What is eager loading and how does it work in different frameworks?

What is eager loading and how does it work in different frameworks?

Eager loading is a design pattern used to load related data at the same time as the main data. In frameworks like Rails, it preloads associations to avoid N+1 query problems.

Can you give me an example of eager loading in Rails?

Sure! In Rails, you can use the includes method. For example, Post.includes(:comments).all loads all posts along with their comments in a single query.

How does eager loading differ in Django?

In Django, you use the select_related and prefetch_related methods. select_related is for single-valued relationships, while prefetch_related is for many-to-many or reverse relationships.

Are there performance considerations I should be aware of?

Yes, eager loading can improve performance by reducing the number of queries, but loading too much data at once can lead to increased memory usage.