Let’s actually make this module do something. But hey, it shows up! And you wrote a module! So congrats, that’s pretty cool. I mean, this module does absolutely nothing. Just with this one file, you should see your module: Go ahead and load up your Drupal site and visit the “Extend” page (module overview page) at /admin/modules. Package: the group the module will be placed in: appears on the module overview pageĬore_version_requirement: restricts the module to Drupal 9 only Name: the human readable name of the module: appears on the module overview pageĭescription: the human readable description of the module: appears on the module overview page Just make sure that you consistently replace the key I’m using (madison_example_one) with your own key if you so desire. Obviously, you’re welcome to rename this whatever you want. Inside that file, you’ll want to populate the following YML: name: Madison Blog Example One You’ll want to:Ĭreate a new folder in docroot/modules/custom called madison_example_oneĬreate a file in that folder called madison_example_ It will make life infinitely simpler.įirst, let’s create a new module called madison_example_one. Ok, now that we have some of the background information out of the way, let’s build a module! I strongly recommend that you setup for local development using Drupal VM / Lando / DDev / Docksal or your other favorite virtual machine. I spoke at Drupal GovCon a couple of years ago on the differences between Drupal 7 and Drupal 8 module development if you want a bit more material on the topic! In Drupal 8, we introduce dependency management via Composer In Drupal 8, we completely remove the PHP Template system and replace with Twig hooks) so an understanding of Object Oriented PHP is critical In Drupal 8 a significant amount of the API has been ported into classes / methods (vs. Suffice to say, there are pretty significant differences. There are more significant differences between Drupal 7 and 8/9 than I have time to cover in this blog post. I recommend using a tool like Upgrade Status to scan your custom code to ensure it’s compatible with Drupal 9!ĭrupal 7 vs. But, if you’re writing code in Drupal 8, you’ll need to monitor for accidental use of deprecated code. Note that if you’re writing your module in Drupal 9, you won’t find any deprecated code (yet) because all of the deprecated code from Drupal 8 has already been removed! Obviously, at some point Drupal 9 will start having deprecated again as we prep for the Drupal 10 release in or around 2022. Located crossed out functions in your IDE You can easily find code in the Drupal 8 codebase that has been marked as deprecated by: As such, if you’re writing code for Drupal 9 (and/or code that you intend to work on both Drupal 8 and 9) you have to ensure that you’re not using anything that is deprecated. One of the only differences between Drupal 8.9.x and Drupal 9.0.x is the removal of all code marked as deprecated in the Drupal 8.x API. Note that with this core version requirement file you can easily write modules that work for both Drupal 8 and Drupal 9 as long as you deal with deprecated code. Previously you defined this in your module’s. The core version requirement change was actually introduced in Drupal 8.7 to help differentiate between modules that support Drupal 8 and Drupal 9. The only “real” differences between Drupal 8 and Drupal 9 module development have to do with the way you declare the compatibility and which methods you can use during your work. That’s where a custom module comes into play!Ī module, at its very simplest, is a folder and one or more files that define the module for Drupal and provide functionality.ĭrupal 8 vs. that only apply to “your” code that you still need. However, you can’t always find a module for “everything.” Sometimes there are specific features required for a site, proprietary data changes, etc. For a sitemap, I typically recommend the simple sitemap module. Now, thankfully, in this particular example there are community created modules (contrib modules) that have been created for this purpose. Drupal provides no mechanism for doing this. Let’s take generating a sitemap.xml file for SEO as an example. That’s super cool!īUT there are a lot of things you might want to do that you just can’t out of the box. Thanks to the configuration management system you can tweak and build a lot of features for common, modern websites without ever writing a line of code. This post is all about preparing you for the new experience! What is a module and why do you care?ĭrupal core provides a super robust set of features out of the box. The module system in Drupal 9 is virtually identical to the Drupal 8 module system (so if you’re coming from that ecosystem, this shouldn’t be a big jump!) However, if you’re coming from an older version of Drupal (like Drupal 7) then there are going to be some really significant differences.
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