Ashik Salman questions

Ashik Salman answers

• Rails NameError uninitialized constant (Model and Namespace Collision)
• Ruby On Rails 5, activerecord query where model association ids includes ALL ids in array
• Hacking ActiveRecord: add global named scope
• Routing Error: uninitialized constant
• Rails and OS X: How to install rmagick?
• Rails has_one association, accessing associated models