oracle_enhanced适配器上的has_and_belongs_to_many

Question

我不知道这是否是oracle_enhanced适配器的问题.我有:

class Room < ActiveRecord::Base
  has_and_belongs_to_many :manuals
end

class Manual < ActiveRecord::Base
  has_and_belongs_to_many :rooms
end

class CreateJoinTableManualRoom < ActiveRecord::Migration
  def change
    create_join_table :manuals, :rooms do |t|
      t.index [:manual_id, :room_id]
      t.index [:room_id, :manual_id]
    end
  end
end

当我创建新手册时,它不会更新我的manuals_rooms连接表.

class ManualsController < ApplicationController
  before_action :set_manual, only: [:show, :edit, :update, :destroy]

  def index
    @manuals = Manual.all
    @rooms = Room.all
  end

  def show
  end

  def new
    @manual = Manual.new
  end

  def edit
  end

  def create
    @manual = Manual.new(manual_params)

    respond_to do |format|
      if @manual.save
        format.html { redirect_to @manual, notice: 'Manual was successfully created.' }
        format.json { render action: 'show', status: :created, location: @manual }
      else
        format.html { render action: 'new' }
        format.json { render json: @manual.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @manual.update(manual_params)
        format.html { redirect_to @manual, notice: 'Manual was successfully updated.' }
        format.json { head :no_content }
      else
        format.html { render action: 'edit' }
        format.json { render json: @manual.errors, status: :unprocessable_entity }
      end
    end
  end

  private
    def set_manual
      @manual = Manual.find(params[:id])
    end

    def manual_params
      params.require(:manual).permit(:name, :document, :room_ids => [])
    end
end

日志

Started POST "/manuals" for 127.0.0.1 at 2014-08-20 09:12:12 -0400
Processing by ManualsController#create as HTML
  Parameters: {"utf8"=>"?", "authenticity_token"=>"Ntqqh1vU9zrGZuw3K8xNef440ktAixWj+6Cx20wrCRg=", "manual"=>{"document"=>#<ActionDispatch::Http::UploadedFile:0x000001134643d0 @tempfile=#<Tempfile:/var/folders/d1/x0nbfyrj30bd_p33ds0f12_c0000gq/T/RackMultipart20140820-59361-1jkeynu>, @original_filename="103.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"manual[document]\"; filename=\"103.jpg\"\r\nContent-Type: image/jpeg\r\n">, "room_id"=>"3"}, "commit"=>"Upload"}
Unpermitted parameters: room_id
  SQL (1.8ms)  INSERT INTO "MANUALS" ("CREATED_AT", "DOCUMENT", "ID", "UPDATED_AT") VALUES (:a1, :a2, :a3, :a4)  [["created_at", Wed, 20 Aug 2014 09:12:12 EDT -04:00], ["document", "103.jpg"], ["id", 10021], ["updated_at", Wed, 20 Aug 2014 09:12:12 EDT -04:00]]
Redirected to http://localhost:3000/manuals/10021
Completed 302 Found in 16ms (ActiveRecord: 1.8ms)

我改变room_ids => []了room_id,现在我得到:

  SQL (2.5ms)  INSERT INTO "MANUALS" ("CREATED_AT", "DOCUMENT", "ID", "ROOM_ID", "UPDATED_AT") VALUES (:a1, :a2, :a3, :a4, :a5)  [["created_at", Wed, 20 Aug 2014 09:20:43 EDT -04:00], ["document", "AMH_BW.jpg"], ["id", 10022], ["room_id", 3], ["updated_at", Wed, 20 Aug 2014 09:20:43 EDT -04:00]]
Redirected to http://localhost:3000/manuals/10022
Completed 302 Found in 56ms (ActiveRecord: 19.0ms)

手册/ _form.html.erb

<%= form_for(@manual) do |f| %>
  <div class="field">
    <%= f.label :document %><br>
    <%= f.file_field :document %>
  </div>
  <div class="field">
    <%#= collection_select(:manual, :room_ids, Room.all, :id, :name) %>
    <%= f.grouped_collection_select :room_id, Building.order(:name), :rooms, :name, :id, :name_with_number, include_blank: true %>                            
  </div>
  <div class="actions">
    <%= f.submit "Upload" %>
  </div>
<% end %>

Answer 1

我在这看到几个问题.让我一个一个地突出它们:

1.缺少multiple: true选项

Room并且Manual有一个HABTM关联,即MM关系.

作为@MaxWilliams在他的回答中指出,Rails的期望的数组room_ids中params的哈希,而不是一个单一的值.

要做到这一点,你应该允许用户选择多个rooms形式(请记住,它的MM关系加入)multiple: true作为一个html选项,grouped_collection_select在你的方法form.而且,第一个论点应该是room_ids代替room_id.

<%= f.grouped_collection_select :room_ids, Building.order(:name), :rooms, :name, :id, :name_with_number, {include_blank: true}, {multiple: true} %>  

2.允许room_ids作为数组

由于上面的变更#1,room_ids现在将作为params散列中的数组传递,因此应该允许它作为.Array

def manual_params
  params.require(:manual).permit(:name, :document, :room_ids => [])
end

3.删除room_id从manuals表

根据问题中的共享日志

SQL (2.5ms)  INSERT INTO "MANUALS" ("CREATED_AT", "DOCUMENT", "ID", "ROOM_ID", "UPDATED_AT") VALUES (:a1, :a2, :a3, :a4, :a5)  [["created_at", Wed, 20 Aug 2014 09:20:43 EDT -04:00], ["document", "AMH_BW.jpg"], ["id", 10022], ["room_id", 3], ["updated_at", Wed, 20 Aug 2014 09:20:43 EDT -04:00]]

我看到你已经添加了room_id字段到manuals表.现在这是一个不!没有!

你没有1-M协会或1-1协会之间Manual和Room,但有一个MM公会它们之间有一个连接表manuals_rooms已经包含room_id和manual_id领域.

底线是您需要从表中删除 .room_idmanuals

生成迁移以进行删​​除room_id:

rails generate migration RemoveRoomIdFromManuals room_id:integer

运行rake db:migrate以迁移更改.

这应该照顾你的问题.让我知道.

我真的开始认为这可能是一个神谕

没有!这没有什么不对oracle_enhanced adapter.这是导致问题的代码.