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module Validation
module Rule
# Length rule
class Length
# params can be any of the following:
#
# - :minimum - at least this many chars
# - :maximum - at most this many chars
# - :exact - exactly this many chars
#
# Example:
#
# {:minimum => 3, :maximum => 10}
# {:exact => 10}
def initialize(params)
@params = params
end
# returns the params given in the constructor
def params
@params
end
# determines if value is valid according to the constructor params
def valid_value?(value)
@params.each_pair do |key, param|
return false if key == :minimum && (value.nil? || value.length < param)
return false if key == :maximum && !value.nil? && value.length > param
return false if key == :exact && (value.nil? || value.length != param)
end
true
end
def error_key
:length
end
end
end
end
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