//public CourseType()
//{
// Field<StringGraphType>("name", resolve: x => "CourseType");
//}
public CourseType(IDataLoaderContextAccessor accessor, IInstructorStore instructors)
//public CourseType(IInstructorStore instructors)
//public CourseType(IDataLoaderContextAccessor accessor)
//public CourseType()
{
Field <IdGraphType>("courseId", resolve: x => x.Source.CourseID);
Field(x => x.DepartmentID);
Field(x => x.Credits);
Field <ListGraphType <InstructorType>, IEnumerable <Instructor> >()
.Name("instructors")
.ResolveAsync(context =>
{
// Get or add a batch loader with the key "GetUsersById"
// The loader will call GetUsersByIdAsync for each batch of keys
var loader = accessor.Context.GetOrAddCollectionBatchLoader <int, Instructor>(
"GetInstructorsByCourseId",
instructors.GetInstructorsByCourseIdAsync);
// Add this UserId to the pending keys to fetch
// The task will complete once the GetUsersByIdAsync() returns with the batched results
return(loader.LoadAsync(context.Source.CourseID));
});
}
public GraphQlQuery(IDataLoaderContextAccessor accessor, ICourseStore courses, IInstructorStore instructors)
{
FieldAsync <ListGraphType <CourseType> >("courses",
resolve: async context =>
{
var loader = accessor.Context.GetOrAddLoader("GetAllCourses", () => courses.GetAllCoursesAsync());
return(await loader.LoadAsync());
});
FieldAsync <ListGraphType <InstructorType> >("instructors",
resolve: async context =>
{
var loader = accessor.Context.GetOrAddLoader("GetAllInstructors", () => instructors.GetAllInstructorsAsync());
return(await loader.LoadAsync());
});
}
