[MODEL] Expanded the example for indexing and searching ActiveRecord associations

The example did a good job for demonstrating how to set up relationships between
models and how to index the "core" model, but it didn't really demonstrated
the difference between the `records` and `results` of the response.

Related: #586

Author: karmi

elasticsearch-model/examples/activerecord_associations.rb

@@ -12,12 +12,12 @@
 $LOAD_PATH.unshift File.expand_path('../../lib', __FILE__)
 
 require 'pry'
-Pry.config.history.file = File.expand_path('../../tmp/elasticsearch_development.pry', __FILE__)
 
 require 'logger'
 require 'ansi/core'
 require 'active_record'
 
+require 'json'
 require 'elasticsearch/model'
 
 ActiveRecord::Base.logger = ActiveSupport::Logger.new(STDOUT)
@@ -63,7 +63,7 @@
 # ----- Elasticsearch client setup ----------------------------------------------------------------
 
 Elasticsearch::Model.client = Elasticsearch::Client.new log: true
-Elasticsearch::Model.client.transport.logger.formatter = proc { |s, d, p, m| "\e[32m#{m}\n\e[0m" }
+Elasticsearch::Model.client.transport.logger.formatter = proc { |s, d, p, m| "\e[2m#{m}\n\e[0m" }
 
 # ----- Search integration ------------------------------------------------------------------------
 
@@ -161,18 +161,43 @@ class Comment < ActiveRecord::Base
 
 Elasticsearch::Model.client.indices.refresh index: Elasticsearch::Model::Registry.all.map(&:index_name)
 
-puts "\n\e[1mArticles containing 'one':\e[0m", Article.search('one').records.to_a.map(&:inspect), ""
+# Search for a term and return records
+#
+puts "",
+     "Articles containing 'one':".ansi(:bold),
+     Article.search('one').records.to_a.map(&:inspect),
+     ""
 
-puts "\n\e[1mModels containing 'one':\e[0m", Elasticsearch::Model.search('one').records.to_a.map(&:inspect), ""
+puts "",
+     "All Models containing 'one':".ansi(:bold),
+     Elasticsearch::Model.search('one').records.to_a.map(&:inspect),
+     ""
 
-# Load model
+# Difference between `records` and `results`
 #
-article = Article.all.includes(:categories, :authors, :comments).first
+response = Article.search query: { match: { title: 'first' } }
 
-# ----- Pry ---------------------------------------------------------------------------------------
+puts "",
+     "Search results are wrapped in the <#{response.class}> class",
+     ""
+
+puts "",
+     "Access the <ActiveRecord> instances with the `#records` method:".ansi(:bold),
+     response.records.map { |r| "* #{r.title} | Authors: #{r.authors.map(&:full_name) } | Comment count: #{r.comments.size}" }.join("\n"),
+     ""
 
-puts '', '-'*Pry::Terminal.width!
+puts "",
+     "Access the Elasticsearch documents with the `#results` method (without touching the database):".ansi(:bold),
+     response.results.map { |r| "* #{r.title} | Authors: #{r.authors.map(&:full_name) } | Comment count: #{r.comments.size}" }.join("\n"),
+     ""
+
+puts "",
+     "The indexed document:".ansi(:bold),
+     JSON.pretty_generate(response.results.first._source.to_hash),
+     ""
+
+# ----- Pry ---------------------------------------------------------------------------------------
 
 Pry.start(binding, prompt: lambda { |obj, nest_level, _| '> ' },
-                   input: StringIO.new("article.as_indexed_json\n"),
+                   input: StringIO.new('response.records.first'),
                    quiet: true)