Efficiently Update Multiple Records in Ecto Using PostgreSQL and Fragments

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Efficiently Update Multiple Records in Ecto Using PostgreSQL and Fragments

Source: geekmonkey.org

Type: Post

Fabian Becker details a method to update multiple records efficiently in an Elixir application using Ecto. The article walks through a scenario of updating a parent-child hierarchy in a database, which is achieved by using Ecto's `update_all/2` function in conjunction with PostgreSQL's `unnest` function. The process involves transforming tuples of record IDs and their new values into arrays and utilizing Ecto query fragments to perform the update in a single efficient database call.

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