How to optimise the code

How would I optimize the following code?

def posts_for_30_blogs
blogs = Blog.limit(30)
blogs.flat_map do |blog|

Optimise in what sense? If this is about solving the N + 1 query problem
then try:

blogs = Blog.include(:posts).limit(30)

This should load associated posts with only 1 query.

Greg Navis
I help tech companies to scale Heroku-hosted Rails apps.
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Thanks very much…