问题
I'm doing the persistance example at:
http://book.seaside.st/book/advanced/persistency/image-based-persistency
It involves creating a method that uses the FileDirectory class like this:
SMFileDatabase class>>backupDirectory
^ (FileDirectory default directoryNamed: self name) assureExistence.
Pharo seems to be unable to find the Class and the closest that comes out in search is FileDirectoryWrapper. Will this do?
NB. I can't figure this out myself since I've never used FileDirectory or FileDirectoryWrapper before so I'm in the dark.
Later edit:
Found another one ReferenceStream. They both seem to have been deprecated. Mentioned here: http://lists.gforge.inria.fr/pipermail/pharo-project/2012-June/065765.html
Because they apparently had problems, mentioned here: Smalltalk ReferenceStream has problems with new instance variables?
Later edit 2:
It seems the answers below will work for FileDirectory, and ReferenceStream can be replaced by Fuel in newer Pharo releases. https://stackoverflow.com/a/15742159/293856
SmartRefStrem seems another solution to the bugs. All this is untested by me. Smalltalk ReferenceStream has problems with new instance variables?
However:
Those wanting to finish the example in the book need to go back in time and get a Pharo 1.4 from: https://gforge.inria.fr/frs/?group_id=1299
Scroll down and look for One-Click Pharo 1.4 and get the latest build, if there is a newer one than: https://gforge.inria.fr/frs/download.php/file/31359/Pharo-1.4-14457-OneClick.zip
or 1.3.
I got lucky with a Pharo VM from here: http://files.pharo.org/vm/pharo/20/mac/stable.zip
With a prebuilt Seaside image running on Pharo 1.3 here: http://www.seaside.st/distributions/Seaside-3.0.7-final.zip
Get your code out of the current image via Monticello and then "back" into the older image. Success!
回答1:
The simplest way to do it is like this:
self name asFileReference ensureCreateDirectory.
回答2:
Pharo switched to FileSystem some time after the book was published.
The equivalent for the first code is now
SMFileDatabase class>>backupDirectory
^(FileSystem disk workingDirectory / self name) ensureCreateDirectory
(also, regarding ReferenceStream, the answer given by Damien in the post you referenced still holds true)
来源：https://stackoverflow.com/questions/28285936/filedirectory-and-referencestream-class-equivalents-in-pharo