November 08, 2023

Ensuring Unique Data Entries in Phoenix Applications

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Ensuring Unique Data Entries in Phoenix Applications

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

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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.

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