2 foreign keys to same model?

Hi, cake1.2 here,

I have a question on how to set this database up by cake's convention.
I have the following 2 tables:

users
assets

each user has many assets, but users can allow other users to access
their assets
so I figure the following, a third table is needed:

a table that has attributes:
owner, allowed

they both point to users_id, how do I make this table model in
cakephp? Is there another way to do this?
Because i know users_id means foreign key to table users, but how do
you have 2 foreign to the same table?

thank you

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