public function buildInCondition($operator, $operands)
{
if (!isset($operands[0], $operands[1])) {
throw new InvalidParamException("Operator '{$operator}' requires two operands.");
}
list($column, $values) = $operands;
$values = (array) $values;
$operator = $this->normalizeConditionKeyword($operator);
if (!is_array($column)) {
$columns = [$column];
$values = [$column => $values];
} elseif (count($column) > 1) {
return $this->buildCompositeInCondition($operator, $column, $values);
} else {
$columns = $column;
$values = [$column[0] => $values];
}
$result = [];
foreach ($columns as $column) {
if ($column == '_id') {
$inValues = $this->ensureMongoId($values[$column]);
} else {
$inValues = $values[$column];
}
$inValues = array_values($inValues);
if (count($inValues) === 1 && $operator === '$in') {
$result[$column] = $inValues[0];
} else {
$result[$column][$operator] = $inValues;
}
}
return $result;
}