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Why doesn't Core Data just save everything that works and ignore an empty object?

Given the following console output, why is my Core Data not working? The biz object seems to be empty. I have 20 " biz " objects, and only 1 is most likely empty. Why does all salvation fail?

Why doesn't Core Data just save everything that works and ignore an empty object? Instead, it returns Error in saving Error in Saving Error Domain=NSCocoaErrorDomain Code=1570 .

Here is my console log:

 2011-11-08 11:37:49.059 BadgerNew[3808:4503] <0x38a520 GrabClass.m:(509)> Biz to save <Business: 0x32e2550> (entity: Business; id: 0x32b7dd0 <x-coredata:///Business/t069264E3-D89C-4D4A-92D9-8A190B7CF255489> ; data: { Bookmark = 0; Building = nil; City = "0x32f06e0 <x-coredata:///City/t069264E3-D89C-4D4A-92D9-8A190B7CF255396>"; Distance = "484.0799568283629"; Districts = ( "0x326b7a0 <x-coredata:///District/t069264E3-D89C-4D4A-92D9-8A190B7CF255398>" ); Email = nil; ID = 22302; Images = ( "0x32df100 <x-coredata:///Image/t069264E3-D89C-4D4A-92D9-8A190B7CF255494>" ); InBuildingAddress = "Blok De Unit 1-2"; LatitudeLongitude = "0x32755f0 <x-coredata:///LatitudeLongitude/t069264E3-D89C-4D4A-92D9-8A190B7CF255495>"; Like = 0; OpeningHour = nil; Phones = ( "0x32def60 <x-coredata:///Phone/t069264E3-D89C-4D4A-92D9-8A190B7CF255493>", "0x32e2d60 <x-coredata:///Phone/t069264E3-D89C-4D4A-92D9-8A190B7CF255490>", "0x32dea90 <x-coredata:///Phone/t069264E3-D89C-4D4A-92D9-8A190B7CF255491>", "0x32decb0 <x-coredata:///Phone/t069264E3-D89C-4D4A-92D9-8A190B7CF255492>" ); Price = 0; Promotions = ( ); Rating = "0x3275000 <x-coredata:///Rating/t069264E3-D89C-4D4A-92D9-8A190B7CF255496>"; Reviews = ( ); Street = "Jl. Panjang Kedoya No. 1"; Tags = ( ); TimeStamp = nil; Title = "Bank BNI Graha Elok Mas"; URLs = ( ); Website = nil; Zip = 11520; pinAndLineNumber = 0; }) 2011-11-08 11:37:49.095 BadgerNew[3808:4503] <0x427c0 TreadClass.m:(82)> Error in Saving Error Domain=NSCocoaErrorDomain Code=1570 "The operation couldn't be completed. (Cocoa error 1570.)" UserInfo=0x31fbd0 {NSValidationErrorObject=<Business: 0x328c660> (entity: Business; id: 0x332840 <x-coredata:///Business/t069264E3-D89C-4D4A-92D9-8A190B7CF255441> ; data: { Bookmark = 0; Building = nil; City = nil; Distance = "-1"; Districts = ( ); Email = nil; ID = ""; Images = ( ); InBuildingAddress = nil; LatitudeLongitude = nil; Like = 0; OpeningHour = nil; Phones = ( ); Price = 0; Promotions = ( ); Rating = nil; Reviews = ( ); Street = nil; Tags = ( ); TimeStamp = nil; Title = nil; URLs = ( ); Website = nil; Zip = nil; pinAndLineNumber = 0; }), NSValidationErrorKey=Title, NSLocalizedDescription=The operation couldn't be completed. (Cocoa error 1570.)} 2011-11-08 11:37:51.307 BadgerNew[3808:1403] <0x427c0 TreadClass.m:(82)> Error in Saving Error Domain=NSCocoaErrorDomain Code=1570 "The operation couldn't be completed. (Cocoa error 1570.)" UserInfo=0x322ca30 {NSValidationErrorObject=<Business: 0x323f510> (entity: Business; id: 0x323f6a0 <x-coredata:///Business/t069264E3-D89C-4D4A-92D9-8A190B7CF25511> ; data: { Bookmark = 0; Building = nil; City = nil; Distance = "-1"; Districts = ( ); Email = nil; ID = ""; Images = ( ); InBuildingAddress = nil; LatitudeLongitude = nil; Like = 0; OpeningHour = nil; Phones = ( ); Price = 0; Promotions = ( ); Rating = nil; Reviews = ( ); Street = nil; Tags = ( ); TimeStamp = nil; Title = nil; URLs = ( ); Website = nil; Zip = nil; pinAndLineNumber = 0; }), NSValidationErrorKey=Title, NSLocalizedDescription=The operation couldn't be completed. (Cocoa error 1570.)} 2011-11-08 11:37:53.284 BadgerNew[3808:1b03] <0x427c0 TreadClass.m:(82)> Error in Saving Error Domain=NSCocoaErrorDomain Code=1570 "The operation couldn't be completed. (Cocoa error 1570.)" UserInfo=0x3a4c90 {NSValidationErrorObject=<Business: 0x32aee0> (entity: Business; id: 0x300480 <x-coredata:///Business/t069264E3-D89C-4D4A-92D9-8A190B7CF255220> ; data: { Bookmark = 0; Building = nil; City = nil; Distance = "-1"; Districts = ( ); Email = nil; ID = ""; Images = ( ); InBuildingAddress = nil; LatitudeLongitude = nil; Like = 0; OpeningHour = nil; Phones = ( ); Price = 0; Promotions = ( ); Rating = nil; Reviews = ( ); Street = nil; Tags = ( ); TimeStamp = nil; Title = nil; URLs = ( ); Website = nil; Zip = nil; pinAndLineNumber = 0; }), NSValidationErrorKey=Title, NSLocalizedDescription=The operation couldn't be completed. (Cocoa error 1570.)} 2011-11-08 11:37:56.480 BadgerNew[3808:4403] <0x427c0 TreadClass.m:(82)> Error in Saving Error Domain=NSCocoaErrorDomain Code=1570 "The operation couldn't be completed. (Cocoa error 1570.)" UserInfo=0x3c5e10 {NSValidationErrorObject=<Business: 0x32d4530> (entity: Business; id: 0x3d0240 <x-coredata:///Business/t069264E3-D89C-4D4A-92D9-8A190B7CF255296> ; data: { Bookmark = 0; Building = nil; City = nil; Distance = "-1"; Districts = ( ); Email = nil; ID = ""; Images = ( ); InBuildingAddress = nil; LatitudeLongitude = nil; Like = 0; OpeningHour = nil; Phones = ( ); Price = 0; Promotions = ( ); Rating = nil; Reviews = ( ); Street = nil; Tags = ( ); TimeStamp = nil; Title = nil; URLs = ( ); Website = nil; Zip = nil; pinAndLineNumber = 0; }), NSValidationErrorKey=Title, NSLocalizedDescription=The operation couldn't be completed. (Cocoa error 1570.)}
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This previous answer explains this best. To quote from the accepted answer:

This means that the required property has been assigned nil. Either in your * .xcodatamodel it checks the "optional" checkbox or when you save managedObjectContext make sure that your properties are filled.

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Source: https://habr.com/ru/post/1380121/

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