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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\OffsetNotWritable;
use ICanBoogie\Prototype\MethodNotDefined;
/**
* Base class for activerecord models.
*
* @method Query select() select($expression) The method is forwarded to {@link Query::select}.
* @method Query join() join($expression) The method is forwarded to {@link Query::join}.
* @method Query where() where($conditions, $conditions_args = null, $_ = null) The method is forwarded to {@link Query::where}.
* @method Query group() group($group) The method is forwarded to {@link Query::group}.
* @method Query order() order($order) The method is forwarded to {@link Query::order}.
* @method Query limit() limit($limit, $offset = null) The method is forwarded to {@link Query::limit}.
* @method Query offset() offset($offset) The method is forwarded to {@link Query::offset}.
* @method bool exists() exists($key = null) The method is forwarded to {@link Query::exists}.
* @method mixed count() count($column = null) The method is forwarded to {@link Query::count}.
* @method string average() average($column) The method is forwarded to {@link Query::average}.
* @method string maximum() maximum($column) The method is forwarded to {@link Query::maximum}.
* @method string minimum() minimum($column) The method is forwarded to {@link Query::minimum}.
* @method int sum() sum($column) The method is forwarded to {@link Query::sum}.
* @method array all() all() The method is forwarded to {@link Query::all}.
* @method ActiveRecord one() one() The method is forwarded to {@link Query::one}.
* @method ActiveRecord new() new(array $properties = []) Instantiate a new record.
*
* @method Model belongs_to() belongs_to($definition) Add a _belongs_to_ relation.
* @method Model has_many() has_many($related, $options = []) Adds a _has_many_ relation.
*
* @property-read Model|null $parent Parent model.
* @property-read ModelCollection $models
* @property-read array $all Retrieve all the records from the model.
* @property-read string $activerecord_class Class of the active records of the model.
* @property-read int $count The number of records of the model.
* @property-read bool $exists Whether the SQL table associated with the model exists.
* @property-read string $id The identifier of the model.
* @property-read ActiveRecord $one Retrieve the first record from the mode.
* @property ActiveRecordCache $activerecord_cache The cache use to store activerecords.
* @property-read Model $parent_model The parent model.
* @property-read Relation[] $relations The relations of this model to other models.
*/
class Model extends Table implements \ArrayAccess
{
const ACTIVERECORD_CLASS = 'activerecord_class';
const BELONGS_TO = 'belongs_to';
const CLASSNAME = 'class';
const HAS_MANY = 'has_many';
const ID = 'id';
/**
* @var ModelCollection
*/
private $models;
protected function get_models()
{
return $this->models;
}
/**
* Active record instances class.
*
* @var string
*/
protected $activerecord_class;
/**
* Attributes of the model.
*
* @var array[string]mixed
*/
protected $attributes;
/**
* The parent model of the model.
*
* The parent model and the {@link parent} may be different if the model does not have a
* schema but inherits it from its parent.
*
* @var Model
*/
protected $parent_model;
/**
* Return the parent mode.
*
* @return Model
*/
protected function get_parent_model()
{
return $this->parent_model;
}
/**
* The relations of this model to other models.
*
* @var RelationCollection
*/
protected $relations;
/**
* Return the relations of this model to other models.
*
* @return RelationCollection
*/
protected function get_relations()
{
return $this->relations;
}
/**
* Returns the records cache.
*
* **Note:** The method needs to be implemented through prototype bindings.
*
* @return ActiveRecordCache
*/
protected function lazy_get_activerecord_cache()
{
return parent::lazy_get_activerecord_cache();
}
/**
* Override the constructor to provide support for the {@link ACTIVERECORD_CLASS} tag and
* extended support for the {@link EXTENDING} tag.
*
* If {@link EXTENDING} is defined but the model has no schema ({@link SCHEMA} is empty),
* the name of the model and the schema are inherited from the extended model and
* {@link EXTENDING} is set to the parent model object. If {@link ACTIVERECORD_CLASS} is
* empty, its value is set to the extended model's active record class.
*
* If {@link ACTIVERECORD_CLASS} is set, its value is saved in the
* {@link $activerecord_class} property.
*
* @param ModelCollection $models
* @param array $attributes Attributes used to construct the model.
*/
public function __construct(ModelCollection $models, array $attributes)
{
$this->models = $models;
$this->attributes = $attributes = $this->resolve_attributes($attributes);
$this->parent = $attributes[self::EXTENDING];
$this->relations = new RelationCollection($this);
parent::__construct($attributes);
#
# Resolve the active record class.
#
$this->activerecord_class = $this->resolve_activerecord_class();
$this->resolve_relations();
}
/**
* Resolves constructor attributes.
*
* The method may initialize the {@link $parent_model} property.
*
* @param array $attributes
*
* @return array
*/
private function resolve_attributes(array $attributes)
{
$attributes += [
self::ACTIVERECORD_CLASS => null,
self::BELONGS_TO => null,
self::EXTENDING => null,
self::HAS_MANY => null,
self::ID => null,
self::SCHEMA => null
];
if (!$attributes[self::ID])
{
$attributes[self::ID] = $attributes[self::NAME];
}
$this->parent_model = $extends = $attributes[self::EXTENDING];
if ($extends && !$attributes[self::SCHEMA])
{
$attributes[self::NAME] = $extends->unprefixed_name;
$attributes[self::SCHEMA] = $extends->schema_options;
$attributes[self::EXTENDING] = $extends->parent;
if (!$attributes[self::ACTIVERECORD_CLASS])
{
$attributes[self::ACTIVERECORD_CLASS] = $extends->activerecord_class;
}
}
return $attributes;
}
/**
* Resolves ActiveRecord class.
*
* @return string
*/
private function resolve_activerecord_class()
{
$activerecord_class = $this->attributes[self::ACTIVERECORD_CLASS];
if (!$activerecord_class && $this->parent)
{
$activerecord_class = $this->parent->activerecord_class;
}
return $activerecord_class;
}
/**
* Resolves relations with other models.
*/
private function resolve_relations()
{
$attributes = $this->attributes;
# belongs_to
$belongs_to = $attributes[self::BELONGS_TO];
if ($belongs_to)
{
$this->belongs_to($belongs_to);
}
# has_many
$has_many = $attributes[self::HAS_MANY];
if ($has_many)
{
$this->has_many($has_many);
}
}
/**
* Handles query methods, dynamic filters, scopes, and relations.
*
* @inheritdoc
*/
public function __call($method, $arguments)
{
if ($method == 'new')
{
return call_user_func_array([ $this, 'new_record' ], $arguments);
}
if (is_callable([ Query::class, $method ])
|| strpos($method, 'filter_by_') === 0
|| method_exists($this, 'scope_' . $method))
{
$query = new Query($this);
return call_user_func_array([ $query, $method ], $arguments);
}
if (is_callable([ RelationCollection::class, $method ]))
{
return call_user_func_array([ $this->relations, $method ], $arguments);
}
return parent::__call($method, $arguments);
}
/**
* Overrides the method to handle scopes.
*
* @inheritdoc
*/
public function __get($property)
{
$method = 'scope_' . $property;
if (method_exists($this, $method))
{
return $this->$method(new Query($this));
}
return parent::__get($property);
}
/**
* Returns the identifier of the model.
*
* @return string
*/
protected function get_id()
{
return $this->attributes[self::ID];
}
/**
* Returns the class of the active records of the model.
*
* @return string
*/
protected function get_activerecord_class()
{
return $this->activerecord_class;
}
/**
* Finds a record or a collection of records.
*
* @param mixed $key A key, multiple keys, or an array of keys.
*
* @throws RecordNotFound when the record, or one or more records of the records
* set, could not be found.
*
* @return ActiveRecord|ActiveRecord[] A record or a set of records.
*/
public function find($key)
{
$args = func_get_args();
$n = count($args);
if (!$n)
{
throw new \BadMethodCallException("Expected at least one argument.");
}
if (count($args) == 1)
{
$key = $args[0];
if (!is_array($key))
{
return $this->find_one($key);
}
$args = $key;
}
return $this->find_many($args);
}
/**
* Finds one records.
*
* @param string|int $key
*
* @return ActiveRecord
*/
private function find_one($key)
{
$record = $this->activerecord_cache->retrieve($key);
if ($record)
{
return $record;
}
$record = $this->where([ $this->primary => $key ])->one;
if (!$record)
{
throw new RecordNotFound
(
"Record <q>{$key}</q> does not exists in model <q>{$this->id}</q>.", [ $key => null ]
);
}
$this->activerecord_cache->store($record);
return $record;
}
/**
* Finds many records.
*
* @param array $keys
*
* @return ActiveRecord[]
*/
private function find_many(array $keys)
{
$records = array_combine($keys, array_fill(0, count($keys), null));
$missing = $records;
foreach ($records as $key => $dummy)
{
$record = $this->activerecord_cache->retrieve($key);
if (!$record)
{
continue;
}
$records[$key] = $record;
unset($missing[$key]);
}
if ($missing)
{
$primary = $this->primary;
$query_records = $this->where([ $primary => array_keys($missing) ])->all;
foreach ($query_records as $record)
{
$key = $record->$primary;
$records[$key] = $record;
unset($missing[$key]);
$this->activerecord_cache->store($record);
}
}
if ($missing)
{
if (count($missing) > 1)
{
throw new RecordNotFound
(
"Records " . implode(', ', array_keys($missing)) . " do not exists in model <q>{$this->id}</q>.", $records
);
}
$key = array_keys($missing);
$key = array_shift($key);
throw new RecordNotFound
(
"Record <q>{$key}</q> does not exists in model <q>{$this->id}</q>.", $records
);
}
return $records;
}
/**
* Because records are cached, we need to remove the record from the cache when it is saved,
* so that loading the record again returns the updated record, not the one in the cache.
*
* @inheritdoc
*/
public function save(array $properties, $key = null, array $options = [])
{
if ($key)
{
$this->activerecord_cache->eliminate($key);
}
return parent::save($properties, $key, $options);
}
/**
* Eliminates the record from the cache.
*
* @inheritdoc
*/
public function delete($key)
{
$this->activerecord_cache->eliminate($key);
return parent::delete($key);
}
/**
* Checks that the SQL table associated with the model exists.
*
* @return bool
*/
protected function get_exists()
{
return $this->exists();
}
/**
* Returns the number of records of the model.
*
* @return int
*/
protected function get_count()
{
return $this->count();
}
/**
* Returns all the records of the model.
*
* @return ActiveRecord[]
*/
protected function get_all()
{
return $this->all();
}
/**
* Returns the first record of the model.
*
* @return ActiveRecord
*/
protected function get_one()
{
return $this->one();
}
/**
* Checks if the model has a given scope.
*
* Scopes are defined using method with the "scope_" prefix. As an example, the `visible`
* scope can be defined by implementing the `scope_visible` method.
*
* @param string $name Scope name.
*
* @return boolean
*/
public function has_scope($name)
{
return method_exists($this, 'scope_' . $name);
}
/**
* Invokes a given scope.
*
* @param string $scope_name Name of the scope to apply to the query.
* @param array $scope_args Arguments to forward to the scope method. The first argument must
* be a {@link Query} instance.
*
* @throws ScopeNotDefined when the specified scope is not defined.
*
* @return Query
*/
public function scope($scope_name, array $scope_args = [])
{
try
{
return call_user_func_array([ $this, 'scope_' . $scope_name ], $scope_args);
}
catch (MethodNotDefined $e)
{
throw new ScopeNotDefined($scope_name, $this);
}
}
/**
* @inheritdoc
*
* @throws OffsetNotWritable when one tries to write an offset.
*/
public function offsetSet($offset, $value)
{
throw new OffsetNotWritable([ $offset, $this ]);
}
/**
* Alias to {@link exists()}.
*
* @param int $key ActiveRecord identifier.
*
* @return bool
*/
public function offsetExists($key)
{
return $this->exists($key);
}
/**
* Alias to {@link delete()}.
*
* @param int $key ActiveRecord identifier.
*/
public function offsetUnset($key)
{
$this->delete($key);
}
/**
* Alias to {@link find()}.
*
* @param int $key ActiveRecord identifier.
*
* @return ActiveRecord
*/
public function offsetGet($key)
{
return $this->find($key);
}
/**
* Creates a new ActiveRecord instance.
*
* The class of the instance is defined by the {@link $activerecord_class} property.
*
* @param array $properties Optional properties to instantiate the record with.
*
* @return ActiveRecord
*/
protected function new_record(array $properties = [])
{
$class = $this->activerecord_class;
return $properties ? $class::from($properties, [ $this ]) : new $class($this);
}
}