Realm throws error when trying to add and save object - ios

Question

I'm developing iOS app with Realm library and it works fine.
But when I tried to save one model it throws error like this.
Terminating app due to uncaught exception 'RLMException', reason:
'Target table row index out of range
Here's code.
....
do {
try realm?.write {
let newPatientImage = PatientImage()
newPatientImage.path = imageName
if let flap = flap {
newPatientImage.setStronglyTypedFlap(flap)
}
newPatientImage.hasPhoto = hasPhoto
newPatientImage.flap?.flapLocationRaw = flapLocation.rawValue
newPatientImage.id = newPatientImage.incrementalID()
patient.patientImages.append(newPatientImage)
realm?.add(newPatientImage)
realm?.add(patient, update: true)
}
} catch {
}
...
Here's newPatientImage object.
PatientImage {
id = 22;
hasPhoto = 0;
isPostOp = 0;
path = 4426699712;
date = 2019-04-26 11:32:15 +0000;
flap = RhomboidAFlap {
id = 1;
name = Rhomboid A;
adjustables = List<Adjustable> <0x280b5c120> (
[0] Adjustable {
value = 60;
defaultValue = 60;
name = A;
isDegrees = 1;
},
[1] Adjustable {
value = 60;
defaultValue = 60;
name = B;
isDegrees = 1;
},
[2] Adjustable {
value = 200;
defaultValue = 200;
name = C;
isDegrees = 0;
},
[3] Adjustable {
value = 200;
defaultValue = 200;
name = E;
isDegrees = 0;
}
);
a = 0.6491648060943035;
b = 0;
c = 0;
d = 0.6491648060943035;
tx = -195.6666717529297;
ty = -144.5;
xOffset = -44.99840983089462;
yOffset = 30.7939660691552;
width = 650;
height = 1000;
centerX = 429.5;
centerY = 499.9999999999999;
calibrationSettings = CalibrationSettings {
measurementUnitRaw = px;
conversionRatio = 1;
measuredLength = 0;
startX = 0;
startY = 0;
endX = 0;
endY = 0;
};
flapLocationRaw = ;
};
ohPlastyFlap = (null);
curvelinearFlap = (null);
rhomboidAFlap = RhomboidAFlap {
id = 1;
name = Rhomboid A;
adjustables = List<Adjustable> <0x280b5c120> (
[0] Adjustable {
value = 60;
defaultValue = 60;
name = A;
isDegrees = 1;
},
[1] Adjustable {
value = 60;
defaultValue = 60;
name = B;
isDegrees = 1;
},
[2] Adjustable {
value = 200;
defaultValue = 200;
name = C;
isDegrees = 0;
},
[3] Adjustable {
value = 200;
defaultValue = 200;
name = E;
isDegrees = 0;
}
);
a = 0.6491648060943035;
b = 0;
c = 0;
d = 0.6491648060943035;
tx = -195.6666717529297;
ty = -144.5;
xOffset = -44.99840983089462;
yOffset = 30.7939660691552;
width = 650;
height = 1000;
centerX = 429.5;
centerY = 499.9999999999999;
calibrationSettings = CalibrationSettings {
measurementUnitRaw = px;
conversionRatio = 1;
measuredLength = 0;
startX = 0;
startY = 0;
endX = 0;
endY = 0;
};
flapLocationRaw = ;
};
rhomboidBFlap = (null);
noteFlap = (null);
vyPlastyFlap = (null);
bilobedFlap = (null);
circularZFlap = (null);
atPlastyFlap = (null);
ouPlastyAFlap = (null);
ouPlastyBFlap = (null);
simpleEllipseFlap = (null);
}
And Here's patient object.
Patient {
id = 1;
firstName = Gg;
lastName = ;
email = ;
phone = ;
address1 = ;
address2 = ;
city = ;
state = ;
dateOfBirth = 2019-04-03 21:24:28 +0000;
medicalRedcordNumber = ;
imageUrl = avatar_1;
patientImages = List<PatientImage> <0x2834a5200> (
[0] PatientImage {
id = 1;
hasPhoto = 1;
isPostOp = 0;
path = 4489901936;
date = 2019-04-08 16:21:54 +0000;
flap = (null);
ohPlastyFlap = (null);
curvelinearFlap = (null);
rhomboidAFlap = (null);
rhomboidBFlap = (null);
noteFlap = (null);
vyPlastyFlap = (null);
bilobedFlap = (null);
circularZFlap = (null);
atPlastyFlap = (null);
ouPlastyAFlap = (null);
ouPlastyBFlap = (null);
simpleEllipseFlap = (null);
}
}
Could anyone please help me resolve this issue?
This issue doesn't happen before updating iOS version and Realm version.
Thanks.

Answer 1

You need to manipulate realm in a write transaction like this:
do {
try self.realm.write
{
self.realm.add(entity, update: update)
}
}
catch {}

Answer 2

It was because every Flap classes(like ohPlastyFlap, curvelinearFlap ...) override Flap class and Realm doesn't recognize Flap type.
I fixed it by correctly setting Flap type.

Answer 3

The "patient" object is missing the corresponding initialization, which is still a nil.
Before
patient.patientImages.append(newPatientImage)
try creating for "patient".