Question

I have a lot action methods which do not need to create instance variable for rendering the view, because these method will only redirect to other actions from other controllers. I am wondering: is it a good habit to always create instance variable for the sake of following the conventions of Rails, or there is no such thing. My intuition is that local variable reduces memory costs, but the code does not look pretty.

Answer 1

Mostly we need to use instance variable in following cases,

1. When we need to access the variable from view
2. If we are calling a method from the action, instead of returning a value, we can directly update the variable from the called method.

Why should we use instance variable if our job can be done with a local variable.