当我尝试生成脚手架时出现 Rails 错误

Posted

技术标签:

【中文标题】当我尝试生成脚手架时出现 Rails 错误【英文标题】:Rails error when I try generate a scaffold 【发布时间】:2018-06-22 06:52:01 【问题描述】:

对不起我的英语我是法国人;)

当我尝试使用 rails g scaffold (data info) 生成脚手架时,我遇到了一个错误,我从来没有看到过这个

rails g scaffold title:string language:string engine:string little_description:string description:text on_production:boolean game_type:string platform:string dimension:string
      invoke  active_record
Traceback (most recent call last):
    34: from bin/rails:4:in '<main>'
    33: from bin/rails:4:in 'require'
    32: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in '<top (required)>'
    31: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/command.rb:44:in 'invoke'
    30: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/command/base.rb:63:in 'perform'
    29: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor.rb:387:in 'dispatch'
    28: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in 'invoke_command'
    27: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/command.rb:27:in 'run'
    26: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/commands/generate/generate_command.rb:24:in 'perform'
    25: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/generators.rb:269:in 'invoke'
    24: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/base.rb:466:in 'start'
    23: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/group.rb:232:in 'dispatch'
    22: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'invoke_all'
    21: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'map'
    20: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'each'
    19: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'block in invoke_all'
    18: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in 'invoke_command'
    17: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/command.rb:27:in 'run'
    16: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/group.rb:133:in '_invoke_from_option_orm'
    15: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/group.rb:266:in '_invoke_for_class_method'
    14: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/shell.rb:68:in 'with_padding'
    13: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/group.rb:277:in 'block in _invoke_for_class_method'
    12: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:115:in 'invoke'
    11: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/group.rb:232:in 'dispatch'
    10: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'invoke_all'
     9: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'map'
     8: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'each'
     7: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:133:in 'block in invoke_all'
     6: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in 'invoke_command'
     5: from /usr/local/lib/ruby/gems/2.5.0/gems/thor-0.20.0/lib/thor/command.rb:27:in 'run'
     4: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/generators/named_base.rb:236:in 'block in check_class_collision'
     3: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/generators/base.rb:249:in 'class_collisions'
     2: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/generators/base.rb:249:in 'each'
     1: from /usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/generators/base.rb:258:in 'block in class_collisions'
/usr/local/lib/ruby/gems/2.5.0/gems/railties-5.1.4/lib/rails/generators/base.rb:258:in 'const_defined?': wrong constant name Title:string (NameError)

你知道解决方案是什么 我认为问题出在主动记录上。

谢谢

【问题讨论】:

【参考方案1】:

您收到错误是因为您错过了生成命令中的模型名称。你的脚手架命令应该是

rails g scaffold <ModelName> title:string language:string engine:string little_description:string description:text on_production:boolean game_type:string platform:string dimension:string

如果你的模型名称是Product,脚手架应该是这样的

rails g scaffold Product title:string language:string engine:string little_description:string description:text on_production:boolean game_type:string platform:string dimension:string

【讨论】:

【参考方案2】:

您生成脚手架的语法不正确。

Rails 中的脚手架是一套完整的模型、该模型的数据库迁移、用于操作它的控制器、用于查看和操作数据的视图,以及用于上述各项的测试套件。

您在这里缺少模型名称

语法是rails g scaffold model_name data_hash

前任

rails g scaffold Product title:string language:string engine:string little_description:string description:text on_production:boolean game_type:string platform:string dimension:string

【讨论】:

以上是关于当我尝试生成脚手架时出现 Rails 错误的主要内容,如果未能解决你的问题,请参考以下文章

Rails 3.1.10 中脚手架生成的视图规范中缺少部分错误

运行脚手架控制器时出现 MVC 3 脚手架错误

如何更新脚手架生成的 MVC + 路由,用于在 Rails 中具有 2 个 belongs_to 关系的嵌套资源

在 Flutter 中,当我在脚手架中添加 ListView 时出现问题

Rails 生成脚手架错误消息

Rails 3:脚手架销毁动作重定向以显示动作