How to define Nested enum type in GraphQL schema

Question

I have an enum defined in graphql schema as below:

enum QueryType {
    NORMAL, RANGE, REGEX, WILDCARD
}

But the WILDCARD query, can be further specified as STARTSWITH, ENDSWITH and CONTAINS,

So can we achieve something like below while defining Schema

 enum QueryType {
        NORMAL, RANGE, REGEX, enum WILDCARD { STARTSWITH, ENDSWITH, CONTAINS}
    }

or

 enum QueryType {
            NORMAL, RANGE, REGEX, WILDCARD: WildCardType
        }
   enum WildCardType { STARTSWITH, ENDSWITH, CONTAINS}

Ken Chan · Accepted Answer · 2021-11-26 14:53:56Z

1

There are no such nested enums in GraphQL schema. You can consider to model it using two separate fields with separate enums .

enum QueryType {
    NORMAL ,RANGE , REGEX , WILDCARD
}

enum WildcardType {
    STARTSWITH , ENDSWITH ,CONTAINS
}

And suppose an object type call SearchQuery need to contains these info . Its schema may look likes:

type SearchQuery {
    queryType : QueryType!
    wildcardType : WildcardType
}

wildcardType is an optional field which only contains the value if the queryType is WILDCARD. Otherwise , it should be null.

Alternatively you can also consider to model it to be more 'polymorphism' style using the interface. Something likes :

interface SearchQuery {
  queryType: QueryType!
}

type WildCardQuery implements  SearchQuery {
    queryType: QueryType!
    wildcardType : WildcardType!
}

type NonWildCardQuery implements SearchQuery{
    queryType: QueryType!
}

edited Nov 26, 2021 at 14:53

answered Nov 25, 2021 at 18:22

Ken Chan

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2 Comments

Nishikant Tayade Over a year ago

Thanks @KenChan, how can I convert this type to input type, as I can't use the type WildCardQuery and type NonWildCardQuery as input type for a field?

Ken Chan Over a year ago

The input type does not support interface. I am afraid that you have to use the first option for the input type at this moment though there are in-progress RFC of @oneof (github.com/graphql/graphql-spec/pull/825) to achieve the 'polymorphism' style of the input

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