457 lines
10 KiB
PHP
457 lines
10 KiB
PHP
<?php namespace System\DB;
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use System\Str;
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use System\Config;
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use System\Inflector;
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abstract class Eloquent {
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/**
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* Indicates if the model exists in the database.
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*
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* @var bool
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*/
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public $exists = false;
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/**
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* The model's attributes.
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*
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* Typically, a model has an attribute for each column on the table.
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*
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* @var array
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*/
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public $attributes = array();
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/**
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* The model's dirty attributes.
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*
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* @var array
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*/
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public $dirty = array();
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/**
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* The model's ignored attributes.
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*
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* Ignored attributes will not be saved to the database, and are
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* primarily used to hold relationships.
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*
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* @var array
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*/
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public $ignore = array();
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/**
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* The relationships that should be eagerly loaded.
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*
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* @var array
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*/
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public $includes = array();
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/**
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* The relationship type the model is currently resolving.
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*
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* @var string
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*/
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public $relating;
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/**
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* The foreign key of the "relating" relationship.
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*
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* @var string
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*/
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public $relating_key;
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/**
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* The table name of the model being resolved.
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*
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* This is used during many-to-many eager loading.
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*
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* @var string
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*/
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public $relating_table;
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/**
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* The model query instance.
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*
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* @var Query
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*/
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public $query;
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/**
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* Create a new Eloquent model instance.
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*
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* @param array $attributes
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* @return void
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*/
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public function __construct($attributes = array())
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{
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foreach ($attributes as $key => $value)
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{
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$this->$key = $value;
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}
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}
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/**
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* Get the table name for a model.
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*
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* @param string $class
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* @return string
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*/
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public static function table($class)
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{
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if (property_exists($class, 'table'))
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{
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return $class::$table;
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}
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return strtolower(Inflector::plural($class));
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}
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/**
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* Factory for creating new Eloquent model instances.
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*
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* @param string $class
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* @return object
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*/
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public static function make($class)
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{
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$model = new $class;
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// Since this method is only used for instantiating/ models for querying
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// purposes, we will go ahead and set the Query instance on the model.
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$model->query = Query::table(static::table($class));
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return $model;
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}
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/**
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* Create a new model instance and set the relationships
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* that should be eagerly loaded.
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*
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* @return mixed
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*/
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public static function with()
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{
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$model = static::make(get_called_class());
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$model->includes = func_get_args();
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return $model;
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}
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/**
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* Get a model by the primary key.
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*
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* @param int $id
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* @return mixed
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*/
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public static function find($id)
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{
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return static::make(get_called_class())->where('id', '=', $id)->first();
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}
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/**
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* Get an array of models from the database.
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*
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* @return array
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*/
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private function _get()
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{
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return Eloquent\Hydrator::hydrate($this);
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}
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/**
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* Get the first model result
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*
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* @return mixed
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*/
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private function _first()
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{
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return (count($results = Eloquent\Hydrator::hydrate($this->take(1))) > 0) ? reset($results) : null;
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}
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/**
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* Retrieve the query for a 1:1 relationship.
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*
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* @param string $model
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* @param string $foreign_key
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* @return mixed
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*/
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public function has_one($model, $foreign_key = null)
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{
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$this->relating = __FUNCTION__;
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return $this->has_one_or_many($model, $foreign_key);
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}
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/**
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* Retrieve the query for a 1:* relationship.
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*
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* @param string $model
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* @param string $foreign_key
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* @return mixed
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*/
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public function has_many($model, $foreign_key = null)
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{
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$this->relating = __FUNCTION__;
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return $this->has_one_or_many($model, $foreign_key);
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}
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/**
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* Retrieve the query for a 1:1 or 1:* relationship.
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*
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* @param string $model
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* @param string $foreign_key
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* @return mixed
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*/
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private function has_one_or_many($model, $foreign_key)
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{
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// The default foreign key for has one and has many relationships is the name
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// of the model with an appended _id. For example, the foreign key for a
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// User model would be user_id. Photo would be photo_id, etc.
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$this->relating_key = (is_null($foreign_key)) ? strtolower(get_class($this)).'_id' : $foreign_key;
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return static::make($model)->where($this->relating_key, '=', $this->id);
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}
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/**
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* Retrieve the query for a 1:1 belonging relationship.
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*
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* @param string $model
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* @param string $foreign_key
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* @return mixed
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*/
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public function belongs_to($model, $foreign_key = null)
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{
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$this->relating = __FUNCTION__;
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if ( ! is_null($foreign_key))
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{
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$this->relating_key = $foreign_key;
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}
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else
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{
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// The default foreign key for belonging relationships is the name of the
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// relationship method name with _id. So, if a model has a "manager" method
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// returning a belongs_to relationship, the key would be manager_id.
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list(, $caller) = debug_backtrace(false);
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$this->relating_key = $caller['function'].'_id';
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}
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return static::make($model)->where('id', '=', $this->attributes[$this->relating_key]);
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}
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/**
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* Retrieve the query for a *:* relationship.
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*
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* @param string $model
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* @param string $table
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* @return mixed
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*/
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public function has_and_belongs_to_many($model, $table = null)
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{
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$this->relating = __FUNCTION__;
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if ( ! is_null($table))
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{
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$this->relating_table = $table;
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}
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else
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{
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// By default, the intermediate table name is the plural names of the models
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// arranged alphabetically and concatenated with an underscore.
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$models = array(Inflector::plural($model), Inflector::plural(get_class($this)));
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sort($models);
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$this->relating_table = strtolower($models[0].'_'.$models[1]);
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}
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// The default foreign key for many-to-many relations is the name of the model with an appended _id.
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// This is the same convention as has_one and has_many.
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$this->relating_key = strtolower(get_class($this)).'_id';
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return static::make($model)
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->select(static::table($model).'.*')
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->join($this->relating_table, static::table($model).'.id', '=', $this->relating_table.'.'.strtolower($model).'_id')
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->where($this->relating_table.'.'.$this->relating_key, '=', $this->id);
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}
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/**
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* Save the model to the database.
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*
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* @return bool
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*/
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public function save()
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{
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if ($this->exists and count($this->dirty) == 0)
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{
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return true;
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}
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$model = get_class($this);
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// Since the model was instantiated using "new", a query instance has not been set.
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$this->query = Query::table(static::table($model));
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// Set the creation and update timestamps.
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if (property_exists($model, 'timestamps') and $model::$timestamps)
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{
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$this->updated_at = date('Y-m-d H:i:s');
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if ( ! $this->exists)
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{
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$this->created_at = $this->updated_at;
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}
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}
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// If the model already exists in the database, we only need to update it.
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// Otherwise, we'll insert the model into the database.
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if ($this->exists)
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{
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$result = $this->query->where('id', '=', $this->attributes['id'])->update($this->dirty) == 1;
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}
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else
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{
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$this->attributes['id'] = $this->query->insert_get_id($this->attributes);
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$result = $this->exists = is_numeric($this->id);
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}
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$this->dirty = array();
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return $result;
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}
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/**
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* Delete a model from the database.
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*
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* @param int $id
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* @return int
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*/
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public function delete($id = null)
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{
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if ($this->exists)
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{
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return Query::table(static::table(get_class($this)))->delete($this->id);
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}
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return 0;
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}
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/**
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* Magic method for retrieving model attributes.
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*/
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public function __get($key)
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{
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// Check the ignored attributes first. These attributes hold all of the
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// loaded relationships for the model.
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if (array_key_exists($key, $this->ignore))
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{
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return $this->ignore[$key];
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}
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// Is the attribute actually a relationship method? If it is, return the
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// models for the relationship.
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if (method_exists($this, $key))
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{
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$model = $this->$key();
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return ($this->relating == 'has_one' or $this->relating == 'belongs_to')
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? $this->ignore[$key] = $model->first()
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: $this->ignore[$key] = $model->get();
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}
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return (array_key_exists($key, $this->attributes)) ? $this->attributes[$key] : null;
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}
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/**
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* Magic Method for setting model attributes.
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*/
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public function __set($key, $value)
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{
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// If the key is a relationship, add it to the ignored attributes.
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if (method_exists($this, $key))
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{
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$this->ignore[$key] = $value;
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}
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else
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{
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$this->attributes[$key] = $value;
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$this->dirty[$key] = $value;
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}
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}
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/**
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* Magic Method for determining if a model attribute is set.
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*/
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public function __isset($key)
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{
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return (array_key_exists($key, $this->attributes) or array_key_exists($key, $this->ignore));
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}
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/**
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* Magic Method for unsetting model attributes.
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*/
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public function __unset($key)
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{
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unset($this->attributes[$key]);
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unset($this->ignore[$key]);
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unset($this->dirty[$key]);
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}
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/**
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* Magic Method for handling dynamic method calls.
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*/
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public function __call($method, $parameters)
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{
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if ($method == 'get')
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{
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return $this->_get();
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}
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if ($method == 'first')
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{
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return $this->_first();
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}
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if (in_array($method, array('count', 'sum', 'min', 'max', 'avg')))
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{
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return call_user_func_array(array($this->query, $method), $parameters);
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}
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// Pass the method to the query instance. This allows the chaining of methods
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// from the query builder, providing a nice, convenient API.
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call_user_func_array(array($this->query, $method), $parameters);
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return $this;
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}
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/**
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* Magic Method for handling dynamic static method calls.
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*/
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public static function __callStatic($method, $parameters)
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{
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$model = static::make(get_called_class());
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if ($method == 'get' or $method == 'all')
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{
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return $model->_get();
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}
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if ($method == 'first')
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{
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return $model->_first();
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}
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if (in_array($method, array('count', 'sum', 'min', 'max', 'avg')))
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{
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return call_user_func_array(array($model->query, $method), $parameters);
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}
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// Pass the method to the query instance. This allows the chaining of methods
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// from the query builder, providing a nice, convenient API.
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call_user_func_array(array($model->query, $method), $parameters);
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return $model;
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}
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} |