| Module | CouchRest::Validation::ValidatesLength | 
| In: | lib/couchrest/validation/validators/length_validator.rb | 
Validates that the length of the attribute is equal to, less than, greater than or within a certain range (depending upon the options you specify).
@option :allow_nil<Boolean> true/false (default is true) @option :minimum ensures that the attribute‘s length is greater than
or equal to the supplied value
@option :min alias for :minimum @option :maximum ensures the attribute‘s length is less than or equal
to the supplied value
@option :max alias for :maximum @option :equals ensures the attribute‘s length is equal to the
supplied value
@option :is alias for :equals @option :in<Range> given a Range, ensures that the attributes length is
include?'ed in the Range
@option :within<Range> alias for :in
@example [Usage]
  class Page
    property high, Integer
    property low, Integer
    property just_right, Integer
    validates_length :high, :min => 100000000000
    validates_length :low, :equals => 0
    validates_length :just_right, :within => 1..10
    # a call to valid? will return false unless:
    # high is greater than or equal to 100000000000
    # low is equal to 0
    # just_right is between 1 and 10 (inclusive of both 1 and 10)