👀 Views: 138 💬 Answers: 1 📅 Created: 2025-06-10

ruby rails activerecord Ruby

I'm stuck on something that should probably be simple. I'm refactoring my project and I'm working with an scenario where `find_by` returns `nil` unexpectedly when I'm trying to fetch records using a custom scope in my Rails 7 application. I have a model `User` with a custom scope defined like this: ```ruby class User < ApplicationRecord scope :active, -> { where(active: true) } end ``` When I try to find a user by email using this scope, I'm not getting the expected result. Here’s how I’m attempting to call it: ```ruby user = User.active.find_by(email: 'test@example.com') ``` Despite having a user with that email address and `active` set to `true`, `user` ends up being `nil`. I've double-checked the database entries, and there's definitely a matching record. To troubleshoot, I tried the following: 1. I ran `User.active.to_sql` to see the generated SQL query, which looks correct: ```sql SELECT "users".* FROM "users" WHERE "users"."active" = true ``` 2. I checked the database directly with a SQL client, and the record appears. 3. I also tried using `User.where(email: 'test@example.com').active.first`, and this returns the user as expected. It seems that the combination of using `find_by` with a custom scope is causing the scenario. Is there something specific about how `find_by` interacts with scopes that I’m missing? Any insights or suggestions on how to resolve this would be greatly appreciated! The stack includes Ruby and several other technologies. I'm working with Ruby in a Docker container on CentOS. This is my first time working with Ruby latest. Any advice would be much appreciated.