invitation.rb
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	# `Invitation` describes the pending invitation of a user to join a host.
	class Invitation < ActiveRecord::Base
	establish_connection ARCHIVING_CONF

	belongs_to :user
	belongs_to :host

	validates :user, :host, :verification_code, presence: true

	before_validation :calculate_verification_code

	# Sends an email to the user to inform that there is an invitation to
	# handle the client's backups.
	def notify_user
	UserMailer.notify_for_invitation(user.email, self).deliver
	end

	# Fetches the parameters that can be passed to accept_invitation_url in
	# order to generate the correct url
	#
	# @return [Hash]
	def accept_hash
	{
	host_id: host_id,
	verification_code: verification_code
	}
	end

	private

	def calculate_verification_code
	self.verification_code = Digest::SHA256.hexdigest(
	[host.name, Time.now.to_s, Rails.application.secrets.salt].join
	)
	end
	end