Plain User model

class User < ActiveRecord::Base
    has_many :cash_flows, :dependent => :destroy
    has_many :tags, :dependent => :destroy

    has_secure_password(validations: false)

    validates_presence_of :nick, :password
    validates_confirmation_of :password

    validates_uniqueness_of :nick, case_sensitive: false
    validates_length_of :nick, minimum: 2, maximum: 64
    validates_length_of :password, minimum: 6
end