November 2000 - Zope

Re: [Zope] ZCatalog and LoginManager - be aware.
by Oliver Bleutgen 29 Nov '00

29 Nov '00

> The problem is that one of your databases doesn't define the commit_sub() > and abort_sub() methods on the DB class it exposes. You don't say which > SQL > database you're using, but this happened to me on a consulting project > with > ZOracleDA. A solution is to add the following methods to the database > adapter's DB class inside DB.py: > def commit_sub(self, *arg, **kw): > pass > def abort_sub(self, *arg, **kw): > pass > This isn't optimal, because it sort of breaks transactional integrity, but > it does make it work. Thanks for your reply. I use ZPoPyDA (0.6.4 says the readme). I think I will not apply that patch (thanks nonetheless), because I have no requirements for indexing big amounts of text. And as I understand it, _indexing_ (as opposed to normal searches) is the only action where subtransactions help. My main motivation for posting was to get that problem into the public, so that others may find it while doing desperate searches in this mailing list ;-). And perhaps - if I dare - to suggest to disable subtransactions in ZCatalog by default. cheers, oliver

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ZCatalog and LoginManager - be aware.
by Oliver Bleutgen 29 Nov '00

29 Nov '00

Hi, I just wanted to mention a IMO bad pitfall when using ZCatalog, for the sake of sparing others some time. I'm running Zope 2.2.2 with LoginManager with SQL in a subfolder and was getting the following error when trying to find dtml-documents into ZCatalog: Error Type: AttributeError Error Value: commit_sub Traceback (innermost last): File /home/local-extranet/web/zope3/Zope-2.2.2-src/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /home/local-extranet/web/zope3/Zope-2.2.2-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /home/local-extranet/web/zope3/Zope-2.2.2-src/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: Traversable) File /home/local-extranet/web/zope3/Zope-2.2.2-src/lib/python/ZPublisher/Publish.py, line 175, in publish File /home/local-extranet/web/zope3/Zope-2.2.2-src/lib/python/Zope/__init__.py, line 235, in commit File /home/local-extranet/web/zope3/Zope-2.2.2-src/lib/python/ZODB/Transaction.py, line 261, in commit AttributeError: (see above) All other object-types (incuding dtml-methods) seem to work. I have put no restrictions on which files I want found, but restricting something to reduce the number of found objects helps. I fiddled around somewhat and discovered that disabling subtransactions in ZCatalog does help (required for using ZSQL Methods and ZCatalog in the same transaction). Now I use SQL-based LoginManager, but why on earth did it only fail on DTML-Documents? Is it because I have much more of them so only then ZCatalog's subtransactions come into play? Another question, why did the above also fail although I didn't restrict any viewer permissions when searching? (i.e. why got LoginManagers ZSQL-Methods started at all?). cheers, oliver

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Re: [Zope] context in Python Script
by Dieter Maurer 28 Nov '00

28 Nov '00

Chris Gray writes: > .... "context" in external Python Script .... I do not yet know, what an external Python script is. In the old "external methods", you had to use "self" as first parameter. Then (in most cases), you could use "self" inside the function body, as you would now use "context". Maybe, you give it a try. Dieter

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Re: [Zope] Instance within Instance
by Dieter Maurer 28 Nov '00

28 Nov '00

Daryl Stultz writes: > Tim Cook wrote: > > The problem here is that even though you set REQUEST, it is a > > string. You need to be in the context of the parent _object_. You > > should try <dtml-with "_.getitem(parent_id)">. > > Sorry, I thought of more... > It's my understanding that dtml-with simply pushes a namespace onto the > stack. What relationship does this have with the context that a new > ZClass instance is created in? "class2" is looked up in this namespace. The top element is asked first for "class2". "class2" is found (by acquisition) from your "class1" Z instance (called "i1"). Thus, what is actually called is (class2 __of__ i1).createInObjectManager(....) "createInObjectManager" looks in "(class2 __of__ i1).aq_parent" (this is "i1") for "_setObject". Apparently, it does not find it there. Then it looks at "i1.aq_parent" (this is the folder, "i1" is contained in). There, it has success and creates the object. Dieter

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Re: [Zope] html expertise anyone. <3A23A8D6.ECDD8BBF@nipltd.com>
by Dieter Maurer 28 Nov '00

28 Nov '00

Robin Becker writes: > In article <3A23A8D6.ECDD8BBF(a)nipltd.com>, Chris Withers > <chrisw(a)nipltd.com> writes > >Robin Becker wrote: > >> > >> I can do this using a class > > > >So maybe do it using a class then? ;-) > > > >Chris > > > yes I am, but surely there has to be a way to do this stuff in line. > That way I don't have to predefine all the link behaviours and include > in the standard header. I know that the pseudo class things are called > :link :active etc. You often see this in the "body" tag. I think, it was "vlink= ...", "alink= ..." and so on. But I am not sure. I hate inline style and never use it. Dieter

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Re: [Zope] ZCatalog and LoginManager - be aware.
by Oliver Bleutgen 28 Nov '00

28 Nov '00

> Oliver Bleutgen wrote: >> I fiddled around somewhat and discovered that disabling >> subtransactions in ZCatalog does help (required for using >> ZSQL Methods and ZCatalog in the same transaction). > Yeah, that sux. I think this is a known limitation. I'm not sure. It is, unfortunately this is only mentioned under "status" in the ZCatalog interface. Well, I just got there by chance after several hours of digging around. I first thought perhaps some DTML-Document was "bad-behaving". (not that I had an idea how it might do that.) With a (assumed) growing attractiveness of things like sql-based UserFolders, perhaps a big warning sign either on the main page of these products or ZCatalog (better IMO, since this is a default product) would be in order, I guess. Or perhaps disabling subtransactions by default. All in all this combination seems not uncommon. >> Now I use SQL-based LoginManager, but why on earth did it only >> fail on DTML-Documents? Is it because I have much more of them so >> only then ZCatalog's subtransactions come into play? > Probably because sub transactions are only commited after a certain > number of words or values are indexed, and your DTML documents were the > only things that held words. > -Michel cheers, oliver

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Re: [Zope] External Methods
by Dieter Maurer 28 Nov '00

28 Nov '00

Kini Natekar writes: > How to call an External Method from another > External Method and pass parameters ? > I am just a beginner, so intricate details would > be appriciated. def Method1(self, ...further args...): ..... self.Method2(self, ...params for method2...) # or: Method2(self, ....), when "Method2" is in the same source .... def Method2(self, ...furhter args...): .... Dieter

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Re: [Zope] Instance within Instance
by Dieter Maurer 28 Nov '00

28 Nov '00

Daryl Stultz writes: > .... "REQUEST.set" to influence where instance is created .... "createInObjectManager" is uninterested in "REQUEST". It creates the new object (usually, exception when its object has a special "Destination" attribute) in the parent (aq_parent) of its object. Your "dtml-with" should place your "class1" instance correctly in the "parent position". I expect, that your "class1" does not inherit form "ObjectManager" and therefore does not have a "_setObject". In this case, "createInObjectManager" goes up another step (another "aq_parent") and reaches the folder containing the "class1" instance. It has a "_setObject", the "class2" instance is placed there, too. > Anymore info (or pointers to better docs) would be great. Thanks. You can learn about "aq_parent" in the acquisition documentation. Search "zope.org" for it (acquisition). Dieter

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Re: [Zope] AND operator and ZCatalog
by Dieter Maurer 28 Nov '00

28 Nov '00

Bak @ kedai writes: > i have a ZCatalog that indexes news. i use keyword index, and text index. > when i try > > <dtml-in "Catalog(publication=myPub,section=mySec,date_posted=myDate)"> > ..... > it seems that the search was ORed, not ANDed. > > i hope i'm clear enough. I tried it out: For me, it was definitely an AND. What I did: Make a search for "Meta Type=Document Template" => lots of hits. Add "Title=xxxx" to the search => no hits Add "Title=Elvis" => some hits as I would expect. Dieter

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ZCatalog and dates
by James Sintz 28 Nov '00

28 Nov '00

I have a ZCatalog set up to index a date field and a title field. When I do a search for meta_type "news" I get a tabular list back of all 18 cataloged items showing, among other things the date field (goLiveDate) and the title field. If I do a search for both meta_type of "news" a date of 2000/11/16 in the goLiveDate field the results page returns "There was no data matching this Catalog query". Yet when I do a search for the meta_type of "news" alone I see that indeed the Catalog contains 2 entries with 2000/11/16 in the goLiveDate field. Why doesn't it find any entries when I search by date? Jamey

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