Error with GraphQL.Types.EnumerationGraphType

Question

I'm trying to create class with enum and I have an error.

public class MarsWheather {
    public Season MarsSeason { get; set; }
}

public enum Season {
    winter,
    spring,
    summer,
    autumn
}

My graphql classes look like:

public class SolSchema : Schema
{
    public SolSchema(IServiceProvider sp) : base(sp)
    {
        Query = sp.GetRequiredService<SolDataQuery>();
        Mutation = sp.GetRequiredService<SolDataMutation>();
    }
}
public class SolDataQuery : ObjectGraphType<object>
{
    public SolDataQuery(INasaProvider nasaProvider)
    {
            Field<MarsWheatherType>("wheather", resolve: context => nasaProvider.GetAsync());
    }
}
public class MarsWheatherType : ObjectGraphType<MarsWheather>
{
    public MarsWheatherType()
    {
        Field(w => w.MarsSeason);
    }
}

public class SeasonEnum : EnumerationGraphType<Season>
{ }

I've registered it in startup.cs (ConfigureServices method) :

services.AddSingleton<SolDataQuery>();
        services.AddSingleton<SolDataMutation>();
        services.AddSingleton<SeasonEnum>();
        services.AddSingleton<MarsWheatherType>();
        services.AddSingleton<ISchema, SolSchema>();

I'm useing GraphQLPlayground. My request is :

wheather {     
 marsSeason}

After all of it I have an error:

GraphQL.Execution.UnhandledError: Error executing document.\r\n ---> >System.InvalidOperationException: Required service for type >GraphQL.Types.EnumerationGraphType`1[Mars.Season] not found\r\n at >GraphQL.Utilities.ServiceProviderExtensions.GetRequiredService(IServiceProvider provider, Type >serviceType) in /_/src/GraphQL/Utilities/ServiceProviderExtensions.cs:line 42

This error has code "INVALID_OPERATION"

Could somebody help me please? What do I do wrong? P.S. If it help, I pushed this not finished project on github

Galina Melnik · Accepted Answer · 2021-03-29 10:58:37Z

2

Ok. The correct code for MarsWheatherType is:

public class MarsWheatherType : ObjectGraphType<MarsWheather>
{
    public MarsWheatherType()
    {
        Field<SeasonEnum>("season", resolve: w => w.Source.MarsSeason);
    }
}

answered Mar 29, 2021 at 10:58

Galina Melnik

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