CODEWITHSUNDEEP
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Chris_1983_Norway
Chris_1983_Norway

Reputation: 399

Swift - Array.first(where

I am having an issue with userdataArray.first(where....). Basically, I am aiming to pull out userdata for a message based on the userId to populate a cell.

The variable userdata contains an array. However when I try to configure the cell with userdata?.name the simulator gives an error.

What am I doing wrong? isn't userdata an array, or is it a nested array?

Code in viewController:

let userdata = userdataArray.first(where:{$0.userId == activity.userId})
print("Array filter test")
dump(userdata)

let image = UIImage(named: "profile_image")

cell.configureCell(profileImage: image!, profileName: "(userdata?.name)!", activityDate: "8 October", name: activity.name, distance: "8 km", sightings: activity.sightings, kills: activity.kills)
return cell

Output and error from Xcode: 

Array filter test
▿ Optional(Shoota_MapKit.Userdata)
  ▿ some: Shoota_MapKit.Userdata #0
    - userId: "NhZZGwJQCGe2OGaNTwGvpPuQKNA2"
    - name: "Christian"
    - city: "Oslo"
    - country: "Norway"
    - profileImage: "profile_image"

Upvotes: 0

Views: 4073

Answers (3)

Chris_1983_Norway
Chris_1983_Norway

Reputation: 399

@shallowThought: Thanks for the help. I ended up with the below, it seems to work. 

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    guard let cell = tableView.dequeueReusableCell(withIdentifier: "feedCell") as? feedCell else {

      print("dequeueResuableCell return an else"); return UITableViewCell()
    }

    let activityDict = activityArray[indexPath.row]

    guard let userdata = userdataArray.first(where:{$0.userId == activityDict}) else {return cell}

     let image = UIImage(named: userdata.profileImage)

    cell.configureCell(profileImage: image!, profileName: userdata.name, activityDate: "8 October", name: activityDict.name, distance: "8 km", sightings: activityDict.sightings, kills: activityDict.kills)
    return cell

}

Upvotes: 0

gnasher729
gnasher729

Reputation: 52538

"(userdata?.name)!" is just a plain string, starting with an opening parenthesis. That's probably not what you wanted.

"\(userdata?.name)!" is a string using string interpolation. It will evaluate (userdata?.name)! If userdata is nil, then userdata?.name is nil, and the ! will make it crash, which is intentional.

It recommend to use if let ... or guard let ... and use some alternative code if the item is not found.

Upvotes: 1

shallowThought
shallowThought

Reputation: 19602

Make sure you have user data:

guard let userdata = userdataArray.first(where:{$0.userId == activity.userId}),
      let image = UIImage(named: "profile_image") else {
           //no userdata
           return cell
}
cell.configureCell(profileImage: image, profileName: userdata.name, activityDate: "8 October", name: activity.name, distance: "8 km", sightings: activity.sightings, kills: activity.kills)
return cell

Upvotes: 1

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