Module: Normatron::Filters::BlankFilter

Defined in:

lib/normatron/filters/blank_filter.rb

Class Method Summary

• .evaluate(input) ⇒ String^?

  Returns nil for a blank string or the string itself otherwise.

Class Method Details

.evaluate(input) ⇒ String^?

Returns nil for a blank string or the string itself otherwise.

Examples:

BlankFilter.evaluate("")            #=> nil
BlankFilter.evaluate("     ")       #=> nil
BlankFilter.evaluate("  \n ")       #=> nil
BlankFilter.evaluate("1")           #=> "1"
BlankFilter.evaluate("It's blank?") #=> "It's blank?"

Using as ActiveRecord::Base normalizer

normalize :attribute_a, :with => :blank
normalize :attribute_b, :with => [:custom_filter, :blank]

Parameters:

• input (String) —

  A character sequence

Returns:

• (String, nil) —

  The object itself or nil

See Also:

• String#blank?

# File 'lib/normatron/filters/blank_filter.rb', line 24

def self.evaluate(input)
  input.kind_of?(String) && input.blank? ? nil : input
end