method

respond_to?

v7.1.3.4 - Show latest stable - 0 notes - Class: ActiveRecord::AttributeMethods

respond_to?(name, include_private = false) public

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

Show source

# File activerecord/lib/active_record/attribute_methods.rb, line 286
    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.
      # We check defined?(@attributes) not to issue warnings if called on objects that
      # have been allocated but not yet initialized.
      if defined?(@attributes)
        if name = self.class.symbol_column_to_string(name.to_sym)
          return _has_attribute?(name)
        end
      end

      true
    end

respond_to?

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