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Nested Sets

9 Jahre 8 Monate her #666 von Yonder Media
Nested Sets wurde erstellt von Yonder Media
Having used Component Creator quite extensively, one of the things I find myself having to make over and over again, are nested set models.  For instance, Nested Sets are used in Joomla's native Category component, allowing n-tiered nesting of categories associated with other categories.

In the Table class, this requires changing it from JTable to JTableNested, and including code in the prepareTable function of the model class (an example is shown below:)
protected function prepareTable($table)
{
       jimport('joomla.filter.output');
       $db = JFactory::getDbo();

       // Specify where to insert the new node.
       $parent = @$table->parent_id;
       if (!empty($parent))
       {
           $table->setLocation($parent, 'last-child');
       }
       else
       {
           $rootId = $table->getRootId();
           if ($rootId === false)
           {

               $db = JFactory::getDbo();
               $sql = 'INSERT INTO #__yomo_ussd_article_category'
                   . ' SET parent_id = 0'
                   . ', lft = 0'
                   . ', rgt = 1'
                   . ', level = 0'
                   . ', title = '.$db->quote('root')
                   . ', alias = '.$db->quote('root')
                   . ', access = 1'
                   . ', path = '.$db->quote('')
               ;
               $db->setQuery($sql);
               $db->query();

               $parent = $db->insertid();
               $table->setLocation($parent, 'last-child');
           }
           else
           {
               $table->setLocation($rootId, 'last-child');
           }

       }

       # Check that the node data is valid.
       $table->check();

       # Store the node in the database table.
       $table->store();
}

Additionally, then, this requires changes to the View classes and markup output, to correctly show entries as being nested within each other.  For this, I've borrowed code from Joomla's Category Component to achieve this.

Whilst I can get this all to work, it would be a really cool feature to have this built-in to Component Creator!

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9 Jahre 8 Monate her #667 von RIP Graphics
RIP Graphics antwortete auf Nested Sets
+1

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9 Jahre 7 Monate her #700 von Pete
Pete antwortete auf Nested Sets
+1

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9 Jahre 6 Monate her #771 von Søren Beck Jensen
Søren Beck Jensen antwortete auf Nested Sets
Please note that this relates only to nested sets of custom tables. You can always use the Joomla Category field and create as many nested categories you would like.

Thanks to Brian Teeman for pointing this out.

Søren Beck Jensen
Founder, Component-Creator.com

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9 Jahre 4 Monate her #876 von Ilya Protasov
Ilya Protasov antwortete auf Nested Sets
+1

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9 Jahre 4 Monate her #883 von Jesper
Jesper antwortete auf Nested Sets
+1 as i sit and could use this right now for something i have to build

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