fetchLessons function before geo-pagination

LessonService.swift

    func fetchMapLessons(_ completionHandler: @escaping ([ObjectModel]?) -> Void) {

        let query = PFQuery(className: "ObjectClass")
            .addAscendingOrder("date")

        query.findObjectsInBackground { (objects, error) in
            guard let obj = objects else {
                completionHandler(nil)
                return
            }

            var viewModelArray = [ObjectModel]()
            obj.forEach { o in
                if let model = ObjectModel(fromParseObject: o) {
                    viewModelArray.append(model)
                }
            }
                                       
            completionHandler(viewModelArray)
        }
    }