Generate multiple records based on association - ruby-on-rails

Question

The case is that I have two models with relations many to many. But I want to make a query where I have the number of models multiplied by the relations where I have the same main model with one that has one relation. Here is the case in code:
# models/physician.rb
class Physician < ApplicationRecord
has_many :appointments
has_many :patients, through: :appointments
end
# models/patient.rb
class Patient < ApplicationRecord
has_many :appointments
has_many :physicians, through: :appointments
end
# models/appointment.rb
class Appointment < ApplicationRecord
belongs_to :physician
belongs_to :patient
end
# models/extended_physician.rb
class ExtendedPhysician < ApplicationRecord
self.primary_key = 'id'
has_one :appointment, foreign_key: 'physician_id'
has_one :patient, foreign_key: 'physician_id', through: :appointment
end
# sql view created in scenic for extended_physician model
SELECT "physicians".* FROM "physicians"
LEFT OUTER JOIN "appointments" ON "appointments"."physician_id" = "physicians"."id"
LEFT OUTER JOIN "patients" ON "patients"."id" = "appointments"."patient_id"
# schema
create_table "appointments", force: :cascade do |t|
t.bigint "physician_id"
t.bigint "patient_id"
t.datetime "appointment_date"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.index ["patient_id"], name: "index_appointments_on_patient_id"
t.index ["physician_id"], name: "index_appointments_on_physician_id"
end
create_table "patients", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "physicians", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_view "extended_physicians", sql_definition: <<-SQL
SELECT physicians.id,
physicians.name,
physicians.created_at,
physicians.updated_at
FROM ((physicians
LEFT JOIN appointments ON ((appointments.physician_id = physicians.id)))
LEFT JOIN patients ON ((patients.id = appointments.patient_id)));
SQL
# test
RSpec.describe ExtendedPhysician, type: :model do
describe 'patiens relation' do
it 'retunrs correct patiens' do
patient1 = Patient.create!
patient2 = Patient.create!
Physician.create!(patients: [patient1, patient2])
expect(ExtendedPhysician.count).to eq(2)
# this not pass because relations ids are same like [patien1.id, patient1.id]
expect(ExtendedPhysician.all.map(&:patient).pluck(:id)).to eq([patient1.id, patient2.id])
end
end
end
And as you can see this test will not pass.
I would like to achieve exactly that this test passes it does not have to be a has_one relation it may be some method in the model but I do not know how to do it right