I'm trying to filter the data from my database using this code:
fdb.orderByChild("title").startAt(searchquery).endAt(searchquery+"\uf8ff").addValueEventListener(valuelistener2);
My database is like this:
"g12" : {
"Books" : {
"-Mi_He4vHXOuKHNL7yeU" : {
"title" : "Technical Sciences P1"
},
"-Mi_He50tUPTN9XDiVow" : {
"title" : "Life Sciences"
},
"-Mi_He51dhQfl3RAjysQ" : {
"title" : "Technical Sciences P2"
}}
While the code works, it only returns the first value that matches the query and doesn't fetch the rest of the data even though it matches.
If I put a "T" as my search query, I just get the first title "Technical Sciences P1 " and don't get the other one with P2
(Sorry for the vague and common question title, it's just I've been looking for a solution for so long)
While the codes works, it only returns the first value that matches the query
That's the expected behavior since Firebase Realtime Database does not support native indexing or search for text fields in database properties.
When you are using the following query:
fdb.orderByChild("title").startAt(searchquery).endAt(searchquery+"\uf8ff")
It means that you are trying to get all elements that start with searchquery. For example, if you have a title called "Don Quixote" and you search for "Don", your query will return the correct results. However, searching for "Quix" will yield no results.
You might consider downloading the entire node to search for fields client-side but this solution isn't practical at all. To enable full-text search of your Firebase Realtime Database data, I recommend you to use a third-party search service like Algolia or Elasticsearch.
If you consider at some point in time to try using Cloud Firestore, please see the following example:
Is it possible to use Algolia query in FirestoreRecyclerOptions?
To see how it works with Cloud Firestore but in the same way, you can use it with Firebase Realtime Database.
Related
I'm working on an Android App written in Java.
I'm trying to query for documents in Cloud Firestore using collectionGroup and whereArrayContains.
My structure in Cloud Firestore looks like this:
Teams (collection)
- teamUUID (document)
- reservations(collection)
- reservationDate (document)
- places (collection)
- userUUIDs (array of strings)
-> one entry ->"vQn9vbWzTtcsB71hgPBhX2uWBuI3"
- placeID (document)
partial screenshot of the structure
I want to get all documents in the collection places, where the userUUIDs field contains a specific string. My code for this is the following:
db.collectionGroup("places")
.whereArrayContains("userUUIDs",
"vQn9vbWzTtcsB71hgPBhX2uWBuI3")
.get()
.addOnSuccessListener(queryDocumentSnapshots -> {
Log.d(TAG, String.valueOf(queryDocumentSnapshots.getDocuments().size()));
if (queryDocumentSnapshots.isEmpty()) {
//nothing found
Log.d(TAG, "nothing found for this user");
If this code is executed, the query is successful, but no documents are returned.
If I leave out .whereArrayContains("userUUIDs", "vQn9vbWzTtcsB71hgPBhX2uWBuI3"), one document is returned.
Google Firestore automatically created the index to query for "userUUIDs".
index created in firestore
Why are there no documents returned using whereArrayContains?
Edit:
The problem seams to exist with all queries.
I added a string testValue to places and made a whereEqualTo Query. The result was the same. After creating an index (automatically via link in the console) the onSuccessListener code was executed, but no document was found.
Thanks in advance.
Why are there no documents returned using whereArrayContains?
Because you most probably didn't create the correct index. If the userUUIDs exists within the documents from the "places" collection, when running the app you'll find a message like this in the logcat:
Caused by: io.grpc.StatusException: FAILED_PRECONDITION: The query requires a COLLECTION_GROUP_CONTAINS index for collection places and field userUUIDs. You can create it here: https://console.firebase.google.com/v1/r/project/...
You can simply click on that link or copy, and paste the URL into a web browser and your index will be created automatically.
All of the examples I'm finding online have very simple document IDs, but what do you do if you're auto-generating all your IDs (as the docs say you should)? For example, I want to query the date when the user was created. The document ID for this is below, but I've just copy-pasted it from the Firestore console. How would I know the document ID so that I may query any user's info? Note that I will be have a users, groups, usergroups, etc... There will be quite a few collections, each using the auto-ID feature. I would need to be able to update any row in any collection.
val docRef = db.collection("users").document("9AjpkmJdAdFScZaeo8FV45DT54E")
docRef.get()
.addOnSuccessListener { document ->
if (document != null) {
Log.e("Query", "Data: ${document.data}")
} else {
Log.e("Query", "Document is null")
}
}
.addOnFailureListener { exception ->
Log.e("Query", "Failure")
}
If you have data to query, that should all be stored as fields in the documents. Don't put that data in the ID of the documents - use field values.
You can filter documents in a collection using "where" clauses as shown in the documentation. What you're showing here isn't enough to go with in to make specific recommendations. But you definitely want to think about your queries ahead of time, and model your data to suit those queries.
If you need to update a document, you must first query for it, then update what you find from the query. This is extremely common, as Firestore does no provide any SQL-like "update where" queries that both locate and update data in the same command.
Is there a way to get records which matches a query partially in Solr.
For &q="java enterprise" in the below mentioned records,
{
"name":"java",
"case:"enterprise",
},
{
"name":"java enterprise"
"case": "enterprise"
}
I want to fetch only those records which have java and enterprise mentioned separately and not together, i.e only the below record should come into my result.
{
"name":"java",
"case:"enterprise",
}
Is there a way to search for only those records and eliminate the documents from the search which has exact match?
You don't need to use exact phrase match, instead, you can use boolean queries in that case
(name:"java" AND case:"enterprise" ) OR (name:"enterprise" AND case:"java" )
I am new to Firebase Database, I am making an android app in which the structure of the data is like this :
{
posts={
-Ks4AoL7F-oKtwd3M8Ao={
address=Address of mine,
title=Title ,
subcategory=E-waste, category=Garbage,
time=21-08-2017 07:54 p.m.,
mobileNumber=some mobile number,
comment=hhdhdehsbsbhs,
statusText=Pending,
imagePath=https://firebasestorage.googleapis.com/v0/b/path-to-image
},...
}
So in this structure i want to query the posts on the basis of the mobile number i.e., if the mobile number matches than the current post will be retrieved else skip this post and check for next post and so on...
you can get all the list of data from post object with the help of simple queries which you can find in documentation part of firebase, where you can check for each object's mobile no, accordingly apply the conditions to keep or discard the object.
for more info please look into the link:-
sample to retrieve the data from firebase
You can refer this post and
This
I want to implement autosuggestion functionality using elastic search. I can use nGram filters to match partial words on multiple fields and its working fine as expected. Output of the search returns full document with multiple fields as required. Now my problem is, how do I give autosuggestion to the user based on the matching field. e.g. I have got 5 fields:
{userId:'rakesh',firstName:'Rakesh','lastName':'Goyal','mobileNo':'123-123-1234','alternativeMobileNo':'123-123-1235'}
{userId:'goyal',firstName:'Goyal','lastName':'Rakshit','mobileNo':'123-123-1236','alternativeMobileNo':'123-123-1237'}
In the above example if user types 123, I want to return 123-123-1234, 123-123-1235, 123-123-1236, 123-123-1237 (4 auto suggestions).
Similarly if user types Rak, I want to return Rakesh, Rakshit (2 auto suggestions).
How do I know match exists in mobileNo and alternativeMobileNo field for first example and return results accordingly?
How do I know match exists in firstName and lastName field for second example and return results accordingly?
How do I give autosuggestion to the user based on the matching field?
When user types 123, store it in a Java variable, prepare a query like below inserting that variable into and send a request to ElasticSearch.
{
"query" : {
"query_string" : {
"query" : "*123*"
}
}
}
The above query will manage to check it in both fields mobileNo and alternativeMobileNo.
Similarly, if user types Rak, the query will be similar to the previous one,
{
"query" : {
"query_string" : {
"query" : "*Rak*"
}
}
}
And I think you want to use highlighter api to answer your last how questions, which allows to highlight search results on one or more fields.
A screenshot of highlight example in es :