/**
  * Construct the syntax to drop a column.
  *
  * @param  Field $field
  * @return string
  */
 private function dropColumn(Field $field)
 {
     $syntax = '';
     if ($field->hasForeign() && ($this->generateForeign || $this->onlyForeign)) {
         $syntax .= sprintf("\$table->dropForeign('%s');", $this->getForeignKeyName($field, true)) . "\n" . str_repeat(' ', 12);
     }
     if (!$this->onlyForeign) {
         $syntax .= sprintf("\$table->dropColumn('%s');", $field->getName());
     }
     return $syntax;
 }