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/*
* This file is part of the ICanBoogie package.
*
* (c) Olivier Laviale <olivier.laviale@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace ICanBoogie\ActiveRecord;
use ICanBoogie\ActiveRecord;
use ICanBoogie\DateTime;
use ICanBoogie\Prototype\MethodNotDefined;
use ICanBoogie\PrototypeTrait;
/**
* The class offers many features to compose model queries. Most query related
* methods of the {@link Model} class create a {@link Query} object that is returned for
* further specification, such as filters or limits.
*
* @method Query and($conditions, $conditions_args = null, $_ = null) Alias to {@link where()}.
*
* @property-read array $all An array with all the records matching the query.
* @property-read mixed $one The first record matching the query.
* @property-read array $pairs An array of key/value pairs.
* @property-read array $rc The first column of the first row matching the query.
* @property-read int $count The number of records matching the query.
* @property-read bool|array $exists `true` if a record matching the query exists, `false`
* otherwise. If there is multiple records, the property is an array of booleans.
*
* @property-read Model $model The target model of the query.
* @property-read array $joints The joints collection from {@link join()}.
* @property-read array $joints_args The arguments to the joints.
* @property-read array $conditions The conditions collected from {@link where()}, {@link and()},
* `filter_by_*`, and scopes.
* @property-read array $conditions_args The arguments to the conditions.
* @property-read array $having_args The arguments to the `HAVING` clause.
* @property-read array $args Returns the arguments to the query.
* @property-read Query $prepared Return a prepared query.
*/
class Query implements \IteratorAggregate
{
use PrototypeTrait
{
PrototypeTrait::__call as private __prototype_call;
}
const LIMIT_MAX = '18446744073709551615';
/**
* Part of the `SELECT` clause.
*
* @var string
*/
protected $select;
/**
* `JOIN` clauses.
*
* @var array
*/
protected $joints = [];
/**
* @return array
*/
protected function get_joints()
{
return $this->joints;
}
/**
* Joints arguments.
*
* @var array
*/
protected $joints_args = [];
/**
* @return array
*/
protected function get_joints_args()
{
return $this->joints_args;
}
/**
* The conditions collected from {@link where()}, {@link and()}, `filter_by_*`, and scopes.
*
* @var array
*/
protected $conditions = [];
/**
* Return the conditions collected from {@link where()}, {@link and()}, `filter_by_*`,
* and scopes.
*
* @return array
*/
protected function get_conditions()
{
return $this->conditions;
}
/**
* Arguments for the conditions.
*
* @var array
*/
protected $conditions_args = [];
/**
* Return the arguments to the conditions.
*
* @return array
*/
protected function get_conditions_args()
{
return $this->conditions_args;
}
/**
* Part of the `GROUP BY` clause.
*
* @var string
*/
protected $group;
/**
* Part of the `ORDER BY` clause.
*
* @var mixed
*/
protected $order;
/**
* Part of the `HAVING` clause.
*
* @var string
*/
protected $having;
/**
* Arguments to the `HAVING` clause.
*
* @var array
*/
protected $having_args = [];
/**
* Return the arguments to the `HAVING` clause.
*
* @return array
*/
protected function get_having_args()
{
return $this->having_args;
}
/**
* The number of records the skip before fetching.
*
* @var int
*/
protected $offset;
/**
* The maximum number of records to fetch.
*
* @var int
*/
protected $limit;
/**
* Fetch mode.
*
* @var mixed
*/
protected $mode;
/**
* The target model of the query.
*
* @var Model
*/
protected $model;
/**
* @return Model
*/
protected function get_model()
{
return $this->model;
}
/**
* Returns the arguments to the query, which include joints arguments, conditions arguments,
* and _having_ arguments.
*
* @return array
*/
protected function get_args()
{
return array_merge($this->joints_args, $this->conditions_args, $this->having_args);
}
/**
* Constructor.
*
* @param Model $model The model to query.
*/
public function __construct(Model $model)
{
$this->model = $model;
}
/**
* Adds support for model's scopes.
*
* @inheritdoc
*/
public function __get($property)
{
$scopes = $this->get_model_scope();
if (in_array($property, $scopes))
{
return $this->model->scope($property, [ $this ]);
}
return self::accessor_get($property);
}
/**
* Override the method to handle magic 'filter_by_' methods.
*
* @inheritdoc
*/
public function __call($method, $arguments)
{
if ($method === 'and')
{
return call_user_func_array([ $this, 'where' ], $arguments);
}
if (strpos($method, 'filter_by_') === 0)
{
return $this->dynamic_filter(substr($method, 10), $arguments); // 10 is for: strlen('filter_by_')
}
$scopes = $this->get_model_scope();
if (in_array($method, $scopes))
{
array_unshift($arguments, $this);
return $this->model->scope($method, $arguments);
}
try
{
return self::__prototype_call($method, $arguments);
}
catch (MethodNotDefined $e)
{
throw new ScopeNotDefined($method, $this->model, 500, $e);
}
}
/*
* Rendering
*/
/**
* Convert the query into a string.
*
* @return string
*/
public function __toString()
{
return $this->resolve_statement
(
$this->render_select() . ' ' .
$this->render_from() .
$this->render_main()
);
}
/**
* Render the `SELECT` clause.
*
* @return string
*/
protected function render_select()
{
return 'SELECT ' . ($this->select ? $this->select : '*');
}
/**
* Render the `FROM` clause.
*
* The rendered `FROM` clause might include some JOINS too.
*
* @return string
*/
protected function render_from()
{
return 'FROM {self_and_related}';
}
/**
* Renders the `JOIN` clauses.
*
* @return string
*/
protected function render_joints()
{
return implode(' ', $this->joints);
}
/**
* Render the main body of the query, without the `SELECT` and `FROM` clauses.
*
* @return string
*/
protected function render_main()
{
$query = '';
if ($this->joints)
{
$query = ' ' . $this->render_joints();
}
$conditions = $this->conditions;
if ($conditions)
{
$query .= ' WHERE ' . implode(' AND ', $conditions);
}
$group = $this->group;
if ($group)
{
$query .= ' GROUP BY ' . $group;
$having = $this->having;
if ($having)
{
$query .= ' HAVING ' . $having;
}
}
$order = $this->order;
if ($order)
{
$query .= ' ' . $this->render_order($order);
}
$offset = $this->offset;
$limit = $this->limit;
if ($offset || $limit)
{
$query .= ' ' . $this->render_offset_and_limit($offset, $limit);
}
return $query;
}
/**
* Render the `ORDER` clause.
*
* @param mixed $order
*
* @return string
*/
protected function render_order($order)
{
if (count($order) == 1)
{
return 'ORDER BY ' . $order[0];
}
$connection = $this->model->connection;
$field = array_shift($order);
$field_values = is_array($order[0]) ? $order[0] : $order;
$field_values = array_map(function($v) use($connection) {
return $connection->quote($v);
}, $field_values);
return "ORDER BY FIELD($field, " . implode(', ', $field_values) . ")";
}
/**
* Render the `LIMIT` and `OFFSET` clauses.
*
* @param int $offset
* @param int $limit
*
* @return string
*/
protected function render_offset_and_limit($offset, $limit)
{
if ($offset && $limit)
{
return "LIMIT $offset, $limit";
}
else if ($offset)
{
return "LIMIT $offset, " . self::LIMIT_MAX;
}
else if ($limit)
{
return "LIMIT $limit";
}
return '';
}
/*
*
*/
/**
* Resolve the placeholders of a statement.
*
* Note: Currently, the method simply forwards the statement to the model's
* resolve_statement() method.
*
* @param string $statement
*
* @return string
*/
protected function resolve_statement($statement)
{
return $this->model->resolve_statement($statement);
}
/**
* Cache available scopes by model class.
*
* @var array
*/
static protected $scopes_by_classes = [];
/**
* Return the available scopes for a model class.
*
* The method uses reflexion to find the scopes, the result is cached.
*
* @return array
*/
protected function get_model_scope()
{
$class = get_class($this->model);
if (isset(self::$scopes_by_classes[$class]))
{
return self::$scopes_by_classes[$class];
}
$reflexion = new \ReflectionClass($class);
$methods = $reflexion->getMethods(\ReflectionMethod::IS_PROTECTED);
$scopes = [];
foreach ($methods as $method)
{
$name = $method->name;
if (strpos($name, 'scope_') !== 0)
{
continue;
}
$scopes[] = substr($name, 6);
}
return self::$scopes_by_classes[$class] = $scopes;
}
/**
* Define the `SELECT` clause.
*
* @param string $expression The expression of the `SELECT` clause. e.g. 'nid, title'.
*
* @return Query
*/
public function select($expression)
{
$this->select = $expression;
return $this;
}
/**
* Add a `JOIN` clause.
*
* @param string|Query $expression A join can be created from a model reference,
* another query, or a custom `JOIN` clause.
*
* - When `$expression` is a string starting with `:` it is considered as a model
* reference matching the pattern ":<model_id>" where `<model_id>` is the identifier of a model
* that can be retrieved using the model collection associated with the query's model.
*
* - When `$expression` is a {@link Query} instance, it is rendered as a string and used as a
* subquery of the `JOIN` clause. The `$options` parameter can be used to customize the
* output.
*
* - Otherwise `$expression` is considered as a raw `JOIN` clause.
*
* @param array $options Only used if `$expression` is a {@link Query} instance. The following
* options are available:
* - `mode`: Join mode. Default: "INNER"
* - `alias`: The alias of the subquery. Default: The query's model alias.
* - `on`: The column on which to joint is created. Default: The query's model primary key.
*
* <pre>
* <?php
*
* # using a model identifier
*
* $query->join(':nodes');
*
* # using a subquery
*
* $subquery = get_model('updates')
* ->select('updated_at, $subscriber_id, update_hash')
* ->order('updated_at DESC')
*
* $query->join($subquery, [ 'on' => 'subscriber_id' ]);
*
* # using a raw clause
*
* $query->join("INNER JOIN `articles` USING(`nid`)");
* </pre>
*
* @return Query
*/
public function join($expression, $options = [])
{
if (is_string($expression) && $expression{0} == ':')
{
$expression = $this->model->models[substr($expression, 1)];
}
if ($expression instanceof self)
{
$this->join_with_query($expression, $options);
return $this;
}
if ($expression instanceof Model)
{
$this->join_with_model($expression, $options);
return $this;
}
$this->joints[] = $expression;
return $this;
}
/**
* Join a subquery to the query.
*
* @param Query $query
* @param array $options The following options are available:
* - `mode`: Join mode. Default: "INNER".
* - `as`: The alias of the subquery. Default: The query's model alias.
* - `on`: The column on which the joint is created. Default: The query's model primary key.
*/
private function join_with_query(Query $query, array $options = [])
{
$options += [
'mode' => 'INNER',
'as' => $query->model->alias,
'on' => $query->model->primary
];
$mode = $options['mode'];
$as = $options['as'];
$on = $options['on'];
if ($options['on'])
{
$on = $this->render_join_on($options['on'], $as, $query);
}
if ($on)
{
$on = ' ' . $on;
}
$this->joints[] = "$mode JOIN($query) `$as`{$on}";
$this->joints_args = array_merge($this->joints_args, $query->args);
}
/**
* Join a model to the query.
*
* @param Model $model
* @param array $options The following options are available:
* - `mode`: Join mode. Default: "INNER".
* - `alias`: The alias of the model. Default: The model's alias.
* - `on`: The column on which the joint is created, or an _ON_ expression. Default:
* The model's primary key. @todo
*/
private function join_with_model(Model $model, array $options = [])
{
$primary = $this->model->primary;
$model_schema = $model->extended_schema;
if (is_array($primary))
{
foreach ($primary as $column)
{
if (isset($model_schema[$column]))
{
$primary = $column;
break;
}
}
}
else if (empty($model_schema[$primary]))
{
$primary = $model_schema->primary;
if (is_array($primary))
{
$primary = reset($primary);
}
}
$options += [
'mode' => 'INNER',
'as' => $model->alias,
'on' => $primary
];
$mode = $options['mode'];
$as = $options['as'];
$this->joints[] = "$mode JOIN `$model->name` AS `$as` USING(`$primary`)";
}
/**
* Render the `on` join option.
*
* The method tries to determine the best solution between `ON` and `USING`.
*
* @param string $column
* @param string $as
* @param Query $query
*
* @return string
*/
private function render_join_on($column, $as, Query $query)
{
if (isset($query->model->schema[$column]) && isset($this->model->schema[$column]))
{
return "USING(`$column`)";
}
return "ON `$as`.`$column` = `{$this->model->alias}`.`$column`";
}
/**
* Parse the conditions for the {@link where()} and {@link having()} methods.
*
* {@link \DateTime} conditions are converted to strings.
*
* @return array An array made of the condition string and its arguments.
*/
private function deferred_parse_conditions()
{
$args = debug_backtrace(0, 2)[1]['args'];
$conditions = array_shift($args);
if (is_array($conditions))
{
$c = '';
$conditions_args = [];
foreach ($conditions as $column => $arg)
{
if (is_array($arg) || $arg instanceof self)
{
$joined = '';
if (is_array($arg))
{
foreach ($arg as $value)
{
$joined .= ',' . (is_numeric($value) ? $value : $this->model->quote($value));
}
$joined = substr($joined, 1);
}
else
{
$joined = (string) $arg;
$conditions_args = array_merge($conditions_args, $arg->args);
}
$c .= ' AND `' . ($column{0} == '!' ? substr($column, 1) . '` NOT' : $column . '`') . ' IN(' . $joined . ')';
}
else
{
$conditions_args[] = $arg;
$c .= ' AND `' . ($column{0} == '!' ? substr($column, 1) . '` !' : $column . '` ') . '= ?';
}
}
$conditions = substr($c, 5);
}
else
{
$conditions_args = [];
if ($args)
{
if (is_array($args[0]))
{
$conditions_args = $args[0];
}
else
{
#
# We dereference values otherwise the caller would get a corrupted array.
#
foreach ($args as $key => $value)
{
$conditions_args[$key] = $value;
}
}
}
}
foreach ($conditions_args as &$value)
{
if ($value instanceof \DateTime)
{
$value = DateTime::from($value)->utc->as_db;
}
}
return [ $conditions ? '(' . $conditions . ')' : null, $conditions_args ];
}
/**
* Handles dynamic filters.
*
* @param string $filter
* @param array $conditions_args
*
* @return Query
*/
private function dynamic_filter($filter, array $conditions_args = [])
{
$conditions = explode('_and_', $filter);
return $this->where(array_combine($conditions, $conditions_args));
}
/**
* Add conditions to the SQL statement.
*
* Conditions can either be specified as string or array.
*
* 1. Pure string conditions
*
* If you'de like to add conditions to your statement, you could just specify them in there,
* just like `$model->where('order_count = 2');`. This will find all the entries, where the
* `order_count` field's value is 2.
*
* 2. Array conditions
*
* Now what if that number could vary, say as an argument from somewhere, or perhaps from the
* user’s level status somewhere? The find then becomes something like:
*
* `$model->where('order_count = ?', 2);`
*
* or
*
* `$model->where([ 'order_count' => 2 ]);`
*
* Or if you want to specify two conditions, you can do it like:
*
* `$model->where('order_count = ? AND locked = ?', 2, false);`
*
* or
*
* `$model->where([ 'order_count' => 2, 'locked' => false ]);`
*
* Or if you want to specify subset conditions:
*
* `$model->where([ 'order_id' => [ 123, 456, 789 ] ]);`
*
* This will return the orders with the `order_id` 123, 456 or 789.
*
* 3. Modifiers
*
* When using the "identifier" => "value" notation, you can switch the comparison method by
* prefixing the identifier with a bang "!"
*
* `$model->where([ '!order_id' => [ 123, 456, 789 ]]);`
*
* This will return the orders with the `order_id` different than 123, 456 and 789.
*
* `$model->where([ '!order_count' => 2 ];`
*
* This will return the orders with the `order_count` different than 2.
*
* @param mixed $conditions
* @param mixed $conditions_args
* @param mixed $_ [optional]
*
* @return Query
*/
public function where($conditions, $conditions_args = null, $_ = null)
{
list($conditions, $conditions_args) = $this->deferred_parse_conditions();
if ($conditions)
{
$this->conditions[] = $conditions;
if ($conditions_args)
{
$this->conditions_args = array_merge($this->conditions_args, $conditions_args);
}
}
return $this;
}
/**
* Defines the `ORDER` clause.
*
* @param string $order_or_field_name The order for the `ORDER` clause e.g.
* 'weight, date DESC', or field to order with, in which case `$field_values` is required.
* @param array $field_values Values of the field specified by `$order_or_field_name`.
*
* @return Query
*/
public function order($order_or_field_name, $field_values = null)
{
$this->order = func_get_args();
return $this;
}
/**
* Defines the `GROUP` clause.
*
* @param string $group
*
* @return Query
*/
public function group($group)
{
$this->group = $group;
return $this;
}
/**
* Defines the `HAVING` clause.
*
* @param mixed $conditions
* @param mixed $conditions_args
*
* @return Query
*/
public function having($conditions, $conditions_args = null)
{
if (!$this->group)
{
throw new \LogicException("having() cannot be used without invoking group() first.");
}
list($having, $having_args) = $this->deferred_parse_conditions();
$this->having = $having;
$this->having_args = $having_args;
return $this;
}
/**
* Define the offset of the `LIMIT` clause.
*
* @param $offset
*
* @return Query
*/
public function offset($offset)
{
$this->offset = (int) $offset;
return $this;
}
/**
* Apply the limit and/or offset to the SQL fired.
*
* You can use the limit to specify the number of records to be retrieved, ad use the offset to
* specify the number of records to skip before starting to return records:
*
* $model->limit(10);
*
* Will return a maximum of 10 clients and because ti specifies no offset it will return the
* first 10 in the table:
*
* $model->limit(5, 10);
*
* Will return a maximum of 10 clients beginning with the 5th.
*
* @param int $limit
*
* @return Query
*/
public function limit($limit)
{
$offset = null;
if (func_num_args() == 2)
{
$offset = $limit;
$limit = func_get_arg(1);
}
$this->offset = (int) $offset;
$this->limit = (int) $limit;
return $this;
}
/**
* Set the fetch mode for the query.
*
* @param mixed $mode
*
* @return Query
*
* @see http://www.php.net/manual/en/pdostatement.setfetchmode.php
*/
public function mode($mode)
{
$this->mode = func_get_args();
return $this;
}
/**
* Prepare the query.
*
* We use the connection's prepare() method because the statement has already been resolved
* during the __toString() method and we don't want for the statement to be parsed twice.
*
* @return Statement
*/
protected function prepare()
{
return $this->model->connection->prepare((string) $this);
}
/**
* Return a prepared query.
*
* @return Statement
*/
protected function get_prepared()
{
return $this->prepare();
}
/**
* Prepare and executes the query.
*
* @return Statement
*/
public function query()
{
$statement = $this->prepare();
$statement->execute($this->args);
return $statement;
}
/*
* FINISHER
*/
/**
* Resolves fetch mode from backtrace.
*
* @return array
*/
private function resolve_fetch_mode()
{
$trace = debug_backtrace(0, 2);
if ($trace[1]['args'])
{
$args = $trace[1]['args'];
}
else if ($this->mode)
{
$args = $this->mode;
}
else if ($this->select)
{
$args = [ \PDO::FETCH_ASSOC ];
}
else if ($this->model->activerecord_class)
{
$args = [ \PDO::FETCH_CLASS, $this->model->activerecord_class, [ $this->model ]];
}
else
{
$args = [ \PDO::FETCH_CLASS, ActiveRecord::class, [ $this->model ]];
}
return $args;
}
/**
* Execute the query and returns an array of records.
*
* @param mixed $_ [optional]
*
* @return array
*/
public function all($_ = null)
{
$statement = $this->query();
$args = $this->resolve_fetch_mode();
return call_user_func_array([ $statement, 'fetchAll' ], $args);
}
/**
* Getter for the {@link $all} magic property.
*
* @return array
*/
protected function get_all()
{
return $this->all();
}
/**
* Return the first result of the query and close the cursor.
*
* @param $_ [optional] Fetch mode.
*
* @return mixed The return value of this function on success depends on the fetch mode. In
* all cases, FALSE is returned on failure.
*/
public function one($_ = null)
{
$query = clone $this;
$query->limit = 1;
$statement = $query->query();
$args = $query->resolve_fetch_mode();
if (count($args) > 1 && $args[0] == \PDO::FETCH_CLASS)
{
array_shift($args);
$rc = call_user_func_array([ $statement, 'fetchObject' ], $args);
$statement->closeCursor();
return $rc;
}
return call_user_func_array([ $statement, 'one' ], $args);
}
/**
* Getter for the {@link $one} magic property.
*
* @return mixed
*
* @see one()
*/
protected function get_one()
{
return $this->one();
}
/**
* Execute que query and return an array of key/value pairs, where the key is the value of
* the first column and the value of the key the value of the second column.
*
* @return array
*/
protected function get_pairs()
{
return $this->all(\PDO::FETCH_KEY_PAIR);
}
/**
* Return the value of the first column of the first row.
*
* @return string
*/
protected function get_rc()
{
$previous_limit = $this->limit;
$this->limit = 1;
$statement = $this->query();
$this->limit = $previous_limit;
return $statement->rc;
}
/**
* Check the existence of records in the model.
*
* $model->exists;
* $model->where('name = "max"')->exists;
* $model->exists(1);
* $model->exists(1, 2);
* $model->exists([ 1, 2 ]);
*
* @param mixed $key
*
* @return bool|array
*/
public function exists($key = null)
{
if ($key !== null && func_num_args() > 1)
{
$key = func_get_args();
}
$query = clone $this;
#
# Checking if the query matches any record.
#
if ($key === null)
{
return !!$query
->select('1')
->limit(1)
->rc;
}
#
# Checking if the query matches the specified record keys.
#
$rc = $query
->select('`{primary}`')
->and([ '{primary}' => $key ])
->limit(0, 0)
->all(\PDO::FETCH_COLUMN);
if ($rc && is_array($key))
{
$exists = array_combine($key, array_fill(0, count($key), false));
foreach ($rc as $key)
{
$exists[$key] = true;
}
foreach ($exists as $v)
{
if (!$v)
{
return $exists;
}
}
# all true
return true;
}
return !empty($rc);
}
/**
* Getter for the {@link $exists} magic property.
*
* @return bool|array
*
* @see exists()
*/
protected function get_exists()
{
return $this->exists();
}
/**
* Handle all the computations.
*
* @param string $method
* @param string $column
*
* @return int|array
*/
private function compute($method, $column)
{
$query = 'SELECT ';
if ($column)
{
if ($method == 'COUNT')
{
$query .= "`$column`, $method(`$column`)";
$this->group($column);
}
else
{
$query .= "$method(`$column`)";
}
}
else
{
$query .= $method . '(*)';
}
$query .= ' AS count ' . $this->render_from() . $this->render_main();
$query = $this->model->query($query, $this->args);
if ($method == 'COUNT' && $column)
{
return $query->fetchAll(\PDO::FETCH_KEY_PAIR);
}
return (int) $query->rc;
}
/**
* Implement the 'COUNT' computation.
*
* @param string $column The name of the column to count.
*
* @return int|array
*/
public function count($column = null)
{
return $this->compute('COUNT', $column);
}
/**
* Getter for the {@link $count} magic property.
*
* @return int
*/
protected function get_count()
{
return $this->count();
}
/**
* Implement the 'AVG' computation.
*
* @param string $column
*
* @return int
*/
public function average($column)
{
return $this->compute('AVG', $column);
}
/**
* Implement the 'MIN' computation.
*
* @param string $column
*
* @return int
*/
public function minimum($column)
{
return $this->compute('MIN', $column);
}
/**
* Implement the 'MAX' computation.
*
* @param string $column
*
* @return int
*/
public function maximum($column)
{
return $this->compute('MAX', $column);
}
/**
* Implement the 'SUM' computation.
*
* @param string $column
*
* @return int
*/
public function sum($column)
{
return $this->compute('SUM', $column);
}
/**
* Delete the records matching the conditions and limits of the query.
*
* @param string $tables When using a JOIN, `$tables` is used to specify the tables in which
* records should be deleted. Default: The alias of queried model, only if at least one join
* clause has been defined using the {@link join()} method.
*
* @return bool The result of the operation.
*
* @todo-20140901: reflect on join to add the required tables by default, discarding tables
* joined with the LEFT mode.
*/
public function delete($tables = null)
{
if (!$tables && $this->joints)
{
$tables = "`{alias}`";
}
if ($tables)
{
$query = "DELETE {$tables} FROM {self} AS `{alias}`";
}
else
{
$query = "DELETE FROM {self}";
}
$query .= $this->render_main();
return $this->model->execute($query, $this->args);
}
/**
* Return an iterator for the query.
*/
public function getIterator()
{
return new \ArrayIterator($this->all());
}
}