November 08, 2023

Ensuring Unique Data Entries in Phoenix Applications

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Source: phoenixonrails.com

George Arrowsmith's piece focuses on implementing foolproof uniqueness validations within a Phoenix application, which is essential for fields like user emails. He explains the process of using the `Ecto.Changeset` module to perform various validations, such as ensuring the presence and format of email fields. However, uniqueness validations pose a distinct challenge, as they require checking against existing database records to prevent duplications. This issue can lead to race conditions, where simultaneous operations cause a breach of uniqueness. To address this, Arrowsmith explains the use of the `unique_constraint/3` function from Ecto, which needs to be paired with a unique index in the database to work correctly. This function helps in handling database errors without crashing the application, ensuring a smooth user experience. He also introduces `unsafe_validate_unique/4`, a complementary strategy to catch duplicate entries before they reach the database. It's deemed 'unsafe' because it's susceptible to race conditions, but in combination with `unique_constraint/3`, it offers thorough validation. Overall, this validation approach surpasses the capabilities of equivalent strategies in Rails, showcasing Phoenix and Ecto's finesse in handling database constraints and errors.

Creation of Disk Cache Plugin for Req HTTP Client in Elixir

Thibaut Barrère shares a guide on implementing a disk cache plugin for Elixir's Req HTTP client. The plugin allows for automatic caching of API responses, improving speed and efficiency for data-processing scripts.

Sep 09, 2022

Release of Bandit and Thousand Island 1.0.0

Mat Trudel announces that Bandit and Thousand Island are both reaching version 1.0.0 today, after almost four years of development. Mat reflects on the progress made and highlights exciting future plans, thanking the community for their contributions and support.

Oct 19, 2023

Continuation of LiveView Native's Journey Toward Version 0.2

Brian Cardarella discusses the challenges faced in representing SwiftUI's modifier system in LiveView Native and the solutions they have come up with. They have advocated for changes in both Phoenix and Elixir to improve the integration and are working towards better dev ergonomics and format implicit layout rendering in LiveView.

Nov 01, 2023