如何按列标题对Ruby表进行排序？
我正在使用Ruby on Rails创建一个待办事项列表应用程序，我想知道如何通过我的标题对表格上的信息进行排序？ 就像我希望能够点击“标题” “客户端”或“完成”一样 ，它将它们分类为ASC或DESC。 如果可能的话，也可以让他们恢复原来的顺序。 Ť
这是我正在尝试的代码：
projects_controller.rb：
class ProjectsController < ApplicationController before_action :set_project, only: [:show, :edit, :update, :destroy] helper_method :sort_column, :sort_direction def index @projects = Project.order(sort_column + " " + sort_direction) end private def sort_column Project.column_names.include?(params[:sort]) ? params[:sort] : "title" end def sort_direction %w[asc desc].include?(params[:direction]) ? params[:direction] : "asc" end # GET /projects # GET /projects.json def index @projects = Project.all end # GET /projects/1 # GET /projects/1.json def show end # GET /projects/new def new @project = Project.new end # GET /projects/1/edit def edit end # POST /projects # POST /projects.json def create @project = Project.new(project_params) respond_to do |format| if @project.save format.html { redirect_to @project, notice: 'Project was successfully created.' } format.json { render :show, status: :created, location: @project } else format.html { render :new } format.json { render json: @project.errors, status: :unprocessable_entity } end end end # PATCH/PUT /projects/1 # PATCH/PUT /projects/1.json def update respond_to do |format| if @project.update(project_params) format.html { redirect_to @project, notice: 'Project was successfully updated.' } format.json { render :show, status: :ok, location: @project } else format.html { render :edit } format.json { render json: @project.errors, status: :unprocessable_entity } end end end # DELETE /projects/1 # DELETE /projects/1.json def destroy @project.destroy respond_to do |format| format.html { redirect_to projects_url, notice: 'Project was successfully destroyed.' } format.json { head :no_content } end end private # Use callbacks to share common setup or constraints between actions. def set_project @project = Project.find(params[:id]) end # Never trust parameters from the scary internet, only allow the white list through. def project_params params.require(:project).permit(:title, :description, :hours, :payrate, :done, :client) end end application_helper.rb：
module ApplicationHelper def sortable(column, title = nil) title ||= column.titleize css_class = column == sort_column ? "current #{sort_direction}" : nil direction = column == sort_column && sort_direction == "asc" ? "desc" : "asc" link_to title, {:sort => column, :direction => direction}, {:class => css_class} end end
index.html.erb：
Project List
Description Hours
有一个非常好的教程：
http://railscasts.com/episodes/228-sortable-table-columns
您应首先尝试本教程，如果您仍有疑问，请再次询问……
我希望它有所帮助。
简单的方法是使用jQuery插件： DataTables 。