Updating a row in the database

rubyonrails-talk
1

What's the difference between updating an entry in the database using the #save method and the #update method?

Thanks, Thomaz

2

A save made a check for see if the Object exist or not. If exist, the Object is save else, it's update.

With the #update, you must use a id who exist and define the attribute to update. And it's a public classe Method not instance method, so you use it only with Name class, not with your Object.

3

I'm coding a change password method in my application. When I use #update, a invalid password gets saved. The same doesn't happens with #save.

4

How use you update method ?