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Sequel::Plugins::LazyAttributes

The lazy_attributes plugin allows users to easily set that some attributes should not be loaded by default when loading model objects. If the attribute is needed after the instance has been retrieved, a database query is made to retreive the value of the attribute.

This plugin depends on the tactical_eager_loading plugin, and allows you to eagerly load lazy attributes for all objects retrieved with the current object. So the following code should issue one query to get the albums and one query to get the reviews for all of those albums:

Album.plugin :lazy_attributes, :review
Sequel::Model.with_identity_map do
  Album.filter{id<100}.all do |a|
    a.review
  end
end

# You can specify multiple columns to lazily load:
Album.plugin :lazy_attributes, :review, :tracklist

Public Class Methods

apply(model, *attrs) click to toggle source

Lazy attributes requires the tactical_eager_loading plugin

# File lib/sequel/plugins/lazy_attributes.rb, line 24
def self.apply(model, *attrs)
  model.plugin :tactical_eager_loading  
end
configure(model, *attrs) click to toggle source

Set the attributes given as lazy attributes

# File lib/sequel/plugins/lazy_attributes.rb, line 29
def self.configure(model, *attrs)
  model.lazy_attributes(*attrs) unless attrs.empty?
end

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