How to Filter Results on Deeply-Nested fields in Strapi

The article provides a detailed exploration of how to utilize Strapi, a headless CMS, to filter data based on deeply nested relational fields, specifically focusing on filtering books by their authors' hobbies. It outlines the process of setting up a Strapi project, creating collections such as "Book" and "Author," and using API requests to filter books written by authors whose hobbies include "dance." The text illustrates various methods to achieve this filtering, including using the REST API with query parameters, programmatically constructing queries in the frontend, and employing the Query Engine API and Entity Service API for backend data retrieval. Additionally, the article covers using GraphQL queries for similar purposes, demonstrating Strapi's flexibility in handling complex data structures. The discussion is supported with sample code and requests, showcasing Strapi's capabilities in filtering and managing relational data efficiently.