firebase - Check if Field Already exists in Flutter Firestore

Question

I have a collection called company. All the companies are going to be stored like in my screenshot.

When I add another company, I want to check if the name already exists or not. How to perform that?

Here, "Nova" and "Tradetech" are two companies.

When I try to add "Nova" with the field name: "nova" again, I want to show a notice: "Company already exists!".

Answer 1

Waitting for answers