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module ActiveRecord::AttributeMethods::Read::ClassMethods

Public Instance Methods

cache_attribute?(attr_name) Show source

Returns true if the provided attribute is being cached.

# File activerecord/lib/active_record/attribute_methods/read.rb, line 61
def cache_attribute?(attr_name)
  cached_attributes.include?(attr_name)
end
cache_attributes(*attribute_names) Show 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 activerecord/lib/active_record/attribute_methods/read.rb, line 50
def cache_attributes(*attribute_names)
  cached_attributes.merge attribute_names.map { |attr| attr.to_s }
end
cached_attributes() Show source

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

# File activerecord/lib/active_record/attribute_methods/read.rb, line 56
def cached_attributes
  @cached_attributes ||= columns.select { |c| cacheable_column?(c) }.map { |col| col.name }.to_set
end

Protected Instance Methods

define_method_attribute(name) Show source 
# File activerecord/lib/active_record/attribute_methods/read.rb, line 68
def define_method_attribute(name)
  method = ReaderMethodCache[name]
  generated_attribute_methods.module_eval { define_method name, method }
end

© 2004–2016 David Heinemeier Hansson
Licensed under the MIT License.