Relations are not working about meteor-ios HOT 10 CLOSED

No, you don't need to use a special package. But you will have to make sure to either use reference fields with conventional names or customize the mapping.

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You could send related objects from the server with https://github.com/englue/meteor-publish-composite

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I have an optional field createdBy in my application. When I define this das an string in my model and in the datamodel i get as value the id of of the user created this object.

 @NSManaged var createdBy: String?

 @NSManaged var createdBy: User?

If I switch it two be an User in my model and create a relationship in the datamodel i always get nil for this field.

I also have trouble just declare it as a string because i don't know how to fetch and object by the meteor _id with this framework.

@callmeahab we use this package on the server and in the web this works fine.

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You can send the user object from the server using publishComposite.
Or you can declare a separate field on the object that has createdBy, then fetch the user from the server. To do this you need to subscribe to users collection, then apply a fetch predicate to a fetch request. To get the mongo id of the object you can do let userId = Meteor.documentKeyForObjectID(user.objectID).documentID as! String.

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I use publishComposite but it does not work for me with in the iOS app.

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I still try to get the user that belongs to the event. This code crashes when i print the username.

if let userKey = event.createdBy {

                    let id = Meteor.objectIDForDocumentKey(METDocumentKey(collectionName: "user", documentID: userKey))
                    let user = Meteor.mainQueueManagedObjectContext.objectWithID(id) as! User
                    print(user.username)
                }

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Are you sure you're publishing the user? Can you check to see if user is nil?

Also, you shouldn't need to manually look up a relationship value. You should be able to just define a createdBy relationship in the managed object model and use:

@NSManaged var createdBy: User?

By default, this will look for a field named createdById, but you can customize the mapping.

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How would I customize the mapping?

Am 01.08.2015 um 03:29 schrieb Martijn Walraven [email protected]:

Are you sure you're publishing the user? Can you check to see if user is nil?

Also, you shouldn't need to manually look up a relationship value. You should be able to just define a createdBy relationship in the managed object model and use:

@NSManaged var createdBy: User?
By default, this will look for a field named createdById, but you can customize the mapping.

—
Reply to this email directly or view it on GitHub #48 (comment).

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You can specify a fieldName as userInfo in the model editor (see Todos example).

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@martijnwalraven Thanks the problem was the default mapping does not apply to our server.

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