I’ve asked this before, but never got a working response. I’d like to
store an object inside a binary field in my db. So I’d have a class
like this
class MyAwesomeClass
def do_something_awesome
…
end
end
then
class MyRecord < ActiveRecord::Base
end
the table my_record would have a binary field, my_object, that would
store an object of MyAwesomeClass. So I could do:
r = MyRecord.new
r.my_object = MyAwesomeClass.new
r.reload
r.my_object.do_something_awesome
I saw that there’s a serialize helper, where I’d put this in my AR
class:
class MyRecord < ActiveRecord::Base
serialize :my_object
end
But that doesn’t seem to be working, it just says my_object is a
string, and none of the MyAwesomeClass methods are available to it.
I’d really appreciate any help with this.
class Serializedobj < ActiveRecord::Base
# this table has just two fields: id, data (type TEXT)
end
this class is going to be serialized
class C
attr_accessor :a, :b
def initialize( a, b ) @a, @b = a, b
end
def to_str
a.to_s + ’ ’ + b.to_s
end
end
obj= C.new('hi', 'there') # create something to be serialized
so = Serializedobj.new # create a place to store objects
so.data = Marshal.dump obj # serialize obj
so.save # save serialized data in db
id = so.id # save id so we can restore obj later
so = nil
obj= nil
so = Serializedobj.find_by_id( id ) # try to find serialized obj
unless so
raise Exception, 'serialization failed'
end
obj = Marshal.load so.data # reconstitute obj
puts obj.to_str # i'm alive!
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