I'm new to firebase and I have such structure of my firebase project
I want to get all objects, that "Interested" value is equal to "men"
I wrote such code, to get all object sorted by interes value:
let thisUserRef = URL_BASE.childByAppendingPath("profile")
thisUserRef.queryOrderedByChild("Interest")
.observeEventType(.Value, withBlock: { snapshot in
if let UserInterest = snapshot.value!["Interest"] as? String {
print (snapshot.key)
}
}
But I receive nil.
you need to loop through all the key-value profiles
if let allProfiles = snapshot.value as? [String:AnyObject] {
for (_,profile) in allProfiles {
print(profile);
let userInterest = profile["Interest"]
}
}
Here _ is the key that is in the format KYXA-random string and profile will be the element for that key.
Edit:
There is querying for child values as per the docs.
Try thisUserRef.queryOrderedByChild("Interest").equalTo("men") and then using the inner loop that i specified in the answer
This is a basic query in Firebase. (Updated for Swift 3, Firebase 4)
let profileRef = self.ref.child("profile")
profileRef.queryOrdered(byChild: "Interest").queryEqual(toValue: "men")
profileRef.observeSingleEvent(of: .value, with: { snapshot in
for child in snapshot.children {
let dict = child as! [String: Any]
let name = dict["Name"] as! String
print(name)
}
})
The legacy documentation from Firebase really outlines how to work with queries: find it here
Legacy Firebase Queries
The new documentation is pretty thin.
Oh, just to point out the variable; thisUserNode should probably be profileRef as that's what you are actually query'ing.
Related
I have 2 records in my users table
This code below
let fcmTokenRef = Database.database().reference().root.child("users").child(id!).child("fcmToken")
fcmTokenRef.observe(DataEventType.value, with: { (snapshot) in
print(">>",snapshot)
})
will print out the token of a child
How do I adjust my code to print all the tokens for all my children?
You can try
let fcmTokenRef = Database.database().reference().root.child("users").observe(DataEventType.value, with: { (snapshot) in
print(">>",snapshot)
let dic = snapshot.value as! [String:[String:Any]]
Array(dic.values).forEach {
let str = $0["fcmToken"] as! String
print(str)
}
})
You’re requesting a onetime read, hence you’re reading the data once. You need to use .childAdded
Try this:
let fcmTokenRef = Database.database().reference().child(“users”)
fcmTokenRef.observe(.childAdded, with: { (snapshot) in
print(">>",snapshot)
guard let data = snapshot as? NSDictionary else {return}
var each_token = data[“fcmToken”] as? String
print(“all tokens: \(each_token!)”)
})
#puf says something very important:
differences between child added and value firebase
The child_added event fires for each matching child under the node that you query. If there are no matching children, it will not fire.
This is my database design.
foodie-ab2b4{
Foods{
0{
FoodName: "Baked Beans In Tomato Sauce"
FoodRecipe:
FoodUri:
Image:
}
1{
FoodName: "Another bean | Bubbling Bacon Butter Beans recipes"
FoodRecipe:
FoodUri:
Image:
}
}
}
I'm working on an ios project and this is how my firebase json structured.
let ref = Database.database().reference()
func searchFoodByName(FoodName: String){
let foodsRef = ref.child("Foods")
let input = FoodName
let query = foodsRef.child(key).queryOrdered(byChild: "FoodName").queryEnding(atValue: input)
query.observeSingleEvent(of: .value, with: { snapshot in
print(snapshot)
for child in snapshot.children {
let snap = child as! DataSnapshot
let dict = snap.value as! [String: Any]
let fName = dict["FoodName"] as! String
let fIngredients = dict["Ingredients"] as! [String]
print(fName)
print(fIngredients)
let key = snapshot.key
print(key)
}
})
}
I'm trying to filter my food objects by their names. I have 10 objects in my database. In most cases this search return true objects. But there is one example i can not solve.
When i query the "tomato" word i need to get 1 object. But there is two. Although there is no tomato word in my second object.
The two object is in my json file.
If it is necessary i can upload my whole JSON file to here.
You seem to assume that Firebase can filter based on strings that contain a value, but it can't. See Firebase query - Find item with child that contains string (and the many links from there).
What Firebase can do is search for string values that start with a certain value. You do that by using a combination of queryStarting(atValue:) and queryEnding(atValue:):
let query = foodsRef
.queryOrdered(byChild: "FoodName")
.queryStarting(atValue: input)
.queryEnding(atValue: input+"\\uf8ff")
If you use this query, and input is ``Baked`, it will only match the first food from your JSON.
My data structure is something like the following:
restaurant_owners
|
|owner_id (a unique ID)
|
|restaurant_name
|email
restaurant_menus
|
|restaurant_name
|
|dish_type (drinks, appetizer, etc...)
|
|dish_id (a unique ID)
|
|name
|
|price
The idea of the app is basically to allow "restaurant_owners" to login and manage the menu of their respective restaurant. However I am having problems with the following code: (note that the fetchDish function is called in viewDidLoad)
func fetchDish() {
var restaurantName: String?
let uid = FIRAuth.auth()?.currentUser?.uid
//first time referencing database
FIRDatabase.database().reference().child("owners").child(uid!).observeSingleEvent(of: .value, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
DispatchQueue.main.async{
restaurantName = dictionary["name"] as? String
print(restaurantName!)
}
}
})
//second time referencing database
FIRDatabase.database().reference().child("restaurants").child(restaurantName!).child("appetizer").observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let dish = Dish()
dish.setValuesForKeys(dictionary)
self.dishes.append(dish)
DispatchQueue.main.async {
self.tableview.reloadData()
}
}
}, withCancel: nil)
}
What I am trying to do is to retrieve the the name of the restaurant for the current logged in user and store it in the variable "restaurantName". Then when I am referencing the database for the second time I can use this variable inside of .child (e.g.: .child(restaurantName)).
However, when I run this, I get an error saying that the restaurantName (in the database reference) is of value nil. I tried putting in some breakpoints and it seems like the first line of the second database reference is operated before whatever is "within" the first database reference, so basically restaurantName is called before any value is stored in it.
Why is this occurring? How do I work around this problem? Also, what are the best practices to achieve this if I'm doing it completely wrong?
NoSQL is very new to me and I have completely no idea how I should design my data structure. Thanks for the help in advance and please let me know if you need any other information.
UPDATE:
The problem was solved by changing my data structure to what Jay has suggested. The following code is what worked for me: (modified Jay's code a bit)
func fetchOwner() {
let uid = FIRAuth.auth()?.currentUser?.uid
let ownersRef = FIRDatabase.database().reference().child("owners")
ownersRef.child(uid!).observeSingleEvent(of: .value, with: { snapshot in
if let dict = snapshot.value as? [String: AnyObject] {
let restaurantID = dict["restaurantID"] as! String
self.fetchRestaurant(restaurantID: restaurantID)
}
}, withCancel: nil)
}
func fetchRestaurant(restaurantID: String) {
let restaurantsRef = FIRDatabase.database().reference().child("restaurants")
restaurantsRef.child(restaurantID).child("menu").observe(.childAdded, with: { snapshot in
if let dictionary = snapshot.value as? [String: AnyObject] {
let dish = Dish()
dish.setValuesForKeys(dictionary)
self.dishes.append(dish)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}, withCancel: nil)
}
A couple of things:
Firebase is Asynchronous and you have to account for that in your code. As it is in the post, the second Firebase function may execute before the first Firebase function has successfully returned data i.e. restaurantName may be nil when the second call happens.
You should nest your calls (in this use case) to ensure data is valid before working with it. Like this.. and keep reading
let ownersRef = rootRef.child("owners")
let restaurantRef = rootRef.child("restaurants")
func viewDidLoad() {
fetchOwner("owner uid")
}
func fetchOwner(ownerUid: String) {
var restaurantName: String?
let uid = FIRAuth.auth()?.currentUser?.uid
ownserRef.child(ownerUid).observeSingleEvent(of: .value, with: { snapshot in
if let dict = snapshot.value as? [String: AnyObject] {
restaurantId = dict["restaurant_id"] as? String
fetchRestaurant(restaurantId)
}
}
})
}
func fetchRestaurant(restaurantId: String) {
restaurantRef.child(restaurantId).observeSingleEvent(of: .value, with: { snapshot in
if let dict = snapshot.value as? [String: AnyObject] {
let restaurantName = dict["name"] as! String
let menuDict = dict["menu"] as! [String:Any]
self.dataSourceArray.append(menuDict)
menuTableView.reloadData()
}
}
}
Most importantly, it's almost always best practice to disassociate your key names from the data it contains. In this case, you're using the restaurant name as the key. What if the restaurant name changes or is updated? You can't change a key! The only option is to delete it and re-write it.... and... every node in the database that refers to it.
A better options it to leverage childByAutoId and let Firebase name the nodes for you and keep a child that has the relevant data.
restaurants
-Yii9sjs9s9k9ksd
name: "Bobs Big Burger Barn"
owner: -Y88jsjjdooijisad
menu:
-y8u8jh8jajsd
name: "Belly Buster Burger"
type: "burger"
price: "$1M"
-j8u89joskoko
name: "Black and Blue Burger"
type: "burger"
price: "$9.95"
As you can see, I leveraged childByAutoId to create the key for this restaurant, as well as the items on the menu. I also referenced the owner's uid in the owner node.
In this case, If the Belly Buster Burger changes to the Waist Slimming Burger, we can make one change and it's done and anything that references it is also updated. Same thing with the owner, if the owner changes, then just change the owner uid.
If the restaurant name changes to Tony's Taco Tavern, just change the child node and it's done.
Hope that helps!
edit: Answer to a comment:
To get the string (i.e. the 'key' of a key:value pair) immediately created by .childByAutoId()
let testRef = ref.child("test").childByAutoId()
let key = testRef.key
print(key)
I have been pondering for the longest time in my student programmer life. I would like to know
I added the keys using autoChildId.
How to get keys from firebase database swift 2? I know how to get from Android using .getKeys()
My best friend, Google, taught me to use allKeys. However, my friendship is on the verge of in despair right now as I received the following msg that our relationship with .allKeys will always fail ( see image below). Haish...
I need this in order to show the data from Firebase Database into my tableview cos I believe this is the issue to a empty table just like how my heart is for my project. No heart.
Here is how my firebase database looks like:
Here is my code:
func findPlaceToEat(){
print("inside findPlaceToEat()")
print("Plan price level")
print(planPriceLevel)
print("End of price level")
ref = FIRDatabase.database().reference()
ref.child("places_detail").child("price_level").child(planPriceLevel).observeEventType(.ChildAdded, withBlock:{
(snapshot) in
if let dictionary = snapshot.value?.allKeys! as? [String: AnyObject]{
let PlaceObj = placeObj(place_name: dictionary["place_name"] as! String, place_type: dictionary["place_type"] as! String, price_range: dictionary["price_range"] as! String, vegan_type:dictionary["vegan_type"] as! String , website: dictionary["website"] as! String)
print("Whatever")
print(PlaceObj);
//self.tableView.reloadData()
}
}, withCancelBlock: nil)
}
to get key from snapshot
snapshot.key
I got a workaround for my project, everyone please pray that my lecturer don't see this. :
What I did was inside the save button I retrieve the value from database and then save it back into Firebase Database.
ref = FIRDatabase.database().reference()
ref.child("hello").child("google! I need a part time job").child(planPriceLevel).observeEventType(FIRDataEventType.ChildAdded, withBlock:{
(snapshot: FIRDataSnapshot) in
if let dictionary = snapshot.value as? [String: AnyObject]{
let getPlaceObj = placeObj()
getPlaceObj.setValuesForKeysWithDictionary(dictionary)
self.PlaceObj.append(getPlaceObj)
print("Name " ,getPlaceObj.place_name)
}
let place_name = snapshot.value?.objectForKey("place_name") as! String
let place_type = snapshot.value?.objectForKey("place_type") as! String
let price_range = snapshot.value?.objectForKey("price_range") as! String
let vegan_type = snapshot.value?.objectForKey("vegan_type") as! String
let website = snapshot.value?.objectForKey("website") as! String
print(place_name, place_type, price_range, vegan_type, website)
let savePlan : [String: AnyObject] = ["place_name":place_name, "place_type":place_type, "price_range":price_range, "vegan_type":vegan_type, "website":website]
self.ref.child("can you place hire me as your intern? I am from Singapore!!!").child(self.user!.uid).childByAutoId().setValue(savePlan)
}, withCancelBlock: nil)
You need to define query orderbykey like bellow:
this.afd.list('/yourItems/', {query:{orderByKey :true}}).subscribe((elements) => {
elements.map(element=>{
console.log(element.$key);
})
});
I'm using Firebase with Alamofire, AlamofireImage to cache my imageURL data on memory and upload ImageShack.
I stuck creating descending query tried to do and search but I couldn't find possible description for me. Here's my test ref_post on Firebase.
childByAutoId()
-- userUid
-- imageUrl
-- timestamp (I have created using this)
*Using NSDate().formattedISO8601 Is it best way or Can you advice me to handle it basically?
How Can I do descending query in Firbase IOS/Swift. Here's my viewDidLoad:
let query = DataService.ds.REF_POSTS.queryOrderedByChild("timestamp")
query.observeEventType(.Value, withBlock: { snapshot in
if let snapshots = snapshot.children.allObjects as? [FDataSnapshot] {
self.posts = []
for snap in snapshots {
if let postDict = snap.value as? Dictionary<String, AnyObject> {
print(postDict)
let post = Post(imageUrl: postDict["imageUrl"]! as? String, username: DataService.ds.REF_USERS.authData.uid)
self.posts.append(post)
}
}
self.tableView.reloadData()
}
})
self.posts = self.posts.reverse()
To save NSDate instances, I personally use timeIntervalSinceReferenceDate() which returns an NSTimeInterval (which is a Double), which you can then save in Firebase. When reading the data, you can obtain the original NSDate with init(timeIntervalSinceReferenceDate:).
Instead of
self.posts.append(post)
use
self.posts.insert(post, at: 0)
This will add the items at the beginning of your list and consequently reverse the ascending order you get from firebase into a descending order.