method
has_attribute?
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Class: ActiveRecord::AttributeMethods
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has_attribute?(attr_name)
public
Returns true if the given attribute is in the attributes hash, otherwise false.
class Person < ActiveRecord::Base alias_attribute :new_name, :name end person = Person.new person.has_attribute?(:name) # => true person.has_attribute?(:new_name) # => true person.has_attribute?('age') # => true person.has_attribute?(:nothing) # => false