A folder can contain following
-- One or more files
-- One or more folders (called subfolders)
-- Link to parent directory. The one referred to as a dot (.) in
Windows OS
class Folder(db.Model):
files = db.ListProperty(db.Key)
subfolders = db.ListProperty(db.Key)
parentfolder = db.SelfreferenceProperty()
The *files* attribute will contain a list of Keys of files which are
inside this folder.
The *folders* attribute will contain a list of Keys of folders which
are inside this folder
The *parent* will contain a reference to the parent folder.
This schema will work good on acyclic directory structure. For a more
broader view, you can have three Models
-- File
-- Folder
-- Folder2File
The last Model will contain a many-to-many relationship between files
and folders
> "subfolders = db.ListProperty(Folder)"
> seems not working.
subfolders = db.ListProperty(Folder)
is syntactically wrong. A ListProperty can not refer to a Model.
Cheers,
--
Pranav Prakash
"This life is more than ordinary"
>
> 2009/5/6 Pranav Prakash <pra...@gmail.com>
>
>
>
> > class Folder(db.Model):
> > name = db.StringProperty()
> > subfolders = db.ListProperty(File)
> > parent = db.SelfReferenceProperty()
>
> > This is how folder can be implemented. A folder must know what all
> > files are child. Also a folder must know the parent folder (folders in
> > case of cyclic dir structure).
>
> > Apart from this, you might also implement Linux inode system in a
> > model, for book keeping.
>
> > On May 6, 5:41 am, Tim Hoffman <zutes...@gmail.com> wrote:
> > > You will need to create a Folder entity
> > > It will need to know it's children, and you will need to support
> > > some form of url traversability to walk the folder heirarchy.
>
> > > I am doing that with zope3 components on gae
>
> > > Django doesn't normally do url traversing, but has a regex match to
> > > method
>
> > > Do you really need a folder heirarchy, have you gone down that path
> > > because you are just trying to
> > > replicate a filesystem, with out really needing those semantics ?
>
> > > If you really want this sort of functionality you might want to look
> > > at repoze.bfg it is just been
> > > made useable under gae (and is zope 3 based though much simpler) and
> > > does support inherintly
> > > the notion of url traversal over an object model/graph
>
> > > Rgds
>
> > > T
>
> > > On May 6, 6:34 am, Shedokan <shedok...@gmail.com> wrote:
>
> > > > I am porting my WebOS(Shedokan OS) to python from php so I can use it
> > > > og GAE and I came to the stage where I need to read and write files.
>
> > > > And after a lot of searching I found out that I cannot create files or
> > > > write to files.
> > > > here is my code:
>
> > > > from google.appengine.ext import db
>
> > > > class File(db.Model):
> > > > filename = db.StringProperty(multiline=False)
> > > > filedata = db.BlobProperty
> > > > date = db.DateTimeProperty(auto_now_add=True)
>
> > > > def createFile(fileName, content):
> > > > if fileName=='' or content=='':
> > > > return
> > > > file = File()
> > > > file.filedata = content
> > > > file.filename = fileName
> > > > file.put()
>
> > > > def getFile(fileName):
>
> > > > if fileName=='':
> > > > return
> > > > return db.GqlQuery('SELECT * FROM File WHERE filename=
> > :1',fileName)
>
> > > > any way to make this work with a folder structure?
>
> > > > also I want to note that I started learning python just about 3 days
> > > > ago, so I think I'm a begginer.
>
> > > > thanks.
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