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

### Home Classes Methods

### In Files

- lib/active_record/attribute_methods/read.rb

### Methods

- #cache_attribute?
- #cache_attributes
- #cached_attributes
- #define_method_attribute

### Files

- README.rdoc

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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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