Module: ActiveRecord::AttributeMethods::Read::ClassMethods

Defined in:
lib/active_record/attribute_methods/read.rb

Instance Method Summary collapse

Instance Method Details

#cache_attribute?(attr_name) ⇒ Boolean

Returns true if the provided attribute is being cached.

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/read.rb', line 29

def cache_attribute?(attr_name)
  cached_attributes.include?(attr_name)
end

#cache_attributes(*attribute_names) ⇒ Object

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).



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# File 'lib/active_record/attribute_methods/read.rb', line 18

def cache_attributes(*attribute_names)
  cached_attributes.merge attribute_names.map { |attr| attr.to_s }
end

#cached_attributes ⇒ Object

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



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# File 'lib/active_record/attribute_methods/read.rb', line 24

def cached_attributes
  @cached_attributes ||= columns.select { |c| cacheable_column?(c) }.map { |col| col.name }.to_set
end