736248591 (雪靡)

Rails ActiveRecord::PendingMigrationError 错误

736248591 — Sun, 06 Sep 2015 08:45:44 +0800

当我输入 rails s 访问 http://localhost:3000/ 时出错误

ActiveRecord::PendingMigrationError 
Migrations are pending. To resolve this issue, run: bin/rake db:migrate RAILS_ENV=development 
Rails.root: C:/Users/zmk pc/blog
Application Trace | Framework Trace | Full Trace 
activerecord (4.2.3) lib/active_record/migration.rb:392:in `check_pending!'
activerecord (4.2.3) lib/active_record/migration.rb:373:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.3) lib/active_support/callbacks.rb:84:in `run_callbacks'
actionpack (4.2.3) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
web-console (2.2.1) lib/web_console/middleware.rb:39:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.3) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.3) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.3) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.3) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.3) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.3) lib/rails/rack/logger.rb:20:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.6.4) lib/rack/methodoverride.rb:22:in `call'
rack (1.6.4) lib/rack/runtime.rb:18:in `call'
activesupport (4.2.3) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
actionpack (4.2.3) lib/action_dispatch/middleware/static.rb:116:in `call'
rack (1.6.4) lib/rack/sendfile.rb:113:in `call'
railties (4.2.3) lib/rails/engine.rb:518:in `call'
railties (4.2.3) lib/rails/application.rb:165:in `call'
rack (1.6.4) lib/rack/lock.rb:17:in `call'
rack (1.6.4) lib/rack/content_length.rb:15:in `call'
rack (1.6.4) lib/rack/handler/webrick.rb:88:in `service'
D:/Ruby21-x64/lib/ruby/2.1.0/webrick/httpserver.rb:138:in `service'
D:/Ruby21-x64/lib/ruby/2.1.0/webrick/httpserver.rb:94:in `run'
D:/Ruby21-x64/lib/ruby/2.1.0/webrick/server.rb:295:in `block in start_thread'

按照提示，我停止 rails 输入 rake db:migrate RAILS_ENV=development 弹出错误

== 20150906003155 CreateArticles: migrating ===================================
-- create_table(:articles)
rake aborted!
StandardError: An error has occurred, all later migrations canceled:

Mysql2::Error: Table 'articles' already exists: CREATE TABLE `articles` (`id` in
t(11) auto_increment PRIMARY KEY, `content` text, `created_at` datetime NOT NULL
, `updated_at` datetime NOT NULL) ENGINE=InnoDBC:/Users/zmk pc/blog/db/migrate/2
0150906003155_create_articles.rb:3:in `change'
D:in `migrate'
ActiveRecord::StatementInvalid: Mysql2::Error: Table 'articles' already exists:
CREATE TABLE `articles` (`id` int(11) auto_increment PRIMARY KEY, `content` text
, `created_at` datetime NOT NULL, `updated_at` datetime NOT NULL) ENGINE=InnoDB
C:/Users/zmk pc/blog/db/migrate/20150906003155_create_articles.rb:3:in `change'
D:in `migrate'
Mysql2::Error: Table 'articles' already exists
C:/Users/zmk pc/blog/db/migrate/20150906003155_create_articles.rb:3:in `change'
D:in `migrate'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)

\blog\db\migrate\20150906003155_create_articles.rb 的代码如下

class CreateArticles < ActiveRecord::Migration
  def change
    create_table :articles do |t|
      t.varchar :name
      t.varchar :title
      t.text :content

      t.timestamps null: false
    end
  end
end

以下是我整个 blog 文件夹的下载地址 http://pan.baidu.com/s/1bnqbXmR

求高手指点~！

请问一下 ruby 中的代码中顶头的 #! 有什么用？

736248591 — Fri, 13 Feb 2015 12:06:05 +0800

请问一下 ruby 中的代码中顶头的 #! 有什么用？

怎么用 shoes packer 来打包 shoes

736248591 — Tue, 10 Feb 2015 15:04:32 +0800

怎么用 shoes packer 来打包 shoes

源代码：

Shoes.app height: 150, width: 250 do
  background rgb(240, 250, 208)
  stack margin: 10 do
    button "Start" do
      @time = Time.now
      @label.replace "Stop watch started at #@time"
    end
    button "Stop" do
      @label.replace "Stopped, ", strong("#{Time.now - @time}"), " seconds elapsed."
    end
    @label = para "Press ", strong("start"), " to begin timing."
  end
end

用 ocra 打包有调用到 Tk 的脚本时出错！

736248591 — Tue, 10 Feb 2015 14:44:31 +0800

错误代码如下：

c:>ocra test-tk.rb === Loading script to check dependencies D:/Ruby193-2/lib/ruby/1.9.1/tk/console.rb:13:in _create_console': interpreter is deleted (RuntimeError) from D:/Ruby193-2/lib/ruby/1.9.1/tk/console.rb:13:increate' from D:/Ruby193-2/lib/ruby/1.9.1/tk/console.rb:15:in <module:TkConsole> ' from D:/Ruby193-2/lib/ruby/1.9.1/tk/console.rb:6:in' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:474:in const_get' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:474:inblock (3 levels) in attempt_load_autoload' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:468:in each' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:468:inblock (2 levels) in attempt_load_autoload' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:466:in each' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:466:inblock in attempt_load_autoload' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:460:in loop' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:460:inattempt_load_autoload' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:706:in build_exe' from D:/Ruby193-2/lib/ruby/gems/1.9.1/gems/ocra-1.3.3/bin/ocra:1165:inblock in '

test-tk.rb 的代码如下：

require 'tk'
root = TkRoot.new { title "Hello, World!" }
TkLabel.new(root) do
   text 'Hello, World!'
   pack { padx 15 ; pady 15; side 'left' }
end
Tk.mainloop

我家的系统是 win7-64，所用的是 rubyinstaller-1.9.3-p550 以及它自带的 TK 库，但是我试过 Ruby 2.1.5-p273 也是报错。有哪位高手知道怎么解决的吗？