how to adress specific data from related models?

I am newbie to cakephp and after some looking up in books and google I
need still help to start with cake...

I try to do my first application and am using several models linked to
tables and with relations between the models.

i.e.
model lodgings with the numberOfBeds
and a
model bookingpositions with lodging_id and amountOfPersons

If I want to check if there are enough beds in the room for the
persons,
i need to get the amountofbeds attribute for the lodging with the id
lodging_id
to pass the numberofbeds to my own validationfunction with the
amountOfPersons to check and validate or pass an errormessage.

Sadly I have no idea how to access the data posted from the model or
how to access the data of the linked model lodgings.

Could someone please help me with a bit of code?

I tried a print_r($data) and all the form values from the one model
are inside tha arary.
If i trie to access a value out of the array I fail to name the
index.
$data[amountofpersons] do not work and $data['amountofpersons'] do not
work, too.

And absolute no idea hot to get the numberofbeds from the linked model
sql might look like selct nubmerbofbeds from lodgings where id =
bookingpositions.lodging_id
but how to do it right with cake?????

Any help realy welcome!
Thanks in advance

Michael

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