以下是设置：
class Project < ActiveRecord::Base
has_many :project_subject_areas, class_name: "Project::SubjectArea"
has_many :subject_areas, through: :project_subject_areas
end
class SubjectArea < ActiveRecord::Base
has_many :project_subject_areas, class_name: "Project::SubjectArea"
has_many :projects, through: :project_subject_areas
end
class Project::SubjectArea < ActiveRecord::Base
belongs_to :project
belongs_to :subject_area, class_name: '::SubjectArea'
end
在Rails中运行：
[ SubjectArea.to_s, Project::SubjectArea.to_s ].inspect
给出：
["SubjectArea", "SubjectArea"]
但运行此服务器（服务器重启后）：
[ Project::SubjectArea.to_s, SubjectArea.to_s ].inspect
给出：
["Project::SubjectArea", "SubjectArea"]
文件结构是：
models/project.rb
models/subject_area.rb
models/project/subject_area.rb
我可以手动使用require project/subject_area绕过这个，但是我对这个命名空间做错了吗？
还有其他方法来命名我的模型吗？
当Rails生成名称空间rails generate Project::X时，我将Project作为模块，但我需要它作为ActiveRecord类。我还有一些属于Project的其他模型，我真的希望它们在命名空间和模型/项目/目录中。