ruby activerecord easy one: call attribute by variable

Question

I want to update an attribute defined by a variable in an activerecord model.

This is my method

def increment_attribute(attr_name)
  self.attribute(attr_name).increment
end

This doesn't work because attribute is a private activerecord method

How should I do this? Thanks!

Answer 1

def increment_attribute(name)
  self.send(name).increment
end