May 2006 - Zope - Zope lists

Re: [Zope] Re: Questions on ZODB BTrees versus bsddb BTrees
by Terry Jones 05 May '06

05 May '06

Hi Simon >>>>> "Simon" == Simon Pamies <s.pamies(a)banality.de> writes: Last year I Simon> hacked some ZCatalog replacement because I had a non-zope standalone Simon> ZODB application. It is only one single file containing a complete Simon> customizable indexer. Perhaps it is also useable here. Simon> http://files.banality.de/public/standaloneindexer.py I grabbed it, and will have a look soon. Thanks. Terry

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Re: [Zope] Questions on ZODB BTrees versus bsddb BTrees
by Terry Jones 05 May '06

05 May '06

>>>>> "Chris" == Chris Withers <chris(a)simplistix.co.uk> writes: Chris> Terry Jones wrote: >> Usually you find database records by means of the record's key. >> However, the key that you use for your record will not always contain >> the information required to provide you with rapid access to the data >> that you want to retrieve. Chris> Ah, okay, you do this with multiple BTrees in Zope, unless you want Chris> to swallow the whole ZCatalog... I think I'll roll my own, at least for now. I don't want to use ZCatalog for the indexing part, at least not yet. The BaseIndex class in src/zope/app/catalog/README.txt of the Zope3 SVN tree illustrates pretty much all I need right now. See, I'm still relying on reading the docs :-) | >> For example, suppose your database contains | >> records related to users. The key might be a string that is some unique | >> identifier for the person, such as a user ID. | | Chris> from BTrees.IOBTree import IOBTree | Chris> chris = object() | | Chris> id2user = IOBTree() | Chris> id2user[1234] = chris | | >> is, by the information stored in the key), it may also on occasion want | >> to location people by, say, their name. | | Chris> from BTrees.OOBTree import OOBTree, OOSet | Chris> name2user = OOBTree() | Chris> name2user['chris'] = chris | | Chris> Now, if you have more than one value, you use a set: | | Chris> dan = object() | Chris> age2user = OOBTree() | Chris> age2user[27] = OOSet(chris,dan) Thanks for the code too. Terry

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Re: [Zope] Questions on ZODB BTrees versus bsddb BTrees
by Terry Jones 05 May '06

05 May '06

Hi Chris >>>>> "Chris" == Chris Withers <chris(a)simplistix.co.uk> writes: You may Chris> have more joy with these questions on the zodb-dev(a)zope.org mailing Chris> list... Thanks, I've re-sent. Thanks for the other comments & pointers too. Regards Terry. >> - ZODB BTrees do not allow you to set up secondary keys (a la bsddb). Chris> Dunno what that means. I think you're just use two BTrees for this... [Sorry if the following is off-topic for the list. It's presumably good for the archives, and, I suppose, is the end of the thread.] >From the Berkeley DB docs: Usually you find database records by means of the record's key. However, the key that you use for your record will not always contain the information required to provide you with rapid access to the data that you want to retrieve. For example, suppose your database contains records related to users. The key might be a string that is some unique identifier for the person, such as a user ID. Each record's data, however, would likely contain a complex object containing details about people such as names, addresses, phone numbers, and so forth. While your application may frequently want to query a person by user ID (that is, by the information stored in the key), it may also on occasion want to location people by, say, their name. Rather than iterate through all of the records in your database, examining each in turn for a given person's name, you create indexes based on names and then just search that index for the name that you want. You can do this using secondary databases. In DB, the database that contains your data is called a primary database. A database that provides an alternative set of keys to access that data is called a secondary database. In a secondary database, the keys are your alternative (or secondary) index, and the data corresponds to a primary record's key.

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default_zpublisher_encoding not supported
by MIlos Prudek 05 May '06

05 May '06

Zope 2.8.6 is supposed to support default_zpublisher_encoding in zope.conf. But when I uncomment the example in zope.conf, default_zpublisher_encoding utf-8 I cannot launch Zope: Error: 'default_zpublisher_encoding' is not a known key name (line 863 in file:///home/makina/bili/etc/zope.conf) -- Milos Prudek

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Re: [Zope] Questions on ZODB BTrees versus bsddb BTrees
by Terry Jones 05 May '06

05 May '06

>>>>> "Chris" == Chris Withers <chris(a)simplistix.co.uk> writes: Chris> ZCatalog ships as a standard part of Zope, no need to download. Chris> It's covered extensively in the zope book on Plope.org... Chris> Not everything is as hard as some people manage to make it ;-) OK, thanks. I hope you'll agree though that the three excerpts below from http://www.zope.org/Documentation/How-To/ZCatalogTutorial do give the clear impression that ZCatalog is available as a separate standalone entity and is available somewhere as ZCatalog-x-x.tgz for download. | * Usable outside of Zope. The software is broken into a Python Catalog | which wrapped by a ZCatalog. The Python Catalog can be used in any | Python program; all it requires is the Z object database and the | indexing machinery from Zope. | * The ZCatalog is a free, Open Source part of the Zope software | repository and thus is covered under the same license as Zope. It is | being developed in conjunction with the Zope Portal Toolkit | effort. However, the ZCatalog product is managed as its own module in | CVS. | Installing ZCatalog | | ZCatalog can be downloaded from the Zope download area and is also a | module in the public CVS for Zope. Untar it while in the root directory | of your Zope installation: | | $ cd Zope-2.0.0a3-src/ | $ tar xzf ../ZCatalog-x.x.tgz Or, do you really want to shoot the messenger? :-) BTW, I did see the ZCatalog stuff in the Zope2 tarball, but I assumed that was the Zope Product, not the implied standalone. Anyway, I'll get on with it. Thanks. Terry

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CMS question - Compound Doc
by Aaron Siegel 05 May '06

05 May '06

Hello I am an web administer for a very non-profit organization. We where looking in to hiring someone to develop a CMS for us, We received a proposal from a company that develops their sites using Compound Doc. I just found out today that they will be signing the papers on Tuesday, I am a little nervous. Does anyone have any experience using Compound Doc? Thank you Aaorn

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RE: [Zope] how to decode base64 in DTML?
by Andreas Jung 05 May '06

05 May '06

--On 4. Mai 2006 22:22:25 +0200 Jaroslav Lukesh <lukesh(a)seznam.cz> wrote: > > import cStringIO > import mimetools > from Products.PythonScripts.Utility import allow_module > allow_module("base64") > > Please read carefully. The documentation tells you to put allow_module() inside somewhere in Products/YOUR_PRODUCT/__init__.py but not inside the PythonScript itself. -aj -- ZOPYX Ltd. & Co. KG - Charlottenstr. 37/1 - 72070 Tübingen - Germany Web: www.zopyx.com - Email: info(a)zopyx.com - Phone +49 - 7071 - 793376 E-Publishing, Python, Zope & Plone development, Consulting

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Re: [Zope] Questions on ZODB BTrees versus bsddb BTrees
by Terry Jones 05 May '06

05 May '06

[Following up on my original posting, with a summary of resolution.] Thanks for the help & pointers to ZCatalog. I actually did find a standalone version of ZCatalog, created by Kevin Dangoor, at http://www.blazingthings.com/dev/zcatalog.html His pulls code out of Zope3, and rewrites some of it. Kevin's code and one example each requires one trivial change to work on the current Zope3 SVN version (email me if you need these). I read the plope chapter on ZCatalog, but its emphasis is on getting at ZCatalog from zope, whereas I want to do everything from python, with no zope instance. Meanwhile, I had decided that my option #3 | 3. Redesign what I'm doing so as to only need ZODB BTrees. This is quite | far from optimal (in terms of space and time), but might be the | quickest to implement. | | However, this may not solve the problem. If a fundamental need is to | (e.g.) find all values >= X, where duplicates are allowed but you're | using trees that do not allow duplicate keys, this is difficult. Hence | the question about byValue(). actually wasn't too hard, and that I should simply store values as keys and let values be a list of objects that had that value. (I hope that makes sense) Then, finally reading the Zope3 src/zope/app/catalog/README.txt I saw that that is basically what ZCatalog already does (except with a BTrees.IFBTree.IFTreeSet not a list), as well as adding indexing. That solution wastes space, as values are stored twice. How much of a waste depends on the multiplicity of value values, but it could about a 2x waste (i.e., when all values are distinct and their size is large compared to the size of an docid). And there's more pickling, and more traffic to the storage. But.... that's life I guess. I'd rather the simpler, easier solution that lies wholly within ZODB/ZEO and which lets me have just a single transaction and recovery type to worry about than to hack a hybrid ZODB/bsddb just to save space and have to deal with those issues in a robust way. So that's it, problem solved. Thanks again for the pointer to ZCatalog. Terry

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how to decode base64 in DTML?
by Jaroslav Lukesh 04 May '06

04 May '06

Hi all, Would you like to help me with decoding base64 string, please? I was try many ways (*), but no with success, but import cStringIO import mimetools import binascii binascii.a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n') in commandline python works OK. (*)here are some examples: <dtml-var "_.base64.decode('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_base64.decode('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "base64.decode('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "'YWxla2liYW5nb0B6dWcuY3o=\n'.base64.decode()"> <dtml-var "mimetools.base64.decode('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_mimetools.base64.decode('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_.mimetools.base64.decode('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_.base64.decodestring('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "mimetools.base64.decodestring('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_mimetools.base64.decodestring('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_.mimetools.base64.decodestring('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_.binascii.a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_binascii.a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "binascii.a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_.a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "_a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "a2b_base64('YWxla2liYW5nb0B6dWcuY3o=\n')"> <dtml-var "'YWxla2liYW5nb0B6dWcuY3o=\n'.binascii.a2b_base64()"> <dtml-var "'YWxla2liYW5nb0B6dWcuY3o=\n'.a2b_base64()"> <dtml-var "_.binascii('YWxla2liYW5nb0B6dWcuY3o=\n').a2b_base64()"> <dtml-var "_binascii('YWxla2liYW5nb0B6dWcuY3o=\n').a2b_base64()"> <dtml-var "binascii('YWxla2liYW5nb0B6dWcuY3o=\n').a2b_base64()"> Many thanks for your help, JL.

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about restricting addable types in Plone
by Sergio Gomez 04 May '06

04 May '06

Hi all, I am working with Plone 2.1.2, Zope 2.8.6 and python 2.3.5. I would like to know if there is a way to restrict addable types to a folderish object programmatically. What I need is to allow adding a certain type of items and not otheres depending on the value of one field in my folderish object. For example, if the value of the field is "0", I can only add "News Item", if the value is "1", I can only add "File", and so on. Thanks! Sergio

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