Question

The following work, but is the Cleanest approach?

简言之,一个项目:大任务。任务以科学、技术和革新司为代表,任务的不同次类别是:模块(和子类):

# schema
create_table projects do |t|
  # t.integer :id  - implicitly generated
end
create_table task_bases do |t|
  # t.integer :id  - implicitly generated
  t.string    :type        # for STI support
  t.integer   :project_id
end

# file: app/models/project.rb
class Project < ActiveRecord::Base
  :has_many :tasks, :class_name => "Task::Base", :dependent => :destroy
end

# file: app/models/task.rb
module Task
  def self.table_name_prefix
    "task_"
  end
end

# file: app/models/task/base.rb
module Task
  class Base < ActiveRecord::Base
    :belongs_to :project
  end
end

# file app/models/task/priority.rb
module Task
  class Priority < Base
    :belongs_to :project
  end
end

几个问题:

Task::Base should never be instantiated -- we ll only use sub-classes of it. I think this means that I declare it as an abstract_class -- what s the proper way to do that?
Would it be better to name the STI table tasks rather than task_bases, and if so, what other changes need to happen?
Should I be troubled by the :class_name => "Task::Base" declaration?

Answer 1

如上所述,上述工作正在进行。但是,在你有任务的共同情况下:模块、任务:基本类别和几个任务子类别:基本,以下是清洁的:

define your STI table using the module name

create_table task_bases do |t|
  # t.integer :id  - implicitly generated
  t.string    :type        # for STI support
  t.integer   :project_id
end

create app/models/`<module_name>`.rb

该档案仅包括<代码><module_name>以下分标题的所有档案:

# file: app/models/task.rb
module Task
  require  task/base   # comment out unless task/base.rb must be loaded first
  Dir[Rails.root.join("app/models/task/**/*.rb").to_s].each {|f| require f}
end

create app/models/`<module_name>`/base.rb

此处所有子类别共同使用的任何功能。请注意,这正是我们界定科学、技术和创新表格名称的。

# file: app/models/task/base.rb
module Task
  class Base < ActiveRecord::Base
    self.table_name =  tasks 
    # include common functionality here
  end
end

create any subclasses you need.

# file: app/models/task/batch.rb
module Task
  class Batch < Base
    # batch specific code here
  end
end
# file: app/models/task/sequential.rb
module Task
  class Sequential < Base
    # sequential specific code here
  end
end

define your STI table using the module name

create app/models/<module_name>.rb

create app/models/<module_name>/base.rb

create any subclasses you need.

友情链接

create app/models/`<module_name>`.rb

create app/models/`<module_name>`/base.rb