CODEWITHSUNDEEP
iosobjective-cjsonrealm
arsenium
arsenium

Reputation: 571

Update tables in realm

I'm just learning to programming for ios. Need advice, I read the json response, like this:

[{
    "id": 1,
    "title": "Book1",
    "author": "BookAuthor1",
    "chapters": [
        "Chapter1",
        "Chapter2",
        "Chapter3",
        "Chapter4",
        "Chapter5"
    ]
}, 
{
    "id": 2,
    "title": "Book2",
    "author": "BookAuthor2",
    "chapters": [
        "Mychapter1",
        "Mychapter2",
        "Mychapter3",
        "Mychapter4",
        "Mychapter5"
    ]
}]

I made a model for the realm:

//Book.h
@interface Book : RLMObject

@property NSInteger bookID;
@property NSString *title;
@property NSString *author;
@property RLMArray<Chapter> *chapters;

@end
RLM_ARRAY_TYPE(Book)
//Book.m
@implementation Book

+ (NSString *)primaryKey {
    return @"bookID";
}

@end

//Chapter.h
@interface Chapter : RLMObject

@property NSString *chapterTitle;

@end
RLM_ARRAY_TYPE(Chapter)

//Chapter.m
@implementation Chapter
@end

How to adjust the model to the upgrade, the data is updated in both tables? Now when I do

[Book createOrUpdateInRealm: defaultRealm withValue: newBook];

occurs only pack now offers Book table, and in Chapter new table and added to the new data (duplicate data). In the array of Chapters, only the name of Chapter, no id, to use for primaryKey. What in such cases can be done?

Upvotes: 1

Views: 98

Answers (1)

wint
wint

Reputation: 1286

Because you have no primary key for Chapter. Realm doesn't know what to update. So Realm just do its job by adding new Chapter into the table. I would suggest you to add primary key for Chapter as well.

Upvotes: 2

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