Method: ActiveRecord::AttributeMethods#respond_to?

Defined in:
activerecord/lib/active_record/attribute_methods.rb

#respond_to?(name, include_private = false) ⇒ Boolean

A Person object with a name attribute can ask person.respond_to?(:name), person.respond_to?(:name=), and person.respond_to?(:name?) which will all return true. It also defines the attribute methods if they have not been generated.

class Person < ActiveRecord::Base
end

person = Person.new
person.respond_to?(:name)    # => true
person.respond_to?(:name=)   # => true
person.respond_to?(:name?)   # => true
person.respond_to?('age')    # => true
person.respond_to?('age=')   # => true
person.respond_to?('age?')   # => true
person.respond_to?(:nothing) # => false

Returns:

  • (Boolean) 


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# File 'activerecord/lib/active_record/attribute_methods.rb', line 291

def respond_to?(name, include_private = false)
  return false unless super

  # If the result is true then check for the select case.
  # For queries selecting a subset of columns, return false for unselected columns.
  if @attributes
    if name = self.class.symbol_column_to_string(name.to_sym)
      return _has_attribute?(name)
    end
  end

  true
end