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Commit 43f19687 authored by Taylor Otwell's avatar Taylor Otwell
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Improved comments in System\DB\Eloquent.

parent 5bfbfe42
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Showing with 49 additions and 75 deletions
system/db/eloquent.php
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<?php namespace System\DB;
use System\Str;
use System\Inflector;
abstract class Eloquent {
/**
......@@ -10,7 +13,9 @@ abstract class Eloquent {
public $exists = false;
/**
* The model attributes.
* The model's attributes.
*
* Typically, a model has an attribute for each column on the table.
*
* @var array
*/
......@@ -26,8 +31,8 @@ abstract class Eloquent {
/**
* The model's ignored attributes.
*
* Ignored attributes will not be saved to the database, and
* are primarily used to hold relationships.
* Ignored attributes will not be saved to the database, and are
* primarily used to hold relationships.
*
* @var array
*/
......@@ -55,7 +60,9 @@ abstract class Eloquent {
public $relating_key;
/**
* The table name of the model being resolved. Used during many-to-many eager loading.
* The table name of the model being resolved.
*
* This is used during many-to-many eager loading.
*
* @var string
*/
......@@ -76,15 +83,12 @@ abstract class Eloquent {
*/
public static function table($class)
{
// -----------------------------------------------------
// Check for a table name override.
// -----------------------------------------------------
if (property_exists($class, 'table'))
{
return $class::$table;
}
return \System\Str::lower(\System\Inflector::plural($class));
return Str::lower(Inflector::plural($class));
}
/**
......@@ -95,13 +99,12 @@ abstract class Eloquent {
*/
public static function make($class)
{
// -----------------------------------------------------
// Instantiate the Eloquent model.
// -----------------------------------------------------
$model = new $class;
// -----------------------------------------------------
// Set the fluent query builder on the model.
// Since this method is only used for instantiating
// models for querying purposes, we will go ahead and
// set the Query instance on the model.
// -----------------------------------------------------
$model->query = Query::table(static::table($class));
......@@ -116,14 +119,7 @@ abstract class Eloquent {
*/
public static function with()
{
// -----------------------------------------------------
// Create a new model instance.
// -----------------------------------------------------
$model = static::make(get_called_class());
// -----------------------------------------------------
// Set the relationships that should be eager loaded.
// -----------------------------------------------------
$model->includes = func_get_args();
return $model;
......@@ -196,12 +192,14 @@ abstract class Eloquent {
private function has_one_or_many($model, $foreign_key)
{
// -----------------------------------------------------
// Determine the foreign key for the relationship.
// The default foreign key for has one and has many
// relationships is the name of the model with an
// appended _id.
//
// The foreign key is typically the name of the related
// model with an appeneded _id.
// For example, the foreign key for a User model would
// be user_id. Photo would be photo_id, etc.
// -----------------------------------------------------
$this->relating_key = (is_null($foreign_key)) ? \System\Str::lower(get_class($this)).'_id' : $foreign_key;
$this->relating_key = (is_null($foreign_key)) ? Str::lower(get_class($this)).'_id' : $foreign_key;
return static::make($model)->where($this->relating_key, '=', $this->id);
}
......@@ -217,9 +215,6 @@ abstract class Eloquent {
{
$this->relating = __FUNCTION__;
// -----------------------------------------------------
// Determine the foreign key of the relationship.
// -----------------------------------------------------
if ( ! is_null($foreign_key))
{
$this->relating_key = $foreign_key;
......@@ -227,16 +222,14 @@ abstract class Eloquent {
else
{
// -----------------------------------------------------
// Get the calling function name.
// The default foreign key for belonging relationships
// is the name of the relationship method name with _id.
//
// So, if a model has a "manager" method returning a
// belongs_to relationship, the key would be manager_id.
// -----------------------------------------------------
list(, $caller) = debug_backtrace(false);
// -----------------------------------------------------
// Determine the foreign key for the relationship.
//
// The foreign key for belonging relationships is the
// name of the relationship method with an appended _id.
// -----------------------------------------------------
$this->relating_key = $caller['function'].'_id';
}
......@@ -254,9 +247,6 @@ abstract class Eloquent {
{
$this->relating = __FUNCTION__;
// -----------------------------------------------------
// Determine the intermediate table name.
// -----------------------------------------------------
if ( ! is_null($table))
{
$this->relating_table = $table;
......@@ -268,20 +258,25 @@ abstract class Eloquent {
// names of the models arranged alphabetically and
// concatenated with an underscore.
// -----------------------------------------------------
$models = array(\System\Inflector::plural($model), \System\Inflector::plural(get_class($this)));
$models = array(Inflector::plural($model), Inflector::plural(get_class($this)));
sort($models);
$this->relating_table = \System\Str::lower($models[0].'_'.$models[1]);
$this->relating_table = Str::lower($models[0].'_'.$models[1]);
}
// -----------------------------------------------------
// Determine the foreign key for the relationship.
// The default foreign key for many-to-many relations
// is the name of the model with an appended _id.
// appended _id.
//
// This is the same convention as has_one and has_many.
// -----------------------------------------------------
$this->relating_key = $this->relating_table.'.'.\System\Str::lower(get_class($this)).'_id';
$this->relating_key = $this->relating_table.'.'.Str::lower(get_class($this)).'_id';
return static::make($model)
->select(static::table($model).'.*')
->join($this->relating_table, static::table($model).'.id', '=', $this->relating_table.'.'.\System\Str::lower($model).'_id')
->join($this->relating_table, static::table($model).'.id', '=', $this->relating_table.'.'.Str::lower($model).'_id')
->where($this->relating_key, '=', $this->id);
}
......@@ -301,13 +296,11 @@ abstract class Eloquent {
return true;
}
// -----------------------------------------------------
// Get the class name of the Eloquent model.
// -----------------------------------------------------
$model = get_class($this);
// -----------------------------------------------------
// Get a fresh query instance for the model.
// Since the model was instantiated using "new", a query
// instance has not been set. We'll do it now.
// -----------------------------------------------------
$this->query = Query::table(static::table($model));
......@@ -339,9 +332,6 @@ abstract class Eloquent {
$result = $this->exists = is_numeric($this->id);
}
// -----------------------------------------------------
// The dirty attributes can be cleared after each save.
// -----------------------------------------------------
$this->dirty = array();
return $result;
......@@ -370,7 +360,8 @@ abstract class Eloquent {
public function __get($key)
{
// -----------------------------------------------------
// Check the ignored attributes first.
// Check the ignored attributes first. These attributes
// hold all of the loaded relationships.
// -----------------------------------------------------
if (array_key_exists($key, $this->ignore))
{
......@@ -378,13 +369,10 @@ abstract class Eloquent {
}
// -----------------------------------------------------
// Is the attribute actually a relationship?
// Is the attribute actually a relationship method?
// -----------------------------------------------------
if (method_exists($this, $key))
{
// -----------------------------------------------------
// Get the query / model for the relationship.
// -----------------------------------------------------
$model = $this->$key();
return ($this->relating == 'has_one' or $this->relating == 'belongs_to')
......@@ -402,14 +390,12 @@ abstract class Eloquent {
{
// -----------------------------------------------------
// If the key is a relationship, add it to the ignored.
// Otherwise, we can simply add it as an attribute.
// -----------------------------------------------------
if (method_exists($this, $key))
{
$this->ignore[$key] = $value;
}
// -----------------------------------------------------
// Set the attribute and add it to the dirty array.
// -----------------------------------------------------
else
{
$this->attributes[$key] = $value;
......@@ -440,25 +426,18 @@ abstract class Eloquent {
*/
public function __call($method, $parameters)
{
// -----------------------------------------------------
// Retrieve an array of models.
// -----------------------------------------------------
if ($method == 'get')
{
return $this->_get();
}
// -----------------------------------------------------
// Retrieve the first model result.
// -----------------------------------------------------
if ($method == 'first')
{
return $this->_first();
}
// -----------------------------------------------------
// If the method is an aggregate function, just return
// the aggregate value from the query.
// Pass aggregate methods to the query instance.
// -----------------------------------------------------
if (in_array($method, array('count', 'sum', 'min', 'max', 'avg')))
{
......@@ -466,7 +445,8 @@ abstract class Eloquent {
}
// -----------------------------------------------------
// Pass the method call to the query instance.
// Pass the method to the query instance. This allows
// the chaining of methods from the query builder.
// -----------------------------------------------------
call_user_func_array(array($this->query, $method), $parameters);
......@@ -480,25 +460,18 @@ abstract class Eloquent {
{
$model = static::make(get_called_class());
// -----------------------------------------------------
// Retrieve the entire table of models.
// -----------------------------------------------------
if ($method == 'get')
{
return $model->_get();
}
// -----------------------------------------------------
// Retrieve the first model result.
// -----------------------------------------------------
if ($method == 'first')
{
return $model->_first();
}
// -----------------------------------------------------
// If the method is an aggregate function, just return
// the aggregate value from the query.
// Pass aggregate methods to the query instance.
// -----------------------------------------------------
if (in_array($method, array('count', 'sum', 'min', 'max', 'avg')))
{
......@@ -506,7 +479,8 @@ abstract class Eloquent {
}
// -----------------------------------------------------
// Pass the method call to the query instance.
// Pass the method to the query instance. This allows
// the chaining of methods from the query builder.
// -----------------------------------------------------
call_user_func_array(array($model->query, $method), $parameters);
......
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