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module ActiveModel
module Type
class Integer < Value # :nodoc:
include Helpers::Numeric
# Column storage size in bytes.
# 4 bytes means a MySQL int or Postgres integer as opposed to smallint etc.
DEFAULT_LIMIT = 4
def initialize(*)
super
@range = min_value...max_value
end
def type
:integer
end
def deserialize(value)
return if value.nil?
value.to_i
end
def serialize(value)
result = cast(value)
if result
ensure_in_range(result)
end
result
end
protected
attr_reader :range
private
def cast_value(value)
case value
when true then 1
when false then 0
else
value.to_i rescue nil
end
end
def ensure_in_range(value)
unless range.cover?(value)
raise ActiveModel::RangeError, "#{value} is out of range for #{self.class} with limit #{_limit}"
end
end
def max_value
1 << (_limit * 8 - 1) # 8 bits per byte with one bit for sign
end
def min_value
-max_value
end
def _limit
self.limit || DEFAULT_LIMIT
end
end
end
end
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