Talha Ch Talha Ch - 4 months ago 16
iOS Question

How to save data in two NSMutableArray into a single entity using magical record

I'm fetching

from web by calling an API. Then loading it into
and based on multiple selection I'm saving the selected values into two arrays i.e.
. My Entity is:

enter image description here

So I want to
[[NSManagedObjectContext MR_defaultContext] MR_saveToPersistentStoreWithCompletion:^(BOOL success, NSError *error){
but don't know how. I know this much:

- (IBAction)confirmPressed:(id)sender {
NSLog(@"Selected Are: %@ - %@",selectedDX,selectedDesc);
for (NSString *code in selectedDX) {
if (!_dxToAddEdit) {
self.dxToAddEdit = [MainCode MR_createEntity];

[self.dxToAddEdit setCode:code];
[self.dxToAddEdit setCodeDescription:@""]; //what to give here
[self.dxToAddEdit setSuperBill:_forSuperBill];
//after this I'm calling the saveToPersistent

So what to give at setCodeDescription?


If I understood correctly and based on your description and example of code you can do the following:

NSManagedObjectContext *defaultContext = [NSManagedObjectContext MR_defaultContext];
// Sorry, I renamed selectedCode to selectedCodes and selectedCodeDesc to selectedCodeDescriptions for readability.
// Not sure whether selectedDX is actually selectedCodes.
for (NSInteger i=0; i<selectedCodes.count; ++i) {
    NSString *code = selectedCodes[i];
    NSString *description = selectedCodeDescriptions[i];
    Diagnoses *newDiagnose = [Diagnoses MR_createEntityInContext:defaultContext];

    newDiagnose.code = code;
    newDiagnose.codeDescription = description;
    newDiagnose.superBill = _forSuperBill;

[defaultContext MR_saveToPersistentStoreAndWait];

Actually, I would not save the response into two separated arrays. Because of:

  • Your code becomes difficult to read
  • Imagine that the model will change and instead of two properties it will contain 4. You will have to create additional arrays.

I would recommend you to parse the response directly into the managed objects. Of course, you may not save them into persistent storage just populate your table view. I highly recommend you to read these tutorials about Core Data. It will give you insight how to work with Magical Record library. Although, the library simplifies a lot of work it would be better to know what is under the hood ;]