public static object CoerceArgumentValue(
ISchema schema,
IReadOnlyDictionary <string, object> coercedVariableValues,
string argumentName,
Argument argumentDefinition,
GraphQLArgument argument)
{
var argumentType = argumentDefinition.Type;
var defaultValue = argumentDefinition.DefaultValue;
var argumentValue = argument?.Value;
var hasValue = argumentValue != null;
object value = null;
if (argumentValue is GraphQLVariable variable)
{
if (coercedVariableValues == null)
{
hasValue = false;
}
else
{
var variableName = variable.Name.Value;
hasValue = coercedVariableValues.ContainsKey(variableName);
if (hasValue)
{
value = coercedVariableValues[variableName];
}
}
}
else
{
value = argumentValue;
}
if (argumentType is NonNull && (!hasValue || value == null))
{
throw new ValueCoercionException(
$"Argument '{argumentName}' is non-null but no value could be coerced",
null,
argumentType);
}
if (hasValue)
{
if (value == null)
{
return(null);
}
if (argumentValue is GraphQLVariable)
{
return(value);
}
var coercedValue = Values.CoerceValue(
schema.GetInputFields,
value,
argumentType);
return(coercedValue);
}
return(defaultValue);
}