public static IValue AstFromValue(this object value, ISchema schema, IGraphType type)
{
if (type is NonNullGraphType)
{
var nonnull = (NonNullGraphType)type;
return(AstFromValue(value, schema, nonnull.ResolvedType));
}
if (value == null || type == null)
{
return(new NullValue());
}
// Convert IEnumerable to GraphQL list. If the GraphQLType is a list, but
// the value is not an IEnumerable, convert the value using the list's item type.
if (type is ListGraphType)
{
var listType = (ListGraphType)type;
var itemType = listType.ResolvedType;
if (!(value is string) && value is IEnumerable)
{
var list = (IEnumerable)value;
var values = list.Map(item => AstFromValue(item, schema, itemType));
return(new ListValue(values));
}
return(AstFromValue(value, schema, itemType));
}
// Populate the fields of the input object by creating ASTs from each value
// in the dictionary according to the fields in the input type.
if (type is IInputObjectGraphType)
{
if (!(value is Dictionary <string, object>))
{
return(null);
}
var input = (IInputObjectGraphType)type;
var dict = (Dictionary <string, object>)value;
var fields = dict
.Select(pair =>
{
var fieldType = input.GetField(pair.Key)?.ResolvedType;
return(new ObjectField(pair.Key, AstFromValue(pair.Value, schema, fieldType)));
})
.ToList();
return(new ObjectValue(fields));
}
Invariant.Check(
type.IsInputType(),
$"Must provide Input Type, cannot use: {type}");
var inputType = type as ScalarGraphType;
// Since value is an internally represented value, it must be serialized
// to an externally represented value before converting into an AST.
var serialized = inputType.Serialize(value);
if (serialized == null)
{
return(null);
}
if (serialized is bool)
{
return(new BooleanValue((bool)serialized));
}
if (serialized is int)
{
return(new IntValue((int)serialized));
}
if (serialized is long)
{
return(new LongValue((long)serialized));
}
if (serialized is decimal)
{
return(new DecimalValue((decimal)serialized));
}
if (serialized is double)
{
return(new FloatValue((double)serialized));
}
if (serialized is DateTime)
{
return(new DateTimeValue((DateTime)serialized));
}
if (serialized is Uri uri)
{
return(new UriValue(uri));
}
if (serialized is DateTimeOffset)
{
return(new DateTimeOffsetValue((DateTimeOffset)serialized));
}
if (serialized is TimeSpan)
{
return(new TimeSpanValue((TimeSpan)serialized));
}
if (serialized is string)
{
if (type is EnumerationGraphType)
{
return(new EnumValue(serialized.ToString()));
}
return(new StringValue(serialized.ToString()));
}
var converter = schema.FindValueConverter(serialized, type);
if (converter != null)
{
return(converter.Convert(serialized, type));
}
throw new ExecutionError($"Cannot convert value to AST: {serialized}");
}