- Zope - Zope lists

Re: [Zope] zope.schema: association vs. containment in Object, List
by Sean Upton 07 Jun '08

07 Jun '08

On Fri, Jun 6, 2008 at 7:24 AM, Fred Drake <fdrake(a)gmail.com> wrote: > Still another approach, if you're looking to create software support > and the first isn't suitable, is to use fields that provide additional > interfaces that indicate the nature of the references. My application (and I suspect other cases will) need to do just this; a marker on the field eliminates the ambiguity. Schema and interfaces should allow for complete "domain modeling" in such a way that expresses intent of the business case, regardless of the persistence mechanism or implementation details underneath, so I think I'll continue to use custom field types marked with an IRelationshipField interface, and assume the built-in Object, List fields are only used for containment. The only thing I do not like about my direction is that it leaves ambiguity when working with code from other components/projects that do not share this assumption. For RDBMS persistence of schema-defined content, z3c.dobbin (for example) assumes Object fields are just foreign-key relationships, but the downside to this simplification is an inability to meaningfully interact with a simple persisted containment scenario (a complex object that has contained specialized child objects intrinsically part of the primary object; trying to serialize to JSON with clear recursion boundaries for example, would be difficult). In my application-case, I'm looking to do something similar, but hoping to do so with a clear bright-line between associations and containment. Note: removal of such ambiguity is helpful for the possible use case of schema/interface bootstrapping/generation from UML tools for model-driven-design. Sean

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Support for Charity Challenge events
by Brian Sullivan 06 Jun '08

06 Jun '08

Has anybody ever heard of Zope or other open source software to support charity challenge events (runs, bikeathons, skip rope, lose weight, cut hair -- well you know what i mean)?

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Re: [Zope] zope.schema: association vs. containment in Object, List
by Fred Drake 06 Jun '08

06 Jun '08

On Fri, Jun 6, 2008 at 4:54 AM, Sean Upton <sdupton(a)gmail.com> wrote: > I want to be able to spell out certain zope.schema.Object fields in my > interfaces as "contained" while other fields are declared as Are you using a source or vocabulary? If so, this could be part of the nature of the values returned from that. A particular source would provide either objects to be contained, or references (not contained). Another reasonable approach (IMO) would be to simply document the containment/reference relationship in the field's description text or in a comment alongside the field. Still another approach, if you're looking to create software support and the first isn't suitable, is to use fields that provide additional interfaces that indicate the nature of the references. -Fred -- Fred L. Drake, Jr. <fdrake at gmail.com> "Chaos is the score upon which reality is written." --Henry Miller

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zope.schema: association vs. containment in Object, List
by Sean Upton 06 Jun '08

06 Jun '08

All, I want to be able to spell out certain zope.schema.Object fields in my interfaces as "contained" while other fields are declared as associated/related objects. I'm interested in describing this in the interface itself, and not leave such intrinsic characteristics to the implementation class. It is useful, in my experience to have the ability for utility components to know this about a field (for example, relational database deletion cascades, JSON serialization of an object and its contained objects, neglecting related objects, or you might end up serializing the entire graph). Are there any community best practices for doing this? My previous attempts at doing this have been to subclass List and Object for OneToMany and OneToOne field types respectively, and treat original Object and List(value_type=Object()) fields as always implying containment. Is this reasonable? Are there other or better approaches? Thanks, Sean

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Counting the elements of a result in a ZCatalog
by Marco Bizzarri 05 Jun '08

05 Jun '08

Hi all. I need to query a ZCatalog, and I would like to know how many elements are there. I'm working from inside a python product, so, I could do something like: results = Catalog(criteria) return len(results) But this creates a number of objects which are completly useless for me. After all, I'm interested in just the length, not in the objects. I could do something like this: results = Catalog(criteria, sort_limit=1) return results.actual_result_count since I should have a LazyMap, which does not (should not) actually load all the objects (at least, I hope so). This does not work if I have no result. So, what I should do would be: results = Catalog(criteria, sort_limit=1) if len(results) == 0: return 0 return results.actual_result_count Am I missing something? Regards Marco -- Marco Bizzarri http://iliveinpisa.blogspot.com/

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Multithreading sessions
by Jon Emmons 04 Jun '08

04 Jun '08

Dear Zope Users group, I am running zope 2.9.4 and have observed that it will not simultaneously serve pages to my users. For Example: User 1 requests data that takes the MySQL server 30 seconds to retrieve Meanwhile. User 2 wants to log on User 2 will not be served the logon page until user 1's query has finished. Is this typical Zope behavior? How do I get Zope to serve pages, run python scripts, etc. to multiple users simultaneously? Thanks, Jon Emmons

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index error, list index out of range
by suhail shaik 04 Jun '08

04 Jun '08

some one please help me regarding why the index error is occuring... i find the application works fine for a few values of textidx but only for a few distinct values this error occurs.... kindly help me Traceback (innermost last): - Module ZPublisher.Publish, line 119, in publish - Module ZPublisher.mapply, line 88, in mapply - Module ZPublisher.Publish, line 42, in call_object - Module Shared.DC.Scripts.Bindings, line 313, in __call__ - Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec - Module Products.PageTemplates.ZopePageTemplate, line 330, in _exec - Module Products.PageTemplates.ZopePageTemplate, line 426, in pt_render - Module Products.PageTemplates.PageTemplate, line 89, in pt_render - Module zope.pagetemplate.pagetemplate, line 117, in pt_render - Module zope.tal.talinterpreter, line 271, in __call__ - Module zope.tal.talinterpreter, line 346, in interpret - Module zope.tal.talinterpreter, line 824, in do_loop_tal - Module zope.tal.talinterpreter, line 346, in interpret - Module zope.tal.talinterpreter, line 536, in do_optTag_tal - Module zope.tal.talinterpreter, line 521, in do_optTag - Module zope.tal.talinterpreter, line 516, in no_tag - Module zope.tal.talinterpreter, line 346, in interpret - Module zope.tal.talinterpreter, line 590, in do_setGlobal_tal - Module zope.tales.tales, line 696, in evaluate *URL: /news/SearchReport* *Line 79, Column 2* *Expression: <PythonExpr container.data.restrictedTraverse(storynb[0]).getChapterInfo(storynb[1], kfMax)>* *Names:* {'container': <Folder at /news>, 'context': <Folder at /news>, 'default': <object object at 0xb7d62528>, 'here': <Folder at /news>, 'loop': {u'result': <Products.PageTemplates.Expressions.PathIterator object at 0x1993cfcc>}, 'nothing': None, 'options': {'args': ()}, 'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x186ab80c>, 'request': <HTTPRequest, URL=http://kmi-vid01.open.ac.uk:8080/news/SearchReport>, 'root': <Application at >, 'template': <ZopePageTemplate at /news/SearchReport>, 'traverse_subpath': [], 'user': <User 'mmis'>} - Module Products.PageTemplates.ZRPythonExpr, line 49, in __call__ __traceback_info__: container.data.restrictedTraverse(storynb[0]).getChapterInfo(storynb[1], kfMax) - Module PythonExpr, line 1, in <expression> - Module Shared.DC.Scripts.Bindings, line 313, in __call__ - Module Shared.DC.Scripts.Bindings, line 350, in _bindAndExec - Module Products.PythonScripts.PythonScript, line 327, in _exec - Module None, line 26, in getChapterInfo *<PythonScript at /news/getChapterInfo used for /news/data/20071124>* *Line 26* - Module AccessControl.ZopeGuards, line 67, in guarded_getitem IndexError: list index out of range

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re: help required in [result.data_record_id_]
by suhail shaik 04 Jun '08

04 Jun '08

Hi, I am a novice in zope. i have to debug a program where i get the key value error, traversal error. a lil info from the error log. "Module Products.PageTemplates.ZRPythonExpr, line 49, in __call__ - __traceback_info__: here.getStoryNumber(here.catalog.data.getobject(result.data_record_id_, REQUEST=None).getId()) Module PythonExpr, line 1, in <expression> Module Products.ZCatalog.ZCatalog, line 590, in getobject Module OFS.Traversable, line 284, in unrestrictedTraverse - __traceback_info__: (['20071122_9.txt', 'stories', 'text'], '20071122') KeyError: '20071122'" i am unable to understand why this error is occuring . at the expression. <PythonExpr here.getStoryNumber(here.catalog.data.getobject(result.data_record_id_, REQUEST=None).getId())> i would be happy if some one could give me a sense of direction and give a brief idea where the error could have occured and how i should approach. thanks in advance. suhail

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statistics and click analysis for a plone site
by robert rottermann 03 Jun '08

03 Jun '08

Hi there, for a Client using a plone2 intranet (with no access from the outside world) I installed awstat to track the usage of the intranet. now I wonder how meningfull such statisics are. The intranet usage is roughly as follows: - user logs into the intranet authenticating against a Ldap/MSActiveDirectory - she stays in the intranet all day, probably never logs out - collects data as needed The awstats setup is very basic. I just installed it and adopted the config files such that it finds the apache log files. I did a second setup for the Z2.log (to get at the old data, as we do not rotate the Z2.log). Looking at the awstats statistics I do not find them of overwhelming informative. Now, I now awstats is not a click analysis tool. but maybe somebody has done some more analysis into how to provide useful statistics on the usage of an intranet. Any pointers would be welcome. thanks robert

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Reinventing a proxy wheel?
by Gaute Amundsen 03 Jun '08

03 Jun '08

Hi. I think I may just have reinvented a kind of cgi-proxy for authentication purposes. Seems to work nicely so far, but oh, so ugly. Thus I would be gratefull for any pointers towards some more enlightened solution. Problem to solve: External php based facility needs to be made available to logged in zope users only, but have no built in mechanism to to handle "everyone must log in to see anything at all" situations. Some users can be synced by way of sql, but many can not. This is a given. My solution so far: An external method that wraps wget. Rearanges the url to connect via 127.0.0.1, and use original host as host header. Use Apache to close access to everyone but 127.0.0.1. Rest of the script basically shuffles headers back and forth from zope to wget, and back. and the script can of course be subject to normal zope access checks. If no major flaws with this approach appears, I will of course replace wget with urllib, and perhaps even productify the thing, but before I do that I have this nagging feeling of reinventing the wheel that I need to address... Regards Gaute Amundsen

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