app/models/user.rb
# User Model
class User < ApplicationRecord
has_many :projects, dependent: :destroy
validates :email, uniqueness: true
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :confirmable
end