pcjjdy

迁移数据库时的 wrong number of arguments (4 for 2..3) 问题

pcjjdy — Thu, 04 Dec 2014 19:03:20 +0800

想创建一个注册页面，注册需要的信息是 studentsid name email。bundle exec rake db:migrate 是发生问题

C:\Users\pcjjdy\Desktop\final project>bundle exec rake db:migrate
==  AddIndexToUsersEmail: migrating ===========================================
-- add_index(:studentsid, :users, :email, {:unique=>true})
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

wrong number of arguments (4 for 2..3)C:/Users/pcjjdy/Desktop/final project/db/m
igrate/20141022140717_add_index_to_users_email.rb:3:in `change'
C:in `migrate'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

db\migrate\20141022140717_add_index_to_users_email 代码如下

class AddIndexToUsersEmail < ActiveRecord::Migration
  def change
    add_index :studentsid, :users, :email, unique: true
  end
end

db\migrate\20141130233939_create_users.rb 代码如下

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :studentsid
      t.string :name
      t.string :email

      t.timestamps
    end
  end
end

app\controllers\users_controller.rb 代码如下

class UsersController < ApplicationController
     def show
       @user = User.find(params[:id])
       @microposts = @user.microposts
     end

     def new
       @user = User.new
     end

      def create
       secure_params = params.require(:user).permit(:studentsid, :name, :email, 
        :password, :password_confirmation)
       @user = User.new(secure_params)
       if @user.save
          sign_in @user
          flash[:success] = "Thank you for your registing!"
          redirect_to @user
       else
          render 'new'
       end
     end
end

在 CMD 中运行 rails console 出现 Nameerror uninitialized constant 错误

pcjjdy — Mon, 20 Oct 2014 01:23:38 +0800

我执行了重置数据库的命令后，试图创建新的用户 name: "Example User 1", email: "example-1@railstutorial.org"，出现以下错误


C:\Users\pcjjdy\Desktop\ruby\lab6\mytwitter>rails console
DL is deprecated, please use Fiddle
Loading development environment (Rails 4.0.0)
irb(main):002:0>User.create(name: "Example User 1", email: "example-1@railstutorial.org",password: "secret", password_confirmation: "secret")
NameError: uninitialized constant User
        from (irb):1
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands/console.rb:90:in `start'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands/console.rb:9:in `start'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:64:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'
<rial.org",password: "secret",password_confirmation: "secret")

网上有人说是 gemfire 问题，也有人说是 application.rb 的问题。我尝试过但都无效。求指教

为何安装了 Node.js 仍然出现 JavaScript runtime 错误

pcjjdy — Tue, 14 Oct 2014 00:00:03 +0800

今天在配置网站的 user 和 email 时发生了好久不见的 JavaScript runtime 错误，以前我安装了 node.js 后不再出现，没想到现在又出现了。求教

C:\Users\pcjjdy\Desktop\ruby\lab5\mytwitter>rails generate model User name:strin
g email:string
DL is deprecated, please use Fiddle
C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/execjs-2.2.1/lib/execjs/run
times.rb:51:in `autodetect': Could not find a JavaScript runtime. See https://gi
thub.com/sstephenson/execjs for a list of available runtimes. (ExecJS::RuntimeUn
available)
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/execjs-2.2.1/l
ib/execjs.rb:5:in `<module:ExecJS>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/execjs-2.2.1/l
ib/execjs.rb:4:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/uglifier-2.5.3
/lib/uglifier.rb:3:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/uglifier-2.5.3
/lib/uglifier.rb:3:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:72:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:72:in `block (2 levels) in require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:70:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:70:in `block in require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:59:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:59:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler.rb:132:in `require'
        from C:/Users/pcjjdy/Desktop/ruby/lab5/mytwitter/config/application.rb:7
:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:44:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:44:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

rails server 时的 LoadError 错误

pcjjdy — Sat, 04 Oct 2014 22:13:38 +0800

显示 sqlite3.rb 文件下的 sqlite3/sqlite3_native有问题，但是不知道如何解决？

   C:\Users\pcjjdy\Desktop\text\rails_projects\first_app>rails server
C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7-x86-mingw32/l
ib/sqlite3.rb:6:in `require': cannot load such file -- sqlite3/sqlite3_native (L
oadError)
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7-
x86-mingw32/lib/sqlite3.rb:6:in `rescue in <top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/sqlite3-1.3.7-
x86-mingw32/lib/sqlite3.rb:2:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:72:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:72:in `block (2 levels) in require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:70:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:70:in `block in require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:59:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler/runtime.rb:59:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/bundler-1.3.5/
lib/bundler.rb:132:in `require'
        from C:/Users/pcjjdy/Desktop/text/rails_projects/first_app/config/applic
ation.rb:7:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:76:in `require'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:76:in `block in <top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:73:in `tap'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:73:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

关于 rails server 时的 Syntaxerror 问题

pcjjdy — Wed, 01 Oct 2014 18:58:11 +0800

当我在我的目标文件夹里启动 rails server 时，开始疯狂报错。google 上也有人遇到这个问题，但暂时找不到解决办法。。求助啊


D:\lab4\mytwitter>rails server
=> Booting WEBrick
=> Rails 4.0.0 application starting in development on http://0.0.0.0:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
Exiting
C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-4.0.0/lib/act
ive_support/dependencies.rb:222:in `load': D:/lab4/mytwitter/config/routes.rb:59
: syntax error, unexpected keyword_end, expecting end-of-input (SyntaxError)
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:222:in `block in load'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:213:in `load_dependency'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/dependencies.rb:222:in `load'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/routes_reloader.rb:40:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/routes_reloader.rb:40:in `load_paths'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/routes_reloader.rb:16:in `reload!'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/routes_reloader.rb:26:in `block in updater'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/file_update_checker.rb:75:in `call'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/activesupport-
4.0.0/lib/active_support/file_update_checker.rb:75:in `execute'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/routes_reloader.rb:27:in `updater'
        from C:131071:in `execute_if_updated'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/initializable.rb:30:in `instance_exec'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/initializable.rb:30:in `run'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/initializable.rb:55:in `block in run_initializers'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:150:in `block i
n tsort_each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:183:in `block (
2 levels) in each_strongly_connected_component'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:219:in `each_st
rongly_connected_component_from'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:182:in `block i
n each_strongly_connected_component'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:180:in `each'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:180:in `each_st
rongly_connected_component'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/2.0.0/tsort.rb:148:in `tsort_e
ach'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/initializable.rb:54:in `run_initializers'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/application.rb:215:in `initialize!'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/railtie/configurable.rb:30:in `method_missing'
        from D:/lab4/mytwitter/config/environment.rb:5:in `<top (required)>'
        from D:/lab4/mytwitter/config.ru:3:in `require'
        from D:/lab4/mytwitter/config.ru:3:in `block in <main>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/builder.rb:55:in `instance_eval'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/builder.rb:55:in `initialize'
        from D:/lab4/mytwitter/config.ru:in `new'
        from D:/lab4/mytwitter/config.ru:in `<main>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/builder.rb:49:in `eval'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/builder.rb:49:in `new_from_string'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/builder.rb:40:in `parse_file'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/server.rb:277:in `build_app_and_options_from_config'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/server.rb:199:in `app'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands/server.rb:48:in `app'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/rack-1.5.2/lib
/rack/server.rb:314:in `wrapped_app'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands/server.rb:75:in `start'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:78:in `block in <top (required)>'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:73:in `tap'
        from C:/RailsInstaller/Ruby2.0.0/lib/ruby/gems/2.0.0/gems/railties-4.0.0
/lib/rails/commands.rb:73:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'