Firestore query two collections You will need to manually merge each document from messages with the Channel it came from by looking at the Flutter Firestore query 2 collections. Firebase firestore get data from collections documents and then subcollection documents in one array. I want to combine two firestore queries from the same collection. S. How do I join data from two Firestore collections in Flutter? 2. To optimize the performance and cost I'm currently starting to use Firestore and am running in to some questions I cannot find the answer to. I have the following collections/documents setup: * client (collection) - client1 (docum I'm really new to firebase and to be honest I find queries hard to write. Follow answered Dec 19, 2021 at 16:15. Provide details and share your research! But avoid . The collection group query will give you all documents in all subcollections with the same name. I have two Collections in Firestore and I'm using Angularfire2. Concretely, for each QueryDocumentSnapshot (which "offers the same API surface as a DocumentSnapshot") in the QuerySnapshot you can do:. HOWEVER, there is an important point to note, based on this sentence in your question: "find documents across several Collections where they have documents with no description field". Query cursors define the start and end points for a query, allowing you to: Return a subset of the data. I've read that there is no OR in firestore queries, you can't do it like this It is crucial for my application to be able to select multiple documents at random from a collection in firebase. By why to query the database twice, which is aslo costly when you can query once and get the desired documents. Firestore . but the streams maybe contains the same documents. [all_uid]. geohash' My question: what is the best approach to query my firestore collection by two geohash strings and an additional field, at once? I have two collections in firestore db 1. All where filters with an inequality (<, <=, >, or >=) must be on the same field. However, to define a specific range for a query, you should use the where() method described in Simple Queries. I've checked whether the path is correct, whether the documents exist, whether the key exists in the document and everything is ok. where If you don't want to add the parent as another field, you can get it from the parent reference. – Frank van Puffelen. Need to Query Two Collections . How do I do this? I tried StreamZip([Stream1, stream2]) method to combine the streams and it worked for me. As explained in the doc: A collection group consists of all collections with the same ID. Here's my one of my document, one document contains photos set. We will attach an onCreate listener to the fl_files collection, then write the downloadURL to the corresponding fl_content document when we see that a new file I simply want to perform an 'OR' operation and get the both results of two queries into one stream. AI and ML Application development Application hosting Compute Query a Firestore collection with a cursor start at field (multiple) filter (async) The "Firebase-y" way to do what you want, is to create a sub-collection rather than an array, and then each object in the array is instead a document in the sub collection. where Queries in Firestore are always shallow. stuffCollection); Query query = col Is it possible that the committee contacts only one reference while applicants need to provide two? What should Your query defined with . If you want to write data to a subcollection, you'll have to write it separately, being very clear to the API that you want a subcollection underneath it: This is currently not possible with collection group queries. Wouldn't sending them all as a single SELECT * FROM docs WHERE id IN (a,b,c) take the same amount of time though? I don't see the difference, since the connection is established once and the rest is pipelined over that. A common data model in NoSQL is to save a field with a document ID that points to a related document. where('City', isEqualTo: 'San Francisco') . count() sum() average() Cloud Firestore calculates the aggregation and transmits only the result back to your application. after gives you the DocumentSnapshot of the modified document. The OP asked the question again and got an answer from a Firebase team member:. – What you're asking for is called a "join", and those types of queries are not supported by Firestore. Here's my code with a single stream StreamBuilder( stream: Firestore. Asking for help, clarification, or responding to other answers. Commented Dec 18, 2019 at Since there is no logical OR operator in Firestore, I am trying to merge 2 separate queries locally. Modified 3 years, 8 months ago. Commented Feb 22, How to query Firestore collection for documents with field whose value is contained in a list. Query Explain results help you Defining the Query . Your data object is a single object, and when you store a single object as a document using the code you gave, that object will occupy that single document. startDateTime", isGreaterThanOrEqualTo: new DateTime. Collection Group Queries allow you to have a more nested data-structure without Jan 14, 2025 · Use two ranges for a Firestore query. How can I get wait until fill all list set. Angular firestore query to firestore document. where('eventID', isEqualTo: eventID) . I have a collection called 'categories' containing a single document with ID: 5gF5FqRPvdroRF8isOwd. The Firebase Realtime Database and Cloud Firestore are two separate databases. If you'd store the available slots in each room's Reservations collection, you could query across all Reservations collections to get the available slots across all rooms. Viewed 289 times Part of Google Cloud Collective 1 I want to query two sub I have the following collection in Firestore: Users (Collection) Users (Collection) -- user1 (Document) -----name: How can I query Firestore so that I get all unique names in the collection? Desired result: (John, Is it possible to query a FirebaseError: Invalid query. These queries can also be used with either get() or addSnapshotListener(), as described in Get Data. Documentation Technology areas close. document("promotions") But how do I query that DocumentReference now to show all products, in both collections to show all products of the same department? Please. jane, and roles. At the top-left, click on the settings icon (Gear wheel) near “Project Overview”. Since the subcollection has a static name, what you are looking to Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Use the startAt() or startAfter() methods to define the start point for a As you have already noted and as explained in the doc: "You can use at most one array-contains clause per query. geohash' and 'destination. For a given document, for each of the 5 search criteria, for each possible value for the criteria, add, in the document, a new field of type boolean which name is composed by the Firebase Cloud Firestore - How to query two sub-collections simultaneously? Ask Question Asked 6 years, 3 months ago. ; Select Backend Query from the Properties Panel (the right menu). We 4 days ago · Query a Firestore collection with a cursor start at field (multiple) filter (async) Use two ranges for a Firestore query; Use two ranges for a Firestore query (async) AI and ML Application development Application hosting Compute Data analytics and pipelines 4 days ago · Query a Firestore collection with a cursor start at field (multiple) filter (async) Use start cursors and limits to paginate Firestore collections (async) Use two ranges for a Firestore query; Use two ranges for a Firestore query (async) AI and ML Application development Mar 19, 2023 · This keeps you from having to learn two query syntax systems. However, in your case, you may be able to use the following approach:. Indexing considerations. log of the query result Source code-render data I am new to react native firebase firestore. documentId() == 'your-doucment-id', but that just isn't supported. where('Vehicle', isEqualTo: 'Toyota RAV4 As a short an answer, yes, looks good to me for your particular requirements. Now I wonder how I can keep up the proper order of the results. AI and ML Application development Application hosting Compute Data analytics and pipelines Query a Firestore collection with a cursor start at field (multiple) filter (async) Use two ranges for a Firestore query. Firestore doesn't support queries across different collections in one go. The simplest way to do this is probably to write a small Cloud Function that will respond to the uploaded files and place the image URL automatically in your desired collection, allowing for easier querying. To get a subcollection from a DocumentSnapshot, you must first get a DocumentReference to the document for that snapshot, and then find the CollectionReference under that. by Expertise. You also need to do the same when you save the object. Since your collections don't have the same name though, you'll have to get the list collections, and Given the query constrants of Firestore (only one range filter per query) combined with this document schema (start and end date being separated), there don't seem to be many other options. I'm working on a script in python using firebase_admin and i'd like the query/answer to be in python code, but in any other programming language is fine. where('myTags', 'array-contains', 'Macbook') will not return the two different documents. The difference here is that there isn't a single single_data subcollection. I am trying to create a query which only selects documents whose reference is equal to a given reference, using Java for Android development. AngularFire - combine two FireStore collections with the same pushId items. (The exception is collection group queries which can use documents from multiple collections that all have the same name). A document which it would match contains the reference for the path "/users/someUser". Oftentimes, you might have multiple tables in your database and you would need to view data from one table in another table - with an May 20, 2019 · At Google I/O 2019, Firebase launched a new query type, Collection Group Queries, which can have a major impact on your data modeling decisions. collection('eventClick') . Here is my code. const querySnapshot = await getDocs(userHisRef); let arr = []; I am trying query a number of documents in different collections with array-contains-any, by using Promise. I am wondering how to filter firebase firestore by date field, as I can't see data type other than String, Number, Boolean. all() to get all the documents at once. collection ('tasks'). get data from both collection and it is sub collection in firestore with flutter. I want to display all user list by firestore query. I am designing an app where the functionality is that the user should be able to search for a registered user on any of the three critieria: by Name. There are still ways but they do it differently, most cases they perform multiple read operations, store in array variable and sort it or using collection group query. Your query is using a dynamic collection group name and we can't see the value of type. by Location I can't find documentation or example how to use multiple where clauses in Flutter Stream Builder returned by Firestore Collection. Modified 6 years, 3 months ago. photos: { id1: true id2: true } Is out there any better way, how to query these two sub collections (in the future, there will be more. users 'projects' has a field 'created_by' which hold the id of the user who created it. But you need to know that there is no perfect solution for structuring a Cloud Firestore database. Flutter: Get data from two collections in Firebase. How to query data from one collection based on the data from another collection in cloud firestore? 0. So I've opted to separate the content for two root-level collections (Note you have to reference the Firestore db and import 'getDocs', 'query' and 'collection' modules from Firestore) Share. Select the widget (or page) on which to apply the query. Let’s take a look at different Firestore query limitations and discuss practical workarounds to navigate these challenges and optimize query performance. Cloud Firestore cannot query for the absence of data, so in your current model that query won't be possible. For example, an ORDER BY a ASC, b ASC query requires a composite index on the a ASC, b ASC fields. Let’s build an operator that See more Jun 20, 2019 · The most important step in using a collection group query is enabling the index that allows you to run a query in the first place. Add a simple cursor to a query. There is no way to get documents from two top-level collection in a single query. AI and ML Use start cursors and limits to paginate Firestore collections (async) Use two ranges for a Firestore query; Use two ranges for a Firestore query Firestore's speed and efficiency comes almost ENTIRELY from it's use of indexes. Cloud Firestore is optimized for storing large collections of small documents. Please edit the code to hard code the collection group name, so we can all be certain that your index matches your query. That means you'll probably want to keep the user documents in a top-level documents collection, with a owner property for their UIDs. Firestore can only use documents from a single collection at a time in a single query. Within a project, references can point to any other document in any other collection. One thing to note is that all the subcolletions must have the same name, for instance tags. I already answered a question earlier today, which is almost as yours and which I have provided a similar database schema as you already have. ref then gives you the I think your use of terminology is a bit off. A Hey to retrieve data from Firestore here is an explanation and a working snippet / App example. At some point of Query Explain allows you to submit Cloud Firestore queries to the backend and receive detailed performance statistics on backend query execution in return. Keep in mind that Firestore does not return documents without a field for which a where condition exists. Go to your project page on FlutterFlow and follow the steps below to define a Query Collection backend query:. 1 Flutter Firestore Query Nested Subcollections. For example, here’s some sample code I might write to search for all reviews where I’m the Cloud Firestore supports the following aggregation queries:. The last scenario we’ll cover is how to perform SQL like “inner join” with firebase. Then perform a single collection group query along these lines (pardon the javascript, but I am not familiar with Dart, it should be very similar): Pass just this query . The querySnapshots and snapshots have no data retrieved. I want to query documents by specific date range (01-01-2019 - 31-01-2019) and from those dates only the documents which are made in 10am to 12pm. For that, you need to make a little change in your database schema. only works as long as document with Firestore query criteria Console. Ask Question Asked 4 years, 4 months ago. In Cloud Firestore what you're trying to do is called a Collection Group Query and I'm planning the structure of my DB for a project using Cloud Firestore, and I'm currently trying to figure out the best approach to storing no way to query across multiple (sub)collections. documentId() is actually a private val promoOnedb = FirebaseFirestore. This can be counter-intuitive, take the example query condition name != "Julia". First, I’ll write the code for the collection group query I want to use and attempt to run it. There is no way to order/filter on information in another document/collection. getParent(). Inequalities (INCLUDING in and not-in) are accomplished by sorting by the index, and using the value as a "cut-off" - thus REQUIRING (whether you want it or not) the orderby() to be on the same field as the inequality. How do I get data from two collections in firestore? 0. In code: change. So I want to retrieve nodes under collection B Flutter Cloud FireStore query using multiple conditional where (StuffModel stuff) async { CollectionReference col = _firestore. Each document contains a set of key-value pairs. However, to update a chat document, I need to be able to query on both fields directly to retrieve a specific chat between two users, which would not be possible using the array approach (nested array_contains are not allowed). bob, roles. You can use the new OR capabilities of Firestore to put this in a single query. So your exists check in the security rules is typically great for getting individual documents (known as get in the more granular security rules syntax), but not for handling bulk reads (known as list in The differences between this two approaches are: If you want to query the database to get all tags of a particular question, Actually now there is, we can get all tags of all questions with the use of Firestore collection group query. It seems you are trying to join the two data from two collection in Cloud/Firebase Firestore which is faster if there's a join queries but Firestore has no join queries. I have two collections on Firestore, one that is for users and one for items items. Query a Firestore collection with multiple eq filters (async). Query Explain requests can be sent using the Firestore server client libraries. ref. Update: I didn't test this well enough to see that is doesn't produce the desired ordering. Query a Firestore collection with a cursor start at field (multiple) filter (async) Use start cursors and limits to paginate Firestore collections (async) Use two ranges for a Firestore query; Use two ranges for a Firestore query (async) AI and ML Application development But that’s a lot of steps, and I tend to be pretty lazy. The most literal translation would look like this: lessons. You can use references in queries like any other value: for filtering, ordering, and for paging (startAt/startAfter). snapshots(); I want the working to be like I needed to combine two firestore query stream in my flutter project. So don't worry about those subcollections. It will only return the documents that match the two where clauses. 28. how can get data from firestore two collections and merge all data together. The "answer not working anymore" was never really working in Queries in Firestore are shallow: they only get items from the collection that the query is run against. I just do Math. Edit #1: Found a related post (with no answers) asking about Firestore querying with roles This is because Firestore doesn't support queries across multiple collections. If you need access to the parent document, you'll can access it by calling Queries in Cloud Firestore let you find documents in large collections. The bellow query works . I have a question regarding firestore rules. Before you run your queries, read about queries and the Cloud Firestore data model. Now, generally speaking, if the two ReadTimestamp fields are in the parent doc, you will need to read this doc, as I don't think there is a workaround for Firestore queries can only order/filter on data that is part of the documents the query returns. floor(longitude) and then on querying you can do . How to get data from two collections in firebase using Flutter. now()) Since firebase automatically converts dart DateTime object to Timestamp Firebase object. Performing two firebase queries with argument from first query at once (inner join) I have a collection of users and I want to query all users from the database and display them in a RecyclerView except one, mine. Firestore get all document of a sub collection. Create another document with an array list of all the ids and changes based on addition or deletion of documents, then load that document so its one read, but can anyone tell me what the failure rate for the possibility of creating a new document and not have it added into the document array, or ways to prevent it so that it always works, P. I have a collections of "Clients" and a collection of "Jobs". A single query may only use properties of documents in a single Now I have discovered that we write the same data in two separate collections. where("longitude_tile", "==", Math. getRef(). Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Pulling items simultaneously Inner Join data from different collections at the same time. Android writes it in the user collection and ios in the basicUser collection. This example works both on Reactjs and React Native, However I cant share the RN example as that belongs to a customer. The users collection contains an array of ids for items. getInstance() private val promoOneRef: DocumentReference = promoOnedb. – My collection looks like this: Rooms{ Room1{ roomName, user1, user2, }, } I wanted to filter the results so I can get only rooms that have user1 field different than id of the current user and user2 equal to an empty string. Documents that do not have a name field at all will not be part of the results! Docs with a name of null (Firestore null type) will be part of the results though! Thanks for reading. All documents must be stored in collections. We could just perform separate document reads one-by-one, but that would be cumbersome. To query documents of collection, two asyncronous steps needed. where('region', '==', 'California'). Yes, you can query a field using type as ‘Reference’ in Firestore. To gain insight into properties of the collection as a whole, you can aggregate data over a collection. Firestore doesn't support queries across different collections in one step. You can aggregate data either at read-time or at write time: Read-time aggregations calculate a result at the time of the request. Continuing our example, if we want to find all reviews that a particular person has written, we Jan 9, 2025 · With Rowy, you can manage your Firestore collections in a spreadsheet-like UI. Each ticket has a reference field which assigns the ticket to a particular category. Since there is no native function built in to Firebase (that I know of) to achieve a query that does just this, my first thought was to use query cursors to select a random start and end index provided that I have the number of documents in the collection. I have a collection that holds documents Firestore query rules with sub collections. collection("tops") . FieldPath. ; Select the Query Type as Query Collection. The above query does NOT work because it will require Firestore to index roles. What is the Cleanest Solution to Query Data from Two Related Collections? 3. I'm trying to query a few documents from a collection, this query should listen to changes made in the queried documents, so I'd need You have snapshots() but no listen() after it. Ask Question Asked 3 years, 8 months ago. Firebase Cloud Firestore - How to query two sub-collections simultaneously? 0. Joining documents together is slightly easier than collections. I am trying using the below code; final checkSnapshot = FirebaseFirestore. As you mention, you can store both tag and pincode in product documents. I have another collection called 'tickets'. Either change the schema to support the required query, or accept that this requires some extra overhead. Query multiple Firestore Collections for same field. As I got from 'Cloud Firestore Data Model' guide "each document is identified by a name. There is one subcollection for each user_info document. You cannot build a query in Firestore that will return document without a given field. S. Node js query multiple collections in Firestore. This means that they only get items from the collection that the query is run against. @zirinisp For the longitude issue I set up an extra field in the collection whith is a virtual longitude tile. collection('Uploading Vehicle Details') . Improve this answer. You have a collection of user_info documents, and each of those documents has a sub-collection named single_data. You can then query the individual field in the sub-collection using collection-group queries. This is because queries in Firestore are shallow, they only get items from the collection that the query is run against. Is there a way to merge these two tables into one in Firestore? Merge two Firestore tables into one. ; Choose the Firestore Collection to use for performing the query. where('userID', isEqualTo: userID) . Then I thought of using two clause and merging it but that just resulted in insertion of the values. collection (collectionName ) . Michael There really are only two alternatives that I can think of: Collection group query. floor(yourCurrentLongitude)). ; change. For example, we have the class user, with id name, etc. Compared to executing a full query and calculating the aggregation in your app, aggregation queries save on both billed document reads and bytes transferred. instance . My idea was to put the 2nd query inside the Cloud Firestore is a NoSQL, document-oriented database. If that was the case, you could use a collection group query. ". As soon as we create the first document in the collection, the extension creates the firebase_orders dataset in BigQuery with two resources:. Firestore indexes are good for range queries. 1. First, authentication. I want to fetch projects along with all fields of the user who created it. david, roles. ) in one stream? (Or how to optimize my program to not use much bandwidth) Flutter Firestore query 2 collections. “orders” Collection in the Firestore database. However, if your collections are actually subcollections and have the same name, you can then use collection group queries: A collection group consists of all collections with the same ID. You might be tempted to put a filter on the query for FieldPath. It allows you to combine all subcollections that share the same Apr 12, 2023 · To overcome this limitation, you can perform multiple queries and merge the results on the client side. " Is it possible to query a collection by that document identifier (which is the name or ID)? For example, In Firestore queries are shallow. Because Cloud Firestore doesn't support ordering by a different field than the supplied inequality, you won't be able to sort by name directly from the query. Cloud Firestore provides powerful query functionality for specifying which documents you want to retrieve from a collection. 3. If I correctly understand your problem, you need to use a Collection Group query. But you have inequality filters on 'start. There is no way to get documents from multiple different collection with a single query. The reason (indexing mechanism) is well explained in this official video. snapshot. Note: While the code samples cover multiple languages, the text explaining the samples refers to the Web method names. collection(Constants. you can use a query such as this one: _firestore. . Reference is a supported data type by Cloud Firestore as in documentation. But I stuck at promise chain. Even storing both as two top-level string fields requires two firestore queries for either direction. Please only mark your question with the relevant tag, not with both. // Perform two separate queries const activeQuery = db. This is my db schema: users [collection] - uid [document] You can improve this solution since its using two queries to firestore, Firestore Query - Joining two collections. Paginate query results. alice, roles. I hope my fetchUsers() fill array without call back chain. In Cloud Firestore, the ORDER BY clause of a query determines which indexes can be used to serve the query. so when I listed them all of the documents are listed, even there is a duplicate of it. projects 2. I'm attempting to create a listview from data I have in Firestore using FutureBuilder in Flutter but from documentation and other similar questions I cannot seem to make what I'm trying to do work. – J. As below, please advice if someone find a way to filter firestore collection based on date field. Use a collection group query to retrieve documents from a collection group instead of from a How do I query my documents by specific date and time range? Ie. after. Instead, you store data in documents, which are organized into collections. As Doug Stevenson pointed out Firestore doesn't have an inner join query, therefore to follow this idea you have to write your own merging code. where("trip. Querying a sub-collection in firestore using cloud functions. With this type of index, for an inequality query, the backend would still have to scan every document in the collection in order to come up with results, and that's extremely bad for performance when the number of documents grows large. So, instead, I like enabling collection group indexes the same way I enable composite indexes. It pulls a users transactions from their credit card. Check this answer to Firestore - get the parent document of a subcollection. It functions like the EXPLAIN [ANALYZE] operation in many relational database systems. I am using flutterflow to create a receipt submission app. If you know the Firestore query API then you know how to query in To query across collections and sub-collections with the same name anywhere in Firestore, you can use collection group queries. So if you need to read from two collections, it will indeed at a minimum require two queries/read operations. Being able to listen to a Firestore collection is not related to indexes, so you don't need to worry about that. Collection Group Queries allow you to have a Aug 23, 2018 · Collection Join (Left Join SQL) One of most useful types of joins in a SQL database is a LEFT JOIN, which gives us all records from the first table, then any matching records from another table based on a shared key. collection("relatives") In here: change. Unlike a SQL database, there are no tables or rows. collection("people") Collection group queries The only way to read across collections is if those collections have the same name. Share. There is no way to get documents from a top-level collection and other collections or subcollections in a single query. By default, queries retrieve results from a single collection in your database. Break down your complex query into simpler queries, each containing a single inequality filter, and then fetch the results Mar 19, 2023 · To query across collections and sub-collections with the same name anywhere in Firestore, you can use collection group queries. 0. As indicated by Pierre Janineh you need to use the parent properties of the DocumentReference and CollectionReference classes. In other words it will return the docs that have "all the fields", as you have already experienced. When I run 2 queries independently, I can't oder the results specificly (at least not the order in which I get the results from Firestore with the orderBy method). A single query may only use properties of documents in a single collection. 0 The quickest way to get started with Google’s Firestore Database using Python. where it behaves as an empty query as soon as I use two where clauses and it starts working as soon as you . qolf rijg nzla slyh hyef eou rxzruq jjkrli hubh muiynl