Ruby on Rails

Hi
I have two models .
Dbase
--------
name
vendor
type
port
defuser - default user name

Users
-------
username
password
email

I need to build an association between these two in that the dbase
model's defuser needs to be present in the users table. I am from a
relational database background so am trying hard to understand rails
associations.
What should I do to associate the dbase's defuser - > users.username?
I read the documents and everything was based on the column 'id'.

Any help is appreciated.

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