Rails嵌套关联和多个collection_select

我是相当新的轨道和使用多选时，我有一些问题更新我的关联表。Rails嵌套关联和多个collection_select

我有三个表，portraitportrait_tags和tags

（该标签存储我的标签名称（传统，鼓舞人心，社区等）的名称）

我想要的结果是，“多选场'会根据Tag.all tag_id值将标签添加到portrait_tag表中。目前，这似乎只插入一个字段，并且portrait_tag表中的tag_id为NULL，然后当我返回到编辑页面时，多重选择被复制。

PARAMS

Parameters: {"utf8"=>"✓", "authenticity_token"=>"j+Obhq9u+mvOKYnj4+TAGy+be8s3AbZlMvuyKiot5iyKqjMyFAcs23PjbQjOTjwl6aRBx1M5lmYRZzTjOeDTJA==", "portrait"=>{"portrait_tags_attributes"=>{"0"=>{"tag_id"=>["", "1", "2"]}}}, "commit"=>"Save changes", "id"=>"72"}

Tag.rb

class Tag < ActiveRecord::Base 

    has_many :portraits, through: :portrait_tags 
    accepts_nested_attributes_for :portraits 

end

Portrait.rb

class Portrait < ActiveRecord::Base 

    has_many :portrait_tags 
    has_many :tags, through: :portrait_tags 

    accepts_nested_attributes_for :portrait_tags 

end

Portrait_tag.rb

class PortraitTag < ActiveRecord::Base 

    belongs_to :portrait 
    belongs_to :tag 

end

Edit.html.haml

%h1 Edit Portrait 
= form_for [:admin, @portraits], :html => { :method => :put } do |f| 

    - if flash[:system].present? 
    - flash[:system].each do |e| 
     %div= e 

    - if flash[:notice].present? 
    %div= flash[:notice] 

    = f.fields_for :portrait_tags do |a| 
    = a.collection_select :tag_id, Tag.all, :id, :name, {}, {multiple: true} 

    = f.submit "Save changes", class: "btn btn-primary"

PortraitController

class Admin::PortraitsController < ApplicationController 

    def edit 
     @portraits = Portrait.where(artist_id: 33, id: params[:id]).take 
     @portraits.portrait_tags.build 

    end 

    def update 

     @portrait = Portrait.where(artist_id: 33, id: params[:id]).take 


     if @portrait.update(portrait_params) 

     p portrait_params 

     else 
     flash[:system] = @portrait.errors.full_messages 
     p @portrait.errors.full_messages 

     render :edit 
     end 

    end 

    private 
     def portrait_params 
     # Permit our attributes 
     params.require(:portrait).permit(:id, portrait_tags_attributes: [:id, :tag_id => [] ]) 

     end 



end

portrait_tags表

个

+----+-------------+--------+ 
| id | portrait_id | tag_id | 
+----+-------------+--------+

画像表

+----+-----------+--------------+ 
| id | artist_id | artist_image | 
+----+-----------+--------------+

标签表

+----+-----------+--------------------+ 
| id | name | portrait_tag_id | 
+----+-----------+--------------------+

来源

2016-12-07 Adam

<%= collection_select(:portrait_tag, :tag_ids, 
       Tag.all(:order=>"name ASC"), 
       :id, :name, {:selected => @portraits.tag_ids, :include_blank => true}, {:multiple => true}) %>

希望这会为你工作。

来源

2016-12-07 12:20:09

谢谢，这工作。你能解释一下为什么？我正在努力解决这个问题！ – Adam

在这种情况下，使用fields_for是错误。 –

Thanks Atul，如果我在form_for中有另外一个字段，我该如何将param传递给多个？ params.require（：portrait）.permit（：id，：artist_image） params.require（：portrait_tag）.permit（：id，：tag_ids => []） – Adam

Rails嵌套关联和多个collection_select

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