#EMBER CASES HOW TO#

Mixing sync and async can surprise developers in exactly the same ways we were trying avoid by using only sync relationships in the first place. We've found that sync relationships work best when you're able to use them for every relationship in your project (Storefront actually has an option to enforce this). There are some more goodies in there like run-time development assertions, so be sure to check back on it regularly as we continue to develop it. With sync relationships, this CP always works. In this post I'll outline why we think using relationships we would've needed to be aware of calls to this.get('comments') and comment.get('author') returning promise proxies. Likewise, the button has no need to know anything about the context where it’s being used from the button component’s perspective, it just gets wired up to some actions as usual.If you've spent any time around Sam and me, you've probably heard us talk about our frustrations with Ember Data's async relationships. The button can be used wherever a button is useful, and the modal doesn’t need to know or care anything about it. That makes our modal and our button way more reusable across our application. Doing it this way means that our modal can be concerned about positioning a button without needing to expose an API for all of the button’s own mechanics for handling clicks and performing whatever actions necessary. However, they also let us cleanly separate different pieces of functionality from each other. Splitting things into components like this does increase complexity, and in particular it can increase the mental overhead of keeping track of how the pieces fit together. They’re also a lot less complicated than the name might seem! Components are just things you can pass around in the context of a component template-they’re the functions of Handlebars. “Higher-order components” aren’t necessarily something you need all the time, but they’re really convenient and very powerful when you do need them. 3 We could even pass it into some other component itself if we so desired.Īnd that’s really all there is to it! Summary Here, we “call the function”-invoke the x-modal component-with component 'x-button' as its argument, and the returned ction is a component we can invoke like a normal component.

But modal is a hash (an object!) with a property named section, which is the x-modal-section component.Īgain, you can think of this like calling a function with one function as an argument and getting another function back as its return value-that returned function being something we could call over and over again once we had it. However, one of the arguments we pass to it is a component. In this case, Rails will look for a serializer named PostSerializer, and if it exists, use json:api, popularized by the Ember (and Rails) community. We invoke the block form of x-modal just like we would any block component, and we get back the thing it yields with as |modal|. The content can have its own sections, as you'd expect! The reason is precisely that there is no backing JavaScript component. Note that one of the most important consequences of this is that arguments have to be referenced as rather than just theArgumentName in templates. Both are very much ready-to-go in Ember, and I commend them to you! I’m also going to be using some of the new optional features available in Ember 3.1+ to use template-only components! I’m going to be using classes and decorators throughout. (If you just want to see how the pieces fit together, you can see the finished app in this repo.)

#EMBER CASES HOW TO#

In this little post, I’ll show you how to build a small “higher-order component” in Ember.js, hopefully demystifying that term a little bit a long the way. The same pattern is incredibly useful in building components, and most modern front-end frameworks support it-including Ember.js! (In React, the pattern as a whole is often known as the renderProps pattern, for the way you most often accomplish it. If you’ve spent much time at all working in JavaScript, you’ve certainly encountered these-whether you’re using Array.map to transform the values in an array, or passing a function as an argument to an event handler. One of the most powerful patterns in programming is the idea of higher-order functions: functions which can take other functions as arguments or return them as their return values.

Ember cases