I’m trying to make a struct Identifiable that defines an API JSON data. When Swift 5.5 runs the struct with the id:String! optional, it becomes id:(String!)nil, and prints “Fatal error: Unexpectedly found nil while unwrapping an Optional value.” It seems to add nil when the optional is unwrapped. Can someone point me to a tutorial or explain why this is happening and how to fix the problem?

Define JSON Data:
struct Resource: Codable, Identifiable {
    let id:String?
    let submissionDate: String?
    var state: String?
  }

    enum CodingKeys: String, CodingKey {
        case id = "id"
        case submissionDate = "submission_date"
        case state = "state"
}

 init( submissionDate: String, state: String,  confCases: String, newCase: String, totDeath: String, confDeath: String, newDeath: String, createdAt: String ) {
      self.id = state
        self.submissionDate = submissionDate
        self.state = state
}
}

Code:
  var filteredResources: [Resource] {
        if searchText.count == 0 {
            return resources
        } else {
            return resources.filter { $0 .id! .lowercased().contains(searchText.lowercased())
            }
        }

All this suggests to me is that there must be some instance of one of these where the id (and therefore the state) members are both nil.

From a design perspective, I'd say it's a bad idea to let the id member of an Identifiable be optional, since the one guarantee that the Identifiable protocol provides is that there will be an id.

Thanks, I changed id to not be an optional and have id point to state , that works.