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| srichter | are there still any catalog experts here? | 01:23 |
|---|---|---|
| srichter | J1m: can I ask you a index question again? | 01:32 |
| J1m | sure | 01:32 |
| srichter | let's say I have courses | 01:32 |
| srichter | which I grade | 01:32 |
| srichter | I now want to search for all students that received an A in mathematics? | 01:33 |
| srichter | what index would I need to use and how? | 01:33 |
| srichter | the thing is, of course, that the courses are not attributes | 01:33 |
| srichter | basically, I have a mapping/dictionary course -> grade and I want to find all students that have a particular course -> grade map | 01:34 |
| srichter | J1m: any idea? | 01:35 |
| srichter | I guess a topic index is what I want? | 01:36 |
| J1m | You could have a method that returns a list of course-grade pairs and index the result using a keyword index. | 01:37 |
| srichter | ahh, ok | 01:38 |
| J1m | So suppose that the course code for math is 42. Then you'd just do a keyword index search for the value ('=42, 'a') | 01:38 |
| J1m | So suppose that the course code for math is 42. Then you'd just do a keyword index search for the value (42, 'a') | 01:38 |
| srichter | but then I could not do a find all students that have a grade better than b in 42 | 01:39 |
| J1m | sure you could, if you do a range search. | 01:40 |
| srichter | how does that work, i.e. where can I read about that? | 01:41 |
| srichter | oh, so basically I would give my grades numbers too | 01:42 |
| J1m | Each index has it's own low-level "query language". You have to look at the documentation for each index, if there is any. :) | 01:42 |
| srichter | and then I can searcdh from (42, 3) [B] to (42, 4) [A]? | 01:42 |
| J1m | I'm not sure we even have a keyword index. :) | 01:42 |
| srichter | that's the problem, the documentation is only in the tests, which are not very extensive | 01:42 |
| J1m | I have no idea what that would mean. | 01:43 |
| srichter | we have a field index | 01:43 |
| J1m | You need a keyword index. | 01:43 |
| srichter | ah, we have that too | 01:43 |
| J1m | Because students take multiple courses. | 01:43 |
| srichter | right | 01:44 |
| srichter | ok, I think I see how the keyword index would work for me | 01:45 |
| srichter | thanks a lot | 01:46 |
| J1m | yw | 01:47 |
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| jukart | dobee: ayt ? | 15:44 |
| dobee | jukart: y | 15:45 |
| faassen | hm, anyone have an example of a generations script that changes the class of persistent objects? | 15:47 |
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| sashav | faassen: I know they have made something like that for schooltool | 16:37 |
| sashav | look for some kind of migration script/tool there | 16:38 |
| faassen | sashav: ah, okay, I'll take a look at that, thanks. | 16:39 |
| faassen | sashav: I'm solving it by recreating the new classes now, that ought to work. | 16:39 |
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| sashav | stefan said that they had walked through the whole zodb and changed classes on persistent objects | 16:40 |
| mgedmin | faassen: that's a very hard problem | 16:47 |
| mgedmin | I tried to solve it once, then gaveup | 16:47 |
| mgedmin | stefan solved a similar but easier problem: changing the location/name of a class | 16:47 |
| mgedmin | you need to be able to import the old class with the old name to do that | 16:47 |
| mgedmin | if you want to change the class of a single persistent object (rather than *all* instances of a particular class) | 16:48 |
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| mgedmin | you also need to hunt down *all* the references to that object | 16:48 |
| mgedmin | and mark the persistent objects that have those references as changed | 16:48 |
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| faassen | mgedmin: okay, that sucks, I'm just going to replace them. | 16:57 |
| mgedmin | yeah, in ZODB every reference to a persistent object explicitly stores the object's class in addition to OID | 16:59 |
| faassen | mgedmin: yeah, I found that out. | 16:59 |
| sashav | how do I use a view from a dtml file? | 17:03 |
| faassen | mgedmin: argh, things depend on person instances in the ZODB, so that isn't so easy either. :) | 17:03 |
| faassen | mgedmin: File "/home/faassen/working/schooltool/schooltool/Zope3/src/zope/app/container/dependency.py", line 45, in CheckDependency | 17:04 |
| faassen | raise DependencyError(Message(exception_msg, mapping=mapping)) | 17:04 |
| faassen | DependencyError: | 17:04 |
| faassen | Removal of object (${object}) which has dependents (${dependents}) | 17:04 |
| faassen | is not possible ! | 17:04 |
| faassen | sashav: never tried that from DTML | 17:04 |
| faassen | very helpful error message, that. :) | 17:04 |
| faassen | mgedmin: so maybe using annotations *is* better. :) | 17:05 |
| * mgedmin wonders why anyone would want to use DTML | 17:05 | |
| mgedmin | faassen: if you have a debugger, you can try to zope.i18n.translate(that_message) | 17:06 |
| sashav | mgedmin: generate js | 17:06 |
| faassen | mgedmin: weird that it only shows up on the console and not through the UI | 17:06 |
| mgedmin | faassen: is that a generation script? | 17:07 |
| faassen | mgedmin: yes. | 17:13 |
| faassen | mgedmin: I guess that causes it. | 17:13 |
| faassen | mgedmin: I don't know much about the dependency system in use. | 17:13 |
| mgedmin | faassen: I've just refreshed my memory | 17:20 |
| mgedmin | faassen: let's talk about that on #schooltool after the meeting | 17:20 |
| faassen | mgedmin: okay, thanks. :) | 17:22 |
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| faassen | the '' path is a reference to the root, right? | 18:18 |
| regebro | ('',) should be root. | 18:18 |
| regebro | Or '/'. | 18:18 |
| regebro | Unless this has changed in Z3, but that would be bad. | 18:19 |
| regebro | I guess '' would probably end up returning whatever you traverse from... which often is the root. :) | 18:21 |
| faassen | yeah, tracing some bug. | 18:21 |
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| gnosis | can anyone point me to an example of setting up a join form with pau? | 18:32 |
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