Prisma

I have such type:
```
type Action {
  id: ID! @unique
  title: String!
  date: String!
  description: String
  karma: String!
  executors: String!
  members: [ActionMember!]
  author: User!
}
```

And I get this error: The relation field `members` has the wrong format: `[ActionMember]` Possible Formats: `ActionMember`, `ActionMember!`, `[ActionMember!]!`

Why can't I have `[ActionMember!]`? I want to make this field optional

it isn't a possible format :disappointed:

Possible Formats: `ActionMember`, `ActionMember!`, `[ActionMember!]!`

But [ActionMember!]! Doesn't mean it's required to have a member? Just that it will always return an array and that the children will always be of type ActionMember?

Nope, `[ActionMember!]!` means that I should pass an array of `ActionMember`s

erm, nope? `!` means that field is required, isn't it?

Yes, but `[ ]` is a valid array. It's just empty.

So an array of strings with signature [String!]! can be both `["Hello", "World"]` and `[ ]`.