rails class sti reminders code example

Example 1: rails class sti reminders

class AddNotes < ActiveRecord::Migration[5.2]
  def change
    create_table :notes do |t|
      t.string :type # this tells Rails we plan on using STI
      t.string :title
      t.boolean :is_completed
      t.jsonb :data, default: {}
      t.timestamps
    end

    add_index :notes, :data, using: :gin
  end
end

Example 2: rails class sti reminders

require 'test_helper'
require 'time'

class ReminderTest < ActiveSupport::TestCase
  setup do
    @reminder = Reminder.first
  end

  test 'should access methods from base class' do
    assert_equal false, @reminder.completed?
  end

  test 'should not have data from alerts' do
    assert_not_respond_to @reminder, :alert_at
  end
end

class AlertTest < ActiveSupport::TestCase
  setup do
    @alert = Alert.first
  end

  test 'should access data from json' do
    assert_equal Time.parse("2018-08-06 17:08:24 +0200"), @alert.alert_at
  end
end

class NotesTest < ActiveSupport::TestCase
  setup do
    @notes = Note.all
  end

  test 'should return our domain model instead of base class' do
    @notes.each do |n|
      assert n.class == Alert || n.class == Reminder
    end
  end
end

Example 3: rails class sti reminders

# Fixtures
sample_alert:
  type: "Alert"
  title: "Buy milk"
  is_completed: false
  data: '{"alert_at": "2018-08-06 17:08:24 +0200"}'

sample_reminder:
  type: "Reminder"
  title: "Short AAPL before autumn keynote"
  is_completed: false

Example 4: rails class sti reminders

class Note < ActiveRecord::Base
  def completed?
    is_completed
  end
end

class Reminder < Note; end

class Alert < Note
  typed_store :data, coder: JSON do |s|
    s.datetime :alert_at
  end
end