根据rails 4，bootstrap 3中的类别ID更改下拉菜单的文本

Question

我创建了一个作业类别下拉菜单，基于菜单中的选择，文本必须更改。在此应用程序中使用Bootstrap 3，创建了一个jobcategory模型并将其id分配给jobs.Is有一种方法可以改变使用时的下拉菜单文本- Jobcategory.all.each do |jobcategory| %li= link_to jobcategory.name, - Jobcategory.all.each do |jobcategory| %li= link_to jobcategory.name,

 class Jobcategory < ActiveRecord::Base has_many :jobs end class Job < ActiveRecord::Base belongs_to :jobcategory validates :jobcategory, presence: true end class JobsController < ApplicationController before_action :find_job, only: [:show, :edit, :update, :destroy] before_action :authenticate_user!,except:[:index] def index if params[:jobcategory].blank? @jobs = Job.all.order("created_at DESC") else @jobcategory_id = Jobcategory.find_by(name: params[:jobcategory]).id @jobs =Job.where(jobcategory_id: @jobcategory_id).order("created_at DESC") end end ActiveRecord::Schema.define(version: 20150512104628) do # These are extensions that must be enabled in order to support this database enable_extension "plpgsql" create_table "jobcategories", force: true do |t| t.string "name" t.datetime "created_at" t.datetime "updated_at" end create_table "jobs", force: true do |t| t.string "title" t.datetime "created_at" t.datetime "updated_at" t.integer "jobcategory_id" t.integer "user_id" t.boolean "active" end index.html.haml %hearder %nav.navbar.navbar-job .container{class: "text-center"} %div{class: "btn-group"} %ul.dropdown %a.btn.dropdown-toggle.btn-job{"data-toggle" => "dropdown","role" => "button"} %span{class: "caret"} %ul.dropdown-menu %li= link_to "All Jobs", jobs_path - Jobcategory.all.each do |jobcategory| %li= link_to jobcategory.name, jobs_path(jobcategory: jobcategory.name) 

Answer 1

是的，当然可以。

您的参数中已有作业类别名称：

%ul.dropdown
  %a.btn.dropdown-toggle.btn-job{ data: { toggle: 'dropdown' }, role: 'button' }
    = params[:jobcategory] || 'Choose category' # in case it is `nil`
    %span.caret