Wikidata API Client

Wikidata client library for Ruby.

It provide an easy way to search for wikidata and wikipedia pages and read their contents.

Installation

In bundler: gem 'wikidata-client', '~> 0.0.10', require: 'wikidata'

Otherwise: gem install wikidata-client

Configuration

Only one thing is configurable for now, the HTTP client and its options, via faraday:

Wikidata.configure do |config|
  config.options = {
    request: {
      timeout: 10,
      open_timeout: 2
    }
  }
  config.adapter = :excon
end

Usage

Search

> search = Wikidata::Item.search 'Homer Simpson'
=> <Wikidata::SearchResponse results: [
     <Wikidata::Item id: Q7810, title: "Homer Simpson">,
     <Wikidata::Item id: Q3577370, title: "Homer Simpson, This Is Your Wife">,
     <Wikidata::Item id: Q2082128, title: "Homer Simpson in: "Kidney Trouble">,
     <Wikidata::Item id: Q2715733, title: "Politically Inept, with Homer Simpson">,
     <Wikidata::Item id: Q1626047, title: "The City of New York vs. Homer Simpson">,
     <Wikidata::Item id: Q5966549, title: "Q5966549">,
     <Wikidata::Item id: Q15162647, title: "Being Homer Simpson">,
     <Wikidata::Item id: Q17653635, title: "'Homer Simpson' contributes to U.S. presidential candidate Buddy Roemer">,
     <Wikidata::Item id: Q17713638, title: "Q17713638">,
     <Wikidata::Item id: Q2751406, title: "Q2751406">
   ]>

> search.empty?
=> false

> search.results.first.labels['en'].value
=> "Homer Simpson"

> search.total_hits
=> 119

> search.next_page_offset
=> 10

Find by ids or titles

> homer = Wikidata::Item.find_by_title 'Homer Simpson' # Same as homer = Wikidata::Item.find 'Q7810'
=> <Wikidata::Item id: Q7810, title: "Homer Simpson">

> homer.children
=> [<Wikidata::Item id: Q5480, title: "Bart Simpson">, <Wikidata::Item id: Q5846, title: "Lisa Simpson">, <Wikidata::Item id: Q7834, title: "Maggie Simpson">]

> homer.date_of_birth.date
=> #<DateTime: 1956-06-18T00:00:00+00:00 ((2435643j,0s,0n),+0s,2299161j)>

If you want several pages at the same time, just give an array to find or find_by_title methods:

> Wikidata::Item.find_by_title ['Sid Vicious', 'John Lydon']
=> <Wikidata::Response results: [
     <Wikidata::Item id: Q47878, title: "Sid Vicious">,
     <Wikidata::Item id: Q106662, title: "John Lydon">
   ]>

> Wikidata::Item.find ['Q47878', 'Q106662']
=> <Wikidata::Response results: [
     <Wikidata::Item id: Q47878, title: "Sid Vicious">,
     <Wikidata::Item id: Q106662, title: "John Lydon">
   ]>

Properties

To access an item property, use the Wikidata property code and one of these methods:

properties: to get all properties
property: to get the first property

> homer = Wikidata::Item.find_by_title 'Homer Simpson'

=> <Wikidata::Item id: Q7810, title: "Homer Simpson">

> homer.properties('P40')
=> [
     <Wikidata::Item id: Q5480, title: "Bart Simpson">,
     <Wikidata::Item id: Q5846, title: "Lisa Simpson">,
     <Wikidata::Item id: Q7834, title: "Maggie Simpson">
   ]

> homer.property('P22')
=> <Wikidata::Item id: Q842104, title: "Grampa Simpson">

Alternatively, you can map wikidata property codes to method names, see https://github.com/klacointe/wikidata-client/blob/master/config/mapping.yml to get the list of mapped properties.

If you define the mapping under the resources section, accessor will be on the first property only. If under the collections sections, all properties will be returned:

> homer = Wikidata::Item.find_by_title 'Homer Simpson'

=> <Wikidata::Item id: Q7810, title: "Homer Simpson">

> homer.children
=> [
     <Wikidata::Item id: Q5480, title: "Bart Simpson">,
     <Wikidata::Item id: Q5846, title: "Lisa Simpson">,
     <Wikidata::Item id: Q7834, title: "Maggie Simpson">
   ]

> homer.father
=> <Wikidata::Item id: Q842104, title: "Grampa Simpson">

Feel free to add yours in a topic branch and seed me a pull request.

Finally of you want to get only ids of properties to avoid making several unecessary requests, you can use these methods: property_id and property_ids:

> homer = Wikidata::Item.find_by_title 'Homer Simpson'

=> <Wikidata::Item id: Q7810, title: "Homer Simpson">

> homer.property_ids('P40')
=> ["Q5480", "Q5846", "Q7834"]

> homer.property_id('P22')
=> "Q842104"

Note on Patches/Pull Requests

Fork the project.
Make your feature addition or bug fix.
Add tests for it. This is important so I don't break it in a future version unintentionally.
Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself in another branch so I can ignore when I pull)
Send me a pull request. Bonus points for topic branches.

Copyright

MIT. See LICENSE for further details.

wikidata-client

Development

Runtime