Currently, I am working on a project that involves using Realm. As part of this project, I make two calls to the backend to retrieve JSON data. The first call is used to populate my database (named Categories) with category information such as an ID, Name, and imageUrl.
class Categories: Object, Mappable {
dynamic var id:Int = 0
dynamic var name:String?
dynamic var imageUrl:String?
required convenience init?(_ map: Map) {
self.init()
}
override class func primaryKey() -> String {
return "id"
}
func mapping(map: Map) {
id <- map["id"]
name <- map["name"]
imageUrl <- map["imageUrl"]
}
}
The second call returns various information and for each item, it includes a category Name and Id. This information is also stored in the "Categories" Object, however, there is no imageUrl field available in this JSON.
class Publication: Object, Mappable {
dynamic var id: Int = 0
...
var categories = List<Categories>()
required convenience init?(_ map: Map) {
self.init()
}
override static func primaryKey() -> String? {
return "id"
}
func mapping(map: Map) {
id <- map["id"]
// map ID and Categories of this item to the Categories db
categories <- (map["categories"], ListTransform<Categories>())
}
}
In some instances, the Publication JSON updates the Category database but does not include the imageUrl field as shown below:
{
"categories": [
{
"id": 39,
"name": "Etenswaren "
},
{
"id": 91,
"name": "Dranken"
}
],
}
An issue I am facing in my database is that the imageUrl field in the Categories object gets cleared after these two calls are completed. The categories found in the Publication class do not contain any URLs anymore. I want to preserve the imageUrl column even after filling it, so all URLs remain intact regardless of being mentioned in Publication. How can I achieve this?
I am open to different solutions to address this problem.