A collection of Ember template helpers for working with promises, enabling reactive rendering when promises resolve or reject.
Ember Promise Helpers is an Ember.js addon that provides a set of Handlebars helpers to work with promises directly in templates. It solves the problem where Ember templates do not re-render when promise states change, such as when dealing with asynchronous data like Ember Data relationships. The helpers allow templates to reactively update based on promise resolution or rejection, keeping the UI in sync with asynchronous operations.
Ember.js developers who need to handle asynchronous data, particularly those using Ember Data relationships or other promise-based APIs in their templates. It is especially useful for developers building applications where templates must reflect the state of pending, resolved, or rejected promises without extra boilerplate.
Developers choose this addon because it simplifies working with promises in Ember templates without requiring wrapping objects in PromiseProxyMixin or handling promise states in controllers and routes. Its declarative helpers like 'await' and state-check helpers keep templates clean and reactive, reducing complexity and improving developer experience compared to manual promise handling.
Promise-y sugar for your Ember templates.
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The await helper allows templates to reactively display resolved promise values, eliminating manual re-renders when promises change, as shown in the example with model.author resolving from 'No author!' to displaying the name.
Helpers like is-pending, is-rejected, and is-fulfilled provide easy ways to manage loading and error UI states directly in templates, per the README examples for conditional rendering based on promise status.
Await works as a Handlebars subexpression, enabling seamless integration with other helpers, components, or alone, such as passing to twitter-timeline or using in #each loops, as demonstrated in the examples.
Includes promise-all and promise-hash for handling multiple promises collectively, useful for scenarios requiring coordinated asynchronous data updates without extra JavaScript boilerplate.
Relies on Ember.RSVP, which may become deprecated or replaced in future Ember versions, risking breaking changes and necessitating updates for long-term maintenance.
Introduces an external dependency that requires installation via ember install, potentially complicating project setup, increasing bundle size, and adding update burdens.
The README provides basic examples but lacks detailed guides on edge cases, performance implications, or integration with modern Ember practices like Octane, which could hinder adoption in complex projects.