server

var ObjectID = graphql.NewScalar(graphql.ScalarConfig{
	Name:        "BSON",
	Description: "bson scalar type represents a BSON Object",

	Serialize: func(value interface{}) interface{} {
		switch value := value.(type) {
		case primitive.ObjectID:
			return value.Hex()
		case *primitive.ObjectID:
			v := value
			return v.Hex()
		default:
			return nil
		}
	},

	ParseValue: func(value interface{}) interface{} {
		switch value := value.(type) {
		case string:
			id, _ := primitive.ObjectIDFromHex(value)
			return id
		case *string:
			id, _ := primitive.ObjectIDFromHex(*value)
			return id
		default:
			return nil
		}
		return nil
	},

	ParseLiteral: func(valueAST ast.Value) interface{} {
		switch valueAST := valueAST.(type) {
		case *ast.StringValue:
			id, _ := primitive.ObjectIDFromHex(valueAST.Value)
			return id
		}
		return nil
	},
})

var TodoList []todo.Todo