Zope September 2004

zope@zope.dev

164 participants
292 discussions

Re: [Zope] convert python to dtml
by Jaroslav Lukesh 06 Aug '09

06 Aug '09

> Odesílatel: Exteam <exteam6(a)yahoo.co.in> > hi all, > i'm stuck at this point, > can some one convert thge following python code in to > dtml & help me. > i'm not able to convert it in to dtml. Why do you want to recode into DTML? I think that is piece of good code and much faster than DTML. You could try following replacing (original line of your code, follows with DTML code), but not tested: > rec = context.test_select_sql() <dtml-call "REQUEST.set(rec , test_select_sql())"> > print "Fields definitions" Fields definitions > recordset = rec.dictionaries() <dtml-let "recordset = rec.dictionaries()" > rownum = 1 <dtml-call "REQUEST.set(rownum,1)" > for record in recordset: <dtml-in recordset> > print "Row %d" % (rownum), "check", record Row <dtml-var rownum>, check <drml-var sequence-item><br> > rownum = rownum + 1 <dtml-call "REQUEST.set(rownum,rownum+1)" </dtml-in> and so on on the rest of code. > for key in record.keys(): > print key, "=", record[key] > print "-" * 80 > return printed

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Clarification: uncatalog_object question
by Jonathan Hobbs 11 Oct '06

11 Oct '06

Typo in dtml-in statement... > I have a ZCatalog which contains about 850k entries. Each entry is a zclass > instance which is NOT 'catalog aware' (ie. catalog_object was used to > explicitly add the record to the zcatalog). > > The records exist in the zcatalog and I can access a single record's > data_record_id_ by: > > <dtml-call "REQUEST.set('recid', '1049298593')"> > <dtml-in "Catalog({'master_recid' : recid})"> > <dtml-call "REQUEST.set('drid', data_record_id_)"> > </dtml-in> > drid= <dtml-var drid> Incorrect (typo): <dtml-in "Catalog({'master_recid' : recid})"> Corrected: <dtml-in "Catalog({'id' : recid})"> > Displays: > > drid= 17223047659 > > All is well, so far... I now want to remove the record from the ZCatalog: > > <dtml-call "Catalog.uncatalog_object(recid)"> > > generates the following error in my log file: > > 2004-07-02T11:13:07 ERROR(200) Catalog uncatalogObject unsuccessfully > attempted to uncatalog an object with a uid of 1049298593. > > and > > <dtml-call "Catalog.uncatalog_object(drid)"> > > generates the following error in my log file: > > 2004-07-02T11:21:07 ERROR(200) Catalog uncatalogObject unsuccessfully > attempted to uncatalog an object with a uid of 1722304759. > > So, how do you remove a 'non-catalog aware' object from a zcatalog? (this is > the first time I have used non-catalog aware instances, in previous projects > I used catalog-aware objects and just deleted the object in the folder and > the object was automatically removed from the zcatalog). I don't understand why the uid of 1049298593 works in retrieving the record from the zcatalog, but not when used to delete the record from the zcatalog?! (I have looked at the code in Catalog.py and nothing in the uncatalog_object method provides any hints as to why this problem is occuring). Any ideas would be really appreciated! Thanks, Jonathan

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Production Advice
by Jonathan Cyr 11 Oct '06

11 Oct '06

Greetings All, After a long dev cycle, I'm putting a Zope web app into production shortly... and need some advice. What is a good daily backup strategy with Zope 2.71? I'll be running ZEO, and only use three add-on products, Formulator, VarImage and PIL. My application consists of regular items in the ZODB, two python Products, and a half-dozen ZClasses Right now, I'm developing on a WinXP machine, and am considering SuSE 9.1 for my spec, any experiences, good or bad?... YAST2-installed or manually? All advice would be helpful as I weigh my options, -Jon Cyr cyrj(a)cyr.info

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manage_beforeDelete
by Garito 10 Oct '06

10 Oct '06

Hi all! I have a class like these: class Test(CatalogAware, , OrderedFolder): def manage_beforeDelete(self, item, container): CatalogAware.manage_beforeDelete(item, container) OrderedFolder.manage_beforeDelete(item, container) I only put the relevant code If I delete de hook to manage_beforeDelete the class works fine (the objects disappear from the catalog) but if I put the function the catalog don't delete the objects any idea? Thanks!!

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doc string rules
by Dennis Allison 10 Oct '06

10 Oct '06

I just had LocalFS break under Zope 2.6.4 with Python 2.3.4 due to a "missing docstring". What are the current rules? Must everything (procedures, methods, classes, modules) have docstrings? Even when running with Z_DEBUG_MODE set to "yes".

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RE: [Zope] .%252e Strangeness
by Passin, Tom 09 Oct '06

09 Oct '06

> From: zope-bounces+tpassin=mitretek.org(a)zope.org [mailto:zope- > > If I request this url with my browser: > http://zope website/.%252e/.%252e/.%252e/testing > from my website I get this page back: URLs are not supposed to contain Unicode characters above the ascii range, but there is a movement to use them all. However, some browsers (and servers) can handle them and some cannot. Often there is a configuration setting for this. Probably your browser is just omitting them, and that is why you are getting the default Zope page. Cheers, Tom P

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LocalFS problems with @import-ing stylesheets
by Paul Smith 11 Oct '05

11 Oct '05

Hi We've just upgraded to using LocalFS (LocalFS-1-3-andreas for the large file support) with Zope 2.7.2, and have been experiencing problems with accessing stylesheets via the @import command from within a LocalFS folder. eg: <style type="text/css" media="screen">  </style> where /site is the LocalFS folder. The problem only manifests itself using Mozilla browsers (Mozilla, Firefox, etc), and when using these browsers stylesheets are successfully requested (according to the Apache access logs) but are ignored within the page. The stylesheet validates, and works as expected if moved inline within the page, or when created as a Zope File object, rather than within LocalFS. This all worked fine on the previous versions of LocalFS we were using (1.1.0) with Zope 2.6.4. Any ideas if this is a Zope or a LocalFS thing? Cheers Paul -- ---------------------------------------------------------------------- Paul.Smith(a)bristol.ac.uk ---------------------------------------------------------------------- Senior Technical Officer | Technical Manager Internet Development Group | RDN Virtual Training Suite http://www.ilrt.bris.ac.uk/id/ | http://www.vts.rdn.ac.uk/ ---------------------------------------------------------------------- Institute for Learning and Research Technology, University of Bristol, 8-10 Berkeley Square, Bristol BS8 1HH, UK Tel: +44 (0)117 928 7192, Fax: +44 (0)117 928 7112

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How to modify 'title' of an object
by Rares Vernica 29 May '05

29 May '05

Hi, How can I modify the 'title' of an object in DTML? Thanks in advance, Rares _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

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RE: [Zope] How to handle ZODB conflict errors
by Sean Hastings 15 Nov '04

15 Nov '04

The slowdowns result when various transactions are trying to modify the same data. When a conflict happens, one of the transactions is rolled back and attempted again from the beginning. If the transaction takes a long time to execute, and this happens many times, the delays can be considerable. Only after some number of attempts, with continuing conflicts occurring, will the transaction give up and allow the Conflict Error to actually be raised back to the level of producing an error page, but each one will be logged in your event.log file. I wrote the following to explain conflicts to my own satisfaction: ------------------------------------------------------------------- There are two types of conflict errors: Read Conflict: -------------- Transaction 1 reads object A. Transaction 2 modifies object B. Transaction 1 attempts to read object B, but notices that object B has been modified since Transaction 1 began to read data. Since the data it read from A, and the data that it now finds in B are not necessarily consistent, a Read Conflict Error is produced. Transaction 1 rolls back and restarts. Write Conflict: --------------- Transaction 1 reads object A. Transaction 2 modifies object A. Transaction 1 attempts to modify object A, but notices that object A has been modified since it was read. Since overwriting the changes made by Transaction 2 would cause "lost update problems" and possible data inconsistency, a Write Conflict Error is produced. If conflict is not handled (see below), Transaction 1 rolls back and restarts. Solutions: --------- Read Conflicts - If you do not care about consistency during your read, you can execute the statement "get_transaction().commit()" after each new object accessed. This breaks your transactions up into smaller transactions that are MUCH less likely to cause conflicts. I understand that Zope 2.8 (alpha any day now) will eliminate Read Conflicts by including the ability to read old constant states. In the example above, Transaction 1 would then just read the old state of B before Transaction 2 had modified it. Write Conflicts - You can define a method on any ZODB object called "_p_resolveConflict". When a write conflict occurs, the first thing that happens is that Zope tries to call this method to handle the problem, passing it all the possible states of the object: OLD, FOUND, and TRIED. OLD is the state that the transaction first read. FOUND is the new modified state that some other transaction saved the object as. TRIED is the state that the transaction wanted to save the object as when it realized that there was a conflict. This method is intended to return a merged version of the two objects. If you do not care about lost updates, this method could be as simple as: def _p_resolveConflict(self,old,found,tried): return tried ------------------------------------------------------------------- Here is an example of some code that I think works to handle write conflicts in an order independent list. The object in question is a ZODB wrapper for a list. The [] is stored in the "data" element referred to in saved.data, old.data, etc: def _p_resolveConflict(self,old,saved,new): """ Merges two possible list states Accounts only for additions and deletions, not changes of order Prevents duplicate add or remove of same Item during conflict """ #get changes made in saved state saved_added = [] saved_removed = [] for item in saved.data: for i in range(saved.count(item) - old.count(item)): saved_added.append(item) for item in old.data: for i in range(old.count(item) - saved.count(item)): saved_removed.append(item) #get changes made in new state new_added = [] new_removed = [] for item in new.data: for i in range(new.count(item) - old.count(item)): saved_added.append(item) for item in old.data: for i in range(old.count(item) - new.count(item)): new_removed.append(item) #get duplicate changes both_added=[] for item in new_added: if saved_added.count(item): both_added.append(item) new_added.remove(item) saved_added.remove(item) both_removed=[] for item in new_removed: if saved_removed.count(item): both_removed.append(item) new_removed.remove(item) saved_removed.remove(item) #apply changes old.extend(saved_added) old.extend(new_added) old.extend(both_added) for item in saved_removed: old.remove(item) for item in new_removed: old.remove(item) for item in both_removed: old.remove(item) return old

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local file system
by VIGNAUX Philippe 10 Oct '04

10 Oct '04

Hi all ! My zope config : Zope 2.6.4 (binary release, python 2.1, win32-x86), python 2.1.3, win32 I have installed the < local file system > package ; it's partly working fine but i tough have the following problem : I'm in the ZMI and I'm entering into the local file system I have created (let's call it < my_local_fs > ) In the < security > tab, I try to update the checkboxes related to < anonymous > or < manager >. When i use the < save changes > button I receive the error message < Some permissions had errors: View management screens > Can anybody explain why this happen ? ( Moreover, I don't know where the < management screens > are ...) Thank's in advance for any help. Phil. ########################################### This message has been scanned by ICT - Africa Museum

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Zope September 2004