class Player < ActiveRecord::Base validates_numericality_of :points - validates_numericality_of :games_played, :integer_only => true + validates_numericality_of :games_played, :only_integer => true end
The validates_size_of helper is an alias for validates_length_of.
This helper validates that your attributes have only numeric values. By default, it will match an optional sign followed by a integral or floating point number. Using the :integer_only option set to true, you can specify that only integral numbers are allowed.
If you set :integer_only to true, then it will use the /\A[+\-]?\d+\Z/+ regular expression to validate the attribute’s value. Otherwise, it will try to convert the value to a number using +Kernel.Float.
If you set :integer_only to true, then it will use the $$/\A[\-]?\d+\Z/ regular expression to validate the attribute’s value. Otherwise, it will try to convert the value to a number using +Kernel.Float.
class Player < ActiveRecord::Base validates_numericality_of :points - validates_numericality_of :games_played, :integer_only => true + validates_numericality_of :games_played, :only_integer => true end
Besides :only_integer, the validates_numericality_of helper also accepts the following options to add constraints to acceptable values:
Rails provides built-in helpers to display the error messages of your models in your view templates. It may be useful to display those messages when you’re trying to create or edit a record and validation fails. If you’re using the form_for helper to create a form, you can use it to call the error_messages method, which creates a div element containing all the error messages for the model associated with the form. Here is a simple example, using a Product model and the view template generated with the scaffold script.
Rails provides built-in helpers to display the error messages of your models in your view templates. When creating a form with the form_for helper, you can use the error_messages method on the form builder to render all failed validation messages for the current model instance.