👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-09

ruby rails activesupport Ruby

I'm performance testing and I've encountered a strange issue with I'm working on a project and hit a roadblock..... I'm working with an scenario when trying to use `ActiveSupport::Concern` for a module that includes class methods in my Rails 6.1 application. I have a concern that defines a class method, but when I try to call this method from a model that includes the concern, I receive a `NoMethodError`. Here’s the relevant code: ```ruby module MyConcern extend ActiveSupport::Concern included do # Instance method def instance_method 'Hello from instance method!' end end class_methods do def class_method 'Hello from class method!' end end end class User < ApplicationRecord include MyConcern end ``` When I attempt to call `User.class_method`, I get the following behavior: ``` NoMethodError: undefined method `class_method' for User:Class ``` I have confirmed that the `MyConcern` module is included correctly in the `User` class. I’ve tried restarting the Rails server and also checked for any typos, but the behavior continues. I also tried defining the class method without the `class_methods` block, but that didn't work either. Could someone guide to understand why I’m getting this behavior and how to fix it? Is there a specific order or structure that I need to follow when using `ActiveSupport::Concern` for class methods? For context: I'm using Ruby on Ubuntu. This is for a CLI tool running on Debian. Any ideas what could be causing this? Any help would be greatly appreciated!