It is sometimes required for the methods with optional arguments to be able to differentiate between its default value and the value passed from the caller. Passing nil might initially sound like a good idea since it ... Read on →
Imagine that you are implementing some form object because you are fed up with treating ActiveRecord models as such, and you need some extra flexibility. You start with a straightforward implementation for a base clas... Read on →
Touching ActiveRecord models is quite a common thing in most of the Rails applications, especially useful for cache invalidation. By default, it updates updated_at timestamp with the current time, Here’s a typical exa... Read on →
Imagine that you are implementing an e-commerce platform and want to grab all orders from the current year. What would be the simplest way of doing it in Rails? Probably writing a query looking like this: Read on →
Recently, I’ve had quite a popular problem to solve: count the occurences of the given item in a collection. There are few ways to solve this problem - starting from using Enumerable#inject or Enumerable#each_with_obj... Read on →
One very useful feature of ActiveRecord is automatically defining attribute readers and writers for all the columns for given tables. For the ones with boolean type, however, there is one more addition - defining an a... Read on →
Ember.js is a web frontend framework and it’s no surprise that majority of the applications deal with a lot of HTTP requests. But such fact has a lot of implications on the process of development of the Ember apps, es... Read on →
In the majority of the Rails applications or even Ruby gems you can find a lot of use cases where you need to memoize a result of some computation for performance benefits and to not compute it again if this result ha... Read on →
Timeouts and delays are quite extensively used in many applications when deferring execution of some action via Ember.run.later or debouncing via Ember.run.debounce. Having small amounts of tests executing such method... Read on →
Thanks to the awesome tools in Ember ecosystem such as ember-cli-mirage, ember-qunit or ember-test-helpers writing majority of the tests is pretty straight-forward. Nevertheless, there are quite a few cases where simu... Read on →
Imagine a use case where you are trying to check if a user accessed your app from a mobile device or not. Most likely you will need to use navigator.userAgent property and craft some smart regular expression to test ... Read on →
Arrow function expressions were definitely a great addition in ES6 and thanks to tools like babel the new syntax has been quite widely adopted. Besides more concise syntax, an interesting thing about arrow function ex... Read on →
Soft delete is a pretty common feature in most of the applications. It may increase complexity of the queries, nevertheless, not deleting anything might be a right default as the data might prove to be useful in the f... Read on →
Every now and then I discover some features in Rails that are not that (arguably) commonly used, but there are some use cases when they turn out to be super useful and the best tool for the job. One of them would defi... Read on →
Is validation in your models or form objects enough to ensure integrity of the data? Well, seems like you can't really persist a record when the data is not valid unless you intentionally try to bypass validation usin... Read on →
Ordering with ActiveRecord and PostgreSQL may seem like an obvious and simple thing: in most cases you just specify one or several criteria with direction of ordering like order(name: :asc) and that's all, maybe in mo... Read on →