领域：一次写多个

Question

Context

I have problems using the method realm.add(object, update: true) successively.

I'm making WEB requests to my API, and I'm testing the case where internet connection is disabled. When a request failed and I get the response, I add an UnsynchronizedRequest realm object to Realm .

Problem

I have to test the case where I have to make multiples call to my API, so I will add multiple UnsynchronizedRequest objects to Realm .

I only start the next web request when I received the previous request response, so the requests are well chaining, there is no concurrent requests.

When I'm making only one request and that it failed, the object is well added to Realm .

But when I'm making more than one request , only the first is added to the Realm, and the others are not added.

What is strange is that when I'm using breakpoints , all objects are well added to Realm . But when I disable breakpoints, only the first UnsynchronizedRequest object is added to the Realm, the other are ignored.

I think it is a problem with the write thread, the doc says that it blocks other thread if multiple writes are concurrent, but I don't know how to solve it.

What I execute when a web request failed :

class func createUnsynchronizedRequest(withParameters parameters : Parameters, andRoute route : String){
    print("Adding unsynchronized request to local...")
    let failedRequest = UnsynchronizedRequest()
    failedRequest.parameters = parameters
    failedRequest.route = route
    failedRequest.date = Date()
    RealmManager.sharedInstance.addOrUpdate(object: failedRequest)
}

RealmManager.swift

func addOrUpdate(object : Object){
    try! realm.write {
        realm.add(object, update: true)
    }
}

UnsynchronizedRequest.swift

@objcMembers class UnsynchronizedRequest : Object {


// MARK: - Realm Properties

override static func primaryKey() -> String? {
    return "id"
}

dynamic var id = ""
dynamic var route = ""
dynamic var date : Date! {
    didSet {
        self.id = "\(self.date)"
    }
}
}

I already tried to check if realm was in transaction in the addOrUpdate method before starting realm.write , this not solve the problem.

I also tried to catch the error with realm.write , but no error is thrown.

Furthermore, if I execute for example 3 time a web request et that is failed, I'm sure that my code is executed because the print in createUnsynchronizedRequest is working.

I really think it is a problem with write threads because when I use breakpoint to slow the code execution, everything works well.

Example with 3 failing web requests and USING BREAKPOINTS :

As you can see, using breakpoints, the 3 objects are well added to realm :

Example with the same 3 failing web requests and WITHOUT BREAKPOINTS :

But now without breakpoints, only the first object is added to Realm :

Any idea ?

Answer 1

As I created my UnsynchronizedRequest objects with the Date() method, the created objects had the same primary keys.

The space time between object creation is not sufficient to make a Date() object different than the previous created.