ruby-on-rails – (如何)我可以使用表单对象进行编辑更新例程吗？

概述忍不住尝试重新启动 RailsForum并转发这个问题 here. 我有以下表单对象(在Rails 4中) class StationForm include Virtus include ActiveModel::Model # I think this is unnecessary # extend ActiveModel::Naming # 忍不住尝试重新启动 RailsForum并转发这个问题 here.

我有以下表单对象(在Rails 4中)

class StationForm    include Virtus    include ActiveModel::Model    # I think this is unnecessary    #   extend ActiveModel::Naming    #   include ActiveModel::Conversion    #   include ActiveModel::ValIDations# Station    attr_reader :station    attribute :station_name,String    attribute :station_description,String# Address    attr_reader :address    attribute :address_url,String    attribute :address_priority,Integer    attribute :address_is_active,Boolean    def persisted?        false    end    def save        if valID?            persist            true        else            false        end    endprivate    def persist        @station = Station.create(name: station_name,description: station_description)        @address = @station.addresses.create(url: address_url,priority: address_priority,is_active: address_is_active)    endend

我可以在new / create方法中使用这个表单对象

class StationsController < ApplicationController    def new        @station_form = StationForm.new    end    def create        @station_form = StationForm.new(station_form_params)        @station_form.save        redirect_to station_path(@station)    endprivate    def station_form_params        params.require(:station_form).permit(:station_name,:station_description,:address_url,:address_priority,:address_is_active)    endend

但是,我没有成功将它用于编辑/更新程序……

是否可以使用表单对象进行编辑/更新,如果是,将如何完成？

解决方法 您必须使用StationForm对象中的“initialize”方法将其用于编辑.如果你传递一个ID,它将假设该对象已经存在,并从那里我们可以将它视为一个持久化对象.
还添加“update”方法来更新对象的属性.

class StationForminclude Virtus.modelinclude ActiveModel::Model# I think this is unnecessary#   extend ActiveModel::Naming#   include ActiveModel::Conversion#   include ActiveModel::ValIDationsattr_reader :stationattribute :station_name,Stringattribute :station_description,Stringattr_reader :addressattribute :address_url,Stringattribute :address_priority,Integerattribute :address_is_active,Booleandef initialize(attr = {}) if !attr["ID"].nil?    @station = Station.find(attr["ID"])    @address = @station.addresses.first    self[:station_name] = attr[:station_name].nil? ? @station.name : attr[:station_name]    self[:station_description] = attr[:station_description].nil? ? @station.description : attr[:station_description]    self[:address_url] =  attr[:address_url].nil? ? @address.url : attr[:address_url]    self[:address_priority] = attr[:address_priority].nil? ? @address.priority : attr[:address_priority]    self[:address_is_active] = attr[:address_is_active].nil? ? @address.is_active : attr[:address_is_active] else   super(attr) endenddef persisted?    @station.nil? ? false : @station.persisted?enddef ID   @station.nil? ? nil : @station.IDenddef save    if valID?        persist        true    else        false    endenddef update    if valID?        update_form        true    else        false    endendprivate def persist    @station = Station.create(name: station_name,description: station_description)    @address = @station.addresses.create(url: address_url,is_active: address_is_active) end def update_form    @station.update_attributes(        :name => self[:station_name],:description => self[:station_description]        )    @address.update_attributes(        :url => self[:address_url],:priority => self[:address_priority],:is_active=> self[:address_is_active]        ) endend

和控制器会像

def new @station = StationForm.newenddef edit @station = StationForm.new("ID" => params[:ID])enddef create  @station = StationForm.new(station_params) respond_to do |format|   if @station.save     format.HTML { redirect_to  stations_path,notice: 'Station was  successfully created.' }     format.Json { render :show,status: :created,location: @station }   else     format.HTML { render :new }     format.Json { render Json: @station.errors,status: :unprocessable_entity  }    end endenddef update @station = StationForm.new(station_params.merge("ID" => params[:ID])) respond_to do |format|   if @station.update     format.HTML { redirect_to stations_path,notice: 'Station was  successfully updated.' }     format.Json { render :show,status: :ok,location: @station }   else     format.HTML { render :edit }     format.Json { render Json: @station.errors,status: :unprocessable_entity  }   end endend

使用_form.HTML.erb中StationForm的“persisted”和“ID”方法

<%= form_for(@station,:url => @station.persisted? ? station_path(@station.ID) : stations_path,:method => @station.persisted? ? "put": "post") do |f| %>  <% if @station.errors.any? %>    <div ID="error_explanation">      <h2><%= pluralize(@station.errors.count,"error") %> prohibited this station from being saved:</h2>      <ul>      <% @station.errors.full_messages.each do |message| %>        <li><%= message %></li>      <% end %>      </ul>    </div>  <% end %>  <div >    <%= f.label :station_name %><br>    <%= f.text_fIEld :station_name %>  </div>  <div >    <%= f.label :station_description %><br>    <%= f.text_fIEld :station_description %>  </div>  <div >    <%= f.label :address_url%><br>    <%= f.text_fIEld :address_url %>  </div>  <div >    <%= f.label :address_priority%><br>    <%= f.text_fIEld :address_priority%>  </div>  <div >    <%= f.label :address_is_active %><br>    <%= f.text_fIEld :address_is_active %>  </div>  <div >    <%= f.submit %>  </div><% end %>

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