@unique

You can mark field compounds as unique by using the @unique directive.

Example of One Unique Field Compound

type User @crudType @unique(fields: ["name", "email"], name: "name and email unique") {
    name: String!
    email: String!
}

In this example the combination of name and email has to be unique. A violation will result in the message violation of unique constraint 'name and email unique'.

Example of Multiple Unique Field Compounds

The @unique directive can also be specified more than once to define multiple unique field compounds.

type User
    @crudType
    @unique(fields: ["name", "email"], name: "name and email unique")
    @unique(fields: ["name", "address"], name: "name and address unique") {
    name: String!
    email: String!
    address: String!
}

In this example both the combination of name and email and the combination of name and address have to be unique.