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Contents
require 'dm-types'
# NOTE: Do not try to clear SdbArray properties by assigning nil. Instead,
# assign an empty array:
#
# resource.array_prop = []
# resource.save
#
# The reason has to do with DataMapper's lazy-load handling - a lazy-loaded
# property has a value of nil until it is loaded. If you assign nil, DM thinks
# that
module DataMapper
module Types
class SdbArray < DataMapper::Type
primitive ::Object
lazy true
def self.load(value, property)
value
end
def self.dump(value, property)
dumped = ::Object.new
# This is a little screwy. DataMapper has a fixed list of values it
# considers primitives, and it insists that the value that comes out of
# a type's .dump() method MUST match one of these types. For SimpleDB
# Array is effectively a primitive because of the way it stores values,
# but DM doesn't include Array in it's list of valid primtive types. So
# we need to return an object which IS considered a primitive - in this
# case a plain 'ole Ruby Object. In order to convey the actual array
# value to the backend, we tack on a #to_ary method which returns the
# array data. RightAws calls Array() on all values before writing them,
# which in turn calls #to_ary(), and winds up with the correct data. In
# effect we are sneaking the array data through DataMapper inside a
# singleton method.
singleton_class = (class << dumped; self; end)
singleton_class.send(:define_method, :to_ary) do
value
end
singleton_class.send(:define_method, :to_s) do
value.to_s
end
dumped
end
def self.typecast(value, property)
value
end
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems