Module: ActiveRecord::AttributeMethods::Read

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

Instance Method Summary collapse

Instance Method Details

#read_attribute(attr_name) ⇒ Object 



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# File 'lib/composite_primary_keys/attribute_methods/read.rb', line 4

def read_attribute(attr_name)
  if attr_name.kind_of?(Array)
    attr_name.map {|name| read_attribute(name)}.to_composite_keys
  else
    # If it's cached, just return it
    # We use #[] first as a perf optimization for non-nil values. See https://gist.github.com/jonleighton/3552829.
    name = attr_name.to_s
    @attributes_cache[name] || @attributes_cache.fetch(name) {
      column = @column_types_override[name] if @column_types_override
      column ||= @column_types[name]

      return @attributes.fetch(name) {
        if name == 'id' && self.class.primary_key != name
          read_attribute(self.class.primary_key)
        end
      } unless column

      value = @attributes.fetch(name) {
        return block_given? ? yield(name) : nil
      }

      if self.class.cache_attribute?(name)
        @attributes_cache[name] = column.type_cast(value)
      else
        column.type_cast value
      end
    }
  end
end