Wikibase to Solr #2: item keys

To understand the Wikibase to Solr script, it is useful to first understand the Wikibase JSON structure and how it is interpreted inside Ruby.

Here is a simple program which loads the export.json file into a Ruby variable using the JSON library, and then iterates over each item.

Here we use item.keys to see what top-level keys are part of each item.

## import Ruby functions
require 'json'
require 'csv'
require 'date'
require 'time'
require 'optparse'

dir = File.dirname __FILE__
importJSONfile = File.expand_path 'export.json', dir

## Load the import JSON file into a Ruby array
data = JSON.load_file importJSONfile

data.each do |item|
   p item.keys
end

The output will look like this:

["type", "id", "labels", "descriptions", "aliases", "claims", "sitelinks", "lastrevid"]
["type", "id", "labels", "descriptions", "aliases", "claims", "sitelinks", "lastrevid"]
["type", "id", "labels", "descriptions", "aliases", "claims", "sitelinks", "lastrevid"]
["type", "id", "labels", "descriptions", "aliases", "claims", "sitelinks", "lastrevid"]