ruby - Mongoid: Referencing Same Model More Than Once Through has_many -

i'd able reference model (a has_many relationship) more once in same model. example, given following models:

class mymodel     include mongoid::document      field :name, type: string     has_many :main_efforts, :class_name => 'effort', as: :effortable, dependent: :delete, autosave: true     has_many :secondary_efforts, :class_name => 'effort', as: :effortable, dependent: :delete, autosave: true      validates_presence_of :name end  class effort     include mongoid::document      field :name, type: string     belongs_to :effortable, polymorphic: true     validates_presence_of :name end 

as can see, effort model referenced twice. originally, effort model wasn't polymorphic, seemed mongoid unable determine collection (main_efforts or secondary_efforts) effort belonged to. such, made polymorphic. after making polymorphic, however, main_efforts , secondary_efforts fields empty array.

what proper way reference polymorphic model more once in same model (assuming polymorphic model necessary)?

figured out:

class mymodel     include mongoid::document      field :name, type: string     has_many :main_efforts, :class_name => 'effort', dependent: :delete, autosave: true, :inverse_of => :main_effort     has_many :secondary_efforts, :class_name => 'effort', dependent: :delete, autosave: true, :inverse_of => :secondary_effort      validates_presence_of :name end  class effort     include mongoid::document      field :name, type: string     belongs_to :main_effort, :class_name => 'conop', :inverse_of => :main_efforts     belongs_to :secondary_effort, :class_name => 'conop', :inverse_of => :secondary_efforts     validates_presence_of :name end