working on day6

lib/Model/DVD.php

@@ -6,9 +6,32 @@ function init(){
 
         $this->addField('movie_id')->refModel('Model_Movie');
         $this->addField('code');
+
+        $this->addfield('is_rented')
+            ->type('boolean')
+            ->calculated(true);
     }
     function toStringSQL($source_field, $dest_fieldname){
         return 'concat("DVD#",id,": ",(select name 
                     from movie m,dvd d where m.id=d.movie_id and d.id='.$source_field.')) as '.$dest_fieldname;
     }
+    function calculate_is_rented(){
+        $select=$this->add('Model_Rental')
+            ->dsql()
+            ->field('id')
+            ->where('rental.dvd_id=dvd.id')
+            ->where('is_returned!=','Y')
+            ->select()
+            ;
+
+        return "if(($select) is null,'N','Y')";
+    }
+    function rent($customer_id){
+        $m=$this->add('Model_Rental')
+            ->set('dvd_id',$this->get('id'))
+            ->set('customer_id',$customer_id)
+            ;
+        $m->update();
+        return $m;
+    }
 }

lib/Model/Movie.php

@@ -7,5 +7,11 @@ function init(){
         $this->addField('name');
         $this->addField('year')->type('int');
         $this->addField('imdb')->caption('IMDB Link');
+
+        $this->addField('available')->calculated(true);
+    }
+    function calculate_available(){
+        return $this->add('Model_DVD_InStore')
+            ->dsql_count()->select();
     }
 }

page/video.php

@@ -4,6 +4,15 @@ function init(){
         parent::init();
         $this->api->auth->check();
 
-        $this->add('MVCGrid')->setModel('Movie');
+        $grid=$this->add('MVCGrid');
+        $grid->setModel('Movie_Available');
+        $grid->addColumn('button','rent');
+        if($_GET['rent']){
+            $rental = $grid->getModel()->loadData($_GET['rent'])->rent($this->api->auth->get('id'));
+
+            $grid->js(null,
+                    $this->js()->reload())->univ()->successMessage('Rented successfully #'.$rental->get('id'));
+        }
+
     }
 }