private static void ResolveFieldSelection(
ObjectType type,
FieldNode fieldSelection,
Action <QueryError> reportError,
Dictionary <string, FieldSelection> fields)
{
NameString fieldName = fieldSelection.Name.Value;
if (type.Fields.TryGetField(fieldName, out ObjectField field))
{
string name = fieldSelection.Alias == null
? fieldSelection.Name.Value
: fieldSelection.Alias.Value;
if (fields.TryGetValue(name, out FieldSelection selection))
{
fields[name] = selection.Merge(fieldSelection);
}
else
{
fields.Add(name, FieldSelection.Create(
fieldSelection, field, name));
}
}
else
{
reportError(QueryError.CreateFieldError(
"Could not resolve the specified field.",
fieldSelection));
}
}
private void ReportNonNullError()
{
ReportError(QueryError.CreateFieldError(
"Cannot return null for non-nullable field.",
Path,
Selection.Selection));
}
public void CompleteValue(
IFieldValueCompletionContext completionContext,
Action <IFieldValueCompletionContext> nextHandler)
{
if (completionContext.Type.IsObjectType() ||
completionContext.Type.IsInterfaceType() ||
completionContext.Type.IsUnionType())
{
ObjectType objectType = ResolveObjectType(
completionContext.ResolverContext, completionContext.Type, completionContext.Value);
if (objectType == null)
{
completionContext.ReportError(QueryError.CreateFieldError(
"Could not resolve the schema type from " +
$"`{completionContext.Value.GetType().GetTypeName()}`.",
completionContext.Path,
completionContext.Selection.Selection));
return;
}
CompleteObjectValue(completionContext, objectType);
}
else
{
nextHandler?.Invoke(completionContext);
}
}
public void ReportError(string message)
{
if (string.IsNullOrEmpty(message))
{
throw new ArgumentNullException(nameof(message));
}
ExecutionContext.ReportError(QueryError.CreateFieldError(
message, Path, Selection.Selection));
_integrateResult(null);
}
public IQueryError CreateError(string message)
{
if (string.IsNullOrEmpty(message))
{
throw new ArgumentException(
"A field error mustn't be null or empty.",
nameof(message));
}
return(QueryError.CreateFieldError(
message,
Path,
FieldSelection.Selection));
}
public IError CreateError(string message)
{
if (string.IsNullOrEmpty(message))
{
throw new ArgumentException(
CoreResources.ResolverTask_ErrorMessageIsNull,
nameof(message));
}
return(QueryError.CreateFieldError(
message,
Path,
FieldSelection.Selection));
}
public static object CompleteResolverResult(
this IResolverContext resolverContext,
object resolverResult)
{
if (resolverResult is IResolverResult r)
{
if (r.IsError)
{
return(QueryError.CreateFieldError(
r.ErrorMessage,
resolverContext.Path,
resolverContext.FieldSelection));
}
return(r.Value);
}
return(resolverResult);
}
