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user.rb

class User < ApplicationRecord
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable,
         :confirmable, :omniauthable

  validates :fullname, presence: true, length: {maximum: 50}

  def self.from_omniauth(auth)
    user = User.where(email: auth.info.email).first

    if user
      return user
    else
      where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
        user.email = auth.info.email
        user.password = Devise.friendly_token[0,20]
        user.fullname = auth.info.name
        user.image = auth.info.image
        user.uid = auth.uid
        user.provider = auth.provider
        # If you are using confirmable and the provider(s) you use validate emails,
        # uncomment the line below to skip the confirmation emails.
        user.skip_confirmation!
      end
    end
  end

  def self.find_for_google_oauth2(access_token, signed_in_resourse=nil)
    data = access_token.info
    user = User.where(:provider => access_token.provider, :uid.access_token.uid).first

    if user
      return user
    else
      registered_user = User.where(:email => access_token.email).first
      if registered_user
        return registered_user
      else
        user = User.create(
          name: data["name"],
          provider: access_token.provider,
          email: data["email"],
          uid: access_token.uid,
          password: Divise.friendly_token[0,20]
        )
      end
    end
  end
end