class Identity < ApplicationRecord
  belongs_to :user

  PROVIDERS = %w[facebook google].freeze

  PROVIDERS.each do |provider|
    scope provider, -> { where(provider: provider) }
  end

  validates :uid, uniqueness: { scope: :provider }, presence: true
  validates :provider, inclusion: {
    in: PROVIDERS,
    message: 'this provider is not supported'
  }, presence: true

  def self.providers
    PROVIDERS
  end

  def self.valid_provider?(provider)
    providers.include?(provider.to_s)
  end
end