我正在尝试在轨道上创建ruby中的excel表.所以我使用了插件Rexcel.当我运行应用程序时,我收到以下错误.
未初始化的常量Rexcel :: Workbook :: Builder
我添加了以下代码,然后这个错误命中
workbook = Rexcel::Workbook.new
worksheet = workbook.add_worksheet("Customers")
worksheet.add_line("name","test")
headers['Content-Type'] = "application/vnd.ms-excel"
headers['Content-Disposition'] = 'attachment; filename="excel-export.xlsx"'
headers['Cache-Control'] = 'max-age=0'
headers['pragma']="public"
workbook.build
怎么解决这个？
rubygems ruby-on-rails ruby-on-rails-plugins ruby-on-rails-3
我有以下查询正常工作
ObjectItem.find(:all, :include => :object_groups, :conditions => "object_items.description LIKE '%#{search}%' OR object_groups.description LIKE '%#{search}%'", :order => 'object_items.created_at DESC')
但是以这种方式进行查询现在已被弃用,因此我正在尝试更改为此表单
ObjectItem.order('object_items.created_at DESC').includes(:object_groups).where("object_items.description LIKE '%#{search}%' OR object_groups.description LIKE '%#{search}%'")
但是我收到以下错误:
Mysql2::Error: Column created_at in order clause is ambiguous: SELECT DISTINCT `object_items`.id FROM `object_items` LEFT OUTER JOIN `object_groups_object_items` ON `object_groups_object_items`.`object_item_id` = `object_items`.`id` LEFT OUTER JOIN `object_groups` ON `object_groups`.`id` = `object_groups_object_items`.`object_group_id` WHERE (object_items.description LIKE '%%' OR object_groups.description LIKE '%%') ORDER BY object_items.created_at DESC, created_at DESC LIMIT 20 OFFSET 0
我有一个使用ActiveAdmin 1.0的Rails 3.2应用程序,我在这里使用active_admin_editor gem.
任何时候我尝试加载我得到下面的错误.前端加载正常,如果我删除active_admin_editor gem,ActiveAdmin加载正常.
我在谷歌和搜索引擎优化中搜索了几天,试图找出答案.
在/Library/Ruby/Gems/2.0.0/gems/active_admin_editor-1.1.0/app/assets/stylesheets/active_admin/editor.css.scss未定义混入 '的box-shadow'
Application.css.scss
*= require_self
*= require formtastic-bootstrap
*= require my_styles
*= require active_admin/editor/wysiwyg
我的应用布局.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="">
<meta name="author" content="">
<link rel="shortcut icon" href="../../assets/ico/favicon.ico">
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<!--Latest minified Font Awesome CSS-->
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css">
<!-- Custom styles for this template -->
<link href="/assets/my_styles-6077c0d3b7523ad80195404b9270b1ac.css" media="screen" rel="stylesheet" type="text/css" …我有一个带有devise_token_auth gem身份验证的Rails 5 API .
现在我想要经过身份验证的用户进行个人聊天 我没有资产,因为我正在使用API,而前端是在本机应用程序中,我希望本机应用程序消息传递.
所以我如何使用devise_token_auth gem验证用户使用动作电缆进行个人消息传递
authentication ruby-on-rails devise ruby-on-rails-5 actioncable
我正在使用Rails 5.0.0.1。下面的代码段是模型，
class Note < ApplicationRecord
belongs_to :language
end
class Language < ApplicationRecord
has_many :notes
end
当我尝试在Rails控制台中创建笔记时，
Note.create!(content: '1234')
它将产生以下错误，
ActiveRecord::RecordInvalid: Validation failed: Language must exist