- Pharo-users - lists.pharo.org

Re: [Pharo-users] Embedding object properties in NeoJSON mappings

by Sven Van Caekenberghe

Hi, > On 22 Feb 2019, at 02:05, Esteban Maringolo <emaringolo(a)gmail.com> wrote: > > Hi all (again), > > As part of writing the port (and adaptation to use Zinc and NeoJSON), > a CouchDB JSON-REST API, now I find something I don't know how to > solve using NeoJSON mappings. > > All objects you store in CouchDB at a particular URI are saved as > "Documents", so if you save a dictionary with keys "name", "height", > "c" to "/people/1234" , when you query "people/1234" you get the keys > of the saved dictionary PLUS to extra keys called _id and _rev. > > Then when you query (GET) back the document you get a JSON like this: > {"_id": ..., "_rev": ..., "name": ..., "height":...,} > > My Idea is that I can wrap any object serializable as JSON within > aDocument, but then if I define CouchDocument class>>#neoJsonMapping: > mapper as: > > mapper for: self do: [ :mapping | > mapping mapAccessor: #id to: '_id'. > mapping mapAccessor: #revision to: '_rev'. > mapping mapAccessor: #class to: '_class' > ]. > > I have no way to "flatten"/"merge" anObject within aDocument. > > I would expect something like > > mapper for: self do: [ :mapping | > mapping mapAccessor: #id to: '_id'. > mapping mapAccessor: #revision to: '_rev'. > mapping mapAccessor: #class to: '_class' > mapping embed: [:object | object whatToEmbed] > ]. > > Of course this is awkward, because if I need to read it back, the > "extraction" of the embeded properties needs to know which belongs to > which and more importantly , what to instantiate! > > Of course I can do it manually without using NeoJSON (It's already > being done [1]) , but I like when different libraries things fit > naturally together :) > > > Am I stretching it too much? :) Yes, this is out of the scope of NeoJSON. As you know, JSON is strictly limited and kept simple, by design. Things people do to shoehorn objects, classes, types, ids, collections, references, etc on to it are exactly that, hacks on top. There are many ways to try to do any of this. What you are doing now, a two pass approach, is what I would do too: first use NeoJSON to get a standard structure (maybe use NeoJSONObject for simplicity), next do some extra work - and vice versa. Note that Pharo itself might lack some meta info to describe a mapping by itself (collections have no element types for example), so a good mapping is always necessary to go to a statically typed model. There is a reason STON exists, it is one answer to this problem. Sven > Regards, > > > [1] Currently the writing is done manually and the refresh (which is > also a GET) does the following: > > CouchDocument>>#refresh > " Update this Document to the latest revision " > | response | > response := self information. "response is a Dictionary" > revision := response at: '_rev'. > object := response couchToObject. > ^response > > And here happens the magic, it searchs for a "_class" key which if > present will use to instantiate the object "wrapped" by the document. > > Dictionary>>couchToObject > | class object | > self removeKey: '_id' ifAbsent: []. > self removeKey: '_rev' ifAbsent: []. > self keysAndValuesDo: [:key :value | self at: key put: value couchToObject]. > class := (self at: '_class' ifAbsent: [^self]) asSymbol asClass. > object := class basicNew. > object jsonInstanceVariableNames keysAndValuesDo: [:index :key | > self at: key ifPresent: [:value | object instVarAt: index put: value]]. > ^object > > #jsonInstanceVariableNames is another level of "mapping" here, that > defined what to map from the Document response. > > > Esteban A. Maringolo >

Feb. 22, 2019

Remember to registrar to Pharo days 2019!

by Esteban Lorenzano

Dear all, Pharo days registration is open since two weeks now, and we are starting to work on the schedule and organising the social event :) Register now! Pharo days is a gathering of the Pharo community to exchange, discuss and code with your online colleagues. Join us to share your experiences and help to make a better Pharo! To register, please proceed to the Pharo Days 2019 web page: https://pharo.org/2019PharoDays <https://pharo.org/2019PharoDays>, or go directly to the association event: https://association.pharo.org/event-3255426 <https://association.pharo.org/event-3255426>. (Yes, the schedule is still to be defined, stay tuned). If there are any questions or problems, I am happy to answer them. Esteban

Feb. 22, 2019

Re: [Pharo-users] im using pharo 7 with linux env. but cannot input korean.

by Hilaire

Thanks Pierce. So kind of work out of the box as long as the appropriate font is selected. Hilaire Le 22/02/2019 Ã 04:34, Pierce Ng a Ã©critÂ : > Hi Hilaire, > > My self-built VM on Windows 7 doesn't have the option either. But, > multilingual input into Pharo works. > > Outside of Pharo, configure Windows multilingual input. Within Pharo, > choose a font like Arial Unicode MS. Then just switch Windows input > system using hot-key or mouse click, and type. See screenshot. > > Pierce -- Dr. Geo http://drgeo.eu

Feb. 22, 2019

Re: [Pharo-users] Partition/Sync ready databases for Pharo?

by Pierce Ng

On Tue, Feb 19, 2019 at 01:02:51PM +0000, Tim Mackinnon wrote: > When you say Fossil - are you referring to > "https://fossil-scm.org/index.html/doc/trunk/www/index.wikiâ ? > Iâve seen it come up a few times - is it good? Yes I mean the Fossil SCM. I use it as a personal wiki and file repo. It comes with built-in ticketing system and forum, all wrapped into one executable file. Fossil also imports/exports Git repos. I'd use Fossil for small development teams too. Except for game development and other cases involving multi-GB repos with lots of binary blobs. > can you hook into it to save application runtime artefacts such that a > distributed application can read them back Fossil was designed as a standalone executable. It is difficult to "library-ify" and the developers have no plan to do so. But it is just a single executable, supports JSON output for some of its functions, and can be invoked via OSSubprocess and the like, conceptually similar to how Iceberg uses libgit2 to do Git stuff. Pierce

Feb. 22, 2019

Re: [Pharo-users] Partition/Sync ready databases for Pharo?

by Pierce Ng

On Tue, Feb 19, 2019 at 10:36:18AM -0300, Esteban Maringolo wrote: > No problem, I was going to ask about Fossil as well, I know it is a > self contained SCM, with issue tracker, and whatnot. People that uses > it don't want to use git except if forced to. > So I also ask how this would work. :) Fossil's built-in sync mechanism is described at https://fossil-scm.org/index.html/doc/trunk/www/sync.wiki. Fossil's traffic works through tunneling - this is how I 'fossil push' new blog posts from my laptop to my server through an SSH tunnel. I had also tested Fossil behind Internet-reachable Caddy HTTPS reverse proxy, which works too. For your use case, I might approach it like this: Write data locally and commit to Fossil as blobs. To sync, run Fossil under OSSubprocess to sync with the central server, either directly (if Fossil on central server is directly reachable) or thru a tunnel created by your application if your application runs on both ends. > I saw SQLite-sync before, but it is a commercial product, and its > platform support/setup seems convoluted. > > dqlite might be a viable alternative, from more than reliable > provider, it's is not clear whether I have to use a different library > to access SQLite (it seems so) or a special wire protocol/api calls. I was actually thinking of https://github.com/rqlite/rqlite/ but did not remember the name when I replied originally. But it seems that, however you choose to sync, your application still needs to handle any data conflict that arises. Pierce

Feb. 22, 2019

Re: [Pharo-users] Running pharo in daemon mode

by Pierce Ng

On Tue, Feb 19, 2019 at 05:17:34AM -0800, sergio ruiz wrote: > My daemontools run file looks like: > but for some reason, it just sits and grinds and restarts.. never remaining > started for more than a second.. PharoDebug.log or "ps ax | egrep readproctitle" should contain some clues. > VM="/home/bandtracker/pharoImages/pharo" > IMAGE="/home/bandtracker/pharoImages/Pharo.image" Looks like you put the VM and image/changes files in the same directory. Depending on how you set up, Pharo may need write-access to the image's containing directory, /home/bandtracker/pharoImages in your case. I suggest to put the VM files somewhere else, and owned by root:root. This greatly reduces the risk of bug or exploited vulnerability in your code or Pharo running as your uid overwriting the VM files. Pierce

Feb. 22, 2019

Re: [Pharo-users] im using pharo 7 with linux env. but cannot input korean.

by Pierce Ng

On Tue, Feb 19, 2019 at 09:42:18AM +0100, Hilaire wrote: > Hi Pierce, > Yes, this option worked to key in Chinese. > > By the way, do you know if any option is needed on Windows? I checked > for the options but I did not see anything relevant: Hi Hilaire, My self-built VM on Windows 7 doesn't have the option either. But, multilingual input into Pharo works. Outside of Pharo, configure Windows multilingual input. Within Pharo, choose a font like Arial Unicode MS. Then just switch Windows input system using hot-key or mouse click, and type. See screenshot. Pierce

Feb. 22, 2019

Re: [Pharo-users] Pharo Object Serialization

by john pfersich

Thereâs also STON. See https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessf… /*âââââââââââââââââ-*/ Sent from my iPhone https://boincstats.com/signature/-1/user/51616339056/sig.png See https://objectnets.net and https://objectnets.org > On Feb 21, 2019, at 19:05, BrunoBB <smalltalk(a)adinet.com.uy> wrote: > > Hi, > > Which are the options for serialize objects in Pharo ? > > I know there is Fuel (https://rmod.inria.fr/web/software/Fuel) > > OmniBase is not supported any more. OmniBase was pretty cool even > transactional !!! > > What are you using ? (of course there is GemStone/S but i was not able to > convince my client yet :) > > regards, > bruno > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html >

Feb. 22, 2019

Pharo Object Serialization

by BrunoBB

Hi, Which are the options for serialize objects in Pharo ? I know there is Fuel (https://rmod.inria.fr/web/software/Fuel) OmniBase is not supported any more. OmniBase was pretty cool even transactional !!! What are you using ? (of course there is GemStone/S but i was not able to convince my client yet :) regards, bruno -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Feb. 22, 2019

Re: [Pharo-users] Iceberg Custom SSH Keys

by BrunoBB

Hi, We are still looking into this issue but we have everything configurated: <http://forum.world.st/file/t111409/iceberg-conf.png> If i can fix it i will post it here. regards bruno -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Feb. 22, 2019