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ActiveRecord::AttributeMethods::Read::ClassMethods

Public Instance Methods

cache_attribute?(attr_name) click to toggle source

Returns true if the provided attribute is being cached.

# File lib/active_record/attribute_methods/read.rb, line 34
def cache_attribute?(attr_name)
  cached_attributes.include?(attr_name)
end
cache_attributes(*attribute_names) click to toggle source

cache_attributes allows you to declare which converted attribute values should be cached. Usually caching only pays off for attributes with expensive conversion methods, like time related columns (e.g. created_at, updated_at).

# File lib/active_record/attribute_methods/read.rb, line 22
def cache_attributes(*attribute_names)
  attribute_names.each {|attr| cached_attributes << attr.to_s}
end
cached_attributes() click to toggle source

Returns the attributes which are cached. By default time related columns with datatype :datetime, :timestamp, :time, :date are cached.

# File lib/active_record/attribute_methods/read.rb, line 28
def cached_attributes
  @cached_attributes ||=
    columns.select{|c| attribute_types_cached_by_default.include?(c.type)}.map{|col| col.name}.to_set
end

Protected Instance Methods

define_method_attribute(attr_name) click to toggle source
# File lib/active_record/attribute_methods/read.rb, line 39
def define_method_attribute(attr_name)
  if self.serialized_attributes[attr_name]
    define_read_method_for_serialized_attribute(attr_name)
  else
    define_read_method(attr_name.to_sym, attr_name, columns_hash[attr_name])
  end

  if attr_name == primary_key && attr_name != "id"
    define_read_method(:id, attr_name, columns_hash[attr_name])
  end
end

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