ios - Nested Object Update issue in Realm -


please check following model class of team , member. in team, there members can hold list of member. json object used create , update teams in service methods. member can updated individually. in member object, there property lastseenat updated according member's activity.

class team: object {   dynamic var channelid: string? = nil   dynamic var title: string? = nil   let members = list<member>()    override class func primarykey() -> string? {     return "channelid"   } }  class member: object {   dynamic var _id: string?   dynamic var lastseenat: date?   override class func primarykey() -> string? {     return "_id"   } }

service methods updating teams , members

func createandupdateteams(_ teams: [[string:any]]?) {    dispatchqueue(label: "queuenametocreate", attributes: []).async {                 let realm = try! realm()        try! realm.write({ () in         team in teams! {           realm.create(team.self, value: team, update: true)         }       })   } }  func updatemember(_ member: [string:any]?) {    dispatchqueue(label: "queuenametoupdatemember", attributes: []).async {       let realm = try! realm()        try! realm.write({         realm.create(memberrealm.self, value: member, update: true)       })   } }

to real-time update on teams, have added notification block on results<team> follows:

teams = realm.objects(team.self); notificationtoken = teams?._addnotificationblock({ [weak self](changes) in   switch( changes ) {   case .initial:     self?.tableview?.reloaddata()   case .update(_,let deletions,let insertions,let modifications):     print("modified: deletions: \(deletions.count),\n insertions: \(insertions.count),\n modifications:\(modifications.count)")     self?.tableview?.reloaddata()   case .error:     break   } })

problem

when called updatemember(_:) update member object, notification block gets called. though there no update in team, tableview load same data. effect screen fluctuates each updatemember(_:) call.

github sample project generate issue https://github.com/milankamilya/realmupdatetest

what see intended behaviour of realm. notification blocks called design if single object updated in one-to-many relationship of 1 of objects in scope of completion block. since team class has one-to-many relationship member, when setting notification block on team objects, notification block , should called each time member object gets updated if in stored in 1 of team objects members property.

see this github issue explained issue in more details.

one workaround use define members linkingobjects instead of list. haven't tried myself, according answers on linked github issue, notification block doesn't called when object changes part of linkingobjects in contrast one-to-many relationship using list.

to use linkingobjects members, need change model classes following way:

class team: object {     dynamic var channelid: string? = nil     dynamic var title: string? = nil     let members = linkingobjects(fromtype: member.self, property: "team") //finds member objects, member.team = self (this team)      override class func primarykey() -> string? {         return "channelid"     } }  class member: object {     dynamic var _id: string?     dynamic var team:team?     dynamic var lastseenat: date?     override class func primarykey() -> string? {         return "_id"     } }

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