[ci skip] 3.1.8 release

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-######
-Models
-######
-
-Models are **optionally** available for those who want to use a more
-traditional MVC approach.
-
-.. contents:: Page Contents
-
-What is a Model?
-================
-
-Models are PHP classes that are designed to work with information in
-your database. For example, let's say you use CodeIgniter to manage a
-blog. You might have a model class that contains functions to insert,
-update, and retrieve your blog data. Here is an example of what such a
-model class might look like::
-
-	class Blog_model extends CI_Model {
-
-		public $title;
-		public $content;
-		public $date;
-
-		public function get_last_ten_entries()
-		{
-			$query = $this->db->get('entries', 10);
-			return $query->result();
-		}
-
-		public function insert_entry()
-		{
-			$this->title	= $_POST['title']; // please read the below note
-			$this->content	= $_POST['content'];
-			$this->date	= time();
-
-			$this->db->insert('entries', $this);
-		}
-
-		public function update_entry()
-		{
-			$this->title	= $_POST['title'];
-			$this->content	= $_POST['content'];
-			$this->date	= time();
-
-			$this->db->update('entries', $this, array('id' => $_POST['id']));
-		}
-
-	}
-
-.. note:: The methods in the above example use the :doc:`Query Builder
-	<../database/query_builder>` database methods.
-
-.. note:: For the sake of simplicity in this example we're using ``$_POST``
-	directly. This is generally bad practice, and a more common approach
-	would be to use the :doc:`Input Library <../libraries/input>`
-	``$this->input->post('title')``.
-
-Anatomy of a Model
-==================
-
-Model classes are stored in your **application/models/** directory.
-They can be nested within sub-directories if you want this type of
-organization.
-
-The basic prototype for a model class is this::
-
-	class Model_name extends CI_Model {
-
-	}
-
-Where **Model_name** is the name of your class. Class names **must** have
-the first letter capitalized with the rest of the name lowercase. Make
-sure your class extends the base Model class.
-
-The file name must match the class name. For example, if this is your class::
-
-	class User_model extends CI_Model {
-
-	}
-
-Your file will be this::
-
-	application/models/User_model.php
-
-Loading a Model
-===============
-
-Your models will typically be loaded and called from within your
-:doc:`controller <controllers>` methods. To load a model you will use
-the following method::
-
-	$this->load->model('model_name');
-
-If your model is located in a sub-directory, include the relative path
-from your models directory. For example, if you have a model located at
-*application/models/blog/Queries.php* you'll load it using::
-
-	$this->load->model('blog/queries');
-
-Once loaded, you will access your model methods using an object with the
-same name as your class::
-
-	$this->load->model('model_name');
-
-	$this->model_name->method();
-
-If you would like your model assigned to a different object name you can
-specify it via the second parameter of the loading method::
-
-	$this->load->model('model_name', 'foobar');
-
-	$this->foobar->method();
-
-Here is an example of a controller, that loads a model, then serves a
-view::
-
-	class Blog_controller extends CI_Controller {
-
-		public function blog()
-		{
-			$this->load->model('blog');
-
-			$data['query'] = $this->blog->get_last_ten_entries();
-
-			$this->load->view('blog', $data);
-		}
-	}
-	
-
-Auto-loading Models
-===================
-
-If you find that you need a particular model globally throughout your
-application, you can tell CodeIgniter to auto-load it during system
-initialization. This is done by opening the
-**application/config/autoload.php** file and adding the model to the
-autoload array.
-
-Connecting to your Database
-===========================
-
-When a model is loaded it does **NOT** connect automatically to your
-database. The following options for connecting are available to you:
-
--  You can connect using the standard database methods :doc:`described
-   here <../database/connecting>`, either from within your
-   Controller class or your Model class.
--  You can tell the model loading method to auto-connect by passing
-   TRUE (boolean) via the third parameter, and connectivity settings,
-   as defined in your database config file will be used::
-
-	$this->load->model('model_name', '', TRUE);
-
--  You can manually pass database connectivity settings via the third
-   parameter::
-
-	$config['hostname'] = 'localhost';
-	$config['username'] = 'myusername';
-	$config['password'] = 'mypassword';
-	$config['database'] = 'mydatabase';
-	$config['dbdriver'] = 'mysqli';
-	$config['dbprefix'] = '';
-	$config['pconnect'] = FALSE;
-	$config['db_debug'] = TRUE;
-
-	$this->load->model('model_name', '', $config);