If you’re interested in using Advanced Custom Fields ( ACF ) to create a restaurant menu, check out the video tutorial I made! You’ll learn about ACF and how to use a repeater field to loop over your user’s inputted data. Leave a comment if you’re interested in seeing more. Suggestions are welcome! 🙂
About 3 months ago, I had a killer idea for a WordPress plugin. I had never written a plugin before and my first venture was a daunting one to say the least. I have learned a lot over the past 3 months and so I’d figure I would share some of my experiences with you.
Lesson #1: v1 is Always Terrible
Yeah that’s right, I said it. When I finally released v1 to the public, there were a lot of problems. PHP 5.2 support? Meh, who needs it? I know a lot of premium plugin developers have dropped PHP 5.2 to take advantage of awesome features like closures, however, since my plugin is sort of an “add-on” for another WordPress product, I wanted to maintain compatibility as much as the other service. Needless to say, the first person who complained that their site got whitescreened after activating, definitely was not happy. Also, WordPress multisite support was also not included. Heck, I’ll honest, I had never even installed multisite before someone mentioned it on the support forums. Whoops. Point being, you will always miss stuff in version 1.0. That’s why we have version numbers! Software was designed to be improved. Don’t beat yourself up too much because things aren’t perfect from the starting line.
Lesson #2: You Know Nothing Jon Snow!
Specifically, in regards to how people will use your software. If you develop a product that allows for any user customization at all, someone will think of a way to use, abuse, and re-use your product in ways you could have never imagined. The feature that took me most by surprise, was the ability to include the plugin in a theme. First of all, MIND BLOWN! I never in a million years would have thought that my creation would be so cool, that someone would want to include it in a theme. Especially within the first month?! After recovering from a mild excitement induced heart attack, I then had to find a way to make everything play nice when not activated like a normal plugin.
One thing that I’m grateful I learned because of this, is the order in which hooks and filters are fired. For example, the action hook fired after the `functions.php` is loaded (`after_theme_setup`) is `init`. 99% of plugin and theme functions can be fired on or after `init` without any consequences and still have access to everything they need. All that was required to make my plugin “includable”, was moving any actions from `plugins_loaded` to `after_theme_setup`. Also, actions and filters are freaking cool! I never really understood how to utilize them effectively until I started using them on a more regular basis. Now I find myself skimming through other plugins looking for hooks and filters to extend their functionality too. It’s a great feeling when you find a problem and a quick glance at the codebase assures you that everything is extensible. Easy Digital Downloads is a great example of a plugin with tons of hooks and filters. Pippin has definitely been an inspiration to the way I look at plugin development.
Lesson #3: Open Source is your Friend
For the first couple of versions, I didn’t release the plugin on GitHub. Which ended up hurting me more than I thought it would. The day that I pushed the codebase to GitHub, something strange happened. I felt obligated to track every change I made. If I read a support email or just ran into a bug while testing, I would go to GitHub and open an issue. Even if the fix was just 1 line of code, I would open one. That small amount of perceived accountability, the knowledge that now anyone could look over my code and judge my decisions, made me better. While I haven’t received any contributions yet, I’m excited for what the future holds and more and more people start to use my creations.
A lot of people also have problems with putting “Premium” plugins in open repositories. First of all, everything used with WordPress is automatically subject to it’s license, the GPL. This means anyone can take the code and copy, modify, sell, distribute, etc, as much as they want. So if people really want it, they’ll get it. The benefit of having a project that anyone can contribute too, vastly outweighs any negatives in my opinion.
Lesson #4: You’ll Become an Addict
I finally understand why Pippin has written 100+ plugins in just a few short years. I’m hooked. Just the other day, someone over on a reddit thread in /r/WordPress was looking for a plugin to do something fairly simple from the admin area. I looked at his problem, thought about it for a minute, and then replied telling him to give me an hour to see what I could do. This led to the creation of Post Author Link, which I will eventually release on WordPress.org for everyone to enjoy. It’s a small plugin now at less than 30 lines of actual code, but it works! It solves a problem in an elegant way without being overly complex. The beauty of it is, that I wanted to write it. I wanted to help this random guy on the internet. For the first time, the kindness bug from the WordPress community infected me and I felt compelled to give back however I could. Now I catch myself browsing through sites like Reddit and WP Chat actively looking for people to help. WordPress has given me so much to become successful that I’m excited to give back to the community in any way I can.
Overall, I’ve learned a lot. I’ve learned to deal with abuse from my plugin website’s contact form, 700,000 API calls in less than a month that shut down my website, etc. The little things. My advice to anyone out there thinking about writing a plugin, premium or otherwise, do it. Stop thinking about it and do it. You’re never gonna learn or grow if you sit on your hands and think about all the things you could do. You are the only person standing in the way of your success. Don’t be afraid to screw up, because it happens to the best of us.
Brace yourselves. Updates are coming…
Have you ever used register_field_group() for a packaged theme or plugin? Most people haven’t. In fact, http://advancedcustomfields.com doesn’t even have documentation on the function. Where this function comes into play is if you try to register a field group (and subsequently, fields) with PHP using the ACF API. The easiest way to see this is by using ACF’s built in PHP export. The subsequent block of code that is rendered can be pretty daunting, and in my opinion, a little bloated depending on your application. For people exporting fields for a theme, it’s probably fine, but for someone writing a plugin that dynamically creates fields, this behemoth can be a pain to write and manage. My biggest beef is with the “location” key passed to register_field_group().
“Location” accepts a multidimensional array, mapping each key => value to the boolean-esque rules that are used to assign fields to a particular location in your WP installation. For example, only show this field for this particular page and the user is an administrator. Where this get’s to be a little overwhelming, is when you are registering a field to a lot of different areas, yet ignoring a lot of others. One example I’ve used recently is widgets. I want to add a text field to all the default WP widgets but not all the other ones. My location value may look something like this:[gist https://gist.github.com/6edebde58013f429b0bf /]
You can see how that can start to get a little ridiculous right? 60 lines for one value? Especially when most of it is repeated! So I wrote a function for generating these giant location arrays when all the values are similar.[gist https://gist.github.com/ac2f976d8929c7bd18c2 /]
In a nutshell you pass an array of locations that all share a similar a similar parent. In the case above, they were all widgets. Then you supply the operator to compare against and an $extended boolean parameter. The $extended variable is for when each location is a new rule. For example, I want to show this field when the widget is “Archives” or when the widget is “Meta.” The default logic to show a field is that all the parameters must match (and operator). We then pass this function to a variable which we use with the location rule of register_field_group().
$locations = acfw_location_rules( $wp_widgets, 'widget', '==', true ); register_field_group( array ( 'location' => $locations, // rest of the function goes here ... ) );
Hopefully you find uses for this in your own projects. I know for me, it was definitely a lifesaver for generating long arrays for location rules. I will admit, not being able to set to parameter for something like both “Widgets” and “Administrators” is a limitation, but I’m working on an elegant solution for those instances.
Leave a comment below if you have any questions! I’d be happy to help! Check out http://reddit.com/r/advancedcustomfields if you want to be part of a community all about ACF.
Let’s say I’m building a theme for my client “Joey’s Frog Arena.” When I start development, I would namespace all of the theme functions with
jfa_, or something similar, and be on my merry way. This is completely normal. Everybody namespaces themes as to avoid conflicts and create a sense of coherence throughout the code.
Something that didn’t occur to me until this specific project was the idea of using a namespace for fields within ACF. So let’s say Joey has 3 different wrestling shows, all of them with 6 participants in each show, totaling 18 different participants. For the sake of simplicity, I’ll call them actors (everyone knows wrestling is fake anyway). So each show is listed as a custom post type, morning, afternoon, & evening shows, and the actors in each show change from week to week. Joey wants his customers to be able to visit the website and see a list of upcoming shows and who is participating in each one.
So I would need to attach a field to each show type that allows Joey to list out the actors for each show. Normally I would call this
actors and move on. In the code, I would call this in the template with
the_field('actors'); and everything would be handy dandy. Joey would be happy, I would be happy, all is good with the world.
Three months later though, Joey comes back to me and says he wants to add a widget to the homepage that spits out all the actors who are performing that day. So I would make a widget that uses some custom queries to pull of that information in and put it on the page.
Pretty standard stuff right? Just do that 3 times for each post type with some extra stuff added as needed. I finish the feature, Joey pays his bill and I go back to working on other projects. Now let’s jump 1 year into the future.
Joey is back, and he wants some modifications done to the widget I made for him last time. Well, it’s been a year. I don’t remember any of this stuff. Now I have to sift through this code and find where these specific parts are coming from and alter the output of the functions.
ENTER NAME SPACING
Name spacing is a normal part of modern software development. It helps us to stay organized and provides a easy to recognize reference if we have to come back to something later and our documentation just isn’t cutting it. Recently I’ve found myself name spacing all my fields with the name of the field group. This obviously means that choosing the right field group name can be very important! For Joey, I would have had 3 field groups, Morning Show, Afternoon Show, and Evening Show, since those were the 3 post types I was adding fields to. So for the actors field, I would set the label as “Actors” as normal, but the field name would be “morning_show_actors” instead of just actors. Let’s say I had another field called “Location.” That field name would be “morning_show_location.” I hope you can see where this is going.
If I was utilizing a large template to display data from custom queries, I don’t want to have to scroll up and down my document to see what post type I was referencing for a specific field. By including the field group as a namespace, I know exactly what information I’m working with no matter where in the theme I’m using it. This also means I can use a “Find All” in my IDE and search for “morning_show_actors” and only get the one result I want, rather than 3 results for the search term “actors.”
Hopefully you can see the benefit to name spacing and will start to utilize it on your projects. Sure, it’s a pain in the ass to manually alter each field name instead of using the generated name from ACF, but a year or two down the line, you’ll be happy you did when you can’t remember the specifics from a given project.
P.S. After reading this blog post, I’m very disappointed in myself, but I’m putting it out there anyway, despite it’s sloppiness. Oh well. 😉
Advanced Custom Fields (ACF) is a plugin that adds easy access to creating, editing, and maintaining custom meta boxes and fields to WordPress. Using a very simple API, developers can show the values of these custom fields on the front end of by editing theme template files. The official ACF site has a lot of awesome documentation to show you how to use almost every feature included in the plugin, but today we are going to go a little further. Let’s take a look at adding custom profile fields to users in the backend and create a way for logged in users to edit that information without going to the dashboard.