app/models/user.rb
class User < ApplicationRecord
# Others available are:
# :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable, :recoverable,
:rememberable, :trackable, :validatable, :confirmable
has_many :time_entries, dependent: :destroy
has_many :tags, dependent: :destroy
has_many :tasks, dependent: :destroy
ADDITIONAL_FIELDS = [:username, :display_name].freeze
end