的has_many：通过协会 [英] Rails complex view form with has_many :through association

问题描述

我想创建一个菜谱Rails应用程序，但很困惑如何创建视图的形式和控制器逻辑。我有2个型号，配方和项目，在的has_many加入：通过与成分模型的关联如下：

I'm trying to create a rails app for recipes, but am confused on how to create the view forms and controller logic. I have 2 models, Recipe and Item, joined in a has_many :through association with an Ingredient model as follows:

class Recipe < ActiveRecord::Base
    has_many :ingredients
    has_many :items, :through => :ingredients
end

class Item < ActiveRecord::Base
    has_many :ingredients
    has_many :recipes, :through => :ingredients
end

class Ingredient < ActiveRecord::Base
    # Has extra attribute :quantity
    belongs_to :recipe
    belongs_to :item
end

本协会工作在控制台。例如：

This association works in the console. For example:

Recipe.create( :name => 'Quick Salmon' )
Item.create( :name => 'salmon', :unit => 'cups' )
Ingredient.create( :recipe_id => 1, :item_id => 1, :quantity => 3)

Recipe.first.ingredients
=> [#<Ingredient id: 1, recipe_id: 1, item_id: 1, quantity: 3]

Recipe.first.items
=> [#<Item id: 1, name: "salmon", unit: "cups"]

不过，我不知道如何创建新的配方视图，这样我可以在一个页面直接添加成分的配方。我是否需要使用 fields_for 或嵌套属性？如何构建视图的形式和控制器逻辑创建配方，具有配料，在一个页面？

However, I don't understand how to create the new recipe view so that I can add ingredients directly to a recipe in one page. Do I need to use fields_for or nested attributes? How do I build the view form and controller logic to create a recipe, with ingredients, in one page?

我on Rails的3.1.3。

I'm on Rails 3.1.3.

推荐答案

的 accepts_nested_attributes_for -method是你在找什么。
瑞安贝茨做了一个很好的 Railscast 就可以了。

The accepts_nested_attributes_for-method is what you are looking for. Ryan Bates has done an excellent Railscast on it.

您也应该检查<一个href=\"http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html\">documentation对于Active Record的嵌套属性

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