Somebody has a solution for this:
I have a collection "stores". Every document from the collection "stores" has its fields like name, address, etc., and has a sub collection called "products". Every documento from the subcolletion "products" has its fields like name, price, etc., as shown in the print screen.
Using firestore, how can I search for a word in the "products" sub collection and retrieve the data from its parent? Search for a word in "products" and built a list with the documents of the collection "stores" that have in its subcollection "products" the searched word?
I have something like this in my project:
Future<DocumentSnapshot> get() {
return firestore.collection('products').document('Banana Frita').get();
}
Then, on my other class I would have something like this:
result = await firestoreBloc.get();
print(result.data['name']) // Banna Frita
Let me know if that works for you
PS: queria ter respondido em português :)
Related
So i have in my Cloud Firestore I have a collection of recipes that contains documents(with casual ids) with different recipes. Every document has a 2 fields with the recipe name and the recipe duration.
Every document has also a collection named likedBy where there is documents that have as ids user ids and have a single field with the date of the like.
Now i want to return all recipes that have in their likedBy subCollection the userId.
i' ll write what i' ve tried with only essential code.
String userId= 'uiuu4fn3fff4fu';
Scaffold(
body:StreamBuilder(
stream: THE STREAM THAT I NEED,
builder:(context,snapshot){
return ListView.builder(
itemCount: snapshot.data.documents.length
itemBuilder:(context,index){
return Column(children:[
Text(snapshot.data.documents[index]['recipeName']),
Text(snapshot.data.documents[index][recipeDuration]),]) } ) } ) )
What i want is to return only documents that have in their likedBy subCollection a specific user uid.
I' ve tried with this stream
Firestore.instance.collection('recipes').parent().collection('likedBy').where(FieldPath.documentId,
isEqualTo,userId).snapshots()
But it doesn' t work and i have no idea what else i can try.
Any help is highly apprecieted.
Items should not be added by the users but by admins, that means that there will be a list of items added by admins and a list of users that can add them in favorites and what i want to achieve is that users can see all their favorites in the order in which they saved them. To be clear i want something like Instagram functionality to save posts.
So you want a way to query subcollection. To do that simply use collectionGroup method:
db.collectionGroup('likedBy').where('userId', '==', '1');
To order by a value use timestamp:
// add to your document
db.collection("items")
.add({...item, created: firebase.firestore.Timestamp.fromDate(new Date()) })
and to orderby this value use orderby:
db.collection("items")
.orderBy("created", "asc")
What you might want to do instead is have a 'likedBy' property on the recipe document instead of its own sub-collection. If it is just a list of userids that should be no problem. Then you can just say recipeCollection.where(likedBy, array contains: userId)
I am trying to query data from firestore and assign it to a List.
My users collection is as follows
List<String> emailList = ['Select email', 'email1', 'email2'];
I am trying to populate the above emaillist with the emails of persons such that the list is populated by emails of the persons where the groupId is equal to groupId of current user.
I tried querying by Firebase.instance.collection.where but it gets an error saying it cant be assigned to a List.
Any idea on how to do that?
It sounds like the issue is how you are adding to the list. You have to loop through the snapshot query and for each document, add to the list.
Firestore.instance.collection('users').getDocuments().then((snapshot) => {
snapshot.documents.forEach((doc) {
emailList.add(doc.data['email']);
})
});
Hope this helps!
I want to achieve is when flutter screen loads a document should create in firestore in following order.
Document > Sub Collection > Document > Data Fields
I manage to create documents and sub collections in above order, but the first Document appear in italic. That's because the child collection, documents creating before parent document created.
But I couldn't able to fix the issue. I've modified the code now it's not even creating the document. Before this It created in italic mode. Now it's not at all.
Here is the code.
getCurrentUser().then((user) {
DocumentReference todayReference = firestoreInstance.collection('attendance').document(todayDate);
firestoreInstance.collection('profiles').where('user_id', isEqualTo: user).snapshots().listen((onData) {
onData.documents.forEach((f) {
CollectionReference todaySubCollection = todayReference.collection(f.documentID);
DocumentReference attendanceReference = todaySubCollection.document(f["name"].toString().toLowerCase());
Map<String,dynamic> mapData = new Map<String,dynamic>();
mapData['attendance_status'] = true;
mapData['in'] = true;
mapData['out'] = true;
firestoreInstance.runTransaction((transaction) async {
await transaction.set(attendanceReference, mapData);
});
});
});
});
Here getCurrentUser() is returning the logged in user id.
Each profiles assigned to a user.
So, What I'm trying to do is, once user logged in a document should create under attendance collection named today's date.
Then looping through each profiles where user_id is matched with logged in user, the matching results will be store as sub collection under today's date with profiles name field.
Then under the name (document), a transaction needs to run to set details like attendance_status, in & out.
Following images will show how previously documents created.
I need to find a way to create documents, collection without in italic mode. Any help would be appreciated.
"Italicized" documents are virtual/non-existent as mentioned in the docs. If a document only has a sub-collection, it will be a virtual/non-existent document. A workaround for this is by writing fields in the document, like what you've mentioned in the comments.
I'm trying to setup a friend system in Firestore. My data model looks like this at the moment:
collection("users") ->
document("user1")
document("user2")
...
A document in the users collection contains data like the name, email... of the user. I'd like to enable a user to have friends now, but I'm unsure about the best way to model this.
So, I'd for sure add a friends field in the documents of the users, but what should this field contain? My first thought was a pointer to a new collection called friends in which the documents are users. Something like this:
collection("users") {
document("user1") {
name:user1,
friends: -> collection("friends") {
document("user2"),
...
}
}
}
This seems reasonable, but that'd mean that I'd have a lot of duplicate data in my database because each user that has friends will be duplicated in a friends collection. Should I worry about this or is this normal in a Firestore database structure?
Would it perhaps be possible to point to a document in the users collection from the friends collection? Something like:
collection("users") {
document("user1") {
name:user1,
friends: -> collection("friends") {
document, -----
... |
} |
}, |
document("user2")<-
}
Or should I throw away the thought of using a collection for friends and just keep a list with uids of all friends of the user?
Seems you are using two separate collections for users and friends first all you can do it by one collection. But I don't want to go there may be there was another scenario.
As your separate collection way, you can design your friends collection model to meet no duplication:
{
name : 'Name',
email : 'email#mail.com'
has_connected : {
'user1' : true // here you can use anyother unique key from user
}
}
The thing is that firestore recommend this types of design for query and for faster performance you can make that has_connected key as index.
In this approach, you have to check during adding new friend by email or any other unique key. if exists then just put another key into has_connected with the respective user. e.g user2 : true.
Finally, for fetching all friends for a user you have to do a query like this: e.g: in javascript
let ref = firebase.firestore().collection("friends");
ref
.where(`has_connected.${username}`, "==", true)
.get()
.then(//do your logic)
.catch()
Thanks
I have the following User Table structure in Firebase
As you can see in the user that I have opened, I have a Posts section, inside this post section holds the Id's all articles which have been posted by this user.
The issue I am facing is as follows:
When the user creates a new article it's saved within the Posts Table, after the save I return the newly generated ID which I then pass on to the user table, I trying to insert the newly created ID into the post section of the user, so I assumed the URL would be something like this:
Users/{UserId}/Posts
However all this does it create a new section called posts, it doesn't actually insert the record into the given area.
My code which isn't working is as follows:
let linkPost = [childautoID: true]
FIRDatabase.database().reference().child("Users/\(UserId)/Posts").child(UserId).setValue(linkPost)
FYI the two id's that are currently inside Posts I added manually.
I've also tried the following:
FIRDatabase.database().reference().child("Users/\(UserId)/Posts").setValue(linkPost)
However all this does it remove all existing Id's and then inserts the new id.
I prefer something like this. This automatically append the data without fetching first
FIRDatabase.database().reference().child("Users/\(UserId)/Posts").child(UserId).setValue(true)
To append a key-value pair in Firebase Database child node use this :-
Make a Firebase Database Reference to the Posts node of that currentUser FIRDatabase.database().reference().child("Users").child(FIRAuth.auth()!.currentUser!.uid).child("Posts")
Check if Posts node exists in your user's DB, If not then create one by :- parentRef.setValue([postId : "True"]) in else block.
But if Posts node does exist retrieve it as a NSMutableDictionary , set the new object to it, and then store the updated Dictionary to that node.
func storePostsToDB(postID :String!, userID : String! = FIRAuth.auth()!.currentUser!.uid){
let parentRef = FIRDatabase.database().reference().child("Users").child(userID).child("Posts")
parentRef.observeSingleEventOfType(.Value, withBlock: {(friendsList) in
if friendsList.exists(){
if let listDict = friendsList.value as? NSMutableDictionary{
listDict.setObject("True", forKey: postID)
parentRef.setValue(listDict)
}
}else{
parentRef.setValue([postID : "True"])
}
})
}
Calling the function:-
storePostsToDB("yourPostID")// If you want to store in the currentUser DB
storePostsToDB("yourPostID", userID : otherUserID)//If you want to store the post in some other users database with uid `otherUserID`