How to create a record in multiple tables in peewee? - mysql

Question

my knowledge about database driven app and database ORM is wee, I have written this model in peewee https://codereview.stackexchange.com/q/210293/22943
and I want to be able to update the 3 tables Patient, Relative and PatientAttendOnVisit at the same time with Relative and PatientAttendOnVisit foreign key to Patient ID in Patient table.
I tried straight forward:
def add_patient_visit(data=None):
"""
Adds new visit to clinic of patient
for new or follow up patient.
"""
if not data:
raise ValueError("Please pass the user info.")
try:
patient = _clinic.Patient.get(name=data["name"])
if patient:
print "Patient exists with same name."
response_object = {
"status": "fail",
"message": "Patient already in record."
}
return response_object, 400
except peewee.DoesNotExist as er:
patient = _clinic.Patient.create(
name=data["name"],
townCity=data["townCity"],
contactnumber=data["contactnumber"],
age=data["age"],
gender=data["gender"],
email=data["email"],
postalAddress=data["postalAddress"])
relative = _clinic.Relative.create(relation=data["relation"],
relativeName=data["relativeName"])
attendence = _clinic.PatientAttendOnVisit.create(
dateTimeofvisit=data["dateTimeofvisit"],
attendtype=data["attendtype"],
department=data["department"]
)
but attempting to do so give me below error:
return controller.add_patient_visit(data=data) File
"/Users/ciasto/Development/python/clinic-backend/app/api/clinic/controller.py",
line 35, in add_patient_visit
relativeName=data["relativeName"]) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 5580, in create
inst.save(force_insert=True) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 5727, in save
pk_from_cursor = self.insert(**field_dict).execute() File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 1622, in inner
return method(self, database, *args, **kwargs) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 1693, in execute
return self._execute(database) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 2355, in _execute
return super(Insert, self)._execute(database) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 2118, in _execute
cursor = database.execute(self) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 2724, in execute
return self.execute_sql(sql, params, commit=commit) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 2718, in execute_sql
self.commit() File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 2509, in exit
reraise(new_type, new_type(*exc_args), traceback) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/peewee.py",
line 2711, in execute_sql
cursor.execute(sql, params or ()) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/MySQLdb/cursors.py",
line 205, in execute
self.errorhandler(self, exc, value) File "/Users/ciasto/Development/python/clinic-backend/clinic_venv/lib/python2.7/site-packages/MySQLdb/connections.py",
line 36, in defaulterrorhandler
raise errorclass, errorvalue IntegrityError: (1452, 'Cannot add or update a child row: a foreign key constraint fails
(clinic_backend.relative, CONSTRAINT relative_ibfk_1 FOREIGN KEY
(patient_id) REFERENCES patient (id))')

Answer 1

Nothing much complicated, I figured out,
def add_patient_visit(data=None):
"""
Adds new visit to clinic of patient
for new or follow up patient.
"""
if not data:
raise ValueError("Please pass the user info.")
patient = _clinic.Patient.create(
name=data["name"],
townCity=data["townCity"],
contactnumber=data["contactnumber"],
age=data["age"],
gender=data["gender"],
email=data["email"],
postalAddress=data["postalAddress"])
relative = _clinic.Relative.create(
patient=patient,
relation=data["relation"],
relativeName=data["relativeName"])
attendence = _clinic.PatientAttendOnVisit.create(
patient=patient,
dateTimeofvisit=data["dateTimeofvisit"],
attendtype=data["attendtype"],
department=data["department"]
)