I have a very large List defined in Dart - 100,000 integers. I want to now create a Firebase document that will contain the List as a Blob. I do not want any of the list entries to be indexed by Firebase or for Firebase to do any analysis of the list. As far as I know I will need to define this as an array on my Firebase console. Will this lead to analysis of the list by Firebase? How do I create the document in Dart to ensure that the blob is not analyzed?
Thank you.
Firestore automatically creates an index for every field in your documents. You can exempt a field from being auto-indexed in your rules, either in the indexes panel in the Firebase console, or in your your rules file.
For example, here are the exemptions I have on one of my projects, where I have very large hash and count map fields in my geoindexes collection:
Related
Can not find any function in firebase storage to list all files in a specific order like ascending or descending, i have tried listoptions but it supports only two arguments maxResults and pageToken
The Cloud Storage List API does not have the ability to sort anything by some criteria you choose. If you need the ability to query objects in a bucket, you should consider also storing information about your objects in a database that can be queried with the flexibility that you require. You will need to keep that database up to date as the contents of your bucket change (perhaps using Cloud Functions triggers). This is a common thing to implement, since Cloud Storage is optimized only for storage huge amounts of data for fast retrieval at extremely low costs - it is not also trying to be a database for object metadata.
Please also see:
gsutil / gcloud storage file listing sorted date descending?
Is there any command to rename the collection or move documents from one collection to other in firestore through flutter
There is no built-in command or operation to rename a collection of move documents.
You will have to build this yourself, based upon the existing API, typically by first reading the documents from the source, then writing them to the destination, and finally deleting them fro the source. If you need the operation to be atomic, you'll want to do all of this using one or more transactions.
I want to use cloud function to produce an aggregated document containing all the data i need for the first page of my app. The aggregated document will be updated each time a document is add/updated in a Firestore collection A.
In order to do so, I have to create a separate collection B containing a single document(the aggregated doc from cloud function) which the app will fetch from when it start right? Hence, my cloud function will be updating the single document in Collection B? Am I correct in my understanding of how using cloud function to aggregate data works? Thank you very much
This is indeed a totally valid approach. Note that you may use a Transaction, in the Cloud Function, if there is a risk that source data is updated by several users in parallel.
You don't give any detail on what is in collection A (identical docs or different docs?) and what is aggregated (numbers, headlines,...), but you should try to avoid reading all the docs from collection A each time the Cloud Function is triggered. This may generate some unnecessary extra cost. If the first page of your app aggregates some figures, you may use some counters.
I have am building collection that will contain over a million documents. Each document will contain one token and a history table. A process retrieves a token, it stores the process id in the history table inside the document so it can never be used again by the same process. The tokens are reusable by different processes. I want to make each process pull a document/token and never be able to pull that same document/token again.
My approach is to have a stored history table in each document with the processes that have used the token. That is why you need to query for what is not in the array.
Firestore does not have a condition where you can search for what is not in an array. How would I perform a query like such below where array-does-not-contain being a placeholder to search through an array where 'process-001' is not in the history array?
db.collection('tokens').where('history', 'array-does-not-contain',
'process-001').limit(1).get();
Below is how I'm planning to structure my collection,
My actual problem,
I have a multiple processes running and I only want each process to pull documents from firebase that it's never seen before. The firebase collection will be over a million documents and growing.
Firestore is not very well suited for queries that need to look for things that don't exist. The problem is that the indexes it uses are only meant to tell you if things exist. The universe of strings that don't exist would be impossible to efficiently quantify for indexing.
The only want to make this happen is to know the names of all the processes ahead of time, and create values for them in the index. You would do this with a map type object, not an array:
- token: "1234"
- history: {
"process-001": false,
"process-002": false,
"process-003": false
}
This document can be queried to find out if "history.process-001" has a value of false, then updated to true when the process uses it. But again, without all the process names known ahead of time and populated in each document, the query is not possible.
See also:
Firestore get documents where value not in array?
How to query Cloud Firestore for non-existing keys of documents
I want to convert this firebase real time database structure to firestore data structure please do some help.
I want that structure like Posts(collection)/pin(collection)/pid(document)/then the post description , but i know that a collection can't contain another collection so how should i do?
All_Posts node contain pid and pin only to share that post and then get the post details using the pin and pid.
One more thing in my structure Posts-->734...(pin)-->pid-->then post details because i want to retrieve all the pids and the details under a pin .So should i do in this way or like Posts-->pids(which contain pin number)--> then fetch the details. Which one i should do?
Cloud Firestore Data model
Cloud Firestore is a NoSQL, document-oriented database. Unlike a SQL database, there are no tables or rows. Instead, you store data in documents, which are organized into collections.
Each document contains a set of key-value pairs. Cloud Firestore is optimized for storing large collections of small documents.
All documents must be stored in collections. Documents can contain subcollections and nested objects, both of which can include primitive fields like strings or complex objects like lists.
Collections and documents are created implicitly in Cloud Firestore. Simply assign data to a document within a collection. If either the collection or document does not exist, Cloud Firestore creates it.
Access the link to have more information about Cloud Firestore Data model
Your DB structure
In regards to your case scenario, you can have collections within other collections , these are called subcollections, as the example for a chat app shows here:
You can access these subcollections with the same collection ID by using Collection Group Queries.
Moving Data from Firebase Realtime Database to Cloud Firestore
For the sake of keeping this answer brief, check this link if you are planning on Moving data from Firebase Realtime Database to Cloud Firestore to consult best practices and recommendations.