Firestore Sub-Collections

What are Firestore Sub-collections???
When should you use them... and more importantly, when should you avoid them?
I bring you the answers!
SMASH THAT LIKE BUTTON!!!1!one
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GitHub:

[@StephenRayner]

2 years later it’s still a problem

[@codinginflow]

Well, documents have a 1mb and a 20k field limit and you can't download them partially. Also there is a 1 write per second limit. For a lot of use cases this is not enough, like chat messages.

[@ChrisEsplin]

Those are both great use cases for the RTDB.

[@rolikaseventysix]

I keep my code tables in subcollections. I have a collection called code-table, a doc for each code table, for example day, unit, etc. So I can easily retrieve all units by querying 'code-table/unit/*'. The number of entries/docs in subcollections are unlimited, unlike the 1 MB json for nested objects.

[@michaeloosthuizen2383]

Good use-case for sub-collections is data security. They become pretty useful when writing complex rules. Here is an example: Say we want each user to have a user profile that all other users can see, but we want certain things to be private. We can store the private data in a sub-collection and use a security rule to limit access to it. Using this technique you can get quite sophisticated access scenarios achieved, things like dynamically set privacy settings on a social media platform.

[@ChrisEsplin]

Yes! I've been using sub-collections recently for private chat rooms, and they're great for easy security. I still try to avoid them... but I've definitely found a few good use cases like this. My problem with sub-collections is that they're easy to misuse. I mean... that's not sub-collections' fault... it's user error. And I mostly hear the stories of user error, so I'm extra-sensitive to it.

[@michaeloosthuizen2383]

Indeed, when you choose to use a sub-collection you had better have a good, well thought out reason for it. Otherwise I would stick to a shallow structures with lots of denormalizing so queries are simpler and quicker.

[@ChrisEsplin]

That's exactly right. That is what I should have said in the video :)

[@Iamnoone56]

Can you tell me please how can i listen for the change in subcollections document??

[@danielborges.]

I love your vídeos. They are full of good and deep knowledge. Now I will look into your Udemy course. ;) If I may suggest, if you adjust the volume of intro's music similar to that of speech, it will sound better. I have noticed that the muisic is much louder than the speech. KZbin has recommendations for this, which are -13 LUFS. I prefer -23, which is lower. Adobe Premiere has a button that does this automatically in sound effects. Other programs should have as well.

[@ChrisEsplin]

I took a crack at adjusting my volume. Let me know if my new videos aren't fixed :)

[@oswaldopaez2947]

Nice explanation Chris!! I have a question: is there a way to get all subcollections from a document?

[@ChristopherEsplin]

There's a .getCollections() function on every document. It works great as long as you have a reference to the parent doc.

[@alexpov]

So what I your alternative for subcollection? from my perspective they are what make the firebase stand out, ease of data structures and query

[@ChrisEsplin]

Totally. Sub-collectiosn work great sometimes, but I prefer embedded objects because I can use them in my security rules and it's often easier.

[@SamuelKarani]

blinking = false; videoGreat: true;

[@skewbcuber3468]

isBlinking: false, madeGreatVideo: true,

[@MartinMartinez-hj7co]

quick feedback watch the camera or put your script on camera level. keep the great work!

[@ChrisEsplin]

I've moved to a teleprompter! It's much easier.

[@zxcvbn172]

Hello I encountered a problem using the sub-collection, due to this I am unable to progress any further, would you mind taking a look into the problem and provide me a feedback? I have posted the problem is Stack overflow and have yet to received a response. If you do I can provide the link to stackoverflow

[@eliezerponce1715]

how i can get dynamic subcollections without use the string name?

[@ahmadmohammed1607]

Seriously, why did I unsubscribed and subscribed again?

[@ReesArtist]

That was an interesting point of view, and I agree, sub collections are clumsy. But to avoid the problem of orphan sub-collections, I put a boolean description in the document : has_ingredients : True .. this way I know if the sub collection "ingredients" exists or not , and I can query it etc... What do you think of this approach ?

[@ChrisEsplin]

Yes! That's what I do too. It's clumsy... but it works!

[@ReesArtist]

Chris Esplin thanks for your reply ! Great videos btw ! I'm really interested by that Firestore topic, so I'll stay tuned :)

[@uidotdev]

💪

[@Seb16291629]

I hate firestore . It is so much easier to use express with mongoose

[@ChrisEsplin]

Then why are you watching this video???

[@gianellakatherineramirezbr817]

Hi, maybe you could help me. I must make a mobile application for a store that stores users and those must have customer registration, products and sales ... should I use subcollections or could I use only collections at the root level?

[@ChrisEsplin]

Use sub-collections with the new sub-collection group queries. They've really fixed sub-collections by adding group queries.

[@gianellakatherineramirezbr817]

@@ChrisEsplin thank you very much :)

[@williamrichardmendozamacha6761]

very very good

[@ChrisEsplin]

Thanks!

[@williamrichardmendozamacha6761]

@@ChrisEsplin Hi, could you help me? I have a dilemma about how to have data that depends on others, a blog that has many categories and that the blog has many images. Collections (blogs, categories, images) sorry for English

[@ChrisEsplin]

@@williamrichardmendozamacha6761 Sure thing! Email me at chris at christopheresplin dot com with details.

[@williamrichardmendozamacha6761]

ok

[@drodriguezApps]

use objects

[@ChristopherEsplin]

I use objects most of the time.

[@joseyanez8066]

Amigo para C# puedo hacer eso ??

[@ChrisEsplin]

Yes a new c# SDK... I think.

[@joseyanez8066]

Could you make a video explaining?

[@ChristopherEsplin]

I don't know c# :(

[@missilenerodrigues7177]

não funciona erro!! ajuda!

[@ChrisEsplin]

Como? Qual é a problema?

[@missilenerodrigues7177]

@@ChrisEsplin fiz conforme o exemplo que tem na descrição do video mais não aparece nada

[@missilenerodrigues7177]

firebase firestore versão mais recente!

[@ChrisEsplin]

Você descobriu o problema?