user.rb
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	class User < ActiveRecord::Base
	devise :database_authenticatable, :registerable,
	:recoverable, :rememberable, :trackable, :validatable

	has_many :memberships
	has_many :groups, through: :memberships

	scope :orphans, -> { includes(:memberships).where(:memberships => { user_id: nil }) }

	# Check if the user can change his password
	#
	# Remote users are not able to change their password
	def can_change_password?
	!identifier?
	end

	def self.find_for_database_authentication(conditions)
	# Override devise method for database auth
	# We only want to auth local user via the database.

	find_first_by_auth_conditions(conditions, identifier: '')
	end
	end