Support `null` parameters.

Used NuGet Packages:

GraphQlClientGenerator version 0.9.12 GraphQl.Client version 5.1.0

Used Language: net6.0

for query-parameters I would like to suggest to implement a possibility to add parameters without values so for example :

var homeIdParameter = new GraphQlQueryParameter<Guid>("homeId", "ID", null);

var builder =
  new TibberQueryBuilder()
    .WithViewer(
      new ViewerQueryBuilder()
        .WithHome(new HomeQueryBuilder().WithAllScalarFields(), homeIdParameter)
    )
    .WithParameter(homeIdParameter);

var variables = new {
    homeId = "SOME GUID",
};

So we can use it with GraphQlHttpClient which support Variables as seen here. Because in my case I have queries that have nullable parameters but when I fill in null I get a GraphQL error that says :

{
    "errors": [
        {
            "message": "Syntax Error GraphQL (2:28) Unexpected Name \"null\"\n\n1: query (\n2:   $parameterName: UUID = null,\n",
            "locations": [
                {
                    "line": 2,
                    "column": 28
                }
            ]
        }
    ]
}

query looks like :

query ($homeId: ID = null) {
  viewer{
    home(id: $homeId) {
      id
      timeZone
      appNickname
      appAvatar
      size
      type
      numberOfResidents
      primaryHeatingSource
      hasVentilationSystem
      mainFuseSize
    }
  }
}

I would like the builded query to look like(notice there is no parameter value) :

query ($homeId: UUID) {
  viewer{
    home(id: $homeId) {
      id
      timeZone
      appNickname
      appAvatar
      size
      type
      numberOfResidents
      primaryHeatingSource
      hasVentilationSystem
      mainFuseSize
    }
  }
}

[Husqvik]

https://www.nuget.org/packages/GraphQlClientGenerator.Tool/0.9.13

[Husqvik]

Thanks. Very valid point. I’ll hope to fix it during this week.