- Pharo-users - lists.pharo.org

Re: [Pharo-users] PharoByExample Announcements chapter

by Dimitris Chloupis

I dont know. That will depend on how useful Announcements are. I have not seen them used so heavily in Pharo. Also it will depend whether PBE should be considered a begineers book. I think it would be better if we keep it a begineers book and have another book called "Advanced Pharo By Example" for more advanced topics like Announcements etc. On the other hand thatâs all typical stuff, the important thing is to document Announcements. On Tue, Aug 4, 2015 at 1:19 AM Peter UhnÃ¡k <i.uhnak(a)gmail.com> wrote: > Hi, > > shouldn't there be Announcements chapter in the new PharoByExampleUpdated > book? > Because I don't see it there and I think it should be there, since > currently I don't see any authoritative source of information for people > about Announcements. > > Thanks, > Peter >

Aug. 4, 2015

Re: [Pharo-users] Teapot and Regex

by Marcus Kemper

Hi Joachim, my first steps in teapot used the named parameters (and manually sending the URL), but as soon as I used the HTML form, I had to switch to regex (I thought). Maybe this was wrong, but your hint concerning the 'req' will certainly yield new insights. I will try to find the req object and check what is going on with it... :-) thanks and kind regards Marcus jtuchel(a)objektfabrik.de <jtuchel(a)objektfabrik.de> schrieb am Di., 4. Aug. 2015 um 13:12 Uhr: > Marcus, > > >Hi Joachim, > > > thanks for your feedback. Concerning the order of the values I rely solely > > on the teapot error message. > > The way I understand your code snippet, you access the url parameters by using "at: 1". I have never used Teapot, but would be surprised if it encourages this. In HTTP world, a parameter consists of its name and value, both being Strings. > > > Besides I have no idea how I could make this > > GET request independant from the order the HTML form generated. > > You shouldn't be required to do anything. In the Smalltalk web frameworks I know (Sst and Seaside mostly) an HTTPRequest object has a Dictionary like API for accessing parameters. Maybe something like "parameterAt: 'r'" should do the trick. > > > Maybe with Javascript? > > Javascript is the source of a lot of evil, but here, it is innocent like Cinderella. > Normal HTTP processing still works without javascript and I hope this won't change any time soon. This is simple HTTP back and forth, no javascript required nor desired. > > > But I assume this simple scenario should work in teapot and I > > just understand it correctly... > > Hmm. As I said, don't access url parameters by index, only by name. I am sure Teapot offers methods for that, in the most basic case it gives you a Dictionary or parameters, but most likely some wrapper that provides a Dictionary-esque access methods. > > Maybe this bit is a starting point (found here https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessf…) > > > 3.1. Parameters in URLs > > The URL pattern may contain named parameters (e.g., <user> above), whose > values are accessible via the request object. The request is an extension > of ZnRequest with some extra methods. > > Query parameters and Form parameters can be accessed the same way as path > parameters (req at: #paramName). Teapot can perform conversions of > parameters to a number, for example as follows: > > Teapot on > GET: '/user/<id:IsInteger>' -> [ :req | users findById: (req at: #id)]; > output: #ston; > start. > > But hey, now I see why you wanted to use Regex: Chapter 3.2 introduces > them.... So what can you do if you want to use the reqex stuff? I'd start > by adding a Breakpoint into the handler block and inspect the req object > that gets passed in. Maybe somethins is wrong about your regex (I am far > from being an expert on Regular Expressions) and Teapot is not doing any > harm. Joachim > > -- > ----------------------------------------------------------------------- > Objektfabrik Joachim Tuchel mailto:jtuchel@objektfabrik.de <jtuchel(a)objektfabrik.de> > Fliederweg 1 http://www.objektfabrik.de > D-71640 Ludwigsburg http://joachimtuchel.wordpress.com > Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1 > > >

Aug. 4, 2015

Re: [Pharo-users] Sharing Inter-image Data

by jtuchel＠objektfabrik.de

Sean, I guess most guarding is based on optimistic locking these days. But neither Seaside nor Amber imposes any mechanism on the developer. So you are on your own there. I have been using TOPLink or Glorp and Seaside for a few years now, and all I've seen or used so far used optimistic locking provided by the persistency mechanism. No doubt you can use JS and Ajax or even WebSockets to make the round-trip feel more responsive. But there still is the risk of the gap between some JS request being answered (can these objects be updated?) and the actual attempt to update. So you basically would do a full round trip anyways (dear server, update these objects if possible!). It depends on your taste if that is any better than just using a normal round trip, like in Seaside. An additional problem could be that you need to handle objects on the client, which you typically don't in Seaside, which only renders pages down to the client. HTH Joachim Am 04.08.15 um 12:54 schrieb Sean P. DeNigris: > When using any tool that exposes objects outside the image - Seaside, Amber, > rST - how does one guard against simultaneous edits? Up until now, I've been > perfectly content with single images and read-only web apps, but now that > I'm considering some stateful web apps/services, I can't remember ever > seeing locking addressed. And I wonder if all the cool new JS technology > could make the process more responsive i.e. notify the client if the > underlying data has changed... > > > > ----- > Cheers, > Sean > -- > View this message in context: http://forum.world.st/Sharing-Inter-image-Data-tp4840912.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > -- ----------------------------------------------------------------------- Objektfabrik Joachim Tuchel mailto:jtuchel@objektfabrik.de Fliederweg 1 http://www.objektfabrik.de D-71640 Ludwigsburg http://joachimtuchel.wordpress.com Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1

Aug. 4, 2015

Re: [Pharo-users] Teapot and Regex

by jtuchel＠objektfabrik.de

Marcus, >Hi Joachim, > thanks for your feedback. Concerning the order of the values I rely solely > on the teapot error message. The way I understand your code snippet, you access the url parameters by using "at: 1". I have never used Teapot, but would be surprised if it encourages this. In HTTP world, a parameter consists of its name and value, both being Strings. > Besides I have no idea how I could make this > GET request independant from the order the HTML form generated. You shouldn't be required to do anything. In the Smalltalk web frameworks I know (Sst and Seaside mostly) an HTTPRequest object has a Dictionary like API for accessing parameters. Maybe something like "parameterAt: 'r'" should do the trick. > Maybe with Javascript? Javascript is the source of a lot of evil, but here, it is innocent like Cinderella. Normal HTTP processing still works without javascript and I hope this won't change any time soon. This is simple HTTP back and forth, no javascript required nor desired. > But I assume this simple scenario should work in teapot and I > just understand it correctly... Hmm. As I said, don't access url parameters by index, only by name. I am sure Teapot offers methods for that, in the most basic case it gives you a Dictionary or parameters, but most likely some wrapper that provides a Dictionary-esque access methods. Maybe this bit is a starting point (found here https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessf…) 3.1. Parameters in URLs The URL pattern may contain named parameters (e.g., |<user>| above), whose values are accessible via the request object. The request is an extension of |ZnRequest| with some extra methods. Query parameters and Form parameters can be accessed the same way as path parameters |(req at: #paramName)|. Teapot can perform conversions of parameters to a number, for example as follows: |Teapot on GET: '/user/<id:IsInteger>' -> [ :req | users findById: (req at: #id)]; output: #ston; start.| But hey, now I see why you wanted to use Regex: Chapter 3.2 introduces them.... So what can you do if you want to use the reqex stuff? I'd start by adding a Breakpoint into the handler block and inspect the req object that gets passed in. Maybe somethins is wrong about your regex (I am far from being an expert on Regular Expressions) and Teapot is not doing any harm. Joachim -- ----------------------------------------------------------------------- Objektfabrik Joachim Tuchel mailto:jtuchel@objektfabrik.de Fliederweg 1 http://www.objektfabrik.de D-71640 Ludwigsburg http://joachimtuchel.wordpress.com Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1

Aug. 4, 2015

Sharing Inter-image Data

by Sean P. DeNigris

When using any tool that exposes objects outside the image - Seaside, Amber, rST - how does one guard against simultaneous edits? Up until now, I've been perfectly content with single images and read-only web apps, but now that I'm considering some stateful web apps/services, I can't remember ever seeing locking addressed. And I wonder if all the cool new JS technology could make the process more responsive i.e. notify the client if the underlying data has changed... ----- Cheers, Sean -- View this message in context: http://forum.world.st/Sharing-Inter-image-Data-tp4840912.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Aug. 4, 2015

Re: Teapot and Regex

by mtk

Hi Joachim, thanks for your feedback. Concerning the order of the values I rely solely on the teapot error message. Besides I have no idea how I could make this GET request independant from the order the HTML form generated. Maybe with Javascript? But I assume this simple scenario should work in teapot and I just understand it correctly... Kind regards Marcus -- View this message in context: http://forum.world.st/Teapot-and-Regex-tp4840893p4840908.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Aug. 4, 2015

Seamless

by Sean P. DeNigris

1. What is the status of this project (http://ss3.gemstone.com/ss/Seamless.html)? I see the last commit is in April. Does it "work"? 2. Can the communication be done securely? If I had two images each running on a server in a different physical location, could they communicate over something like SSL? ----- Cheers, Sean -- View this message in context: http://forum.world.st/Seamless-tp4840907.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Aug. 4, 2015

Re: [Pharo-users] Teapot and Regex

by jtuchel＠objektfabrik.de

Marcus, I have no answers to your questions, but it seems like you expect the URL parameters in a specified order. I am nat sure this is a good idea at all. So independent on why the order of the parameters is changed and by whom: you shouldn't rely on it. Sure, this doesn't really help to understand or fix the problem at hand. But there should be no problem if you handled parameters by name rather than their order. Are you sure the order of parameters is changed by Teapot? Joachim -- ----------------------------------------------------------------------- Objektfabrik Joachim Tuchel mailto:jtuchel@objektfabrik.de Fliederweg 1 http://www.objektfabrik.de D-71640 Ludwigsburg http://joachimtuchel.wordpress.com Telefon: +49 7141 56 10 86 0 Fax: +49 7141 56 10 86 1

Aug. 4, 2015

Teapot and Regex

by mtk

Dear Smalltalkers (Pharonistas?), while trying out teapot in Pharo4, I encountered the following: I have made a plain HTML form which sends data to a teapot URL. Here is what the browser is sending: http://localhost:1701/bac/?a=88&r=0.7&kg=77 To answer this request via teapot, I wrote the following: ... GET:'\/bac\/\?a=(\d*)&r=(\d*.\d*)&kg=(\d*)' asRegex -> [:req | BloodAlcoholCalculator a:(req at:1) r:(req at:2) kg:(req at:3) ]; ... But the answer in the Browser looks like: Not Found /bac/?r=0.7&a=88&kg=77 I tested the regular expression via 'matchesRegex' and it returned 'true'. The funny thing is, that teapot changes the order of the values in the answer (r and a are switched). If I leave out the '\?' and use the resulting URL manually, teapot delivers the expected behaviour. What could be the reason for this issue and where should I search to understand it (System Browser)? Thanks for the attention and kind regards Marcus -- View this message in context: http://forum.world.st/Teapot-and-Regex-tp4840892.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Aug. 4, 2015

Re: [Pharo-users] MongoDB: console commands? query embedded indexed fields?

by Norbert Hartl

Sabine, > Am 04.08.2015 um 07:08 schrieb Sabine Manaa <manaa.sabine(a)gmail.com>: > > Hi, > > I have 2 questions concerning use of mongoDB classes: > 1) how can I send mongo console commands directly from smalltalk > 2) how to query on an embedded collection with an index > > Model: > I have trips and each trip has an embedded collection of N receipts like > this: > { "tripName" : "trip 1", > {"receipts" : [ > {"receiptDescription" : "receipt 1" } > {"receiptDescription" : "receipt 2" } > {"receiptDescription" : "receipt 3" } ], > } > > Index: > For quick search, I created an index on the embeded[1] receipts with this > command at the mongoDB console in a terminal (NOT in smalltalk) > (mongo console starts with mongo in the MongoDB/bin dir): > > db.Trips.createIndex({"receipts.receiptDescription":1}) > > with a command like this in the mongoDB console > > db.Trips.find({"receipts.receiptDescription":"receipt 1"}) > > I get the resulting receipt. > > Before, I have to set the database with "use {databasename}" in thr mongodb > console > > My questions: > 1) how can I send mongo console commands directly from smalltalk, e.g. use > database, set index etc. I don't know why you want to use "use database". For queries you don't need this because you choose the database and collection by using the smalltalk classes. You can look there if something you need exists. Creating indexes is not yet supported. I want to do that myself. As always there seems to be to less people implementing stuff like that. > Is this possible? > I did not succeed with the mongo command: method, it always returns "no such > cmd". > > 2) how can I search for a receipt which is indexed as described from > smalltalk? A simple Trip selectMany: { 'receipts.receiptDescription' -> 'Tankquittung' } asDictionary should do. You can use just the nested properties form. The index will be selected automatically. If you are not sure about queries read about explain [1] to optimize that stuff. [1] http://docs.mongodb.org/manual/reference/method/cursor.explain/#cursor.expl… <http://docs.mongodb.org/manual/reference/method/cursor.explain/#cursor.expl…> Norbert > I did not succeed with the description [2] I am not sure if it is covered by > it. > > Regards > Sabine > > > [1] > http://docs.mongodb.org/manual/core/index-multikey/#index-arrays-with-embed… > [2] http://smallworks.eu/web/blog/2013-07-18-Voyage-advanced-queries > > > > -- > View this message in context: http://forum.world.st/MongoDB-console-commands-query-embedded-indexed-field… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

Aug. 4, 2015