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| jodok | Theuni: ping | 00:27 |
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| pcardune | srichter: ping | 02:34 |
| pcardune | projekt01: ping | 02:36 |
| projekt01 | pcardune, yup | 02:41 |
| pcardune | projekt01: regarding your email, the fullName required object was necessary so that the fullName would be passed to the constructor of JSButtonAction, which is how ButtonAction gets constructed as well | 02:42 |
| pcardune | that is why I put it in there, although I do agree that a string for a required object doesn't make sense | 02:42 |
| projekt01 | ouch | 02:42 |
| pcardune | do you know if srichter was talking about making form and context required objects for all IFieldWidget adapters? or just for my specific case of buttonAction adaptation? | 02:43 |
| pcardune | I think the former would be really cool | 02:43 |
| projekt01 | pcardune, then we should write a adapter factory which does the name handling, but I'm not sure because I didn't look at the code. | 02:43 |
| pcardune | projekt01: an adapter factory? how would that work? | 02:44 |
| projekt01 | pcardune, is your sandbox working? | 02:44 |
| pcardune | tests don't pass yet | 02:45 |
| projekt01 | a factory is a method which lets you define a adapter call, this factory knows the name (string). This factory is registered as adapter. | 02:45 |
| projekt01 | this means the (method) adapter is a hook which dispatches the adapter call and calls the constructor of the button. | 02:46 |
| pcardune | but how does the factory know the name? | 02:46 |
| pcardune | ooh | 02:46 |
| projekt01 | hardcoded | 02:46 |
| pcardune | i think I understand | 02:46 |
| projekt01 | the adapter call in the form doesn't know and use the name, you can delegate this into the adapter factory. | 02:47 |
| projekt01 | But I'm really not sure if this will fit for you uscase. It's just a patter which can be used for adapters. | 02:48 |
| pcardune | that would be similar to setting the name after construction? | 02:49 |
| projekt01 | pcardune, is it in the zobby sandbox? | 02:49 |
| projekt01 | yes, if this is possible, its better to set a attribute later | 02:50 |
| pcardune | projekt01: are you looking for my use case or for my modification to z3c.form? | 02:50 |
| pcardune | z3c.formjs is in http://svn.zope.org/Sandbox/pcardune/z3cFormJS/trunk/ | 02:51 |
| projekt01 | both | 02:51 |
| pcardune | the modification to z3c.form is in http://svn.zope.org/z3c.form/branches/pcardune-tweaks/ | 02:52 |
| projekt01 | Do you hava a working trunk somewhere or do I have to move the package to a own working zope3 | 02:52 |
| pcardune | I do not have my own working trunk | 02:52 |
| projekt01 | is the zobby trunk working? | 02:53 |
| pcardune | as far as I remember yes | 02:53 |
| pcardune | but it does not include any of that stuff | 02:53 |
| pcardune | as soon as I start developing demos, i'll have a working trunk | 02:53 |
| projekt01 | cool | 02:54 |
| pcardune | unfortunately, the name can't be set later because it is used right away in __init__ to construct the Action object | 02:54 |
| pcardune | in any case, setting the name afterwords would seem very bad form | 02:55 |
| projekt01 | can we change the __init__? | 02:55 |
| pcardune | actually, it wouldn't be so bad | 02:55 |
| pcardune | because the Action.__init__ doesn't do anything interesting to the name, although it will generate one if it gets None | 02:56 |
| projekt01 | Yes, yo can set None and later set the name, right? | 02:58 |
| pcardune | yes | 02:58 |
| pcardune | in fact, the name defaults to None | 02:58 |
| projekt01 | yes, and set the name later, will override the title as name which get used if name=None | 02:59 |
| pcardune | but I'm still not clear on where this overriding is supposed to happen | 03:00 |
| pcardune | If i understand correct, there is a function that adapts request, button to IFieldWidget | 03:00 |
| pcardune | the function creates the custom ButtonAction implementation and sets the name | 03:01 |
| pcardune | but how does it know the name? | 03:01 |
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| projekt01 | I'm lookin at line 231 in field.py that's what we should do for the button action. | 03:01 |
| pcardune | ok, that is what I was originally thinking | 03:02 |
| pcardune | I thought you were talking about something more complicated | 03:02 |
| projekt01 | and why not support a actionFactory attribute for IButton | 03:02 |
| pcardune | to allow for more specific customization? | 03:04 |
| projekt01 | for custom widget, we offer a widgetFactory attribute which allows you to define custom widget classes at a class level in the form. | 03:05 |
| projekt01 | e.g. fields['foo'].widgetFactory = FooWidget | 03:05 |
| pcardune | I like this idea | 03:06 |
| projekt01 | But i'm a little bit lost right now. What was the usecase for your changes? | 03:06 |
| pcardune | sounds good, I'll make those changes | 03:06 |
| pcardune | well, I wanted to create my own javascript buttons but use them in the same way as the regular buttons | 03:07 |
| pcardune | including putting them in the same buttons container | 03:07 |
| pcardune | and it just made sense to put them in the same actions container as the rest of the buttons | 03:08 |
| projekt01 | are you looking for a way taht your custom button get used instead of the original button? | 03:08 |
| pcardune | right | 03:08 |
| projekt01 | Ah, cool, this measn you can use existing forms and apply javascript buttons later. | 03:09 |
| projekt01 | Argh, I can't type today | 03:09 |
| pcardune | yes | 03:10 |
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| ZopeIn | Could anyone give me a hint how to add an object into a folder which happens to be an attribute of another object? I have this forbiddenAttribute error when I try self.context.anAttribute[name]=obj | 04:23 |
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| pcardune | ZopeIn: it is probably security proxied | 04:25 |
| pcardune | try using the removeSecuriyProxy function as in removeSecurityProxy(self.context).anAttribute[name] | 04:26 |
| ZopeIn | but removeSecurityProxy does not solve the problem either | 04:26 |
| pcardune | is the attribute defined in the interface the view is for/ | 04:27 |
| pcardune | ? | 04:27 |
| pcardune | I think a browser view can only access those attributes defined in the interface which the view is registered for | 04:28 |
| pcardune | I'm not positive though | 04:28 |
| ZopeIn | alright, removeSecurityProxy worked, thanks a lot, buddy | 04:28 |
| pcardune | no problem | 04:28 |
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| projekt01 | pcardune, it's important the you locate the attribute if it's a object or a container. | 04:36 |
| projekt01 | you can do this with the locate method like: | 04:37 |
| projekt01 | zope.location.locate(subobject, self, u'the name') | 04:37 |
| projekt01 | and don't forget to fire the object created event if you add a object in a __init__ method as a attribute | 04:38 |
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| tjs | I have an annotation that has an attribute 'reminders' that is a PersistentList that defaults to ['email'] | 09:00 |
| tjs | in the interface this is a schema.Choice with a SimpleVocabulary | 09:01 |
| tjs | and in the view I use a MultiCheckBoxWidget to render it | 09:01 |
| tjs | everything is fine, it renders, I can update the options | 09:01 |
| tjs | except if I unselect everything | 09:02 |
| tjs | then I get a type error | 09:02 |
| tjs | seems pretty flakey | 09:02 |
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| romanofski | moin | 09:54 |
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| dobee | test | 12:09 |
| timte | works :) | 12:11 |
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| malthe_ | nikhil_n: Ran 144 tests with 0 failures and 0 errors in 16.296 seconds. | 12:18 |
| nikhil_n | that means its ok in python2.5 now | 12:19 |
| nikhil_n | i also tried for making it working in both versions | 12:20 |
| nikhil_n | when i ran tests its working in both versions | 12:21 |
| nikhil_n | malthe , thanks helping | 12:22 |
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| xbeanx | What is the difference between a BrowserPage and a BrowserView ? | 18:33 |
| xbeanx | Is a BrowserView supposed to be a view of an object? | 18:33 |
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| dennis_ | xbeanx a page is a complete page, which you can access with a browser. A view is something which does not have to be a whole page, and which you can only reference from inside other views, pages or viewlets, like the loginlogout view, which presents a login link and username, but is not its own page | 18:38 |
| dennis_ | thats as far as I understand it | 18:38 |
| xbeanx | dennis_: makes sense... I was totally off course on that one.. | 18:39 |
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| ctp | hi folks. i am relatively new to zope+plone. i have put a navtree.py and an overrides.zcml into an existing product (LinguaPlone) to extend Plone's navtree functionality, but it seems that they're not loaded properly. should the overrides.zcml be loaded automagically restarting zope or have i to modify some other existing files? | 18:52 |
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| Cripps | I have a *site* implemented, but when I create an instance of the site, I don't have the add menu in the ZMI ... what is the most likely thing that I'm missing? | 19:09 |
| Cripps | gosh, that question wasn't very clear at all ... | 19:09 |
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| Cripps | I have a site whose interface extends IPossibleSite and IContainer (as per Phil's book), and the Container is turned into a site on instantiation, I would like to use the ZMI to add components to the site, but there is no add menu on the left of the ZMI under the site ... so, I know I'm missing something, I just don't know what (since Folder does have the Add menu after Turning a Folder instance into a site). | 19:11 |
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| Cripps | so essentially, what I'm asking is: how do I ensure that a (sub)site retains the Add menu from the ZMI. | 19:23 |
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| norro | Cripps by implementing adequat container and contained interfaces to the objects? | 19:40 |
| Cripps | norro: I've got contained in my Site interface, I can try adding container to another component and see if that works ... I thought that contains and container just constrained the type of objects you could put into a container though ... | 19:42 |
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| Cripps | norro: no, that isn't working. :/ | 19:47 |
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| norro | hmmm, months ago i did that stuff, so I'm really not sure. Unfortunately I can't have a look at the sources right now | 19:49 |
| Cripps | norro: that's ok. Thanks for the attempt :) | 19:49 |
| norro | I based it on srichters book as far as i can remember | 19:50 |
| norro | np :) | 19:50 |
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| Cripps | I'm doing mine on phil's book ;) | 19:50 |
| Cripps | *based on phil's book | 19:50 |
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| Cripps | philiKON: are you around? | 20:24 |
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| ccomb | Hi, is there a way to know why a security proxy forbids some access ? | 22:55 |
| pcardune_lunch | ccomb: no not really... at least it's not easy | 22:56 |
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| pcardune_lunch | ccomb: but if you find out how, let me know | 22:56 |
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| J1m | A forbidden error is *always* caused by a lack of a declaration for an attribute. | 22:56 |
| J1m | You just need to look at the declarations for the object you get the forbidden error for. | 22:57 |
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| ccomb | J1m: That's what I'm searching for 1 hour | 23:00 |
| J1m | What does the exception say? | 23:00 |
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| ccomb | I'm trying to write an object attribute in a IObjectModifiedEvent | 23:01 |
| ccomb | The exact same action works in the IObjectAddedEvent | 23:01 |
| ccomb | the attribute is part of the object interface and is zcml declared with set_schema | 23:02 |
| J1m | Where did you get the IObjectModified event? Is this in a subscriber? | 23:02 |
| ccomb | I get the error in the subscriber | 23:02 |
| ccomb | The odd thing is I can write an attribute which is part of a upper interface, but not the one of the objects interface | 23:03 |
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| J1m | May I see the exception? | 23:04 |
| * ccomb pasting | 23:05 | |
| Theuni | Hey J1m | 23:06 |
| Theuni | What's your notion of ZODB's ACID compatibility? | 23:07 |
| ccomb | J1m : http://pastebin.ca/579717 | 23:07 |
| ccomb | Is zope.interface.Attribute taken into account with set_schema declaration ? | 23:11 |
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| ccomb | I've added a set_attributes declaration and it works but.... | 23:17 |
| ccomb | without this declaration I was able to write this attribute from the IObjectAddedEvent subscriber | 23:17 |
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| J1m | Theuni, I consider ZODB to have the ACID properties. | 23:24 |
| J1m | ccomb, set_schema only looks at fields. | 23:24 |
| ccomb | so why was I able to modify the attribute in the IObjectAddedEvent subscriber? | 23:25 |
| pcardune | ccomb: was it not security proxied? | 23:25 |
| ccomb | yes it was | 23:25 |
| J1m | ccomb, because the IObjectAddedEvent has an unproxied object and IObjectModifiedEvent has a proxied object. | 23:26 |
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| J1m | It's not clear to me why an object added event should have an unproxied object. | 23:26 |
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| ccomb | ah, I've just check it's true, it's not proxied in the add event | 23:28 |
| ccomb | So one can do what we want in such a subscriber ? | 23:29 |
| J1m | Like I said, it's not clear that an add event should have unproxied data. | 23:29 |
| J1m | If you're writing trusted code, you can do what you want in any case. After all, there's an API for removing security proxies. | 23:30 |
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| ccomb | It's assumed that if the principal has the permission to add the object, he can write anything on it ? | 23:30 |
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| ccomb | actually I don't see any reason why it should behave in a different manner from a modify event | 23:32 |
| J1m | The security system tries to help you by restricting what you can do based on authorizationa nd protections settings. If you find it's getting in your way and you want to be responsible for secure decisions yourself, then you can bypass the system, or use a "less restrictive" system like Grok's, which is actually more appropriate for many apps. | 23:32 |
| Theuni | J1m: K. I'm arguing with Dieter on a German list right now that we can safely call it ACID compatible, although there is some weirdness in the ACID versus ANSI isolation levels going on and there is an easy way to provoke `write skews`. | 23:36 |
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| J1m | I don't know what you are referring to. Can you be more specific? | 23:37 |
| Theuni | However, I compared our ACIDness (ACIDity?) to oracle, ms sql, postgres and mysql and they have exactly the same problems and call themselve ACID compatible. | 23:37 |
| Theuni | J1m: MVCC only implements "Snapshot isolation" which is not in all cases serializable | 23:37 |
| Theuni | An easy way to provoke this: | 23:37 |
| Theuni | Have one object A that references object B | 23:38 |
| Theuni | Then (roughly) in transaction 1 you remove the reference from A to B. In Transaction 2 you update object B. This would give different results if the transactions were executed serialized than when run in parallel. | 23:38 |
| Theuni | AFAICT that's called a `write skew`. | 23:38 |
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| Theuni | Dieter pointed out that a long outstanding bug in some catalog indexes caused quite some inconsistencies for them that way. | 23:39 |
| Theuni | Relational databases use "SELECT FOR UPDATE" to elevate read accesses to write accesses to allow conflict detection on values that were only read but used for a computational basis for values that were updated. | 23:40 |
| Theuni | This is a work around for MVCC not detecting those conflicts. | 23:40 |
| Theuni | I imagine ZODB *could* detect those conflicts but I'm not sure there's a way with a reasonable performance. | 23:41 |
| * Theuni stops talking and lets Jim catch up. | 23:41 | |
| J1m | OK, good point. So here, the issue is that transaction 2 read an old value of A (to get to B) and therefore updated B. I'll note that these transactions are serializable. The serialization is transaction 2 before transaction 1. I don't see how this simple case would lead to catalog problems, but I suppose that more complex cases could. | 23:44 |
| Theuni | it's rather simple | 23:44 |
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| Theuni | His example was: An index that removes a set when it becomes empty and re-establishes it when it is needed again. | 23:45 |
| Theuni | One transaction was updating the set, the other removing it. *bang* the updated set was gone. | 23:45 |
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| J1m | Right. That's different (and more comlex) than the original example you gave. | 23:46 |
| J1m | Hm. This is a very interesting case. | 23:46 |
| Theuni | Oh, I thought it's the same problem. | 23:47 |
| J1m | Here the inconsistency is not ZODB's fault, except to the case that BTrees happen to be packages with ZODB. | 23:47 |
| Theuni | Ah right. At least it's related. ;) | 23:47 |
| J1m | No. | 23:47 |
| J1m | Not really | 23:47 |
| Theuni | Humm. | 23:47 |
| J1m | In the second example, both transactions are writing B. | 23:47 |
| Theuni | Really? | 23:48 |
| J1m | Yes, you said that one transaction removes an item from the set and the other adds an item. | 23:48 |
| Theuni | No | 23:48 |
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| Theuni | One removes the references to the set. The other one updates it. | 23:48 |
| Theuni | E.g: | 23:48 |
| Theuni | T1: self.myset = None | 23:48 |
| Theuni | T2: self.myset.add(X) | 23:48 |
| J1m | But it only removes the reference when the set becomes empty. | 23:49 |
| Theuni | When it *would* become empty | 23:49 |
| J1m | That is, it only removes the set when it has removed the last value. | 23:49 |
| Theuni | T1: if len(self.myset) == 1: self.myset = None | 23:49 |
| Theuni | Weird optimization decision. | 23:49 |
| Theuni | However, it should be serializable. | 23:49 |
| J1m | ah, interesting. | 23:49 |
| Theuni | :) | 23:49 |
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| J1m | Well, thanks to conflict resolution, there would have been a problem even without the optimization. | 23:52 |
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| J1m | Conflict resolution definately violates consistency. | 23:53 |
| J1m | also, this second case isn't serializable. | 23:53 |
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| J1m | Well, this is an interesting example anyway.] | 23:54 |
| J1m | Well, this is an interesting example anyway. | 23:54 |
| J1m | The catalog case is rather troublesome. | 23:55 |
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| J1m | I'll definitely put some thought into that. | 23:55 |
| Theuni | K. Want me to put that into the collector? | 23:57 |
| J1m | sure | 23:58 |
| Theuni | I'm even more worried that I just picked this up because I called ZODB ACID compatible in my talks and Dieter stepped up and WARNED EVERYBODY IN BIG LETTERS THAT ZODB ISN'T ACID COMPATIBLE. | 23:58 |
| Theuni | And then he goes and says he had that problem for years and he didn't tell. | 23:58 |
| Theuni | Gnah. :/ | 23:59 |
| J1m | Yeah | 23:59 |
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| benji | Theuni: didn't you say that other major RDBMS act in similar ways? | 23:59 |
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