private static EventDescription CreateEvent(
IResolverContext executionContext)
{
IReadOnlyList <IFieldSelection> selections =
executionContext.CollectFields(
executionContext.RootType,
executionContext.Operation.SelectionSet);
if (selections.Count == 1)
{
IFieldSelection selection = selections[0];
var arguments = new List <ArgumentNode>();
IVariableValueCollection variables = executionContext.Variables;
foreach (ArgumentNode argument in selection.Selection.Arguments)
{
if (argument.Value is VariableNode v)
{
IValueNode value = variables.GetVariable <IValueNode>(v.Name.Value);
arguments.Add(argument.WithValue(value));
}
else
{
arguments.Add(argument);
}
}
return(new EventDescription(selection.Field.Name, arguments));
}
else
{
throw new QueryException(CoreResources.Subscriptions_SingleRootField);
}
}
public async Task <ArticleDto> GetArticleAsync(
IResolverContext ctx,
int dbId)
{
var articleType = ctx.Schema.Types.Single(t => t.Name.Value == "Article");
var fields = ctx.CollectFields(articleType as ObjectType);
return(await Task.FromResult(new ArticleDto(dbId, fields)));
}
private static void CollectSelections(
IResolverContext context,
IFieldSelection selection,
ICollection <IFieldSelection> collected)
{
if (selection.Field.Type.IsLeafType())
{
collected.Add(selection);
}
if (selection.Field.Type.NamedType() is ObjectType objectType)
{
foreach (IFieldSelection child in context.CollectFields(
objectType, selection.Selection.SelectionSet))
{
CollectSelections(context, child, collected);
}
}
}