[MODEL] Use ::ActiveRecord::VERSION::MAJOR to check for version

Author: karmi

elasticsearch-model/lib/elasticsearch/model/adapters/active_record.rb

@@ -20,7 +20,7 @@ def records
             #
             sql_records.instance_exec(response['hits']['hits']) do |hits|
               define_singleton_method :to_a do
-                if ::ActiveRecord.respond_to?(:version) && ::ActiveRecord.version.to_s > '4'
+                if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
                   self.load
                 else
                   self.__send__(:exec_queries)
@@ -47,7 +47,7 @@ def order(*args)
             #
             sql_records.instance_exec do
               define_singleton_method(:to_a) do
-                if ::ActiveRecord.respond_to?(:version) && ::ActiveRecord.version.to_s > '4'
+                if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
                   self.load
                 else
                   self.__send__(:exec_queries)

elasticsearch-model/test/integration/active_record_associations_test.rb

@@ -230,7 +230,7 @@ class ActiveRecordAssociationsIntegrationTest < Elasticsearch::Test::Integration
 
           assert_equal 3, response.results.size
           assert_equal 3, response.records.size
-        end if ::ActiveRecord.respond_to?(:version) && ::ActiveRecord.version.to_s > '4'
+        end if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
 
         should "reindex a document after comments are added" do
           # Create posts
@@ -272,7 +272,7 @@ class ActiveRecordAssociationsIntegrationTest < Elasticsearch::Test::Integration
             }
 
           assert_equal 1, response.results.size
-        end if ::ActiveRecord.respond_to?(:version) && ::ActiveRecord.version.to_s > '4'
+        end if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
 
         should "reindex a document after Post#touch" do
           # Create categories

elasticsearch-model/test/integration/active_record_basic_test.rb

@@ -126,7 +126,7 @@ class ::Article < ActiveRecord::Base
         should "allow ordering response.records in SQL" do
           response = Article.search query: { match: { title: { query: 'test' } } }
 
-          if ::ActiveRecord.respond_to?(:version) && ::ActiveRecord.version.to_s > '4'
+          if defined?(::ActiveRecord) && ::ActiveRecord::VERSION::MAJOR >= 4
             assert_equal 'Testing Coding', response.records.order(title: :desc).first.title
           else
             assert_equal 'Testing Coding', response.records.order('title DESC').first.title