November 2018 - Pharo-users

Pharo 7 Loading stops at Seaside-Pharo-JSON-Jo....5
by Sanjay Minni Nov. 24, 2018

Nov. 24, 2018

How do I proceed from here ? (Pharo 7 32 bit on Win 10) whle installing a developed package - Loading stops at Seaside-Pharo-JSON-Jo....5 This package depends on the following classes: WAPharoEncoder You must resolve these dependencies before you will be able to load these definitions: WAPharoJsonEncoder WAPharoJsonEncoder>>#delegateOn: WAPharoJsonEncoder>>#initialize WAPharoJsonEncoder>>#initializeJsonTable ----- --- Regards, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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[ANN] JSON schema implementation
by Norbert Hartl Nov. 23, 2018

Nov. 23, 2018

JSONSchema =========== This is an implementation of JSON Schema for the pharo language. It is used to define the structure and values of a JSON string and to validate it. The schema itself can be externalized for being consumed by a third party. I like to announce the availability of a JSON schema implementation for pharo. As part of my implementation of OpenAPI (which is to be released a bit later) I factored out the JSON schema part into its own repository because I think it is useful. I release it even it is not really finished. Code is mostly undocumented and a lot of features are missing from the full spec. I will improve it slowly and add features as I need them or they being requested Hope you like it! Norbert ==== The documentation so far (from https://github.com/zweidenker/JSONSchema <https://github.com/zweidenker/JSONSchema>) It can be loaded by downloading it in pharo via Metacello new repository: 'github://zweidenker/JSONSchema'; baseline: #JSONSchema; load Defining a schema ------------------------- These are the expression to create a schema model inside pharo. schema := { #name -> JSONSchema string. #dateAndTime -> (JSONSchema stringWithFormat: 'date-time'). #numberOfPets -> JSONSchema number } asJSONSchema. defines as schema that can parse the following JSON: jsonString := '{ "name" : "John Doe", "dateAndTime" : "1970-01-01T14:00:00", "numberOfPets" : 3 }'. Reading/Writing a value using a schema ------------------------------------------------------ To parse the value from JSON we only need to invoke: value := schema read: jsonString The object in value will have name as a string, dateAndTime as a DateAndTime object and numberOfPets as a SmallInteger object. The schema can also be used to write out the value as JSON. This is especially useful if we want to ensure that only valid JSON is written. For this invoke jsonString := schema write: value. Serialize/Materialize a schema ---------------------------------------- Addtionally to reading and writing objects a schema can be serialized to string. schemaString := NeoJSONWriter toStringPretty: schema. gives { "type" : "object", "properties" : { "name" : { "type" : "string" }, "numberOfPets" : { "type" : "number" }, "dateAndTime" : { "type" : "string", "format" : "date-time" } } } If we would get a schema as string we can instantiate by invoking schema := JSONSchema fromString: schemaString. Nested schemas ----------------------- Schemas can be nested in any depth. And it can be specified by using the literal Array syntax. schema := { #name -> JSONSchema string. #address -> { #street -> JSONSchema string. #number -> JSONSchema number } } asJSONSchema Constraints --------------- JSON Schema has a defined set of constraints that can be specified. E.g. for a number the inerval of the value can be specified by numberSchema := JSONSchema number. numberSchema interval minimum: 1; exclusiveMaximum: 100 constraining the number value to be greater or equal to 1 and smaller than 100.

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Re: [Pharo-users] can't debug TinyBlog in the Pharo MOOC
by Cyril Ferlicot Nov. 23, 2018

Nov. 23, 2018

On Fri, Nov 23, 2018 at 1:25 PM iu136 via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > You were right Esteban, finally I fixed it by manually executing the code > below at Playground: > > | repository | > repository := VOMongoRepository database: 'tinyblog'. > repository enableSingleton . > > Even thought I was putting the above code at initialize method of TBMBlog, > but I don't know why its never get executed! Hi, Class initialisation methods are executed at loading. If you write the method the first time it will not execute it by default. > Thank you very much for your help! > > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > -- Cyril Ferlicot https://ferlicot.fr

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[ANN] Next Pharo Sprint: Nov 30
by Marcus Denker Nov. 23, 2018

Nov. 23, 2018

We will organize a Pharo sprint / Moose dojo Nov 30, starting at 10:00am. (Local Time Paris). Goals of this sprint: â¢ Pharo 7 issues Remote Sprint: Remotely, you can join us on Discord. During the sprint, we synchronize local and remote Pharo sprinters: http://pharo.org/contribute-events Known Local Sprint meetings Lille/France: It will be at the Inria Lille, Building B, third floor (RMoD offices). As the building is not open to the public, please contact us before if you plan to come https://association.pharo.org/event-2973626

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Re: [Pharo-users] can't debug TinyBlog in the Pharo MOOC
by Esteban Lorenzano Nov. 23, 2018

Nov. 23, 2018

> On 22 Nov 2018, at 21:48, iu136 via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: iu136 <iu136(a)yahoo.com> > Subject: Re: can't debug TinyBlog in the Pharo MOOC > Date: 22 November 2018 at 21:48:52 CET > To: pharo-users(a)lists.pharo.org > > > EstebanLM wrote >> Hi, >> >> You are missing to initialise the Voyage repository. >> I donât know how is explained in the Mooc, but you will probably need to >> do something like: >> >> VOMemoryRepository new enableSingleton. >> >> Cheers, >> Esteban > > Hi Esteban. > > actually I'm using an External Mongo database and in the MOOC the > initialization of Voyage Mongo repository, is done like: > > TBBlog class >> initializeLocalhostMongoDB > | repository | > repository := VOMongoRepository database: 'tinyblog'. > repository enableSingleton. > > TBBlog class >> reset > self initializeLocalhostMongoDB > > and in my code I'm doing exactly like above. but interestingly when I wanted > to reset the cache of Voyage by: > VORepository current reset > > again I've got another Error saying: "MessageNotUnderstood: receiver of > "reset" is nillâ. Which again, should means you never executed initializeLocalhostMongoDB method. Can you try doing: TBBlock initializeLocalhostMongoDB. Esteban > > thanks anyway! > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > >

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Re: [Pharo-users] can't debug TinyBlog in the Pharo MOOC
by Esteban Lorenzano Nov. 22, 2018

Nov. 22, 2018

Hi, You are missing to initialise the Voyage repository. I donât know how is explained in the Mooc, but you will probably need to do something like: VOMemoryRepository new enableSingleton. Cheers, Esteban > On 22 Nov 2018, at 17:51, iu136 via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: iu136 <iu136(a)yahoo.com> > Subject: can't debug TinyBlog in the Pharo MOOC > Date: 22 November 2018 at 17:51:12 CET > To: pharo-users(a)lists.pharo.org > > > hi guys > I'm following the Pharo MOOC and I'm at Week 4. the other day, I was trying > to implement TinyBlog: Data Persistency using Voyage and Mongo, when I tried > to compile the code, I've got an Error. the title of Error says: > "MessageNotUnderstood: receiver of "save:" is nil", and it refers to > TBMBlog>>writeBlogPost. > > TBMBlog>>writeBlogPost: aTBMPost > posts add: aTBMPost. > aTBMPost save. > self save . > > thanks for your answers! > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > >

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can't debug TinyBlog in the Pharo MOOC
by iu136 Nov. 22, 2018

Nov. 22, 2018

hi guys I'm following the Pharo MOOC and I'm at Week 4. the other day, I was trying to implement TinyBlog: Data Persistency using Voyage and Mongo, when I tried to compile the code, I've got an Error. the title of Error says: "MessageNotUnderstood: receiver of "save:" is nil", and it refers to TBMBlog>>writeBlogPost. TBMBlog>>writeBlogPost: aTBMPost posts add: aTBMPost. aTBMPost save. self save . thanks for your answers! -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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MetaLink>>level: failing?
by Vitor Medina Cruz Nov. 22, 2018

Nov. 22, 2018

Hello, I am playing with MetaLink, really cool!, but I am having issues that I am unsure if it's some erro or if I am doing something wrong (I am using Pharo 6.1 32 bits in windows.). Consider: TestMetaLink>>execute UIManager default alert: 'Actual Version'. And in Playground: | link | link := MetaLink new metaObject: [ :object | UIManager default alert: 'Linked Version' ]; selector: #value:; arguments: #(#object); control: #instead. (TestMetaLink >> #execute) ast link: link. TestMetaLink new execute. link uninstall. This works as expected, an alert with 'Linked Version' is promped. But then suppose I want to execute the actual node alongside with the linked one considering some condition: | link choice | choice := true. link := MetaLink new metaObject: [ :object :selector :arguments | UIManager default alert: 'Linked Version'. choice ifTrue: [ object perform: selector withArguments: arguments]. ]; selector: #value:value:value:; arguments: #(#object #selector #arguments); control: #instead; * level: 0*. (TestMetaLink >> #execute) ast link: link. TestMetaLink new execute. link uninstall. As I understand, level:0 is necessary in order to avoid an infinite loop, but then I get an error: KeyNotFound: key #RFArgumentsReificationVar not found in Dictionary Am I doing something wrong? Is that an error? Best Regards, Vitor

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Re: [Pharo-users] My Keynote at the Salta Conference
by horrido Nov. 22, 2018

Nov. 22, 2018

Thank you for your well-considered responses. I appreciate them. As I said in the original post, I am open to an alternative approach to the competition. The current approach may be problematic, I don't know. I still want a five-round four-person team event. I want to stretch this out for maximum effect. I want to structure it like a sporting event in order to raise excitement. There are several key points: 1) It has to sufficiently challenging to the contestants so that they really learn to use Pharo effectively. This should also help to mitigate cheating. After all, where are they going to find a sharp Smalltalker to aid in deception? ;-) 2) It has to be easy to "judge" each round. This should be automatable. After all, if there are 500 teams, we don't want to spend countless hours judging the team submissions manually. It would be daunting. At this point, I welcome any new ideas for the competition. Pharo Smalltalk Users mailing list wrote > OK, sorry. I missed that. > > Now I've read it. And it requires a customized VM that can count bytecodes > executed against a budget and terminate execution if the budget is > exceeded. > > For the developer it requires an awareness of the relationship between > bytecodes and source code. I, personally, have virtually no idea what > that relationship is. I used Smalltalk as a high level language and try > not to worry about how expensive things are until it actually matters. I > think that is most developers. > > So I'm not really a fan of this contest approach. The implementation is > certainly beyond my skills. I have been dabbling with Squeak since its > release and only recently trying to get into Pharo "in anger" because I > have a couple projects I personally want to realize. I'm finding the > entire thing to be really fast moving and hard to get my head around and > the VM is pretty much still impenetrable to me after a couple months > trying to build one. > > So I'm definitely not your guy and the number of people who are on top of > the VM enough to pull this off is likely on the order of ten. > > Maybe a different kind of coding contest? I'd try adapting problems from > some existing competition questions. > >> On Nov 20, 2018, at 6:32 PM, horrido < > horrido.hobbies@ > > wrote: >> >> Basically, implementing what was outlined in David Buck's document >> (attached >> to the original post). It may involve hacking the VM to count byte codes. >> >> SmalltalkContestIdeas.docx >> <http://forum.world.st/file/t128560/SmalltalkContestIdeas.docx >> <http://forum.world.st/file/t128560/SmalltalkContestIdeas.docx>> >> >> >> Pharo Smalltalk Users mailing list wrote >>> OK, I'll bite. >>> >>> What does "code the competition" mean exactly? >>> >>> I last used Smalltalk "in anger" pre-pharo with squeak. I live ST and >>> am >>> looking for a way back "in" but >>> TBH the changes from Squeak are vast and I have too many ideas to work >>> on >>> and keep hitting walls. >>> >>> I'm intrigued but need more direction. Whatcha need - ELI5. >>> >>> >>> >>>> On Nov 20, 2018, at 5:13 PM, horrido < >> >>> horrido.hobbies@ >> >>> > wrote: >>>> >>>> No, the money isn't lost. I was merely suggesting that without some >>>> help, >>>> the >>>> marketing opportunity for this competition would be lost. >>>> >>>> I'm not sure you understand how much work is involved in this project. >>>> I >>>> will be doing a great deal of the heavy lifting. I have to setup the >>>> competition website server. I have to advertise or reach out to high >>>> schools >>>> across the country. I have to get local media interested in covering >>>> the >>>> competition. I have to look into producing the T-shirt swag, and >>>> shipping >>>> the T-shirts to all contest participants, and at an affordable rate to >>>> fit >>>> the budget. Those are only a few things off the top of my head. >>>> >>>> Coding the actual contest problems according to David Buck's >>>> prescription >>>> shouldn't be open-ended and shouldn't be a huge commitment. I imagine >>>> it >>>> would be a couple of months of work during spare time. >>>> >>>> >>>> >>>> jgfoster wrote >>>>> Hi Richard, >>>>> >>>>> So the $$$$ that we gave you is now âlost"? Perhaps people didnât >>>>> understand what you expected from us other than money. What else is >>>>> needed >>>>> to make your project a success? We are supposed to âcode the >>>>> competitionâ >>>>> as well? Anything else? >>>>> >>>>> Is this practice of insulting people (âDoesnât anyone care about >>>>> promoting >>>>> Pharo?â) supposed to be motivating? Is it a demonstration of you >>>>> expertise >>>>> at marketing? Does it build confidence about how the Smalltalk >>>>> community >>>>> will be perceived by the new arrivals? >>>>> >>>>> Iâve appreciated your blog posts and your passion, but Iâm put off by >>>>> this >>>>> approach. >>>>> >>>>> James >>>>> >>>>> P.S. I realize that Iâm probably doing what Iâm criticizing in >>>>> youâthrowing out negative comments from behind a keyboard to score >>>>> points >>>>> when I might not be so harsh in person. >>>>> >>>>>> On Nov 20, 2018, at 2:36 PM, Richard Kenneth Eng < >>>> >>>>> horrido.hobbies@ >>>> >>>>> > wrote: >>>>>> >>>>>> Not even a single nibble? Doesn't anyone care about promoting Pharo? >>>>>> >>>>>> What a colossal lost opportunity! >>>>>> >>>>>> >>>>>> On Sun, 18 Nov 2018 at 09:29, Richard Kenneth Eng < >>>> >>>>> horrido.hobbies@ >>>> >>>>> <mailto: >>>> >>>>> horrido.hobbies@ >>>> >>>>> >> wrote: >>>>>> Some of you may already be aware of my presentation at Smalltalks >>>>>> 2018, >>>>>> the outcome of which was full funding for my Smalltalk programming >>>>>> competition. See My Keynote at the Salta Conference >>>>>> <https://hackernoon.com/my-keynote-at-the-salta-conference-435dfaccc888&gt >>>>>> <https://hackernoon.com/my-keynote-at-the-salta-conference-435dfaccc888&gt> >>>>>> <https://hackernoon.com/my-keynote-at-the-salta-conference-435dfaccc888&gt&gt >>>>>> <https://hackernoon.com/my-keynote-at-the-salta-conference-435dfaccc888&amp;gt&gt>;;. >>>>>> >>>>>> Three years ago, David Buck provided an outline for the competition. >>>>>> See >>>>>> attached. >>>>>> >>>>>> I would like to use that as a starting point, though I am open to >>>>>> alternative suggestions. >>>>>> >>>>>> The reason for this post is the following... >>>>>> >>>>>> I need volunteers to code the competition. I am nowhere near >>>>>> qualified >>>>>> to >>>>>> do so, as my knowledge of Pharo is limited. >>>>>> >>>>>> Without help from Pharoers (or, at least, Smalltalkers), the >>>>>> competition >>>>>> is in jeopardy. This is a great opportunity to promote Pharo. (The >>>>>> original competition three years ago was going to use VisualWorks, >>>>>> but >>>>>> since Cincom did not see fit to support my competition this year, I >>>>>> decided to go with Pharo.) >>>>>> >>>>>> Please contact me if anyone is interested. It would be a terrible >>>>>> shame >>>>>> to waste this opportunity. >>>>>> >>>>>> Regards, >>>>>> Richard >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >>>> <http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html> >>>> <http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html&gt >>>> <http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html&gt>; >> >> >> >> >> >> -- >> Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >> <http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html> -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

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ESUG 2018 Videos
by Jimmie Houchin Nov. 21, 2018

Nov. 21, 2018

Any idea when they will be available. No pressure. Just interested and curious. Thanks. Jimmie

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