ngohungphuc

public void ConfigureServices(IServiceCollection services)
        {
            services.AddDbContext<AppDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

            services
                .AddMvc()
                .AddJsonOptions(
                    options => options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
                )
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

ngohungphuc

    public class DataSchema : Schema
    {
        public DataSchema(IDependencyResolver resolver) : base(resolver)
        {
            Query = resolver.Resolve<Query>();
        }
    }

ngohungphuc

public class Query : ObjectGraphType
    {
        public Query(Repository repository)
        {
            Field<ListGraphType<PostType>>("posts",
                arguments: new QueryArguments(new List<QueryArgument>
                {
                    new QueryArgument<IdGraphType>
                    {
                        Name = "id"

ngohungphuc

 Field<ListGraphType<CommentType>, IEnumerable<Comment>>().Name("Comment")
    .ResolveAsync(ctx =>
      {
        return repository.GetCommentByPostId(ctx.Source.Id);
      });

ngohungphuc

public class PostType : ObjectGraphType<Post>
    {
        public PostType(Repository repository)
        {
            Field(x => x.Id);
            Field(x => x.Title);
            Field(x => x.Body);
            Field(x => x.UserId);
            Field<ListGraphType<CommentType>, IEnumerable<Comment>>().Name("Comment")
                .ResolveAsync(ctx =>

ngohungphuc

    <PackageReference Include="GraphQL" Version="2.4.0" />
    <PackageReference Include="GraphQL.Server.Transports.AspNetCore" Version="3.4.0" />
    <PackageReference Include="GraphQL.Server.Ui.Playground" Version="3.4.0" />

ngohungphuc

public void ConfigureServices(IServiceCollection services) 
{
  services.AddDbContext<AppDbContext>(options => 
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")
);

services
  .AddMvc()
  .AddJsonOptions(
     options => options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore

ngohungphuc

    public class Repository
    {
        private readonly AppDbContext _appDbContext;

        public Repository(AppDbContext appDbContext)
        {
            _appDbContext = appDbContext;
        }

        public IQueryable<Post> GetPostQuery()

ngohungphuc

public void ConfigureServices(IServiceCollection services) 
{
  services.AddDbContext<AppDbContext>(options => 
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")
);

services
  .AddMvc()
  .AddJsonOptions(
     options => options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore

ngohungphuc

    public class Post
    {
        public int UserId { get; set; }
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        public int Id { get; set; }
        public string Title { get; set; }
        public string Body { get; set; }
        public ICollection<Comment> Comments { get; set; }
    }