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Martin Hope
Agustin G.
Asked: 2022-09-01 05:28:53 +0800 CST
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I have a question with graphQL (actually I have a lot because I just started using it, but this one is punctual)

Let's imagine that I declare a type, for example Usuarios.

type Usuario {
    username: String!
    password: String!
}

And then I have the queryUsuarios

Querys {
    getUsuarios: [Usuario]!
}

If I define this query that instead of returning {Users} , I destruct it and hide the password in this way

{ ...Users, password: null }

That's when all the questions come in.

The fact that I Usuariohave defined in the type password: String!makes the backend, when it wants to return the user created with the password to null, throw me an error saying that it cannot return null from a non-nullable property.

So, what is the correct way to say that a variable must be of a strict type, but at the same time be able to ''nullify'' it in case it is sensitive data?

On the other hand I don't quite understand the difference between returning [User], [User!], [User]! or [User!]!

From already thank you very much

graphql