xmlschema() Instance Public methods

structure_load(*arguments) Instance Public methods

new(lookup_context) Class Public methods

length() Instance Public methods

sum(identity = 0, &block) Instance Public methods Calculates a sum from the elements. payments.sum { |p| p.price * p.tax_rate } payments.sum(&:price) The latter is a shortcut for: payments.inject(0) { |sum, p| sum + p.price } It can also calculate the sum without the use of a block. [5, 15, 10].sum # => 30 ['foo', 'bar'].sum # => "foobar" [[1, 2], [3, 1, 5]].sum => [1, 2, 3, 1, 5] The default sum of an empty list is zero. You can override this default: [].sum(Pay

new() Class Public methods

eager_load_paths() Instance Public methods

supports_primary_key?() Instance Public methods

escape_glob_chars(path) Instance Public methods

empty?() Instance Public methods Returns true if the collection is empty. If the collection has been loaded it is equivalent to collection.size.zero?. If the collection has not been loaded, it is equivalent to collection.exists?. If the collection has not already been loaded and you are going to fetch the records anyway it is better to check collection.length.zero?. class Person < ActiveRecord::Base has_many :pets end person.pets.count # => 1 person.pets.empty? # => fa