protected function _tables()
{
// Prepare an array to hold tables
$tables = array();
// Create a new database table with name and database
$table = new Database_Table($this->_model->table(), $this->_db);
// Get the model's primary keys as an array
$model_pks = is_array($this->_model->primary_key()) ? $this->_model->primary_key() : array($this->_model->primary_key());
// Loop through each field within the model
foreach ($this->_model->fields() as $field) {
// Check if the field implaments the migratable field interface
if ($field instanceof Jelly_Field_Migratable) {
// Loop through each column in the field
foreach ($field->columns() as $column) {
// Add the column to the table
$table->add_column($column);
}
} elseif ($field->in_db) {
// If the field is unique
if ($field->unique) {
// Add a unique constraint to the table
$table->add_constraint(new Database_Constraint_Unique($field->column));
}
// Loop through every column in the model
foreach ($this->_columns($field, $table) as $column) {
// Add the column to the table
$table->add_column($column);
}
} elseif ($field instanceof Jelly_Field_ManyToMany) {
// ManyToMany fields also contain a pivot table
$pivot = new Database_Table($field->through['model'], $this->_db);
// Get fields
$columns = $field->through['columns'];
foreach ($columns as $field) {
// Chekt if the field names are defaults
if (strstr($field, ':')) {
list($model, $field) = explode(':', $field);
// Append the : back onto $field, it's key for recognizing the alias below
$field = ':' . $field;
// We should be able to find a valid meta object here
if (FALSE == ($meta = Jelly::meta($model))) {
throw new Kohana_Exception('Meta data for :model was not found while trying to resolve :field', array(':model' => $model, ':field' => $field));
}
$field = $meta->foreign_key();
}
$column = Database_Column::factory('int');
$column->auto_increment = FALSE;
$column->name = $field;
$cols[] = $column;
}
// Add to pivot
foreach ($cols as $column) {
// Add it to the pivot table
$pivot->add_column($column);
}
// Add a primary key constraint on all fields within the pivot table
$pivot->add_constraint(new Database_Constraint_Primary(array_keys($pivot->columns()), $pivot->name));
/**
* @todo It would be more than appropriate to add a contstraint in a following
* form into a database:
ALTER TABLE `roles_users`
ADD CONSTRAINT `roles_users_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE,
*
*/
// Add the pivot table to the list of tables
$tables[] = $pivot;
}
}
// Add the primary key constraints to the table
$table->add_constraint(new Database_Constraint_Primary($model_pks, $table->name));
// Add the table to the list
$tables[] = $table;
// And return all tables.
return $tables;
}