CODEWITHSUNDEEP
iosswiftcore-dataswift2
Med Abida
Med Abida

Reputation: 1222

identify coreData Attribute's type

Im writing a library that allows developers to apply SQL code on coreData like so: 

let manager = coreSQL()
manager.prepare("INSERT INTO Entity (name, age) VALUES (?,?)")
manager.execute(["Chuck Norris" , "76"])

to insert in coreData i use this

let context:NSManagedObjectContext = appDel.managedObjectContext
let newRow = NSEntityDescription.insertNewObjectForEntityForName(tableName, inManagedObjectContext: context)
if (columnsArray.count == values.count){
    for i in 0 ..< columnsArray.count{
        newRow.setValue(values[i], forKey: columnsArray[i])
    }
    do {try context.save()} catch _ {}
}

the problem is that in my coreData object the age Attribute is of type Integer and as you may noticed Chuck Norris's age is String so when i try to execute my application i get an error :

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unacceptable type of value for attribute: property = "age"; desired type = NSNumber; given type = _TtCs19_NSContiguousString; value = 76.'

The question is: how can i identify the attribute type in order to cast the value to the same type

Upvotes: 0

Views: 289

Answers (1)

Marcus S. Zarra
Marcus S. Zarra

Reputation: 46718

You can identify the attribute type by asking the entity:

let context:NSManagedObjectContext = appDel.managedObjectContext
let newRow = NSEntityDescription.insertNewObjectForEntityForName(tableName, inManagedObjectContext: context)
let attributes = newRow.entity().attributesByName()
if (columnsArray.count == values.count){
    for i in 0 ..< columnsArray.count{
        let attributeDescription = newRow.entity.attributesByName[columnsArray[1]]
        switch attributeDescription.attributeType {
        case StringAttributeType:
        }
        newRow.setValue(values[i], forKey: columnsArray[i])
    }
    try! context.save()
}

Upvotes: 2

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