hasMany(StudentValue::class, 'student_id'); } public function trainingDistanceCalculations() { return $this->hasMany(DistanceCalculation::class, 'training_data_id'); } public function testDistanceCalculations() { return $this->hasMany(DistanceCalculation::class, 'test_student_id'); } public function prediction() { return $this->hasOne(Prediction::class, 'test_student_id'); } }