<p><%= link_to "汇出 CSV", admin_event_registrations_path(:format => :csv)  %></p>

app/controllers/admin/event_registrations_controller.rb

+  require 'csv'class Admin::EventRegistrationsController < AdminControllerdef index# (略)+      respond_to do |format|
+        format.html
+        format.csv {
+          @registrations = @registrations.reorder("id ASC")
+          csv_string = CSV.generate do |csv|
+            csv << ["报名ID", "票种", "姓名", "状态", "Email", "报名时间"]
+            @registrations.each do |r|
+              csv << [r.id, r.ticket.name, r.name, t(r.status, :scope => "registration.status"), r.email, r.created_at]
+            end
+          end
+          send_data csv_string, :filename => "#{@event.friendly_id}-registrations-#{Time.now.to_s(:number)}.csv"
+        }
+      endend

如果上述 Excel 打开 CSV 档案的解法没办法接受的话，那只好想办法汇出 Excel 专用的 xlsx 格式了。这需要额外装 gem。

使用 axlsx_rails gem(470✨)。

⚠️ Rails 4.2, 5.0 or 5.1 (tested), 还不支持5.2

wb = xlsx_package.workbook
wb.add_worksheet(name: "Buttons") do |sheet| sheet.add_row ["报名ID", "票种", "姓名", "状态", "Email", "报名时间"] @registrations.each do |r| sheet.add_row [r.id, r.ticket.name, r.name, t(r.status, :scope => "registration.status"), r.email, r.created_at] end end

+ require 'csv'namespace :dev do+   task :import_registration_csv_file => :environment do
+     event = Event.find_by_friendly_id("fullstack-meetup")
+     tickets = event.tickets
+
+     success = 0
+     failed_records = []
+
+     CSV.foreach("#{Rails.root}/tmp/registrations.csv") do |row|
+       registration = event.registrations.new( :status => "confirmed",
+                                    :ticket => tickets.find{ |t| t.name == row[0] },
+                                    :name => row[1],
+                                    :email => row[2],
+                                    :cellphone => row[3],
+                                    :website => row[4],
+                                    :bio => row[5],
+                                    :created_at => Time.parse(row[6]) )
+
+       if registration.save
+         success += 1
+       else
+         failed_records << [row, registration]
+       end
+     end
+
+     puts "总共汇入 #{success} 笔，失败 #{failed_records.size} 笔"
+
+     failed_records.each do |record|
+       puts "#{record[0]} ---> #{record[1].errors.full_messages}"
+     end
+
+   end

  class CreateRegistrationImports < ActiveRecord::Migration[5.0]def changecreate_table :registration_imports do |t|
+       t.string :status
+       t.string :csv_file
+       t.integer :event_id, :index => true
+       t.integer :user_id
+       t.integer :total_count
+       t.integer :success_count
+       t.text :error_messagest.timestampsendendend

+ require 'csv'class RegistrationImport < ApplicationRecord+   mount_uploader :csv_file, RegistrationImportCsvUploader
+
+   validates_presence_of :csv_file
+
+   belongs_to :event
+   belongs_to :user
+
+   serialize :error_messages, JSON
+
+   def process!
+     csv_string = self.csv_file.read.force_encoding('utf-8')
+     tickets = self.event.tickets
+
+     success = 0
+     failed_records = []
+
+     CSV.parse(csv_string) do |row|
+       registration = self.event.registrations.new( :status => "confirmed",
+                                    :ticket => tickets.find{ |t| t.name == row[0] },
+                                    :name => row[1],
+                                    :email => row[2],
+                                    :cellphone => row[3],
+                                    :website => row[4],
+                                    :bio => row[5],
+                                    :created_at => Time.parse(row[6]) )
+
+       if registration.save
+         success += 1
+       else
+         failed_records << [row, registration.errors.full_messages]
+       end
+     end
+
+     self.status = "imported"
+     self.success_count = success
+     self.total_count = success + failed_records.size
+     self.error_messages = failed_records
+
+     self.save!
+   end  end

   has_many :registrations, :dependent => :destroy
+  has_many :registration_imports, :dependent => :destroy

  namespace :admin do# (略)resources :events do
+      resources :registration_imports

  <p class="text-right"><%= link_to "New Registration", new_admin_event_registration_path(@event), :class => "btn btn-primary" %>
+   <%= link_to "Import Registration", admin_event_registration_imports_path(@event), :class => "btn btn-primary" %></p>

- class Admin::RegistrationImportsController < ApplicationController
+ class Admin::RegistrationImportsController < AdminController+   before_action :require_editor!
+   before_action :find_event
+
+   def index
+     @imports = @event.registration_imports.order("id DESC")
+   end
+
+   def create
+     @import = @event.registration_imports.new(registration_import_params)
+     @import.status = "pending"
+     @import.user = current_user
+
+     if @import.save
+       @import.process!
+       flash[:notice] = "汇入完成"
+     end
+
+     redirect_to admin_event_registration_imports_path(@event)
+   end
+
+   protected
+
+   def find_event
+     @event = Event.find_by_friendly_id!(params[:event_id])
+   end
+
+   def registration_import_params
+     params.require(:registration_import).permit(:csv_file)
+   endend

<h1><%= @event.name %> / Registrations Import</h1> <%= form_for [:admin, @event, RegistrationImport.new] do |f| %> <div class="form-group"> <%= f.label :csv_file %> <%= f.file_field :csv_file, :required => true, :class => "form-control" %> </div> <div class="form-group"> <%= f.submit "送出", :class => "btn btn-primary" %> </div> <% end %> <table class="table"> <tr> <th>ID</th> <th>状态</th> <th>CSV档案</th> <th>总笔数</th> <th>汇入成功笔数</th> <th>错误讯息</th> </tr> <% @imports.each do |import| %> <tr> <td><%= import.id %></td> <td><%= import.status %></td> <td><%= link_to import.csv_file.url, import.csv_file.url %></td> <td><%= import.total_count %></td> <td><%= import.success_count %></td> <td> <ul> <% Array(import.error_messages).each do |e| %> <li><%= e[0] %> ----> <strong><%= e[1] %></strong></li> <% end %> </ul> </td> </tr> <% end %> </table>