The biggest advantage of this in my opinion is including templates from outside a Drupal site into a Drupal site or from one entity type to another. You could also insert an entire parent into a child and replace variables but not content. Include brings a child template into a parent by inserting the entire child template into the parent a specific point. Think of it this way-extends is like bringing a parent template into a child template and changing some of the content of the parent in the child. Include also differs from extends in that template you are including is included directly where the call is placed in the child. Include also inherits content of a file, but also allows variables from the current template to replace those from the parent template. Use include to insert one template into another You can use Twig debug to find template names and theme_suggestion hooks to create new template naming structures. (third level for fields with the machine name long text only on the Page content type).(second level for all fields with the machine name of long_text_).(global top level for all field entities).Entity hierarchy levels are always separated by two hyphens and words within each level by one hyphen. There are many different naming combinations for Drupal Twig templates, depending on the entity you are theming and how specific you are in naming the template. Drupal will use the for every field except fields with the machine name of field_long_text when it will use the template you created with the more specific name. In that case, it makes no difference what directory they are in (as long as they are somewhere in the theme/templates directory). To take it one step further, you can have a and. This is often a handy trick for customizing templates that are defined by default themes like Classy since its not the best idea to rewrite default theme templates in case you need to reference or revert to them later. If you have a copy of that template in a theme/templates/zzz-custom directory in your theme and customize it there, Drupal will choose to use the one in /zzz-custom instead of because it is at the very bottom of the hierarchy-even though both it and the original are in your /theme/templates directory. For example, if you have a template called in your theme/templates directory, Drupal will use that in place of the core template because /theme/templates is lower in the hierarchy than /core. When deciding which Twig template to use, Drupal looks at both name specificity and directory hierarchy. This is most easily done in Drupal 8 by copying the Twig template you want to change and either naming it more specifically or adding it to a custom folder at the bottom of your theme structure. This is equivalent to the drush vset theme_debug 1 command in D7.Īs with Drupal 7, any module or core template changes you make should be defined in a custom template. You should now be able to use your browser’s inspector to tool to see all the possible template suggestions in the code as well as which templates are being used. Change the debug variable to true, auto_reload to true, and the cache variable to false. In that services.yml file (around line 39) is a parameter called nfig. gitignore it or assume-unchanged, since you don’t want your debugging settings to be pushed to anywhere except your local machine). Copy this file and rename it to services.yml ( and make sure you either. Every D8 site comes with a file in the sites/default folder. Twig debugging to get template suggestionsĮnabling debugging is very easy in Drupal 8. Devel cache clear will get your images displaying properly. Drupal 8 can be difficult when it comes to displaying image styles on a local environment-especially with responsive images. Devel also has a nice cache clear function that will clear both the site cache and the image cache.
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