通过具有多次关联的关系来编辑/更新collection_select [英] edit/update collection_select with has-many-through association

问题描述

我有以下模型:RECIPE，TAG和TAGGING(联接表)

I have the following models: RECIPE, TAG and TAGGING (join table)

recipe.rb

recipe.rb

has_many :taggings
has_many :tags, through: :taggings
accepts_nested_attributes_for :taggings

tag.rb

has_many :taggings
has_many :recipes, through: :taggings

scope :diet, -> { where(type_id: 1).to_a }
scope :category, -> { where(type_id: 2).to_a }
scope :festivity, -> { where(type_id: 3).to_a }
scope :daily, -> { where(type_id: 4).to_a }

到目前为止一切正常.但是，在我的TAGS表中，我有一个名为"type_id"的字段，这为我的标签带来了一种分类.因此，我创建了一些范围"以区分彼此.

Everything normal so far. But, in my TAGS table I have a field called "type_id" which brings me a kind of categorization of my tags. So I've created some "scopes" to distinguish each other.

tagging.rb

tagging.rb

belongs_to :recipe
belongs_to :tag, :counter_cache => :recipes_count

recipes_controller.rb

recipes_controller.rb

def new
    @recipe = Recipe.new
    @recipe.tags.build
    @recipe.taggings.build(:recipe => @recipe)
end

def edit
end

我的表格

= f.fields_for :taggings, @recipe.taggings.build do |builder| 
    = builder.collection_select :tag_id, Tag.diet, :id, :name

= f.fields_for :taggings, @recipe.taggings.build do |builder| 
    = builder.collection_select :tag_id, Tag.category, :id, :name

= f.fields_for :taggings, @recipe.taggings.build do |builder| 
    = builder.collection_select :tag_id, Tag.festivity, :id, :name

= f.fields_for :taggings, @recipe.taggings.build do |builder| 
    = builder.collection_select :tag_id, Tag.daily, :id, :name

当我创建NEW RECIPE时，标记通常添加到联接表(标记)中.但是，当我编辑collection_select助手时，不会将该项目标记为已选中".

When I create a NEW RECIPE the tags are added in join table (taggings) normally. But when I edit the collection_select helper does not mark as "selected" the item.

如何构造具有多个作用域的collection_select?

如何构造用于edit/update动作的collection_select?

还有另一种更好的方法吗?

推荐答案

它对我有用:

= f.fields_for :taggings, @recipe.taggings.order("id").first do |diet|
    = diet.collection_select :tag_id, Tag.diet, :id, :name

= f.fields_for :taggings, @recipe.taggings.order("id").second do |category| 
    = category.collection_select :tag_id, Tag.category, :id, :name

= f.fields_for :taggings, @recipe.taggings.order("id").third do |festivity| 
    = festivity.collection_select :tag_id, Tag.festivity, :id, :name

= f.fields_for :taggings, @recipe.taggings.order("id").fourth do |daily| 
    = daily.collection_select :tag_id, Tag.daily, :id, :name

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