Structuring the Firestore: Should I make another collection to store the changes that were made?

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I am using Reactjs and Firestore.

I have this collection of products:

The colorMap is a map then below it are the different colors and their quanty.

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Now, I want to create a list or a history whenever a product is added and whenever the quantity in those colors was added more of it.

Should I add another collection that will store when a product is added or whenever quantities are added in the color? I'm also thinking of adding a createdDate Or there any other way I could do this? As much as possible, I won't be using any cloud functions.

google-cloud-firestore firebase reactjs nosql
1 Answers

A common way to keep the history of each document is by creating a subcollection under that document (say history) and writing a new document with either the complete, old document data there for every update you perform, or a new document with just the old values of the fields that were modified.

While it is convenient to do this from Cloud Functions, as they already get both the previous and the new data for each document write, you can accomplish the same from client-side code too.

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