Question

我使用模型'Aircompany'

来处理belongs_to关联模型'Timetableap'

     class Timetableap < ActiveRecord::Base
        belongs_to :aircompany
      ...
     end


  class Aircompany < ActiveRecord::Base
     has_many :timetableaps
     ...
   end

在'Timetableaps'控制器中：

  class TimetableapsController < ApplicationController
   ...
   def index
     @t = Timetableap.search(params[:search_ap],params[:search_al])
   ...
   end

我的结构表 “航空公司”表

  create_table "aircompanies", :force => true do |t|
     t.string   "iata_code",        :null => false
     t.string   "icao_code",        :null => false
     t.string   "awb_prefix"
     t.string   "airline_name",     :null => false
     t.integer  "airport_id",       :null => false
     t.string   "country"
     t.string   "ap_hubs"
     t.date     "start"
     t.date     "end"
     t.datetime "created_at",       :null => false
     t.datetime "updated_at",       :null => false
   end

“timetableaps”表

  create_table "timetableaps", :force => true do |t|
     t.integer  "Flight_Number"
     t.integer  "aircompany_id"
     t.integer  "way_start"
     t.integer  "way_end"
     t.string   "TermStart"
     t.string   "GateStart"
     t.string   "TermEnd"
     t.string   "GateEnd"
     t.string   "TypeOfPlane"
     t.time     "TimeStart"
     t.time     "TimeEnd"
     t.date     "DateOfStartNav"
     t.date     "DateOfEndNav"
     t.integer  "s1"
     t.integer  "s2"
     t.integer  "s3"
     t.integer  "s4"
     t.integer  "s5"
     t.integer  "s6"
     t.integer  "s0"
     t.integer  "e1"
     t.integer  "e2"
     t.integer  "e3"
     t.integer  "e4"
     t.integer  "e5"
     t.integer  "e6"
     t.integer  "e0"
     t.datetime "created_at",     :null => false
     t.datetime "updated_at",     :null => false
   end

如何使用'aircompany.airline_name'在视图中显示下拉列表？

 <%= select_tag "search_al", options_from_collection_for_select(@t.group("aircompany_id"),"aircompany_id", **"aircompany"**), prompt: "All Airlines" %>

Answer 1

目前尚不清楚您是否希望与所有航空公司联系，或者是否应该以某种方式过滤它们。

如果您想要所有航空公司，这可行：

<%= select_tag "search_al", options_from_collection_for_select(Aircompany.all, :id, :airline_name), prompt: "All Airlines" %>

由于@t似乎是Timetableap条记录的集合，您可以选择仅显示当前时间表集合中的航空公司：

<%= select_tag "search_al", options_from_collection_for_select(@t.map(&:aircompany).uniq, :id, :airline_name), prompt: "All Airlines" %>

使用select_tag rails belongs_to

1 个答案: