const repository = new Realm({
 schema: [
        {
            name: 'Patient',
            primaryKey: 'patient_id',
            properties: {
                patient_id: 'string',
                firstname: 'string?',
                regularMedications: 'RegularMedications[]',
            },
        },
     {
            name: 'RegularMedications',
            primaryKey: 'med_id',
            properties: {
                patient_id: 'string?',
                med_id: 'string?',
                medication: 'string?',
            },

        },
]
})

    try {
                repository.write(() => {
                    let mmgo = repository.create('Patient', {
                        patient_id: params.Patient.patient_id,
                        firstname: params.Patient.firstname,
                        regularMedications: [],
                    })
                    params.RegularMedications.forEach(ele => {
                        mmgo.regularMedications.push({
                            patient_id: params.Patient.patient_id,
                            med_id: ele.med_id,
                            medication: ele.medication
                        })
                    })
} catch(..) {}

 const query = repository.objects('Patient').filtered("patient_id = '" + fromId + "'");
 repository.write(() => { repository.delete(query); });