how to use counterquery in cakephp

Hi

i need help understanding counterquery

i know right now cakephp allows me to store children count in parent
table

eg a Car hasMany Wheel

so in cars table, there is a wheels_count column.

but i only want to store the wheel associated with a particular car
AND has a status as 'active'.

Meaning, if 5 Wheel records belong to a Car with id = 17, but of these
5 only 3 of them have a Wheel.status = 'active', then the
Car.wheels_count for id 17 is 3.

so apparently counterquery helps me to do this?

Please enlighten me.

Thank you.

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