class Appointment < ApplicationRecord
scope :upcoming, -> { where("starts_at > ?", Time.current) }
scope :for_doctor, ->(doctor) { where(doctor: doctor) }
scope :confirmed, -> { where(status: :confirmed) }
# Combine scopes into a higher-level one
scope :doctor_agenda, ->(doctor) { upcoming.confirmed.for_doctor(doctor).order(:starts_at) }
end
# Reads like a sentence
agenda = Appointment.doctor_agenda(current_doctor)Enterprise multi-tenancy and high-throughput architectural patterns require dedicated database partitioning, connection pooling, and resilient worker strategies...
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