stevenbeales / mental-test

# Model to represent a study arm

class Arm < ApplicationRecord

  belongs_to :schedule, inverse_of: :arms 

  delegate :study, to: :schedule, allow_nil: true

  has_many :study_events, dependent: :destroy

  validates :name, presence: true

  validates :schedule, presence: true

  validates_uniqueness_of :number, scope: %i[schedule name] 

  validates :number, presence: true, allow_blank: false

  validates :number, numericality: { only_integer: true, greater_than_or_equal_to: 1, less_than_or_equal_to: 10_000 }

  after_initialize :set_default_number

  before_validation :add_name_if_missing

  def to_s

    "#{study} #{schedule} #{name} #{number}"

  end

  private

  def add_name_if_missing

    self.name ||= 'arm ' + number.to_s

  end

# == Schema Information

#

# Table name: arms

#

#  id          :integer          not null, primary key

#  name        :string           not null

#  number      :integer          not null

#  schedule_id :integer          not null

#  created_at  :datetime         not null

#  updated_at  :datetime         not null

#

# Indexes

#

#  index_arms_on_name         (name)

#  index_arms_on_number       (number)

#  index_arms_on_schedule_id  (schedule_id)

#  index_by_schedule_name     (schedule_id,id,name) UNIQUE

#  index_by_schedule_number   (schedule_id,id,number) UNIQUE

#