Building Dynamic and Secure Query APIs with Elixir and Ecto

The article discusses the complexity that often arises in web application projects when user-generated database queries are involved. It provides a guide on how to build a secure and flexible querying API using Ecto in Elixir, similarly to MongoDB. It starts with basic query composition and moves on to more advanced concepts using Ecto's `field/2` and `dynamic/3` functions. Examples are illustrated, including building complex queries dynamically from user inputs. The content is based on learnings from creating Keila, an open-source alternative to MailChimp in Elixir.