| protected checkPivotTable ( yii\db\TableSchema $table ) : array | boolean | ||
| $table | yii\db\TableSchema | |
| return | array | boolean | the relevant foreign key constraint information if the table is a junction table, or false if the table is not a junction table. |
protected function checkPivotTable($table)
{
$pk = $table->primaryKey;
if (count($pk) !== 2) {
return false;
}
$fks = [];
foreach ($table->foreignKeys as $refs) {
if (count($refs) === 2) {
if (isset($refs[$pk[0]])) {
$fks[$pk[0]] = [$refs[0], $refs[$pk[0]]];
} elseif (isset($refs[$pk[1]])) {
$fks[$pk[1]] = [$refs[0], $refs[$pk[1]]];
}
}
}
if (count($fks) === 2 && $fks[$pk[0]][0] !== $fks[$pk[1]][0]) {
return $fks;
} else {
return false;
}
}