Drupal 8 Theming With Twig Pdf 40 [NEW]
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{{ title_prefix }} {{ title_suffix }} {{ content }}
Twig and Drupal are not smart enough to know if the title_prefix and title_suffix variables in the above example refer to strings in the database or arrays in the preprocess function. Because of this, you have to wrap these variables in an array to make sure Twig knows what they refer to. The correct approach is to put your variables in a $vars array like you do if you are writing a template file.
If you are writing an individual preprocess function for a specific field, then you must define the name of the function as the name of the field plus the machine name of the theme implementing it plus '_preprocess_' as a prefix. See for example field--fieldname--preprocess.html.twig:
// Field definition
$node = $vars['node'];
$title = $vars['field_name'];
if ($title!= 'field_myfield' AND $title!= 'field_myotherfield') { $node = node_load($node->nid); $title = $node->title;
}
In your Twig template file, you can now write:
The preprocess function can also be used as a filter. In that case, the name of the filter is THEMENAME_preprocess_# the machine name of the theme implementing it. For example, to create a custom field to allow users to enter a custom description of their comments, you can create a preprocess function with the filter name themename_preprocess_comment, that receives as $vars the field definition as an array. The following code shows an example of a preprocess function that adds a custom field to the comment entity type:
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One of the drawbacks to this approach was that we needed to recompile every time we made even a small change to the code. This slowed everything else we were doing down and because we couldn't always have someone waiting for the application to finish building. 827ec27edc