module Sequel::Plugins::LazyAttributes::ClassMethods

Attributes

lazy_attributes_module[RW]

Module to store the lazy attribute getter methods, so they can be overridden and call super to get the lazy attribute behavior

Public Instance Methods

lazy_attributes(*attrs) click to toggle source

Remove the given attributes from the list of columns selected by default. For each attribute given, create an accessor method that allows a lazy lookup of the attribute. Each attribute should be given as a symbol.

# File lib/sequel/plugins/lazy_attributes.rb, line 46
def lazy_attributes(*attrs)
  unless select = dataset.opts[:select]
    select = dataset.columns.map{|c| Sequel.qualify(dataset.first_source, c)}
  end
  set_dataset(dataset.select(*select.reject{|c| attrs.include?(dataset.send(:_hash_key_symbol, c))}))
  attrs.each{|a| define_lazy_attribute_getter(a)}
end

Private Instance Methods

define_lazy_attribute_getter(a, opts=OPTS) click to toggle source

Add a lazy attribute getter method to the lazy_attributes_module. Options:

:dataset

The base dataset to use for the lazy attribute lookup

:table

The table name to use to qualify the attribute and primary key columns.

Calls superclass method
# File lib/sequel/plugins/lazy_attributes.rb, line 59
def define_lazy_attribute_getter(a, opts=OPTS)
  include(self.lazy_attributes_module ||= Module.new) unless lazy_attributes_module
  lazy_attributes_module.class_eval do
    define_method(a) do
      if !values.has_key?(a) && !new?
        lazy_attribute_lookup(a, opts)
      else
        super()
      end
    end
  end
end