How to update Activerrecord fields dynamiclly?

I need update some fields in activerecord model. But I'll ge开发者_StackOverflowt model and names/values of fields only at runntime. Some of the fields are the other models and associations has already set up.

The best solution I could come up with is:

fields.each do |key,val|
  model.send :"#{key}, val
end

Is there any other method?

Without save, attributes=:

model.attributes = fields

With save and validation, update_attributes:

model.update_attributes(fields)

fields.each do |key,val|
  model.update_attribute key, val
end

or

model.update_attributes fields