mysql - get list of parent records from a list of child records with joins or includes -

lets suppose have models

class parent < activerecord::base   has_many :kids end  class kid < activerecord::base   belongs_to :parent end

and have array of kids

[k1, k2, k3, k4]

i want list of parents of these kids like

[p1, p2]

i want use of includes or joins 1 can me.

if want via active record:

parent.joins(:kids).where("kids.id" => array_of_kids).pluck(:id)

Deter