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# File 'lib/lazy_attributes.rb', line 23
def attr_lazy(*attrs)
return unless table_exists?
normalized_attrs = attrs.map { |a| a.to_s }
self.lazy_attributes += normalized_attrs
self.eager_attributes = (column_names - lazy_attributes)
self.eager_attributes_quoted = eager_attributes.map { |a| connection.quote_column_name(a) }
normalized_attrs.each do |attr|
define_method attr do
write_attribute(attr, connection.select_value('SELECT %s FROM %s WHERE %s = %s' % [connection.quote_column_name(attr), self.class.quoted_table_name, self.class.primary_key, quoted_id])) unless has_attribute?(attr)
read_attribute(attr)
end
define_method "#{attr}?" do
if new_record? || has_attribute?(attr)
!!send(attr)
else
self.class.exists? ["#{self.class.primary_key} = ? AND #{connection.quote_column_name(attr)} IS NOT NULL", id]
end
end
end
end
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