I’m working on a Swift iOS app using Realm Sync and MongoDB Atlas. It’s a photo editing app, and I want people to be able to create filters that they have write access to, and be able to share them, so that other users can have read-only access to them to download them on their phone.
I’m able to sign in, open a realm, create filters, store them, and access them.
However, I’d like to run a query for all filters available to download (i.e. those which aren’t owned by me). My data is partitioned by the user_id property.
Here is the schema for my filters:
{
"title": "DFFilter",
"bsonType": "object",
"required": [
"_id",
"user_id",
"name"
],
"properties": {
"_id": {
"bsonType": "objectId"
},
"user_id": {
"bsonType": "string"
},
"name": {
"bsonType": "string"
},
"edits": {
"bsonType": "objectId"
}
}
}
And here is my equivalent swift Object:
@objc public class DFFilter : Object {
@objc dynamic public var _id: ObjectId = ObjectId.generate()
// Partition Key
@objc dynamic var user_id: String = ""
@objc dynamic public var name: String = ""
@objc dynamic public var edits: DFEdits? = nil
override public static func primaryKey() -> String? {
return "_id"
}
// ...
And here is how I’m performing the query:
let collection = database.collection(withName: "DFFilter")
let filterDocument : Document = [
"user_id": [
"$ne": AnyBSON(forUser.id)
]
]
collection.find(filter: filterDocument) { result in
switch result {
case .failure(let error):
print(error)
case .success(let documents):
print(documents)
completion(documents.map({ document in
let dfFilter = DFFilter(value: document)
print (dfFilter)
return "foo" // just a placeholder for now
}))
}
}
However, the initializer is failing to create a local unmanaged DFFilter object from the BSON Document I’m getting from Realm:
Terminating app due to uncaught exception 'RLMException', reason: 'Invalid value 'RealmSwift.AnyBSON.objectId(6089b6e38c3fafc3e01654b1)' of type '__SwiftValue' for 'object id' property 'DFFilter._id'.'
Here’s what the BSON document looks like when I print it in the console:
(lldb) po document
▿ 4 elements
▿ 0 : 2 elements
- key : "_id"
▿ value : Optional<AnyBSON>
▿ some : AnyBSON
- objectId : 6089b6e38c3fafc3e01654b1
▿ 1 : 2 elements
- key : "name"
▿ value : Optional<AnyBSON>
▿ some : AnyBSON
- string : "Hey Hey"
▿ 2 : 2 elements
- key : "user_id"
▿ value : Optional<AnyBSON>
▿ some : AnyBSON
- string : "6089b62f9c0f6a24a1a5794b"
▿ 3 : 2 elements
- key : "edits"
▿ value : Optional<AnyBSON>
▿ some : AnyBSON
- objectId : 6089b6e38c3fafc3e01654b2
I’ve tried search around for answers but I’m coming up blank. This indicates to me that potentially my whole approach to this problem might be mistaken?
It is worth pointing out that the edits property of DFFilter which you see in the schema is a different object of type DFEdits. I’m not entirely sure how MongoDB can resolve these links?