sunspot search assiocation using joins - ruby-on-rails

Question

here's a list of model and their relation below:
class Section
has_many :students, as: :resource
searchable do
integer :id
join(:first_name, prefix: "student", target: Student, type: :text, join: {from: :resource_id, to: :id})
join(:last_name, prefix: "student", target: Student, type: :text, join: {from: :resource_id, to: :id})
end
end
class Student
belongs_to :resource, polymorphic: true, optional: false
has_many :contact_number, as: :resource
searchable do
text :first_name
text :last_name
integer :id
integer :resource_id
string :first_name
string :last_name
end
end
class ContactNumber
belongs_to :resource, polymorphic: true, optional: false
end
as you can see in my class model Section has many students. I can search student "first_name" and student "last_name" because of the help of joins. is there possible way to search student contact numbers. using of joins??? or what is the workaround to search the contact numbers in Section model?

Answer 1

in my ContactNumber model, i create an another joins
class ContactNumber
searchable do
string :ref_id do
if resource_type == "Student"
[resource.resource_type, resource.resource_id].join("_").downcase()
end
end
end
in my Student model
searchable do
string :ref_id do
[resource_type, resource_id].join("_").downcase()
end
join(:content, prefix: "contact_number", target: ContactNumber, type: :text, join: {from: :ref_id, to: :ref_id})
end
last in my Section class
class Section
searchable do
string :ref_id do
[self.class.name, id].join("_").downcase()
end
join(:content, prefix: "number", target: ContactPerson, type: :text, join: {from: :ref_id, to: :ref_id})
end
end