Checking if a variable is not nil and not zero in ruby

Question

I am using the following code to check if a variable is not nil and not zero

if(discount != nil && discount != 0) 
  ...
end

Is the

Answer 1

When dealing with a database record, I like to initialize all empty values with 0, using the migration helper:

add_column :products, :price, :integer, default: 0