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How to add new child document to parent document with Flutter SDK?
I have a parent document, I want to add new child document to the parent document, but by using updateDocument, the new child will replace the old child in the parent document. In console, there is an Add Item button to add new child, which seem to work like what I wanted, so I assume this is possible. But I don't know how to, in the docs, there is no reference about it: https://appwrite.io/docs/products/databases/relationships#update
TL;DR
Developers want to add a new child document to a parent document using Flutter SDK. Using `updateDocument` replaces the old child with the new one, but they want to add the new child without replacing the old one. They noticed an 'Add Item' button in the console that accomplishes this. The solution is to use arrayUnion to add a new child document to the parent document without replacing the old child.