{"id":1306,"date":"2014-04-14T00:24:38","date_gmt":"2014-04-13T23:24:38","guid":{"rendered":"https:\/\/www.entropywins.wtf\/blog\/?p=1306"},"modified":"2014-04-14T01:08:27","modified_gmt":"2014-04-14T00:08:27","slug":"wikibase-datamodel-0-7-3-released","status":"publish","type":"post","link":"https:\/\/www.entropywins.wtf\/blog\/2014\/04\/14\/wikibase-datamodel-0-7-3-released\/","title":{"rendered":"Wikibase DataModel 0.7.3 released"},"content":{"rendered":"

I am happy to announce the 0.7.3 release of Wikibase DataModel<\/a>.<\/p>\n

Wikibase DataModel<\/strong> is the canonical PHP implementation of the Data Model<\/a> at the heart of the Wikibase software<\/a>. It is primarily used by the Wikibase MediaWiki extensions, though has no dependencies whatsoever on these or on MediaWiki itself.<\/p>\n

This release contains a new API for working with labels, descriptions and terms, and it deprecates the old API for those.<\/p>\n

At the core of the new API<\/a> is a simple value object representing an until now unnamed domain concept: the part of an Item <\/em>or a Property<\/em> that has all those labels, descriptions and terms. The name we gave it is Fingerprint<\/em>. (Credits and blame for the name go to Lydia<\/a> :)) The Entity<\/em> class now has a getFingerprint<\/em> and a setFingerprint<\/em> method. Fingerprint<\/em><\/a> itself has getLabels<\/em>, getDescriptions<\/em> and getAliases<\/em> methods. The first two return a TermList<\/em>, which is made up from Term<\/em> objects. The later returns an AliasGroupList<\/em> which consists out of AliasGroup<\/em> objects.<\/p>\n

Why these changes? What was wrong with this approach?<\/p>\n

$entity->setLabels( array( 'en' => 'foo', 'de' => 'bar' ) );<\/pre>\n
The old API is defined by no less than 17 methods in Entity<\/em>. They add a lot of code to it, contributing to Entity<\/em> being the highest complexity class in DataModel. That our core (DDD) entity is also our most scary class is obviously not good. Moving the responsibility to a value object inside of Entity<\/em> is a clean way to tackle this problem, and is also more in line with how the other parts of Entities<\/em>, such as they list of Claims<\/em> are handled. On top of the complexity issue, the old API also does badly interface segregation wise. Most code dealing with Terms (ie Labels<\/em>, Descriptions<\/em> and Aliases<\/em>) will not care about all the rest of Entity<\/em>. Hence it makes no sense to have to feed it an entire Entity<\/em> object while a Fingerprint<\/em> or one of its composited in objects would make more sense.<\/p>\n
\"dm-complexity\"<\/a><\/p>\n
Another important reason to move into this direction is that I want to see Entity<\/em> go. If you are familiar with the project, this might seem like a quite preposterous statement. Kill Entity<\/em>? How can I possibly think that is a good idea, and how will the code be able to still work afterwards? In short, Entity<\/em> tries to unify things that are quite different in a single class hierarchy. The difference between those objects creates creates a lot of weirdness. Entity<\/em> contains a list of Claim<\/em>, while Item<\/em>, one of it’s derivatives, requires a list of Statement<\/em>, Statement<\/em> being a derivative of Claim<\/em>. And not all Entities<\/em> we foresee will have Claims<\/em>, Fingerprint<\/em>, etc. The only thing they will all have is an EntityId<\/em>, and all we need to facilitate that is a simple HasEntityId<\/em> interface. All the rest, including the Fingerprint<\/em>, can be composited in by classes such as Item<\/em> and Property<\/em> that implement the appropriate interfaces. Those changes are for the next big release, so if you are using DataModel, it is recommended you switch to using the new Fingerprint<\/em> API as soon as possible.<\/p>\n
And I’m still done with the list – wow<\/a>. A final reason for the change is that the old API was not only ugly (weird function signatures in places), it was also quite inconsistent in its implementation. It has TODOs in there since the start of the project that state things such as “figure out if we care about duplicates” and “are empty strings valid?”. The new implementation properly takes care of these things, and does no in all cases where it should rather than only in assorted random functions. That those old TODOs remained there for nearly two years go to show how likely it is people “go back to fix it”.<\/p>\n
You can do everything you could do with the old implementation with the new one. There are however some things that might be slightly more cumbersome for now, especially in code that is taking in entire Entity objects while only needing a Fingerprint. As we migrate to the new implementation, it will become clear what convince functions will pay for themselves, so those will likely be added in the near future. At the same time several tasks are already easier to do now. The new value objects will also likely provide a good place to put functionality that was oddly places before.<\/p>\n
For a list of changes, see the release notes<\/a>.<\/p>\n
And in anticipation of the next release, have some WMDE kittens:<\/p>\n
\"2014-04-14<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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This is the first real release of this component. DataModel? Wikibase is the software behind Wikidata.org. At its core, this software is about describing entities. Entities are collections of claims, which can have qualifiers, references and values of various different\u2026","rel":"","context":"In \"Component\"","block_context":{"text":"Component","link":"https:\/\/www.entropywins.wtf\/blog\/tag\/component\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1453,"url":"https:\/\/www.entropywins.wtf\/blog\/2015\/08\/11\/wikibase-datamodel-services\/","url_meta":{"origin":1306,"position":1},"title":"Wikibase DataModel Services","author":"Jeroen","date":"2015-08-11","format":false,"excerpt":"I'm happy to announce the immediate availability of a new Wikibase library: Wikibase DataModel Services (which I'll in this blog post refer to as DMS). Rationale behind the library The main motivation for introducing this new library is to reduce technical debt and draw more solid architectural boundaries in the\u2026","rel":"","context":"In "Programming"","block_context":{"text":"Programming","link":"https:\/\/www.entropywins.wtf\/blog\/category\/programming\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1401,"url":"https:\/\/www.entropywins.wtf\/blog\/2014\/09\/02\/wikibase-datamodel-1-0\/","url_meta":{"origin":1306,"position":2},"title":"Wikibase DataModel 1.0","author":"Jeroen","date":"2014-09-02","format":false,"excerpt":"I'm happy to announce the 1.0 release of Wikibase DataModel.\u00a0Wikibase DataModel is the canonical PHP implementation of the Data Model at the heart of the Wikibase software. This is a big release which has been some time in the making, even though many additions have been split of and included\u2026","rel":"","context":"In "Programming"","block_context":{"text":"Programming","link":"https:\/\/www.entropywins.wtf\/blog\/category\/programming\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1327,"url":"https:\/\/www.entropywins.wtf\/blog\/2014\/04\/30\/wikibase-datamodel-entity-v2\/","url_meta":{"origin":1306,"position":3},"title":"Wikibase DataModel: Entity v2","author":"Jeroen","date":"2014-04-30","format":false,"excerpt":"In a recent blog post I introduced the new Term classes introduced in Wikibase DataModel 0.7.3. It also outlined plans for making some big changes to the Entity class and it's derivatives. We have now taken the most difficult step in the process, which is already resulting in much nicer\u2026","rel":"","context":"In "Programming"","block_context":{"text":"Programming","link":"https:\/\/www.entropywins.wtf\/blog\/category\/programming\/"},"img":{"alt_text":"dm-complexity","src":"https:\/\/i0.wp.com\/www.entropywins.wtf\/blog\/wp-content\/uploads\/2014\/04\/dm-complexity.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":1524,"url":"https:\/\/www.entropywins.wtf\/blog\/2016\/01\/25\/replicator-a-cli-tool-for-wikidata\/","url_meta":{"origin":1306,"position":4},"title":"Replicator: Wikidata import tool","author":"Jeroen","date":"2016-01-25","format":false,"excerpt":"I'm happy to announce the first release of Replicator, a CLI tool for importing entities from Wikidata. Replicator was created for importing data from Wikidata into the QueryR REST API persistence. 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