November 07, 2023

Mastering Ecto.Query's fragment Macro in Elixir

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Mastering Ecto.Query's fragment Macro in Elixir

Source: youtube.com

Alexander Webb delivered a talk focused on unleashing the full potential of `fragment`, a macro in Ecto.Query that allows for improved versatility in dealing with SQL syntax beyond DSL's native capabilities. Webb illustrates how `fragment` facilitates the use of advanced PostgreSQL features, transforming deeply nested joins into performant, nested JSON queries, which Ecto can turn into Elixir nested maps. Throughout the presentation, he emphasizes that while Ecto.Query is powerful enough for standard database operations, the `fragment` macro is invaluable for advanced database features, particularly those pertaining to PostgreSQL's document capabilities. He also highlighted Ecto's extensibility, its composable qualities, and how Ecto and PostgreSQL can be combined efficiently with custom macros to reduce duplication while maintaining security against SQL injection vulnerabilities.

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