ASP.net core and graphQL

Question

User1525382536 posted

I have build an asp.net core project which get Rest API calls and return data.

now I added a GraphQL option as well, and I have some issue not clear :

1. when I run the project and go to http://localhost:61171/ui/playground 

In my Query and Type class I put a breakpoint which I see something is calling this all the time over and and over.

2. in my Type class I tried to set a Field which returns a List of Data

a. I get an error :

System.ArgumentException: 'The GraphQL type for Field: 'Items' on parent type: 'GetReportType' could not be derived implicitly.

how should i set this field? is it possible to give the client to query only specific properties :

public List<Report> Items { get; set; }


public class Report
    {
        public string RefID{ get; set; }
        public DateTime CreateTime { get; set; }
        public string Text { get; set; }
}

==>I solved this issue #2 by define: Field<ListGraphType<ReportType>>("items");

3. how can i read a KEY which sent in the HEADER and called "MYKEY"

==> this is (#3) solved based on this https://stackoverflow.com/a/53214052/9698435

in the Query class?

thanks for the help

Answer 1

User-17257777 posted

Hi wanttolearn1,

now I added a GraphQL option as well, and I have some issue not clear :

1. when I run the project and go to http://localhost:61171/ui/playground 

In my Query and Type class I put a breakpoint which I see something is calling this all the time over and and over.

2. in my Type class I tried to set a Field which returns a List of Data

a. I get an error :

System.ArgumentException: 'The GraphQL type for Field: 'Items' on parent type: 'GetReportType' could not be derived implicitly.

how should i set this field? is it possible to give the client to query only specific properties :

public List<Report> Items { get; set; }


public class Report
    {
        public string RefID{ get; set; }
        public DateTime CreateTime { get; set; }
        public string Text { get; set; }
}

Your descripton is a little confusing. Can you share more related codes and show us the exact location of the error?

Best Regards,

Jiadong Meng

Answer 2

User1525382536 posted

Hi jiadongm ,

i hae solved issues 2+3.

my last issue is why when I set a breakpoint in the next class's I see them called over and over (while there is nothing that call for a query)

public class GetReportType : ObjectGraphType<ReportModel>
    {
        public GetReportType()
        {
            Field(t => t.Message);
            Field(t =>
                t.Count).Description("number of items that will be returned");

            Field<ListGraphType<ReportType>>("items");


            /* Field(t =>
                 t.Items).Description("items that should be returned");*/

        }
    }

and the second class 

public class ReportType : ObjectGraphType<Report>
    {
        public ReportType()
        {
            Field(t => t.SendId);
            Field(t => t.SendTime);
            Field(t => t.FromNumber);
            Field(t => t.ToNumber);
            Field(t => t.Reference);
            Field(t => t.Status);
            Field(t => t.ErrorCode);
            Field(t => t.Credits);
        }
    }

and the class public class GetReportQuery : ObjectGraphType is triggered all the time as well

not clear why.

this is my code in ConfigureServices

services.AddScoped<IDependencyResolver>(s => new FuncDependencyResolver(
                s.GetRequiredService));
            services.AddScoped<GetReportSchema>();
            services.AddGraphQL(o =>
            {
                o.ExposeExceptions = true;
            }).AddGraphTypes(ServiceLifetime.Scoped)
                .AddUserContextBuilder(httpContext => httpContext.User);
            services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

Answer 3

User1525382536 posted

I found the issue to #3

schema.polling.interval call's the schema every 2000 milliseconds

can I disable this via code?

Answer 4

User-17257777 posted

Hi wanttolearn1,

You can adjust the relevant settings in GraphQL Playground.

For more details, refer to this link: https://stackoverflow.com/a/58040379/11965297

Best Regards,

Jiadong Meng

Answer 5

User1525382536 posted

Hi i know that

but i want to do it via code