How can I make a property aware of changes on another?

Rails
1

I have a model that needs to update a property whenever another property
changes, i.e. changing the model ‘type’ property updates the
‘description’ property with another value.
I don’t know how to get access to the underlying fields handled by rails
within a model class.

Thanks,

Daniel

2

Hello Daniel,
It sounds like you are looking for the magic that makes the Observer
design pattern happen. In Ruby this is done using the Observable module.
Example code here ;

FYI, I have NOT tried this under rails, but, I would be intrigued to

hear how you get along with it. Let us all know how it goes :wink:
Regards
Stef