ruby on rails - Accessing an instance method in an active record query -

given following 2 models:

class wheel   belongs_to :car    def self.flat     where(flat: true)   end

and

class car   has_many :wheels    def flats     self.wheels.flat   end    def has_flats?     flats.count > 0   end

i need query cars flat tires. i'm wondering why isn't working in cars model?:

def self.with_flats   where(:has_flats?) end

def self.with_flats   where(:has_flats? == true) end

this isn't returning correct records. ideas?

define scope in car model:

class car   has_many :wheels    scope :having_flat_wheels, joins(:wheels).where("wheels.flat=?", true).uniq   ...... end

then cars flat tires:

car.having_flat_wheels

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