rails params require check exists

To check if a parameter exists in Ruby on Rails using the "params" object, you can follow these steps:

1. Access the parameter using the "params" object, for example: params[:param_name].
2. Use the "present?" method to check if the parameter exists, like this: params[:param_name].present?.
3. If the parameter exists, the "present?" method will return true; otherwise, it will return false.

These steps allow you to effectively check for the existence of a parameter in a Ruby on Rails application using the "params" object.