pharo - Smalltalk ReferenceStream has problems with new instance variables? -

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in pharo smalltalk i'm using referencestream serialise list of objects -- here's class definition of objects i'm serialising:

object subclass: #task instancevariablenames: 'title notes list project datenextaction datecreated datecompleted importance selected' classvariablenames: 'database' pooldictionaries: '' category: 'todo'

i'm using smfiledatabase method described here: http://book.seaside.st/book/advanced/persistency/image-based-persistency

this has been working well, , it's been nice not have use database prototype app.

howevere, here's problem: when add new instance variable person task load referencestream breaks:

object subclass: #task instancevariablenames: 'title notes list project person datenextaction datecreated datecompleted importance selected' classvariablenames: 'database' pooldictionaries: '' category: 'todo'

it seems not spot new variable, , load values wrong slots, person takes value of datenextaction, datenextaction takes datecreated , on.

how can stop happening?

i've got working placing new variable @ end of list, i'd group variables type.

referencestream not supported anymore , has been deleted in pharo 2.0. should use fuel written, documented, tested , fast. http://rmod.lille.inria.fr/web/pier/software/fuel


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