From 9a1323aa4c4ccfac10ccb9b77b8817e232f8338b Mon Sep 17 00:00:00 2001
From: fatkodima <fatkodima123@gmail.com>
Date: Wed, 10 Sep 2025 18:30:53 +0300
Subject: [PATCH] Add suggestions for checking if collection is empty

---
 README.adoc | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/README.adoc b/README.adoc
index cf59a43..7ce2351 100644
--- a/README.adoc
+++ b/README.adoc
@@ -1069,6 +1069,25 @@ User.all.size
 User.all.length
 ----
 
+=== Check if the collection is empty [[check-empty-collection]]
+
+When checking if the unloaded Active Record collection is empty, prefer `any?`/`empty?` over `present?`/`blank?`. The former executes a simple `EXISTS`-like query while the latter loads the whole collection to determine its size.
+
+[source,ruby]
+----
+# bad
+users.where(active: true).present?
+users.where(active: true).blank?
+
+# good
+users.where(active: true).any?
+users.where(active: true).empty?
+
+# good - the collection is used after loading
+users.present?
+users.each(&:notify)
+----
+
 === Where with Ranges [[where-ranges]]
 
 Use ranges instead of defining comparative conditions using a template for scalar values.