Module: Sequel::Plugins::AccessedColumns

Defined in:

lib/sequel/plugins/accessed_columns.rb

Overview

The accessed_columns plugin records which columns have been accessed for a model instance. This is useful if you are looking to remove other columns from being SELECTed by the dataset that retrieved the instance, which can significantly improve performance:

a = Album[1]
a.accessed_columns # []
a.name
a.accessed_columns # [:name]
a.artist_id
a.accessed_columns # [:name, :artist_id]

Note that this plugin should probably not be used in production, as it causes a performance hit.

Usage:

# Make all model subclass instances record accessed columns (called before loading subclasses)
Sequel::Model.plugin :accessed_columns

# Make the Album instances record accessed columns
Album.plugin :accessed_columns

Defined Under Namespace

Modules: InstanceMethods