activerecord - Using method in a where clause Rails Ruby Active Record -

i wondering if posible use model instance method clause query. mean. have model school method defined

class school < activerecord::base    def my_method     users.where(blablabla).present?   end  end

is posible like:

school.all.where(my_method: true)

i know can like:

school.all.map{|x| x if x.my_method}

but way has huge penalization in performance compared query. furthermore, return of i'm searching activerecord relation , map returns array.

update:

also there way like:

school.all.joins(:users).where("users.attribute = something")

but not fit want several reasons.

thanks in advance

i don't know relations between models.

but clause gets hash of key - value. can example return id's of users in kind of hash , use it.

def my_method   {user_id: users.where(blablabla).ids} end

and use it:

school.all.where(my_method)

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