seaside March 2004

seaside@lists.squeakfoundation.org

44 participants
44 discussions

Template system for Seaside + docs
by Peter Schuller 03 Apr '04

03 Apr '04

Hello, based on the web site and some posts on the list, I am under the impression there are now one or more templating systems for Seaside. However I have to admit to not keeping a very close track on things. Am I correct? What is it? Where can I read about it? I'm also wondering about other new features like being able to have meaningful URLs in addition to the usual random session identifier. Is this documented anywhere (other than the source code itself)? Thanks, -- / Peter Schuller, InfiDyne Technologies HB PGP userID: 0xE9758B7D or 'Peter Schuller <peter.schuller(a)infidyne.com>' Key retrieval: Send an E-Mail to getpgpkey(a)scode.org E-Mail: peter.schuller(a)infidyne.com Web: http://www.scode.org

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Latin-1 for SeaSide: howto?
by Samuel Tardieu 01 Apr '04

01 Apr '04

I keep encoutering places where SeaSide incorrectly sends squeak encoded strings instead of iso-8859-1 and receives iso-8859-1 and places them into squeak encoded strings. I wonder whether the conversion should not be done on the data to be sent outside and received from outside rather than on individual spots. Should it be done in KomHttpServer instead? Any hints or ideas? Sam -- Samuel Tardieu -- sam(a)rfc1149.net -- http://www.rfc1149.net/sam

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ROE - Public Store
by Brett Taylor 01 Apr '04

01 Apr '04

I've just published a VisualWorks port of version 3.8 of ROE to the Cincom public store. ROE is a Relational Object Expression system developed by Avi Bryant. >From the package comment "A library for manipulating relational queries as first class Smalltalk expressions, and generating SQL from them. There's no documentation yet, but you can maybe muddle through using the test cases and some comments I made on my blog here: http://www.cincomsmalltalk.com/userblogs/avi/blogView?searchCategory=databa…." In the latest version on Store, I've added support for the Oracle database. This required a bit of refactoring so I've branched on versions. I'll submit the changes to Avi to see if he wants integrate them into the main stream. Brett Taylor

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[ENH] Session with (lazy) form-based login [with attachment]
by miso.list＠auf.net 01 Apr '04

01 Apr '04

Hi - here are two tiny classes (basically 2 methods) implementing: * logging in a user at the session level (allowing the login to be shared by multiple component) * the login is form-based (unlike WAAuthenticatedSession) * the login taps into your existing database of users (ie does not restrict you to a single user as WAAuthenticatedSession does). You need to plug in your own code to tap your db, of course. See #handleLogin * the login is lazy in that it occurs only when a component asks for 'self session user'. This is easy to change into a session-initial login, see the comment in SeasideLoginSession. Since it took me a couple of hours to find how to do this in Seaside, I thought I'd spare someone else :) Also, since I'm fairly new to Seaside, comments or criticisms are welcome. Michal

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Error trying to install Nori (template system)
by Germ�n S. Arduino 31 Mar '04

31 Mar '04

Hi: I want to try Nori, in a 3.7 image with newest version of Comanche and using Seaside 2.5, but can't to install, with the error: This package depends on the following classes: SAXHandler You must resolve these dependencies before you will be able to load these definitions: ZZTemplateParser ZZTemplateParser class>>parseStream: ZZTemplateParser>>characters: ZZTemplateParser>>comment: ZZTemplateParser>>endElement: ZZTemplateParser>>ignorableWhitespace: ZZTemplateParser>>initialize ZZTemplateParser>>parse ZZTemplateParser>>popBody ZZTemplateParser>>popTag ZZTemplateParser>>pushBody ZZTemplateParser>>pushTag: ZZTemplateParser>>startElement:attributeList: Select Proceed to continue, or close this window to cancel the operation. Where is the SAXHandler class? Is another prerequesite package? TIA. gsa.

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Smallblog tweaks
by Colin Putney 30 Mar '04

30 Mar '04

Hi folks, Attached is a tweaked version of Smallblog that runs on Seaside 2.5. Colin

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Re: [Seaside] about roe update issue
by Avi Bryant 30 Mar '04

30 Mar '04

On Mar 28, 2004, at 9:38 PM, danil osipchuk wrote: > Now I'm probably missing some important point about what roe is. > > If goal of roe is to bring relational algebra right here, to > smalltalk, then the most straightforward way of implementation is to > follow SQL (with all theory and industrial usage behind it) precisely. > After all, SQL is proven to be complete implementation of relational > algebra and roe I hope wants to be too. And the later relies on the > former. Ideally, there should be no gap (and problems!) between them. > If something usefull can exist in this area it must be allready there, > in SQL. SQL isn't a very good model of the relational algebra - it certainly has industrial usage behind it, but as far as theory goes it's pretty messy. Now, to be useful ROE does have to output good SQL, so it can't drift too far, but I don't think taking the path of directly mimicking SQL is a good one. I'll make that stronger: I've tried it, and it's a really bad one. The first incarnation of ROE was SqueakQL, an attempt to model SQL in Squeak. It was a nightmare. The key insight of ROE was that I could get a much simpler and cleaner implementation by going back to the relational algebra source and modeling that instead, just using SQL as an intermediate language to convey the algebraic expressions to the database. > This is views in SQL are all about and they are not updateable in > general. Sure, but what I'm proposing is to do what many databases do: to allow updates for the subset of views that are provably reliable to update. I don't think that puts us on any shaky ground (whereas the current #update: implementation, as I suspected and you discovered, did). > Personaly, I would like to see roe (at least it's core) as unshakeable > ground with full sql power and simplicity. On such base more complex > frameworks (like mappers) can be built. One of the ways to get what > you want is to define #asUpdateableView which will try to generate > some smart ConcreteRelation tracking aliases and collapsing sequencies > of selects (and discover some info about references and keys to make > some of joins work). But this would be another level of framework. I agree that doing anything with foreign keys, like automatically collapsing joins, is another level of framework and should not be in the core. I don't agree that simple updatable views need to be; I think the extra simplicity that would bring to the API is worth the slight added complexity it adds to the implementation. However, what's relevant is that you've implemented your way and I haven't implemented mine yet :). Hopefully I'll get something working soon and we can properly compare. > I think not so many things are waiting for implementation right now > to make users (huh, me :)) happy. Luckily you're the best kind of user: when you need something to make you happy, you just add it. Would that all users were the same... (actually, as I'm sure we'd all agree, if all users were even able and willing to just articulate what it is that makes them unhappy, that would be a major win). :) Avi

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Various components usage
by Romain Robbes 30 Mar '04

30 Mar '04

Hi all, I've just started to look at seaside, and I found that there are quite a lot of components already available, which is really neat, as it allows for very easy reuse. So after making a wonderful tabbed counter, I've starting to look at these components, thus my question : Is there somewhere a document explaining briefly what are all those components doing, and how to succintly use them ? For example I tried to use the WATrail component, but I did not figure how to use it. Thanks in advance, Romain Robbes

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WAModelProxy bug in VW Port?
by Josh Braun 29 Mar '04

29 Mar '04

Hello, I ran into what I think is a bug in the port of Seaside to VisualWorks. It seems that the WAModelProxy in VisualWorks doesn't actually read values from its cache when a #performRead: is invoked upon it. Here's my sample code: tmp := WAStoreItem new. tmp description: 'My store item'; price: '5'; subtitle: 'The coolest thing ever!'; title: 'Giant Toy Robot'. proxy := WAModelProxy on: tmp. proxy price: '56'. proxy price (just 'do it' to this line and you should see '5'). The above code works fine in Squeak, but not VW. From what I can tell, it depends on how Symbol functions differently in the two apps. When the cache looks up a value using the selector from the message passed to #doesNotUnderstand:, #performRead: uses the selector as a pure symbol (e.g., #price) at which point it doesn't match the key in the cache for 'price', which is a string. Since it is absent, it goes on to get the value from the wrapped model (i.e., from the WAStoreItem in the above example). For now, I've adjusted my own local version. But I thought I ought to let the list know about this, if it really is a bug. If this isn't a bug, would someone point out the proper usage of WAModelProxy? Thanks, Josh

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about roe update issue
by danil osipchuk 29 Mar '04

29 Mar '04

Hello Avi and list It seems that trouble with updates is reflection of the fact that insert/update/delete operations are not direct subjects of relational algebra. These operations in SQL are defined only for tables and I think roe should behave in the same way. So if #update will be removed from core RARelation and #update: updateBlock where: selectionBlock will be added to table relations instead, issue must cease (the same true for #delete and #deleteWhere: selectionBlock). So there would be no innatural looking SQL expressions as in my previous post. I'm attaching another mcz with approximate implementation in RAPostgresRelation. It breaks testUpdateAlias and testUpdateAliasWithColumn (I think forever, but this seems to be unavoidable). I didn't change RAArrayRelation, so it's broken too. What do you think about all this?

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seaside March 2004