Operation Name Uniqueness

Formal Specification

• For each operation definition operation in the document
• Let operationName be the name of operation .
• If operationName exists
  • Let operations be all operation definitions in the document named operationName .
  • operations must be a set of one.

Explanatory Text

Each named operation definition must be unique within a document when referred to by its name.

For example the following document is valid:

query getDogName {
  dog {
    name
  }
}

query getOwnerName {
  dog {
    owner {
      name
    }
  }
}

While this document is invalid:

query getName {
  dog {
    name
  }
}

query getName {
  dog {
    owner {
      name
    }
  }
}

It is invalid even if the type of each operation is different:

query dogOperation {
  dog {
    name
  }
}

mutation dogOperation {
  mutateDog {
    id
  }
}