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Foreign Key select from existing components

10 år 4 måneder dager siden #265 av Francisco
Hi,

When i create a foreign key field, it would be great if the dropdown would allow me to select also from my existing component's (the one's i've created).

I can of course download the component, modify the form XML file to select a different table but i have to do it every time i update the component.

Thanks!
Følgende bruker(e) sa Takk: Walt Sorensen

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10 år 3 måneder dager siden #325 av VeCrea
I agree.
To make it easy to maintain, i would break down dev into separate components and then "link" components together.
Example : three components :
1) Staff members
2) Reporting
3) Sales
where 2) and 3) would use data from 1)

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10 år 3 måneder dager siden - 10 år 3 måneder dager siden #332 av Dan Davis
Besvart av Dan Davis i emne Foreign Key select from existing components
Problem with doing that is you cannot know if the other components will always be installed. I solve this by adding a custom field to my component and giving it the ability to check if a table is actually in the database.

The PHP code goes in "/models/fields/whatever_your_field_name_is.php" in the admin, site or both parts of the component. Here is an example field definition file with comments:
<?php
/**
* @author        DDCS, Limited
* @copyright    2014; All Rights Reserved
* @license        Commercial International License; See LICENSE.txt
*/

defined("_JEXEC") or die("Restricted access");

defined('JPATH_BASE') or die();
JFormHelper::loadFieldClass('list');

/**
* Describe this field
*/
class JFormFieldTherapistList extends JFormFieldList
{
    /**
    * The form field type.
    *
    * @var    string
    * @since  11.1
    */
    protected $type = 'therapistlist';

    /**
    * Method to get the field options.
    *
    * @return  array  The field option objects.
    *
    * @since   11.1
    */
    protected function getOptions()
    {

        // The HTML option elements - do not edit this one
        $options = array();

// Get a list of all tables currently in the database. 
// getTableList returns an array, which is helpful
        $tables      = JFactory::getDbo()->getTableList();
        
// Set the name of the table you are looking for. Because you have no idea what the prefix will be,
// just use the tablename part of the name string. The Joomla #__ variable does not seem to work here
// for some reason I do not care to investigate.
        $gettable    = 'therapists';
        
// find out if your table actually exists in the database. I do this by using the substring count function
// and imploding the array of table names into a string using implode()
        $table_check = substr_count ( implode( $tables ), $gettable );
        
// Now that you know if the table is installed, you can get the option data from the table. 
        if($table_check != 0 )
        {

            $db    = JFactory::getDbo();
            $query = $db->getQuery(true);
            $query->select('id, name');
            $query->from('#__therapists');
            $query->where('`state` = 1');
            $db->setQuery($query);
            $alltherapists = $db->loadObjectList();

// Create a new option object based on the < option /> element.

// Put in a default message value for the top of the options list.
            $options[] = JHtml::_('select.option', '', 'Select a Therapist');

// Now loop through the Query results and add an option for each value
            foreach($alltherapists as $therapist){
                // Create options for the < option /> element.
                $options[] = JHtml::_('select.option', $therapist->id, $therapist->name);

            }
        }
// If the table does not exist you can simply put in a "Sorry, Charlie" type of message.
        else
        {
            // Create a new option object based on the < option /> element.
            $options[] = JHtml::_('select.option', '', 'Therapist List Not Available');

        }

// Merge any additional options in the XML definition.
        $options = array_merge(parent::getOptions(), $options);

// Return the options you have found.
        return $options;
    }


    public function getInput()
    {

        // The HTML option elements - do not edit this one
        $options = array();

        $options = $this->getOptions();

        return JHTML::_('select.genericlist', $options, $name    = $this->name, $attribs = null, $key      = 'value', $text     = 'text',  $selected = $this->value);
    }

}

You can then edit "/models/forms/whatever_your_form_name_is.php" and change the XML markup to match the field you created. This code goes with the example field definition:
<field name="therapist" type="therapistList" size="11" class="inputbox"
        
            label="COM_PATIENTS_FORM_LBL_DOCUMENT_THERAPIST"
            description="COM_PATIENTS_FORM_DESC_DOCUMENT_THERAPIST" 
        /> 
All in all, it is fairly easy.

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Last edit: 10 år 3 måneder dager siden by Dan Davis. Grunn: clarification of objectives
Følgende bruker(e) sa Takk: VeCrea

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10 år 3 måneder dager siden #342 av VeCrea
Thank you for your answer.
I get you cannot know if component is installed or not : you're right, but the whole point of creating custom components is to be able to make choices like this. I break down one big app in multiple apps because i want to expand possibilities without touching the base apps.
I still think it would be a real good addition to component-creator, one that would really be a game-changer.
Btw, could not get your solution to work yet. List is not populated. Think I will figure it out, but if you see anything missing...

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10 år 3 måneder dager siden #343 av VeCrea
Got it to work, using your idea but based on the code of the "foreign key" field.
Thanks again.

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10 år 3 måneder dager siden #354 av Pedro
In place of existing components because the system don't have the tables in their side, a manual table relation would be enough, write table, id and name fields, that way you can relate with anything in the same Joomla database, would be very welcome :)

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