Google Choice: Phalcon - Scaffolding Application

Wednesday, March 8, 2017

Phalcon - Scaffolding Application

Scaffolding usually refers to a type of code generation where we point it to a web application database, which results in creating a basic CRUD (Create, Read, Update, Delete) application.
Before designing a CRUD application, it is important to design database tables as per the need of the application.

Step 1 − Create a scaffolding application which will include all crud operations.

Command: phalcon scaffold <table-name>

The scaffold generator of Phalcon once executed will create files and folders which are described in the following table.

Step 2 − Create an index page (Combination of phtml and volt).
Code to be included in index.phtml in users folder.

<?php use Phalcon\Tag as Tag ?> 
<!DOCTYPE html> 
<html> 
   <head> 
      <meta charset = "utf-8"> 
      <title>Blog Tutorial</title> 
      <link rel = "stylesheet" type = "text/css" 
         href = "http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.1/css/bootstrapcombined.min.css"/> 
      <meta name = "viewport" content = "width = device-width, initial-scale = 1.0"> 
   </head> 
   
   <body>  
      <div class = "navbar navbar-fixed-top"> 
         <div class = "navbar-inner"> 
            <div class = "container"> 
               <a class = "btn btn-navbar" data-toggle = "collapse" datatarget = ".nav-collapse"> 
                  <span class = "icon-bar"></span> 
                  <span class = "icon-bar"></span> 
                  <span class = "icon-bar"></span> 
               </a> 
               <a class = "brand" href = "#">Blog Collection</a> 
               
               <div class = "nav-collapse"> 
                  <ul class = "nav pull-left"> 
                     <li> 
                        <?php echo Phalcon\Tag::linkTo('index', 'Home Page') ?> 
                     </li> 
                     
                     <?php if ($this->session->has('auth')) { ?> 
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('posts/index', '+Posts') ?> 
                        </li> 
                     
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('categories/index', '+Categories') ?> 
                        </li> 
                     
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('users/logout', 'Log out') ?> 
                        </li> 
                     <?php } else { ?> 
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('users/index', 'Log in') ?> 
                        </li> 
                     <?php } ?> 
                  </ul> 
               </div> 
               
            </div> 
         </div>  
      </div>
      <?php echo $this->getContent() ?>  
      
      <script src = "http://netdna.bootstrapcdn.com/twitterbootstrap/2.2.1/js/bootstrap.min.js"></script> 
   </body> 
</html>

Default file index.volt will include the following code.

<?php echo $this->getContent() ?>  

<div align = "center">  
   <h1>Welcome!</h1>  
   <p>Welcome to the blog collection of Phalcon</p>  
</div>

Successful execution of the above code produces the following output.
Above Code Output

Step 3 − Change with the respective models.

Users.php

<?php  

class Users extends \Phalcon\Mvc\Model {  
   /** 
      * @var integer 
      * 
   */ 
   
   public $id;  
   /** 
      * @var string 
      * 
   */ 
    
   public $login;  
   /** 
      * @var string 
      * 
   */ 
   
   public $password; 
   /** 
      * Initializer method for model. 
   */ 
    
   public function initialize() { 
      $this->hasMany("id", "Posts", "users_id"); 
   } 
}

The function named ‘initialize’ helps in implementing relationship between id and users_id in Posts table, which means that each unique user has many posts associated in the table.

Posts.php

<?php  

class Posts extends \Phalcon\Mvc\Model {  
   /** 
      * @var integer 
      * 
   */ 
   
   public $id;  
   /** 
      * @var string 
      * 
   */ 
    
   public $title;  
   /** 
      * @var string 
      * 
   */ 
   
   public $slug;  
   /** 
      * @var string 
      * 
   */ 
   
   public $content;  
   /** 
      * @var string 
      * 
   */ 
   
   public $created; 
   /** 
      * @var integer 
      * 
   */ 
   
   public $users_id;  
   /** 
      * @var integer 
      * 
   */ 
    
   public $categories_id;   
   /** 
      * Initializer method for model. 
      */ 
   
   public function initialize() { 
      $this->belongsTo("users_id", "Users", "id"); 
      $this->belongsTo("categories_id", "Categories", "id"); 
   } 
}

The function ‘initialize’ includes relationship constraint mentioning the foreign key and primary key relationship with the table.
users_id refers to id in “Users” table.
categories_id refers to id in “Categories” table.

Categories.php

<?php  

class Categories extends \Phalcon\Mvc\Model {  
   /** 
      * @var integer 
      * 
   */ 

   public $id;  
   /** 
      * @var string 
      * 
   */ 

   public $name;  
   /** 
      * @var string 
      * 
   */ 

   public $slug;   
   /** 
      * Initializer method for model. 
   */ 
   
   public function initialize() { 
      $this->hasMany("id", "Posts", "categories_id"); 
   } 
}

Similar to Users model, the ‘initialize’ function specifies that it includes many categories_id for the given post.
Designing the Login Page

Creating Views

Following is the complete structure of Blog-tutorial-master project.

The associated view for displaying the home page after the user successfully logs in is “index.phtml”.

<?php use Phalcon\Tag as Tag ?> 
<!DOCTYPE html> 
<html> 
   <head> 
      <meta charset = "utf-8"> 
      <title>Blog Tutorial</title> 
      <link rel = "stylesheet" type = "text/css" href = "http://netdna.bootstrapcdn.com/twitter-bootstrap/2.2.1/css/bootstrapcombined.min.css"/> 
      <meta name = "viewport" content = "width = device-width, initial-scale = 1.0"> 
   </head> 

   <body>  
      <div class = "navbar navbar-fixed-top"> 
         <div class = "navbar-inner"> 
            <div class = "container"> 
               <a class = "btn btn-navbar" data-toggle = "collapse" datatarget = ".nav-collapse"> 
                  <span class = "icon-bar"></span> 
                  <span class = "icon-bar"></span> 
                  <span class = "icon-bar"></span> 
               </a> 
               <a class = "brand" href = "#">Blog Collection</a> 
               
               <div class = "nav-collapse"> 
                  <ul class = "nav pull-left"> 
                     <li> 
                        <?php echo Phalcon\Tag::linkTo('index', 'Home Page') ?> 
                     </li> 
                     <?php if ($this->session->has('auth')) { ?> 
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('posts/index', '+Posts') ?> 
                        </li> 
                        
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('categories/index', '+Categories') ?> 
                        </li> 
                        
                        <li> 
                           <?php echo Phalcon\Tag::linkTo('users/logout', 'Log out') ?> 
                        </li> 
                     <?php } else { ?> 
                        <li>
                           <?php echo Phalcon\Tag::linkTo('users/index', 'Log in') ?> 
                        </li> 
                     <?php } ?> 
                  </ul> 
               </div>
               
            </div> 
         </div>
      </div>            
      <?php echo $this->getContent() ?>  
      <script src = "http://netdna.bootstrapcdn.com/twitterbootstrap/2.2.1/js/bootstrap.min.js"></script> 
   </body> 
</html>

Category Management

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