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Ruby on Rails nuggets

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Keeping Controllers Skinny with Service Objects (Premium)

Ruby on Rails ruby

When a controller action does five things, it becomes hard to test and reuse. A service object captures one business operation in a single, callable class you can test in...

# app/services/register_patient.rb
class RegisterPatient
  def self.call(**args) = new(**args).call

  def initialize(name:, email:)
    @name = name
    @email = email
  end

  def call
    patient = Patient.create!(name: @name, email: @email)
    WelcomeMailer.with(patient: patient).greeting.deliv...
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Readable Queries with ActiveRecord Scopes (Premium)

Ruby on Rails ruby

ActiveRecord scopes name your common queries so they read like intent, not SQL. They are chainable, composable, and keep filtering logic on the model where it belongs.

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) { upcomi...
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