ModelObserver
A rails plugin to count the model object creations between each request, and help to find out the duplication.
Installation
Add to your Gemfile
group :development do
gem 'model_observer'
end
and bundle
bundle
Configuration
Initialize ModelObserver at config/environments/development.rb with the following code:
config.after_initialize do
ModelObserver.summary = true
ModelObserver.instantiation_log = true
end
Summary Log
The summary of each request will be appended to the end like this:
===== Model Observer Start =====
Author: 1 sum(10.6ms) avg(10.6ms)
Book: 27 sum(25.7ms) avg(1.0ms)
id(319): 3
id(377): 3
id(487): 3
id(489): 3
id(493): 3
id(496): 3
id(499): 3
id(507): 3
id(536): 3
===== Model Observer End =======
id(319): 3 means the models with same class(Book) and same id(319) have been instantiated three times.
Instantiation Log
The duration include query and instantiate models will be logged after each sql log like this:
Author Load (0.5ms) SELECT `authors`.* FROM `authors` WHERE `authors`.`id` = 1 LIMIT 1
Author Instantiate (1.5ms) SELECT `authors`.* FROM `authors` WHERE `authors`.`id` = 1 LIMIT 1
1.5ms == 0.5ms(DB query) + 1.0ms(model instantiation)