We have to have a good planning on the collection structure. However, developer cannot customise the subset of the collection group.

Collection Group Query targets to all collections with the same name.

Composited index has to be manually created and is necessary for querying data with more than one field.

Cloud Functions can be a better alternative to fetch the sensitive data since there is no cache system.

Persistent storage should be disabled when user’s sensitive data is fetched from Cloud Firestore database since cache is shared among all users log in through Firebase Authentication SDK.

Frontend SDK can cache the fetched documents and return them to user when network connection fails.Only frontend request would be checked against security rules. Cloud Firestore SDK provides tools for both frontend and backend developers to access to Cloud Firestore database directly.whereArra圜ontains This is a simplified version of whereArra圜ontainsAny and contains only ONE matching value.Number of comparison value is limited to 10. whereArra圜ontainsAny It is a logical OR comparison to see if the array field contains any one of the values.The following two can only be applied to Array but not other data type, e.g. Number of comparison value is also limited to 10. whereIn It is a logical OR comparison to see if the field contains any one of the values.There are totally 10 types of comparison available for filtering data: Range comparisons Therefore, all comparisons would ignore those documents without the filter key or with incorrect data type. Since Cloud Firestore is a NoSQL database, each document in the same collection can have different data types for the same key or even does NOT have the key at all. Violating any one of the security rules.The failure callback is triggered when there is any error during connecting with Cloud Firestore server. We can use the property isFromCache in the SnapshotMetadata of QuerySnapshot to check the data source. * The POJO must have the same key set as the one in Cloud Firestore document.Īs mentioned in previous session, Cloud Firestore SDK caches fetched data at local database and returns to app when there is any network issue. We can either manually parse every field, or simply pass a data class (See FirestoreDemoModel.kt) to toObject() function (See line 6). The data coming from Cloud Firestore is only in form of Map. Therefore, we would use limit() (Will be discussed later) to restrict the maximum number of document returned each time. However, this would cause a large network traffic if the returned document set is huge. We just have to define the collection (See line 1) and call get() function (See line 2). Note that the CDN is set up to cache static content.The simplest fetching is getting all documents from a collection.

I've set up a Cloud CDN to point to this bucket with the following details: I have a file which exists at /user-videos/test1.png. Which I expect would allow all objects in my firebase bucket to be visible. I have the following very broad firebase rule: rules_version = '2' I'm trying to add a Cloud CDN to my firebase storage bucket and I'm running into issues with the images being served by my bucket having a cache-control.

Firebase private cache