Question
How to create a View Plugin Without using Database field , to use with an existence entity (Node, Taxonomy, user ...) ?
Step 1. Create a custom module and add the HOOK hook_views_data_alter(&$data). Here module : mymodule
Step 2. Alter views data, Example
function mymodule_views_data_alter(&$data) {
//Add to Node views
$data['node']['random_value'] = array(
'field' => array(
'id' => 'random_value',
'title' => t('Random value'),
'help' => t('Example of random value plugin.'),
),
);
//Add to Taxonomy views
$data['taxonomy_term_data']['random_value'] = array(
'field' => array(
'id' => 'random_value',
'title' => t('Random value'),
'help' => t('Example of random value plugin.'),
),
);
//Add to Users views
$data['users']['random_value'] = array(
'field' => array(
'id' => 'random_value',
'title' => t('Random value'),
'help' => t('Example of random value plugin.'),
),
);
}
Step 3. Create view plugin on your custom mudule. (Here the minimum necessary to create a plugin)
Examlple : mymodule/src/Plugin/views/field/RandomValue.php
Plugin with minimim settings.
<?php
namespace Drupal\mymodule\Plugin\views\field;
use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\ResultRow;
use Drupal\Core\Form\FormStateInterface;
/**
* Default implementation of the base field plugin,
*
* @ingroup views_field_handlers
*
* @ViewsField("random_value")
*/
class RandomValue extends FieldPluginBase {
/**
* This is the most important part of this plugin.
* Empty query methode, Allow to create field without database table field.
*/
public function query() {
//Must leave blank
}
/**
* {@inheritdoc}
*/
public function render(ResultRow $values) {
//Retun your custom vaule, Here, a random value.
return "Random value is : " . rand(0, 1000);
}
}
Complete plugin with few other settings
<?php
namespace Drupal\mymodule\Plugin\views\field;
use Drupal\views\Plugin\views\field\FieldPluginBase;
use Drupal\views\ResultRow;
use Drupal\Core\Form\FormStateInterface;
/**
* Default implementation of the base field plugin,
*
* @ingroup views_field_handlers
*
* @ViewsField("random_value")
*/
class RandomValue extends FieldPluginBase {
/**
* This is the most important part of this plugin.
* Empty query methode, Allow to create field without database table field.
*/
public function query() {
//Must leave blank
}
/**
* {@inheritdoc}
*/
protected function defineOptions() {
$options = parent::defineOptions();
$options['add_text'] = array('default' => 0);
return $options;
}
/**
* {@inheritdoc}
*/
public function buildOptionsForm(&$form, FormStateInterface $form_state) {
$form['add_text'] = array(
'#title' => t('Add a text'),
'#type' => 'checkbox',
'#default_value' => $this->options['add_text'],
);
parent::buildOptionsForm($form, $form_state);
}
/**
* {@inheritdoc}
*/
public function submitOptionsForm(&$form, FormStateInterface $form_state) {
$this->options['add_text'] = $form_state->getValue('add_text');
parent::buildOptionsForm($form, $form_state);
}
/**
* {@inheritdoc}
*/
public function adminSummary() {
return $this->options['add_text'] ? "With text" : "no text";
}
/**
* {@inheritdoc}
*/
public function render(ResultRow $values) {
return ($this->options['add_text'] ? "Random value is : " : "") . rand(0, 1000);
}
}
Finally
Now you can add this field to your Node, Taxonomy and Users Views.
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