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AppSignal Academy

AppSignal is all about building better apps. In our Academy series, we'll explore application stability and performance, and explain core programming concepts.

Rails Collection Caching

By Tom de Bruijn on

In this article, we'll take a look at how Rails collection caching works and how we can use it to speed up large collection rendering.

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Generating Random Numbers in Ruby

By Joyce Echessa on

Random numbers are useful for a variety of purposes such as in gaming, encryption and building simulations. In this article, we'll look at the various ways you can generate random numbers in Ruby.

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JavaScript-sprinkled Rails Applications

By Jeff Kreeftmeijer on

Using JavaScript sprinkes to load dynamic or user-specific content after the rest of the page is directly served from the cache.

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Custom Exceptions in Ruby

By Robert Beekman on

Almost everything in Ruby is an object and errors are no exception.

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Caching counters with ActiveRecord's counter caches

By Jeff Kreeftmeijer on

Instead of counting the associated records in the database every time the page loads, ActiveRecord’s counter caching feature allows storing the counter and updating it every time an associated object is created or removed.

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Ruby's redo, retry and next keywords

By Thijs Cadier on

We've talked about the retry keyword before. Its little-known counterpart redo works similarly, but reruns loop iterations instead of whole blocks.

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Speeding up your app’s navigation with Turbolinks

By Jeff Kreeftmeijer on

Turbolinks is an optimization that increases the perceived performance by being smart about switching pages and reloading assets in your app.

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Ensuring execution, retrying failures and reraising exceptions in Ruby

By Jeff Kreeftmeijer on

Besides `rescue`, Ruby has more ways to handle exceptions. We'll use the `retry` and `ensure` keywords and reraised exceptions to build a resilient web API client.

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Client-side caching in Rails:
conditional GET requests

By Jeff Kreeftmeijer on

Rails' conditional GET support allows you to store rendered pages in the user's browser cache to reuse them for repeated requests instead of rendering the same view multiple times.

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ActiveRecord performance:
the N+1 queries antipattern

By Jeff Kreeftmeijer on

The N+1 queries problem is a common, but usually easy to spot, performance antipattern that's sometimes caused by lazy loading associations.

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Rails' built-in cache stores:
an overview

By Jeff Kreeftmeijer on

Rails' cache stores can store the data in memory, Memcached, Redis, or even straight to disk. But which of the different cache stores is best for which situation?

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Rescuing exceptions in Ruby

By Jeff Kreeftmeijer on

A raised exception can be rescued to prevent it from crashing your application once it reaches to top of the call stack. In this article, we'll examine different ways to rescue exceptions.

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