webget_ruby_freebase

Install

  gem sources --add http://webget.com
  gem install webget_ruby_freebase

Example

  require 'rubygems'
  require 'freebase'
  require 'pp'

  query = '{"id":"/en/china","capital":null,"type":"/location/country"}'

  pp Freebase.read(query)
  #=> {"id"=>"/en/china", "type"=>"/location/country", "capital"=>"Beijing"}

  pp Freebase.read(query)['capital']
  #=> "Beijing"

Example of multiple queries

  query1 = '{"id":"/en/india","capital":null,"type":"/location/country"}'
  query2 = '{"id":"/en/japan","capital":null,"type":"/location/country"}'

  pp Freebase.read(query1,query2)
  #=> [{"id"=>"/en/india", "type"=>"/location/country", "capital"=>"New Delhi"},
  #    {"id"=>"/en/japan", "type"=>"/location/country", "capital"=>"Tokyo"}]

  pp Freebase.read(query1,query2).map{|result| result['capital']}
  #=> ["New Delhi","Tokyo"]

Name Query

Example

  query = Freebase.name_query('Cher')
  #=>  {"/type/reflect/any_value"=>[{
           "lang"=>"/lang/en",
           "link|="=>
             [
               "/type/object/name",
               "/common/topic/alias"
             ],
           "type"=>"/type/text",
           "value"=>"cher"
         }],
         "t1:type"=>"/people/person",
         "t2:type"=>"/common/topic",
         "t3:type"=>{
           "name"=>"/people/deceased_person",
           "optional"=>"optional"
         },
         "id"=>"null"
       }

Example of finding a person’s id

  Freebase.read(Freebase.name_query('Cher'))['id']
  #=> "/en/cher"

Query Formats

You can provide a query as a JSON string or as a Hash.

The query methods will convert:

• a Hash to a JSON string e.g. {:foo=>’bar’} to ’{“foo”:“bar”}
• a nil value to the freebase ‘null’ string e.g. {:foo=>nil} to {“foo”:null}
• anything else: we call to_s then to_json