Firestore Nested Arrays

Subscribe to this blog. You can vote up the examples you like or vote down the ones you don't like. I have a document "user" which has a key called "photos". Firestore to be able to update individual field in an array using arrayUnion So far, no easy way to just update a single field in a array inside Firestore. Make sure you keep checking Playlist for new. Similarly, you can declare a three-dimensional (3d) array. If you want to detect and respond to changes of a collection of things, use an observableArray. Learn how to query an array in the Firestore database with the new "array-contains" option in version 5. by Nikhil Sridhar Here's what I wish I knew before I started using Firebase A list of advantages and drawbacks you should consider before choosing Cloud Firestore as your database Over the last few years, Firebase has grown as an increasingly popular backend solution. In this tutorial, you learnt how to make login page using Angular and Firebase. Cloud Firestore lets you write a variety of data types inside a document, including strings, booleans, numbers, dates, null, and nested arrays and objects. Reading Time: 3 minutes Azure Databricks is an Apache Spark-based analytics platform optimized for the Microsoft Azure cloud services platform. And also, create a user class to provide some data structure. Collections contain documents, which can contain more collections. You learnt how to create a web app using Angular CLI and import the required AngularFire and Firebase module. Search issue labels to find the right project for you!. Since the Firebase team launched Cloud Firestore last week, one question/problem that keeps popping up on Stackoverflow is the result of there being two different ways to retrieve data that have to…. Now, Here is a small example Sorted with Seq. NET Driver provides asynchronous interaction with MongoDB. I searched Firebase online presentation to get informations but for some reason it is not helping me. Custom objects. Last week Google's Firebase platform released a new product, Cloud Firestore. The sorted function returns new Collection which is sorted by their natural order. It is identified by name and it contains field value pairs. The interesting thing is, if you notice all the changes happening in the firestore collection would get reflected on the screen in real time. The sorted function is used to sort the sequence in Scala like (List, Array, Vector, Seq). Then it will hit the firestore limit of 1 MiB per document. How can I write a query for all Events and append all of their Location data onto it? Thanks in advance!. Simple Code Example. As an example I use firebaseconnect to get my constants in my main file and then in my app I just use the redux state with connect to retrieve it everywhere. development. You can also use arrays or nested objects, called maps, to structure data within a document. Angular Fully Maintain your Angular app + Firestore by Angular Universal for SEO Tips to fully set your Angular Application + Firestore using Angular Universal tools for search engine bots. Although, the query does not do what the title says. Contents > What is Cloud Firestore >What are Cloud functions >Writing and Deploying Cloud Functions to write data to Cloud Firestore Collection What is Cloud Firestore It's a NoSQL document database that lets you store data for your Mobile Application, web Application, APIs… It is Cloud-based, highly scalable and flexible. Data is a corporate asset, and insights on the data is even more strategic. So we cannot retrieve the appropriate data stream but need to perform additional filtering on our side. When i display my array in console, he is not empty, but when i display myarray[0] he is undefined. A field's value can be a scalar, a list, or a nested document. A good example is an image gallery, where the user can swipe between different pictures. Enable Cloud Firestore. prototype methods) to highly common utility methods (e. 0 (the "License"); * you may not use. Nested class is such class which is created inside another class. In JSON, array values must be of type string, number, object, array, boolean or null. Periodically, Yelp awards prize money for interesting insights out of the analysis of their sample dataset. As Kato describes in the "Arrays are evil" section of his blog post, bad things can happen if you have multiple clients all trying to update or delete array elements at specific indexes. Posted on August 30, 2018 by JRodl3r. NET provides multiple options for working with Firestore data. Provide details and share your research! But avoid …. UI component infrastructure and Material Design components for mobile and desktop Angular web applications. If you want to detect and respond to changes of a collection of things, use an observableArray. The nameFunc argument is function that accepts a document and returns the value to be used for the document's primary key. In the past, Cloud Firestore addressed these issues by limiting what you can do with arrays. values to get all headers in the array. Robust data support. toString() may fail in multiple ways, for example stacking multiple parsers req. And if you’re developing or maintaining your own model, it is a lot easier to deal with the entire JSON structure in just one view, including all nested objects (arrays and sub-documents), than if you need to open a new entity for each nested object (like in the following picture representing the structure of just one of the Yelp documents). A couple of years ago, Firebase introduced the Firestore database which is the next evolution of databases on Firebase. Cloud Firestore is a NoSQL document database built for automatic scaling, high performance, and ease of application development. Enable Cloud Firestore. In part 17 of the Firestore tutorial, we will learn how to store, update and query nested objects. Firestore is a Document database. Nested select in this example is two or more dan depending on the first. Hi Friends, This post is a continuation of my previous post here. So in the firebase cloud firestore database, we have the following representation above. I migrated my whole database my making just a simple app which retrieved my DB and pushed it on Firestore You need a custom script to do that. A quick example of how to implement validation in Angular 7 using Reactive Forms. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. For example, FieldPath. This implementation tries to provide easier way. The database is needed to keep track of. Cloud Firestore lets you write a variety of data types inside a document, including strings, booleans, numbers, dates, null, and nested arrays and objects. :I would like some help if possible, I want to do a Firestore compound query inside 2 foreach statements as I need to get all relevant data back that matches the contents in the arrays being looped through. I want to display the data at the lowest level for each document in the computer collection. The Firestore CollectionReference has a very handy and cleverly named function called add. values to get all headers in the array. onRequest(req, res => {, which is specific to Cloud Functions and be left with only the code that relates to Firestore. js Data Visualization with Vue and D3 Creating a Static Site with Gridsome and a REST API Data Source all vuejs posts. A tutorial explaining how to use anonymous functions, user-defined functions, higher order functions and closures in Go. How to get data from nested JSON in Java Android. It keeps your data in sync across client apps through realtime listeners and offers offline support for mobile and web so you can build responsive apps that work regardless of network latency or Internet connectivity. Supported data type that can be stored in a document are: String, Boolean, Numbers, Date, Null and Nested Arrays & Objects. I want to display the data at the lowest level for each document in the computer collection. Custom objects. There are all sorts of issues implementing this, such as escaping dots, handling array indexes, etc, so using a library makes life much easier. You cannot run update on a document reference that does not exist (unlike RTDB) Collections are not ordered by document ID (unlike RTDB) You cannot save nested arrays (unlike RTDB) When you delete a document, its nested collections are NOT deleted (unlike RTDB) 1. You can also use arrays or nested objects, called maps, to structure data within a document. Defining arrays in Firestorm is as simple as assigning properties as array types in your Entity files. A callback function is called at the completion of a given task. It would be the unit of storage when working with Cloud Firestore. js tutorial, we show you Vue. all() method returns a single Promise that fulfills when all of the promises passed as an iterable have been fulfilled or when the iterable contains no promises or when the iterable contains promises that have been fulfilled and non-promises that have been returned. Nested data in documents You can nest complex objects like arrays or maps within documents. Type c : DocumentChange. // In the case of IN queries, the parsed data is an array (representing // the set of values to be included for the IN query) that may directly // contain additional arrays (each representing an individual field. com/lessons/query-by-array-. Blazor WebAssembly 3. So, in the above code snippet, I have created promise and observable of Promise and Observable type respectively. this might be something basic I'm missing. selectAll:. Notice that the data method can either take an array (such as matrix) or a function that returns an array. ( in index. Subscribe to this blog. Complex, nested objects in a document are called maps. The Transaction object passed to a transaction's updateFunction provides the methods to read and write data within the transaction context. Nested data in documents You can nest complex objects like arrays or maps within documents. Microservices have become a crucial part of any enterprise these days, no matter if it is a big or a small enterprise. A utility to create comparator functions for the native Array. Choosing a data structure for your Firestore project For many use cases, having nested data in documents works well than with other structures. This is in the case that your new location widget doesn't update the data directly to Firestore and just updates your customer collection. Enable Firebase Cloud Firestore. Collections contain documents, which can contain more collections. Is your data in an external source like a database? No problem - ZingGrid reads remote data, like Firebase or Cloud Firestore; It just needs a public endpoint. Full-stack Development with Angular 9, Firestore, Firebase Storage & Hosting, Firebase Cloud Functions & AngularFire 4. The Firebase team is launching a brand new a fully-managed NoSQL document database: Cloud Firestore, and we're happy to announce full support in AngularFire. These kind of structs are called as nested structs. Each documentcontains a set of key-value pairs. If we pass an object to this function, a document will be created with key-value pairs that match the properties on the object and Firestore will auto generate a unique ID for the document. Firestore documents can contains nested objects (or maps). Similarly, you can declare a three-dimensional (3d) array. MIT · Repository · Bugs · Original npm · Tarball · package. Cloud Firestore always stores numbers as doubles, regardless of what type of number you use in your code. Feature Request Can you include in the Cloud Firestore documentation an official version on how to delete a collection and all nested documents please For example, if I have the following data structure in Firestore -- how can I delete a. firestore-declarative-indexes. And also, create a user class to provide some data structure. Getting data from one realtime stream is easy enough, but what if you want to join it from another? Combining multiple async streams of data can get complex. Specifies the name of the header from which you extract the value. Now check your Firebase Realtime Database viewer at /swapi/people to make sure that you have 10 Star Wars characters stored in the collection. The comparator can use String. According to the link you provided, it says this: If your document contains nested objects, you can use "dot notation" to reference nested fields within the document when you call update():. Azure Cosmos DB is a fully managed service that enables you to offload the administrative burdens of operating and scaling distributed databases to Azure, so you don’t have to worry about managing VMs, hardware provisioning, setup and configuration, capacity, replication, software patching, or cluster scaling. log line works fine and displays all the objects, so I don't understand why I can't store it in the array. RTDB only can support up to 100K concurrents, while Firestore will be "infinite" once it is out of beta. Join the community of millions of developers who build compelling user interfaces with Angular. [cloud_firestore] Nested arrays are not supported #1637. Generate and download a Firebase Admin SDK private key by accessing the Firebase Project Console > Settings > Service Accounts Rename and put the downloaded. I could hide the RecyclerView; Or create a Firestore Query which I am sure will not return any result. I want to collect all the movie id's where in rating is above 3 from the below array. Each item inside the varargs array brings you deeper inside a nested field's path — technically an object. Store your data in documents, organized into collections. Check out this project on firebaseopensource. Make sure you keep checking Playlist for new. I would like to ask, how I can output to a. Periodically, Yelp awards prize money for interesting insights out of the analysis of their sample dataset. - unsigned integers: encoded is int64s - arrays: encoded as Firestore array values or it may be a path to a nested collection, like "States/Wisconsin/Cities". ] syntax in order to match the specific elements and apply different conditions through arrayFilters in the update statement:. Polymer dom-repeats only accept array data types. For the RTDB, using an Array as the initial value will bind the Reference as an array, otherwise it is bound as an object. You cannot run update on a document reference that does not exist (unlike RTDB) Collections are not ordered by document ID (unlike RTDB) You cannot save nested arrays (unlike RTDB) When you delete a document, its nested collections are NOT deleted (unlike RTDB) 1. java로 만 가능하다. For better assistance on this issue, if you have a support plan you may file a support ticket, else could you please send an email to [email protected] Cloud Firestore always stores numbers as doubles, regardless of what type of number you use in your code. In JavaScript, array values can be all of the above, plus any other valid JavaScript expression, including functions, dates, and undefined. I want to display the data at the lowest level for each document in the computer collection. Comparing two object arrays in angular ng-repeat. service-key. Does Firestore in "Datastore mode" have any advantages "Native mode" Google Cloud Firestore is going to replace the legacy Google Cloud Datastore soon. Those learnings won't transfer to the RTDB, because the RTDB's security rules were designed back in 2011 and are specific to its JSON data model. This both function are in same file Dropzone configuration. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. I have added from mysql database 125 items to Cloud firestore. Swagger and OpenAPI. This post is brought to you by TestFairy, a mobile testing platform that helps companies streamline their mobile development process and fix bugs faster. json — actually the data we want to push to our Firestore. js Http Client & Spring Boot Server example that uses Spring Data to do CRUD with MongoDB and Vue. Mobile apps are rarely made up of a single screen. If we pass an object to this function, a document will be created with key-value pairs that match the properties on the object and Firestore will auto generate a unique ID for the document. By using reactive forms …. This file relies on two libraries that both emit Promises, firebase and axios. The database is needed to keep track of. Hi guys, In this series of tutorial, I'll be showing you guys how to work with Firebase backend system and creating professional apps using it. The database is. arrays can contain objects can contain arrays). It’s identified with the array’s index value. So you might want to apply jsonPath to the resulting structure again or use one of your favorite array methods as sort with it. This means that if data on the server is changed, the changes are pushed to all clients that have your application open. xls a nested cell array of following form: - main cell array is of type 1x152 cell - every of 152 cell is a 1x6 cell. A big part of me feels as if it's my direction in using the array and/or i variable, but I tagged it as a firebase/firestore issue as well on the off chance it turns out to be a firebase issue. Firestore is a real-time cloud database from Google. With the Realtime Database you save your data in a nested tree, but with Cloud Firestore you save data in collections and documents with all the usual fields thrown in too which you can declare, including, Strings, Booleans, Objects, Arrays, and more! Using Collections and Documents makes for really powerful queries on your data!. Elasticsearch Reference: other versions:. Progressive web apps, or PWAs, are basically web apps that look and behave like native applications. Supersessionism, also called replacement theology or fulfillment theology, is a Christian doctrine which asserts that the New Covenant through Jesus Christ, supersedes the Old Covenant, which was made exclusively with the Jewish people. maxRefDepth: How many levels of nested references should be automatically bound. UI component infrastructure and Material Design components for mobile and desktop Angular web applications. Let's start with a simple example. 暖心芽 (WIP) 🌞 ️🌱 - reminder of hope, warmth, thoughts and feelings. I'm quite new to Cloud Firestore (aren't we all?) and I've added some data to my db using the admin SDK in Node. how to Firestore: Get all items from a 'sub' collection where id = x. Firebase supports multiple platforms/frameworks like AngularJS, EmberJS, Backbone. Firestorm is a Firestore ORM for TypeScript. And if you’re developing or maintaining your own model, it is a lot easier to deal with the entire JSON structure in just one view, including all nested objects (arrays and sub-documents), than if you need to open a new entity for each nested object (like in the following picture representing the structure of just one of the Yelp documents). The Firestore data model revolves around documents and collections. Asking for help, clarification, or responding to other answers. Mock Cloud Firestore. Firebase provides very little guidance on how to structure your unstructured JSON data. Those learnings won't transfer to the RTDB, because the RTDB's security rules were designed back in 2011 and are specific to its JSON data model. js "use strict"; /*! * Copyright 2017 Google Inc. In this video, I demonstrate how to retrieve data from Firebase (Google database as a service product). How to remove null values from nested arrays -3. Expandable RecyclerView can be used with any stock Android RecyclerView to provide expandable items. How would I create a nested struct that's able to populate each Premium_Holder document which would have all of the associated Insured_Object document. Describe and write functional interfaces 1. One great feature Firestore is partial update, Each specified element that doesn't already exist in the array will be added to the end. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Now, Here is a small example Sorted with Seq. Each documentcontains a set of key-value pairs. Next Post. They are from open source Python projects. In this kind of condition, you have to create a form which allows a user to add dynamic form fields to add additional data. Complex, nested objects in a document are called maps. Following up on #25. This is the great thing about. Join over 1,000 data professionals from around the globe to attend this unique event, learn from peers and experts, and bring dozens of actionable takeaways back to the office. React Router is a collection of navigational components that compose declaratively with your application. While not as performant as native apps or apps built with device-specific frameworks like React Native, NW. It can also be set to a function returning a value to customize the value set. Defining arrays in Firestorm is as simple as assigning properties as array types in your Entity files. First, import AngularFireModule and AngularFirestoreModule from AngularFire2 and then, initialize your application in imports array with the configuration which we had stored in environment. slice() the array first (to get a real array shallow copy) before passing to third party libraries. I'm using node. In essence, partial update for nested field work exactly like update. Enable Firebase Cloud Firestore. Firestore is a schemaless NoSQL database and stores it's data in documents which each contain a set of key-value pairs (fields). Sign in - Google Accounts - Firebase. It can also be set to a function returning a value to customize the value set. Cloud Firestore: Read, Write, Update/Realtime, and Delete Learn how to utilize the Firestore cloud database in your projects, including instructions for CRUD operations and real-time listeners. Building an Awesome Todo List App in React by kirupa | filed under Learning React If creating the Hello, World! example was a celebration of you getting your feet wet with React, creating the quintessential Todo List app is a celebration of you approaching React mastery!. But, promise returns the very first value and ignore the remaining values whereas Observable return all the value and print 1, 2, 3 in the console. You can also use arrays or nested objects, called maps, to structure data within a document. Firebase Data Organization in Firestore with What is Firebase, Features, Android Studio, Assistance, Adding Firebase to App, Installation, Data, Firebase Arrays, Event Types, Firebase Queries, Firebase Security etc. Now, let us create the service to fetch the data from Firestore database. So with the above code a token is pushed to my phone with the hardcoded ID. GitHub Gist: star and fork g33kidd's gists by creating an account on GitHub. For example: Nested Data. Cloud Firestore always stores numbers as doubles, regardless of what type of number you use in your code. Is your Cloud Firestore data structure set up correctly? Cloud Firestore supports Subcollections, Maps, and Arrays, all of which can be useful, but it's sometimes difficult to know when to use. I'm using node. Angular Material Data Table: A Complete Example (Server Pagination, Filtering, Sorting) Last Updated: 26 April 2019 local_offer Angular Material In this post, we are going to go through a complete example of how to use the Angular Material Data Table. Despite the syntax used for its definition void func(int arr[]), function func receives a pointer to the first element of the array. But with Angular we also have another option of processing the form by means of an observable chain which we then subscribe to. In part 16 of the Firestore tutorial, we will learn how to store, update and query arrays in Firestore. values to get all headers in the array. What is Firebase ? Firebase is a trending Cloud based backend as a service which provides Real Time syncing with all the clients subscribed to the server at any given instance. So you've created your cloud function and have a firestore backend. In our forthcoming posts we’ll see how to write queries to query for data in an efficient way. *We* want to avoid that at all *costs*, and to do that, Observable provides an. Both array A and B will display the new values for this item. In this video, I demonstrate how to retrieve data from Firebase (Google database as a service product). The forEach() method calls a function once for each element in an array, in order. So we cannot retrieve the appropriate data stream but need to perform additional filtering on our side. We believe that creating little good thing with specific orientation everyday can make great influence on the world someday. NET Driver provides asynchronous interaction with MongoDB. The idea is to store the leafs of the tree in an array and to map each non-leaf node to a range of leafs using start and end indexes, as is shown in the figure below: Modeling of eCommerce Catalog using Nested Sets. The forEach() method calls a function once for each element in an array, in order. (Came here via Google search and took me a while to figure out why it wasn't doing what the title said. By making it easy to store and persist data in the cloud and take care of authentication and security, …. You can also use arrays or nested objects, called maps, to structure data within a document. Firebase is a cloud datastore that's accessible directly from any connected client. I searched Firebase online presentation to get informations but for some reason it is not helping me. Firestore is a schemaless NoSQL database and stores it's data in documents which each contain a set of key-value pairs (fields). 2 and brings simplified startup, download size improvements as well as support for. That means that. El método map crea un nuevo array con los resultados de la. Electron Access to your Printer device with Electron from your Hosting Website How to access your Printer device using an Electron wrapper from your hosting Website. com is a helpful resource to understand how the operations work. NET provides multiple options for working with Firestore data. The document data itself doesn't contain subcollections, although it can contain nested data. The array can hold 12 elements. splice() from DevelopIntelligence. 1 write per second. Only the last path variable you passed to a module is kept!. since I would like to use Firestore in my next project app, I'm here to ask advices about schema. Using Nested Routes in Vue. That’s it guys. The definition is clearer as void func(int *arr). Since filter accepts an Observable, and not an array, we have to convert our array of JSON objects from data. For Firestore, collections and queries are bound as arrays while documents are bound as objects. Collections contain documents, which can contain more collections. This issue is similar to this, but there is no answer to this question: Nested Firebase Firestore forEach promise queries In my case, I'm creating an instagram-like app, where I have a 'timeline' collection. Documents can contain complex nested objects in addition to subcollections. This method may be used to iterate over the constants as follows: for (DocumentChange. Firestore documents can contains nested objects (or maps). This is the code that I tried but only values of cardno and cardtype why am I not able to access the rest of them? Any suggestions?. On these types of pages, all you really want to display is a view of static content (in this case an image), so I'm going to walk you through how to utilize the ViewPager with. Each documentcontains a set of key-value pairs. Cloning has a different meaning. Nested and repeated fields are supported in Avro, Parquet, ORC, JSON (newline delimited) formats. Other courses on flutter - here. in my function, I get the data from my firestore database. To open a document or collection at a specific path, use the Edit path button create:. The following is. You may be asking yourself what is this StreamBuilder of a thing? Lets take a brief moment to understand while we use StreamBuilder. Firestore documents can contain nested objects (or maps). Open a specific path. Nested UICollectionViews - Arrays - Strings - 2D Arrays Firebase Firestore and Storage Real-time chat with image/text messages. For example: Nested Data. In the past, it has led to hundreds of academic papers. It supports joins, nested matches, projections or live object result sets, asynchronous cursors, streaming analytics, 18 built-in predicates, in-line predicates, predicate extensibility, indexable computed values, fully indexed Dates and Arrays, built in statistical sampling. reloadData() and we'll have successfully populated our table view. Support for nested documents and arrays. JavaDocs View the Project on GitHub. pdf), Text File (. 668 defaults[72061:8599819] Cannot nest composite types (arrays and dictionaries); exiting. This video is part. in my function, I get the data from my firestore database. You can use an array value as a comparison value for in, but unlike array_contains_any, the clause matches for an exact match of array length, order, and. Register to get a free BitDegree account and start learning! Hundreds of best online courses are waiting for you here. The Java Platform Enterprise Edition 8 or Java EE 8 was released last year along with Java 9 in September 2017. React-redux-firebase can handle both, but for this tutorial, create a Firestore database. So when you copy objects from array A to B and modify a single item that is referenced in both arrays. This is useful in many scenarios where you're displaying or editing multiple values and need repeated sections of UI to appear and disappear as items are added and removed. Expandable RecyclerView can be used with any stock Android RecyclerView to provide expandable items. Users also contain references to documents, therefore, if we automatically bind every nested reference, we could end up with an infinite-memory-consumming binding. Firestore documents can contain nested objects (or maps). 0 fixed indirectly nested arrays (i. Expandable RecyclerView. These kind of structs are called as nested structs. The Firestore library for. I have a document "user" which has a key called "photos". The Firestore CollectionReference has a very handy and cleverly named function called add. Before implementing this example, create a new Angular component with the name "nested". This file relies on two libraries that both emit Promises, firebase and axios. forEach((arenasElement: any) => { sport. Firebase Update and Delete in Firestore with What is Firebase, Features, Android Studio, Assistance, Adding Firebase to App, Installation, Data, Firebase Arrays, Event Types, Firebase Queries, Firebase Security etc. Displaying Nested Firebase Data with *ngFor Help Request Example representation: Computer collection -> many documents -> a single document will have several collections -> each of these collections will have several documents ** -> these documents will have the data I want to access, but I also want to access the documents of the other. Cloud Firestore is a NoSQL document database built for automatic scaling, high performance, and ease of application development. Observable arrays are not real arrays, so they won't pass the Array. Dart arrays are Lists, so look for List in the documentation. 0 fixed indirectly nested arrays (i. The multiplayer component that supported it all was built entirely with the Firebase Realtime Database, which meant we could spend more time developing a great user experience, and less time worrying about infrastructure. by Nikhil Sridhar Here's what I wish I knew before I started using Firebase A list of advantages and drawbacks you should consider before choosing Cloud Firestore as your database Over the last few years, Firebase has grown as an increasingly popular backend solution. *We* want to avoid that at all *costs*, and to do that, Observable provides an. Thanks OK, it did update the firestore DB but had removed all other elements in the array and nested 2 new arrays called _elements and _methodName under the tags array, which is not what I expected or am requiring - Jayson Jan 2 '19 at 4:09. It turns out Nested stacks are great for reusable templates – see Use Nested Stacks to Create Reusable Templates and Support Role Specialization – not so much for decomposing an application (template). ; Android #. localeCompare(). For example, let's say I have two root Collections, "Event" and "Location". React-redux-firebase can handle both, but for this tutorial, create a Firestore database. It would be the unit of storage when working with Cloud Firestore. since I would like to use Firestore in my next project app, I'm here to ask advices about schema.