CODEWITHSUNDEEP
iosobjective-cjsoncore-datamodel
ash007
ash007

Reputation: 333

Insert JSON array into the Core Data entities

I have a JSON returned by REST API to my already existing app that I am trying to fix. I am fairly new to objective C. 

[
{
"Activities":"
         [
           {
             "activityid":845,
             "activityname":"Registration and networking breakfast",
             "actvitydesc":"Registration and networking breakfast",

           },
           {
             "activityid":846,
             "activityname":"Plenary session: The Workforce Tsunami",
             "actvitydesc":"It's Time to Rethink Talent 

           }
}
]

There is a core data entity Activity in my app, which contains the following attributes Activityid activityname activitydesc

How can I insert the JSON data inside my core data entity? Is there any need to create model class to do that? Can I insert my json data directly into core data without creating model objects?

Upvotes: 0

Views: 480

Answers (2)

Gulliva
Gulliva

Reputation: 488

If you already have the entity called Activity you can use the NSManagedObject class to set the value for an Attribute. Try this

NSManagedObject *managedObject = [NSEntityDescription insertNewObjectForEntityForName:@"Activity" inManagedObjectContext:_managedObjectContext];

[managedObject setValue:[NSNumber numberWithInteger:4711] forKey:@"activityid"];

and so on... You can also create the class by the Classgenerator of CoreData in XCode 8 there are multiple ways. Defaultly the class is generated automatically since XCode 8. If you don't like this you can disable it and generate the class manually. Just go to the CoreData Model --> Editor --> Create NSManagedObject Subclass. Note you have to deactivate the automatic code generation before. If you don't do that, you will become errors while building the project. If the name of the JSON Attribute is equal to the name of the CoreData Attribute you can also loop over the Dictionary like this:

NSArray *wrapper = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingAllowFragments error:nil];
for(NSDictionary *dict in wrapper){
    NSArray *activities = [dict objectForKey:@"Activities"];
    for(NSDictionary *activity in activities){
        NSManagedObject *managedObject = [NSEntityDescription insertNewObjectForEntityForName:@"Activity" inManagedObjectContext:_managedObjectContext];

       // [managedObject setValue:[NSNumber numberWithInteger:4711] forKey:@"activityid"];
        for(NSString *attributeName in activity)
            [managedObject setValue:[activity objectForKey:attributeName] forKey:attributeName];

    }
}

Hope that helps you...

Upvotes: 1

Axel
Axel

Reputation: 778

To insert anything to core data you need to generate models. Create core data model editor (if you don't have one) and add Entities. There is lots of tutorials on the web how to do it.

Upvotes: 0

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