Firebase Database Structure

问题

I am working on an application about restaurant. But having some trouble with the Firebase database structure. The database structure of my code is like this:

restaurants {
             AutoID {
                      name: "nnnnn",
                      phone:"88888888" }
             AutoID {
                      name: "nnnnn",
                      phone:"88888888" }
             image {
                    AutoID: URL
                    AutoID: URL }
}

How can I change the structure to become like this:

restaurants {
             AutoID {
                      name: "nnnnn",
                      phone:"88888888",
                      image: URL }
             AutoID {
                      name: "nnnnn",
                      phone:"88888888",
                      image: URL }

The current code are:

@IBAction func saveButton(_ sender: Any)
{
    addRestaurant()
}

func addRestaurant()
{
    ref = FIRDatabase.database().reference().child("restaurants")

    let key = ref?.childByAutoId().key

    let name = addName.text

    let phone = addPhone.text

    ref?.child(key!).setValue(["name": name, "phone": phone])

}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    let image = info[UIImagePickerControllerOriginalImage] as? UIImage

    addImage.image = image

    var data = Data()
    data = UIImagePNGRepresentation(image!)!

    let uniqueName = NSUUID().uuidString
    let imageRef = FIRStorage.storage().reference().child("restaurantImage").child("\(uniqueName)")
    imageRef.put(data, metadata: nil).observe(.success){(snapshot) in
        let downloadURL = snapshot.metadata?.downloadURL()?.absoluteString
        let imageDBRef = FIRDatabase.database().reference().child("restaurants/image")
        let key = imageDBRef.childByAutoId().key
        imageDBRef.child(key).setValue(downloadURL)
    }
    self.dismiss(animated: true, completion: nil)
}

Thank you very much !

回答1:

As you told that you are first Storing image in FIRStorage then adding name and phone what you need to do is inside the closure of imageRef you need to store the reference of your stored image URL, so declare one instance property in your controller and set it inside that closure and also don't set image url in DB that time, after that with save button use that newly created property to post name, phone and url at same time.

var imageURL = ""

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    let image = info[UIImagePickerControllerOriginalImage] as? UIImage

    addImage.image = image

    var data = Data()
    data = UIImagePNGRepresentation(image!)!

    let uniqueName = NSUUID().uuidString
    let imageRef = FIRStorage.storage().reference().child("restaurantImage").child("\(uniqueName)")
    imageRef.put(data, metadata: nil).observe(.success){(snapshot) in
        self.imageURL = snapshot.metadata?.downloadURL()?.absoluteString
        //Remove other code        
    }
    self.dismiss(animated: true, completion: nil)
}

Now with your addRestaurant add key for image and set its value with imageURL

func addRestaurant()
{
    ref = FIRDatabase.database().reference().child("restaurants")        
    let key = ref?.childByAutoId().key        
    let name = addName.text        
    let phone = addPhone.text        
    ref?.child(key!).setValue(["name": name, "phone": phone, "image": imageURL])

}

来源：https://stackoverflow.com/questions/44327131/firebase-database-structure

标签

ios

swift

firebase

firebase-realtime-database