ruby on rails - Dual relationship to model with one polymorphic -


i have scenario have 2 models "group" , "motion". group may have many motions , every motion related group. motion may related 1 of various models of group may one.

so have has_many relationship between group & motion , polymorphic relationship between motion & group.

class group < applicationrecord   has_many :motions   has_many :motions, as: :motionable end  class motion < applicationrecord   belongs_to :group     belongs_to :motionable, polymorphic: true end

whilst appears work new record in motions creates polymorphic relationship whereas require has_many relationship:

2.4.1 :010 > group.first.motions.new   group load (1.5ms)  select  "groups".* "groups" order "groups"."id" asc limit $1  [["limit", 1]]  => #<motion id: nil, group_id: nil, motionable_type: "group", motionable_id: 1>

i have working using following:

class group < applicationrecord   has_many :motions   has_many :subjects, class_name: "motion", as: :motionable end  class motion < applicationrecord   belongs_to :group     belongs_to :motionable, polymorphic: true end

i picked following: http://guides.rubyonrails.org/association_basics.html#self-joins

i can create has_many relationship using:

group.first.motions.new

and polymorphic relationship using:

group.first.subjects.new

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