将关联添加到 HaBtM 关系的连接表

Question

我目前有 3 个模型（用户、配对、会议）和连接表meetings_pairings。

用户.rb

class User < ActiveRecord::Base
  enum role: [:student, :supervisor, :admin]
  has_many :students, class_name: "User",
                      foreign_key: "supervisor_id"
  belongs_to :supervisor, class_name: "User"
  has_and_belongs_to_many :pairings
end

配对.rb

class Pairing < ActiveRecord::Base
  has_and_belongs_to_many :supervisor, class_name: 'User'
  belongs_to :student, class_name: 'User'
  has_and_belongs_to_many :meetings, join_table: :meetings_pairings
end

会议.rb

class Meeting < ActiveRecord::Base
    enum status: [:available, :unavailable]
    has_and_belongs_to_many :pairings, join_table: :meetings_pairings
end

Schema.rb （相關位）

  create_table "meetings", force: :cascade do |t|
    t.date     "meeting_date"
    t.datetime "meeting_time"
    t.integer  "status",       default: 0, null: false
    t.boolean  "accepted"
  end
  create_table "meetings_pairings", id: false, force: :cascade do |t|
    t.integer "pairing_id"
    t.integer "meeting_id"
  end
  add_index "meetings_pairings", ["meeting_id"], name: "index_meetings_pairings_on_meeting_id"
  add_index "meetings_pairings", ["pairing_id"], name: "index_meetings_pairings_on_pairing_id"
  create_table "pairings", force: :cascade do |t|
    t.integer  "supervisor_id"
    t.integer  "student_id"
    t.string   "project_title"
  end
  add_index "pairings", ["student_id"], name: "index_pairings_on_student_id", unique: true
  add_index "pairings", ["supervisor_id"], name: "index_pairings_on_supervisor_id"

我创建了视图和控制器，以使用户（主管，在配对中）能够创建会议。但是我不知道如何将此关联添加到连接表中。

meetings_controller.rb

class MeetingsController < ApplicationController
    def index
        @meetings = Meeting.all
    end
    def new
        @meeting = Meeting.new
    end
    def create
        @meeting = Meeting.new(meeting_params)
        if @meeting.save
      redirect_to meetings_path, :notice => "Meeting Created!"
    else 
      redirect_to meetings_path, :notice => "Meeting Failed!"
    end
  end
  def show
    @meeting = Meeting.find(params[:id])
  end  
  private
  def meeting_params
    params.require(:meeting).permit(:meeting_date, :meeting_time)
  end
end

从视图窗体

<%= form_for @meeting do |f| %>
  <div class="field">
    <%= f.label :meeting_date %><br />
    <%= f.text_field :meeting_date %>
  </div>
  <div class="field">
    <%= f.label :meeting_time %><br />
    <%= f.time_select :meeting_time, :ampm => true, :minute_step => 30, :default => {:hour => '9', :minute => '0'} %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

这会在会议表中创建一个条目，

所以我的问题是我怎样才能在加入表中创建一个条目，其中包含创建会议的当前用户的配对 ID？

Answer 1

决定改用has_many ：through（用户-会议-用户）关系。问题不再相关。