Room: Querying Relational Data Without Manual Joins
Room lets you query related objects without writing raw SQL joins, mapping one-to-many or many-to-many relationships into nested objects. This is key for fetching a user and their posts in one go.
Room abstracts away raw SQL joins, letting you query related data as nested objects. You define relationships between entities, and Room builds the complex queries, returning objects like `UserWithPosts` from a single DAO call. This is used for one-to-one (user/profile), one-to-many (user/posts), and many-to-many (song/playlist) models. The main footgun is fetching large, deep object graphs eagerly, which can cause significant UI jank or ANRs if not handled off the main thread.
Read the original → developer.android.com
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