Bugfix: Use ActiveSupport.on_load to hook into ActiveRecord (#598)

* Use `ActiveSupport.on_load` to hook into ActiveRecord #588

Author: michaelrigart

lib/active_record/connection_adapters/sqlserver/core_ext/active_record.rb

@@ -24,4 +24,6 @@ def execute_procedure(proc_name, *variables)
   end
 end
 
-ActiveRecord::Base.send :include, ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::ActiveRecord
+ActiveSupport.on_load(:active_record) do
+  include ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::ActiveRecord
+end

lib/active_record/connection_adapters/sqlserver/core_ext/attribute_methods.rb

@@ -22,4 +22,6 @@ def attributes_for_update(attribute_names)
   end
 end
 
-ActiveRecord::Base.send :include, ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::AttributeMethods
+ActiveSupport.on_load(:active_record) do
+  include ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::AttributeMethods
+end

lib/active_record/connection_adapters/sqlserver/core_ext/explain.rb

@@ -43,5 +43,7 @@ def unprepare_sqlserver_statement(sql)
   end
 end
 
-ActiveRecord::Base.extend ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::Explain
-ActiveRecord::Relation.send :include, ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::Explain
+ActiveSupport.on_load(:active_record) do
+  extend ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::Explain
+  ActiveRecord::Relation.include(ActiveRecord::ConnectionAdapters::SQLServer::CoreExt::Explain)
+end

lib/active_record/connection_adapters/sqlserver/core_ext/explain_subscriber.rb

@@ -1,4 +1,6 @@
-silence_warnings do
-  # Already defined in Rails
-  ActiveRecord::ExplainSubscriber::EXPLAINED_SQLS = /(select|update|delete|insert)\b/i
+ActiveSupport.on_load(:active_record) do
+  silence_warnings do
+    # Already defined in Rails
+    ActiveRecord::ExplainSubscriber::EXPLAINED_SQLS = /(select|update|delete|insert)\b/i
+  end
 end