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Resolver parameters

Resolvers receive 4 parameters.

1. Argument​

The argument field is the map of arguments received in the GraphQL query.

mutation AddMovie {
    addMovie(title: "2001: A Space Odyssey", director: "Stanley Kubrick") {
        title
        director {
            name
        }
  }
}
resolvers {
    Mutation {
        resolve("addMovie") {
            val title = arguments["title"]
            val directorName = arguments["director"]
        }
    }
}

2. Source​

The source parameter contains the parent object previously resolved.

Example:

type<Director>("Director") {
    resolve("movies") {
        source.name
    }
}

3. Context​

The context parameter is the object returned by the context function.

4. Info​

The info parameter can provide you more information about the current GraphQL request.

resolvers {
    Mutation {
        resolve("addBook") {
            val requestId = info.executionId
            val selectedField = info.selectionSet.fields
        }
    }
}