Ruby on Rails：未初始化的常量，NameError

Question

您好，我正在尝试解决RAILS应用程序中的名称错误。 我正在使用一个界面，该界面包含一个地图，其中包含与一定数量的项目关联的图块。

我有以下模型： area.rb

class Area < ActiveRecord::Base
  attr_accessible :map_file_name, :tile_file_name, :alt, ...

  has_many :species
  has_many :maps

end

map.rb

class Map < ActiveRecord::Base
  attr_accessible :alt, :file_name, :detail, :area_id

  belongs_to :area
end

和specie.rb

class Specie < ActiveRecord::Base
  attr_accessible :area_id, :author_id, :name, :pwclass, :pwfamily, :txtlandscape, :txtpod, :map

  has_one :author
  belongs_to :area

end

当我尝试在IRB或视图中调用资源时，出现名称错误输出。 我将specie更改为field ，将species更改为fields ，并且它在相同的配置下工作。

我检查和Ruby pluralises specie正确地species 。

我怎样才能得到specie来工作？

更新：回溯

Started GET "/projects/show/1" for 127.0.0.1 at Fri Mar 23 13:02:07 +0100 2018
Connecting to database specified by database.yml
Processing by ProjectsController#show as HTML
  Parameters: {"id"=>"1"}
  [1m[36mArea Load (1.8ms)[0m  [1mSELECT 'areas'.* FROM 'areas' WHERE 'areas'.'id' = ? LIMIT 1[0m  [["id", "1"]]
  [1m[35mMap Load (0.4ms)[0m  SELECT 'maps'.* FROM 'maps' WHERE 'maps'.'area_id' = 1
  Rendered projects/show.html.erb (28.1ms)
Completed 500 Internal Server Error in 108ms

ActionView::Template::Error (uninitialized constant Area::Species):
    28:         end %>
    29: <% else %>
    30: <% end %>
    31: <% for specie in @area.species %>
    32: <div class="speciesmap">
    33:   <div id="tile_menu">
    34:     <a onclick="ArticleRequest('/article/show/area-07.html', 'ATLAS-06');"><img src="images/MAP/GUADALQUIVIR_MAP-BUTTONS-TILE-specie.svg" onMouseOver="this.src='images/MAP/estuario_area_136x85px-blck.svg'" onMouseOut="this.src='images/MAP/GUADALQUIVIR_MAP-BUTTONS-TILE-specie.svg'" alt="Specie"></a>
  app/views/projects/show.html.erb:31:in '_app_views_projects_show_html_erb__1608931551_2294133420'
  app/controllers/projects_controller.rb:22:in `show'


  Rendered /Users/xxx/.rvm/gems/ruby-1.8.7-p374@ccc/gems/actionpack-3.2.5/lib/action_dispatch/middleware/templates/rescues/_trace.erb (0.7ms)
  Rendered /Users/xxx/.rvm/gems/ruby-1.8.7-p374@ccc/gems/actionpack-3.2.5/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (0.6ms)
  Rendered /Users/xxx/.rvm/gems/ruby-1.8.7-p374@ccc/gems/actionpack-3.2.5/lib/action_dispatch/middleware/templates/rescues/template_error.erb within rescues/layout (40.4ms)

Answer 1

将Area类中的关系更新为：

    has_many :species, :class_name => 'Specie'

然后@area.species应该可以工作。

Answer 2

作为@max在注释中突出显示。 这里的问题是物种“在单数和复数上都相同”。

这两种解决方案是使用物种作为模型名称，或者在相关模型中声明“物种”的类名称。

我都尝试过，都在工作。 最后，我选择了@max的建议。