On Apr 22, 2008, at 4:08 PM, Jerome Peace wrote:
[Squeakland] Error loading project with plugin. or what do you do with MorphicExtentionPlus when the class isn't there?
Hi Scott, (Hi Yoandy)
I ran into this problem with the olpc image.
On a lucky guess I answered the question about which "modern" class to use to replace "MorphicExtentionPlus" with "MorphicExtention" (the old class). This, to my surprise, worked. So I took a closer look and saw that so far the ..Plus extentions purpose was to optimize layout time by making ivars out of properties in the otherProperties dictionary. By using the old extention the optimization is lost but nothing is really broken.
Maybe someone can formalize this workaround?
While it's true that some projects created in olpc-based images can indeed be successfully loaded into an old Squeakland plug-image using the workaround Jerome discovered, most projects will encounter numerous other roadblocks of a similar nature, none of them as simply worked around as in the MorphExtensionPlus case. Every object present in the project which belongs to a class added or changed during the past year and a half of intensive development of the etoys system on the olpc will cause difficulties when you try to load it into the older image.
-- Scott