Reserved Names

The following names are reserved and can’t be used to define any other identifiers:

• Int
• Float
• Boolean
• String
• DateTime
• ID
• uid
• Subscription
• as (case-insensitive)
• Query
• Mutation
• Point
• PointList
• Polygon
• MultiPolygon
• Aggregate (as a suffix of any identifier name)

For each type, Dgraph generates a number of GraphQL types needed to operate the GraphQL API, these generated type names also can’t be present in the input schema. For example, for a type Author, Dgraph generates:

• AuthorFilter
• AuthorOrderable
• AuthorOrder
• AuthorRef
• AddAuthorInput
• UpdateAuthorInput
• AuthorPatch
• AddAuthorPayload
• DeleteAuthorPayload
• UpdateAuthorPayload
• AuthorAggregateResult

Mutations

• addAuthor
• updateAuthor
• deleteAuthor

Queries

• getAuthor
• queryAuthor
• aggregateAuthor

Thus if Author is present in the input schema, all of those become reserved type names.