[MODEL] Added a full example with mapping for the completion suggester

Related: elastic#429

Author: karmi

elasticsearch-model/examples/activerecord_mapping_completion.rb

@@ -0,0 +1,69 @@
+require 'ansi'
+require 'active_record'
+require 'elasticsearch/model'
+
+ActiveRecord::Base.logger = ActiveSupport::Logger.new(STDOUT)
+ActiveRecord::Base.establish_connection( adapter: 'sqlite3', database: ":memory:" )
+
+ActiveRecord::Schema.define(version: 1) do
+  create_table :articles do |t|
+    t.string :title
+    t.date   :published_at
+    t.timestamps
+  end
+end
+
+class Article < ActiveRecord::Base
+  include Elasticsearch::Model
+  include Elasticsearch::Model::Callbacks
+
+  mapping do
+    indexes :title
+    indexes :title_suggest, type: 'completion', payloads: true
+  end
+
+  def as_indexed_json(options={})
+    as_json.merge \
+    title_suggest: {
+      input:  title,
+      output: title,
+      payload: { url: "/articles/#{id}" }
+    }
+  end
+end
+
+Article.__elasticsearch__.client = Elasticsearch::Client.new log: true
+
+# Create index
+
+Article.__elasticsearch__.create_index! force: true
+
+# Store data
+
+Article.delete_all
+Article.create title: 'Foo'
+Article.create title: 'Bar'
+Article.create title: 'Foo Foo'
+Article.__elasticsearch__.refresh_index!
+
+# Search and suggest
+
+response_1 = Article.search 'foo';
+
+puts "Article search:".ansi(:bold),
+     response_1.to_a.map { |d| "Title: #{d.title}" }.inspect.ansi(:bold, :yellow)
+
+response_2 = Article.__elasticsearch__.client.suggest \
+  index: Article.index_name,
+  body: {
+    articles: {
+      text: 'foo',
+      completion: { field: 'title_suggest', size: 25 }
+    }
+  };
+
+puts "Article suggest:".ansi(:bold),
+     response_2['articles'].first['options'].map { |d| "#{d['text']} -> #{d['payload']['url']}" }.
+     inspect.ansi(:bold, :green)
+
+require 'pry'; binding.pry;