links within a base

[John]

it seems one can't link within a base, i.e.
persons = Base('persons')
persons.create(('name',str),('parent',persons))
?
i'm able to fill the base with data, but i get an error when i try to
reopen it from disk, i.e.

persons = Base('persons').open()

I get
"
ERROR: An unexpected error occurred while tokenizing input
The following traceback may be corrupted or invalid
The error message is: ('EOF in multi-line statement', (30,0)
"
basically each record contains a 'parent' field with a pointer to it's
parent, and though you are able to fill the base, there seem to be
read/write (pickling?) disk issues.

just something for the wishlist :)

thanks
John

[Pierre Quentel]

Hi John,

Welcome to the group, and thanks for the report !

I didn't think of this case, but it certainly makes sense. I tried
this simple script :

=============
import random
from buzhug import Base

persons = Base('persons')

persons.create(('name',str),('parent',persons),mode="override")

for i in range(10):
persons.insert(name='pierre') # parent is set to None

for i in range(100):
persons.insert(name='simon',parent=persons[random.randint(0,10)])

persons.close()

p2 = Base('persons').open()
===============

It raised an exception, but not the one you mention, it was a "maximum
recursion depth"

I tried this patch, which worked for the test above : in line 442 of
buzhug.py, replace the block by :

if v.startswith('<base>'):
# reference to an external base
base_path = urllib.unquote(v[6:])
if base_path == self.name:
ext_db = self
else:
ext_db = Base(base_path).open()
self._register_base(ext_db)
self.fields[k] = ext_db
else:
self.fields[k] = self.types[v]

Does this solve the problem in your script ? If so I will include the
patch in a future version

Best regards,
Pierre

[Arthur]

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Pierre

   Your patch fixed the problem.

   thank you!!
 
John