mvc-x

MVC-X is a fast multi-app, multi-database MVC with low-coupled extension support and small footprint. It has also SEO-friendly URLs and easy data access.

I. Concept

MVC-X provides a MVC (model-view-controller) architecture well-isolated from X (extensions) and core code (framework). This allows you to achieve powerful webapp scenarios, while keeping the app codebase clean. Two main directories come with the code,

• .mvcx/ - under-the-hood folder, no touch here
• apps/ - here you create and implement your applications

Each application has the following directory structure,

• /model/ - here you create and implement your models, i.e. blog.php
• /view/ - here you create and implement your views, i.e. blog/view.tpl, check the cool autoPersist feature below
• /controller/ - here you create and implement your controllers, i.e. blog.php
• /x/ - extensions, here you create and put all the extensions (themes, language, vendors, etc). The extensions can both autoload and load on demand. They can also be separate logic, overrides, pages, everything.

As you noticed, the naming convention is singular lowercased. The name blog in the points above is just for an example, you will notice it in other examples too.

II. Configuration

The configuration of each app is in the config.php file in the root of the app, and it looks like,

array(
	'url'=>array('mysite.com'),
	'dir'=>'mysiteapp',
	'db' => array(
		'default' => array(
			'type'=>'mysql',
			'host'=>'localhost',
			'name'=>'',
			'username'=>'',
			'password'=>'',
			'table_prefix'=>''
		)
	),
	'timezone' => 'Europe/Sofia',
	'template'=> false,
	'smart_elements'=> true,
	'debug_mode'=> 1
);

• url - here you should add your site public url without protocol and subdomain, e.g. mysite.com
• dir - the name of the app directory on your server e.g. mysite
• db - the database configuration of the app
• timezone - The timezone for the app. Should be one of the specified here By default the timezone is set to UTC
• template - Accepts boolean or string. Specifies the name of the template you want to use. The template name should be a folder in /view/template/. If set to false, it will not use a template.
• smart_elements - Accepts boolean. If true, the response will parse all smart elements. A smart element is e.g. [widget:breadcrumb]
• debug_mode - If you enable debug mode, you will see debug information at the bottom of your page. To put this app in debug mode you need to set it to 1, otherwise leave it 0.

As you can guess multiple db configurations are supported. When MVC-X boots it first looks for a configuration named default, if such is not found it will use the first one available. Later you can switch to a different configuration by simply calling $this->app->setDb('{config_name}');

III. Retrieving your data

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The following ways of retrieving data are available,

Auto persistence

When enabled, this automatically retrieves your data and passes it to the view. You can enable it in your controller action in the following way.

$this->autoPersist = true;

Supported views are index, view, edit, add. When used in the latter two views, this will also automatically store the data if you perform a post request.

Fluent query

Using MVC-X fluent queries you can retrieve your specific desired data. It follows the model of $this->modelName->getColumnsByCriteria(). Example usage:

$this->blog->getAll(); Returns all the blog posts i.e. all entries from the 'blog' table

$this->blog->getAllById(5); Returns the blog post with id equal to 5

$this->blog->getAllByContent('%hurricane%'); Returns a list of blog posts that have the word 'hurricane' in its content

$this->blog->getAllByContentAndCreated('%hurricane%','> 2014-01-01'); Returns a list of blog posts that have the word 'hurricane' in its content, created after 2014-01-01

$this->blog->getTitleByUser(12); Returns a list of blog titles published by user with id = 12

$this->blog->getTitleAndContentByUserAndStatus(12, true); Returns a list of blog titles and content, from blog posts with active status, published by user with id = 12

$this->blog->getTitleAndContentByUserAndStatusGroupbyAuthor(12, true); Returns a list of blog titles and content, from blog posts with active status, published by user with id = 12 and grouped by author column

$this->blog->getTitleAndContentByUserAndStatusGroupbyAuthorSortbyCreated(12, true); Returns a list of blog titles and content, from blog posts with active status, published by user with id = 12 and grouped by author column and sorted (ordered) by created date column. Sortby and Orderby are aliases and can be used interchangeably.

$this->blog->getTitleAndContentByUserAndStatusGroupbyAuthorSortbyCreatedDesc(12, true); The same as the previous example, as it sorts the results in descending direction.

$this->blog->getTitleAndContentByUserAndStatusGroupbyAuthorSortbyCreatedAsc(12, true); The same as the previous example, as it sorts the results in ascending direction.

Database query

A normal query can be accomplished using your DB engine syntax. In this example, we are selecing all blog posts using MySQL. The returned result will be an array of posts.

$posts = $this->blog->query('SELECT * FROM blog');

Note! The example above is valid if you are querying the database from the controller. I guess it is logical but, if you want to execute a query in the model you will do just $posts = $this->query('SELECT * FROM blog');

IV. Saving your data

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The following ways of saving data are available,

$this->modelName->save($data);

This will save an array of data having its keys matching the table columns. It can be single entry data or array of entries. If id is present, it will update the data, if not, it will insert it.

$this->modelName->saveEntry($data);

This saves an array of data, exactly the same way as save(), with the only difference it can be used for single entries only.

$this->modelName->lastId();

Returns the id of the last inserted database table row.

Note! By default models are connected to the model's class name in lowercase. However, you can manually specify the model's table by adding a $table property to the class definition like this

class Blog extends Model {
	public $table = 'blog';
}

That way you will make sure the model is always working on the table you expect it to.

V. Database table structure

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In order to auto-bind database table to model, you need to have your table under the same name as your controller, e.g. blog. While the only required column is id, you can make a good use of a few natively populated columns if you have them added. Please find the names of the columns which if you have added you will get them autofilled by MVC-X on each save operation via the *Model::save()* or *Model::saveEntry()* methods,

• id - this is the autoincrement primary key of the table
• ua - the useragent of the user performing the save/update request with its browser information
• ip - the ip of the user performign the save/update request, catches IPs behind proxy too
• created - date of entry created
• modified - date of entry modified

VI. Using the x/ directory

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The x/ directory is supposed to hold your app extensions, third party libraries and custom classes which do not fit anywhere else. Extensions may provide their MVC structure as if they are mini mvc-x applications. Their controllers must extend the XController class. If you want to load a custom class or third party library from the current app controller, you can include the needed files by just calling $this->load->x('lib_filename');. This will look for a file named lib_filename.php in the x/ directory and include it if it exists. You can also load files found in sub-directories like this $this->load->x('third_party_lib/a_dir/filename'); and this will look for the file filename.php inside the x/third_party_lib/a_dir/ directory.

In order for an extension to be considered an extension it should have an xconfig.php file in its base directory. In that file you can have a variable named $xconfig wchich can be any valid PHP type and its value will be set to the extension's model in the config property. So in the model you are able to access the extension config through $this->config. If your extension needs some custom install logic (say you need to create some DB tables), you can do this in an install() method of the model. This method will be called only the first time the model is loaded.

VII. Smart elements

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Smart elements are a way to neatly include piece of code in your template. The idea is that you split your view parts into elements which you reuse in your pages. The elements can be widgets or blocks. They are standard .tpl files located in the view/element/{block, widget}/ directory. If you want to use an element in your view, just add it like this:

<html_code_here>
[block:nav]
</html_code_here>

This will replace the string [block:nav] with the contents of the view/element/block/nav.tpl view. You can also pass variables to the views like this: [block:nav title=My title] then you can use the $title variable in the nav.tpl view. Smart elements can optionally have a controller which will be executed just before they are rendered. This can be useful if you want to populate the navigation with some links defined in a database. The controller needs to be placed in the controller/element/{block,widget}/ directory. So the controller file for the [block:nav] element will be controller/element/block/nav.php. The class should be named BlockNavController and the method you need to define is beforeRender(). This is a standard controller, so you can use the $this->set() method to pass variables to the view.

Threre are 2 special smart elements: [widget:js] and [widget:css] which are used to import CSS and JS resources. They are special because they are rendered last and they accept the parameter position. This allows you to use them multiple times and each one will have its own set of scripts/styles. For example you can place the JS widget in the header like this [widget:js position=header] and then in the footer like this [widget:js position=footer]. Then in any of your controllers (these include the elements' controllers), you can call $this->addScript('path_to_script', 'header'); and this will add a script which will be displayed in the [widget:js position=header] widget. You can use any custom defined position for example [widget:css position=the middle of the page]. And yes, you can use spaces in the smart element's parameters without needing to quote the value. Actualy if you put quotes around it, they will be part of the value of the parameter.

If you want to disable the smart elements parsing for a particular widget or block just write $this->smart_elements = false; in its controller beforeRender() method.

VIII. Debugging

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The following techniques are available for debugging.

pr(mixed $var);

This will output a variable, array or object of your choice in well-formatted manner.

debug_mode=>true

This is a setting in the config.php of your app, which when enabled will produce useful debug information at the bottom of every page.

You can also use $this->log->debug('my_var', $var); to add to the debug info in the bottom of the pages. The debug() method supports several formats:

• $this->log->debug($key, $value)
• $this->log->debug($arr) - where $arr is an associative array. If this form is used each item will be printed as a separate entry in the debug log
• $this->log->debug(compact($value)) - this is actually very similar to the first example, but the $key will be automatically set to the variable's name