在轨道上创建新记录ruby的问题

时间：2014-01-07 18:34:50

标签： ruby-on-rails activerecord rails-activerecord

我曾尝试使用lynda.com视频命令并陷入不同阶段。请帮忙

所以我输入

rails console

然后我输入以下内容

irb(main):001:0> subject = Subject.create (:name => "Second Subject", :position =>2)

但我得到了这个语法错误，我不知道！请帮忙

SyntaxError: (irb):1: syntax error, unexpected =>, expecting ')'
subject = Subject.create (:name => "Second Subject", :position =>2)
                                  ^
(irb):1: syntax error, unexpected ',', expecting end-of-input
subject = Subject.create (:name => "Second Subject", :position =>2)
                                                    ^
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'
irb(main):002:0> subject = Subject.create 
Mysql2::Error: Table 'simple_cms_development.subjects' doesn't exist: SHOW FULL FIELDS FROM `subjects`
ActiveRecord::StatementInvalid: Mysql2::Error: Table 'simple_cms_development.subjects' doesn't exist: SHOW FULL FIELDS FROM `subjects`
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:287:in `query'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:287:in `block in execute'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:435:in `block in log'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activesupport-4.0.2/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:430:in `log'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:287:in `execute'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/mysql2_adapter.rb:222:in `execute'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:301:in `execute_and_free'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:462:in `columns'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/schema_cache.rb:114:in `block in prepare_default_proc'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/schema_cache.rb:56:in `yield'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/connection_adapters/schema_cache.rb:56:in `columns'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/model_schema.rb:208:in `columns'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/model_schema.rb:249:in `column_defaults'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/locking/optimistic.rb:169:in `column_defaults'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/core.rb:171:in `initialize'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/inheritance.rb:27:in `new'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/inheritance.rb:27:in `new'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.0.2/lib/active_record/persistence.rb:36:in `create'
    from (irb):2
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.0.2/lib/rails/commands/console.rb:90:in `start'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.0.2/lib/rails/commands/console.rb:9:in `start'
    from /Users/muhammedz786/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/railties-4.0.2/lib/rails/commands.rb:62:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'irb(main):003:0>

3 个答案:

答案 0 :(得分：1)

你不应该在括号前加上空格

# Bad
subject = Subject.create (:name => "Second Subject", :position =>2)

# Good
subject = Subject.create(:name => "Second Subject", :position =>2)

答案 1 :(得分：1)

我认为您不需要逗号，因为您关闭了引文并确定了位置。

答案 2 :(得分：1)

据我所知，这是因为没有加载数据库架构或在应用程序上运行所有迁移。

我从您的堆栈跟踪中获取此信息，其中包含以下内容：

  
    

Mysql2 ::错误：表'simple_cms_development.subjects'不存在：显示来自subjects的完整字段     ActiveRecord :: StatementInvalid：Mysql2 :: Error：表'simple_cms_development.subjects'不存在：显示来自subjects

的完整字段   

这在堆栈中早于语法错误显示，这意味着它很可能是您问题的根本原因。对于rails，最好不要假设它告诉你的第一件事是手头的问题，而是检查堆栈。

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