function Schema::dropField

Overrides Schema::dropField

File

core/modules/sqlite/src/Driver/Database/sqlite/Schema.php, line 574

Class

Schema

SQLite implementation of \Drupal\Core\Database\Schema.

Namespace

Code

public function dropField($table, $field) {
    if (!$this->fieldExists($table, $field)) {
        return FALSE;
    }
    $old_schema = $this->introspectSchema($table);
    $new_schema = $old_schema;
    unset($new_schema['fields'][$field]);
    // Drop the primary key if the field to drop is part of it. This is
    // consistent with the behavior on PostgreSQL.
    // @see \Drupal\mysql\Driver\Database\mysql\Schema::dropField()
    if (isset($new_schema['primary key']) && in_array($field, $new_schema['primary key'], TRUE)) {
        unset($new_schema['primary key']);
    }
    // Handle possible index changes.
    foreach ($new_schema['indexes'] as $index => $fields) {
        foreach ($fields as $key => $field_name) {
            if ($field_name == $field) {
                unset($new_schema['indexes'][$index][$key]);
            }
        }
        // If this index has no more fields then remove it.
        if (empty($new_schema['indexes'][$index])) {
            unset($new_schema['indexes'][$index]);
        }
    }
    $this->alterTable($table, $old_schema, $new_schema);
    return TRUE;
}