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INTRODUCTION

This gem is exceptionally simple but also very handy. Let's say you are working in ActiveRecord and you have loaded a collection of objects in a query. You now want to preload associations for these already retrieved objects. This allows you to do that.

USAGE

The usage of this is very straightforward:

@users = User.all
@users.preload(:posts)

This will eager load all posts for each user even after the initial find query has taken place. You can also use this to preload associations for a member as well:

@user = User.first
@user.preload(:posts)

Why not just do?

@user.includes(:posts).all

Good question. In most cases this is the better option. This code is for when that approach is not available.

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