Module: PreloadCounts

Defined in:
lib/preload_counts/ar.rb,
lib/preload_counts/version.rb

Overview

This adds a scope to preload the counts of an association in one SQL query.

Consider the following code: Service.all.each{|s| puts s.incidents.acknowledged.count}

Each time count is called, a db query is made to fetch the count.

Adding this to the Service class:

preload_counts :incidents => [:acknowledged]

will add a preload_incident_counts scope to preload the counts and add accessors to the class. So our codes becaumes

Service.preload_incident_counts.all.each{|s| puts s.acknowledged_incidents_count}

And only requires one DB query.

Defined Under Namespace

Modules: ClassMethods, InstanceMethods

Constant Summary collapse

VERSION = 
"0.0.4"

Class Method Summary collapse

Class Method Details

.included(receiver) ⇒ Object 



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# File 'lib/preload_counts/ar.rb', line 92

def self.included(receiver)
  receiver.extend ClassMethods
  receiver.send :include, InstanceMethods
end