validates_format_of(*attr_names) Instance Public methods Validates whether the value of the specified attribute is of the correct form, going by the regular expression provided.You can require that the attribute matches the regular expression: class Person < ActiveRecord::Base validates_format_of :email, with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i, on: :create end Alternatively, you can require that the specified attribute does not match the regular expression: class

Readline.get_screen_size â [rows, columns] Class Public methods Returns the terminal's rows and columns. See GNU Readline's rl_get_screen_size function. Raises NotImplementedError if the using readline library does not support. Raises SecurityError exception if $SAFE is 4.

item_create(keys={}) Instance Public methods

size() Instance Public methods Returns the size of the collection. If the collection hasn't been loaded, it executes a SELECT COUNT(*) query. Else it calls collection.size. If the collection has been already loaded size and length are equivalent. If not and you are going to need the records anyway length will take one less query. Otherwise size is more efficient. class Person < ActiveRecord::Base has_many :pets end person.pets.size # => 3 # executes something like SELECT C

clear() Instance Public methods

lookup_ancestors() Instance Public methods When localizing a string, it goes through the lookup returned by this method, which is used in ActiveModel::Name#human, ActiveModel::Errors#full_messages and #human_attribute_name.

get_option() Instance Public methods `get_option' is an alias of `get'. get

encoding() Instance Public methods The external encoding for standard input.

yaxis_use(target=nil) Instance Public methods

tag(intv_p = false, relname=nil) Instance Public methods