[Solved] undefined method `round’ for nil:NilClass when calculating difference between dates [closed]

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Introduction

When calculating the difference between two dates, you may encounter the error “undefined method `round’ for nil:NilClass”. This error occurs when the difference between the two dates is nil, meaning that the two dates are the same. This error can be solved by checking if the difference between the two dates is nil before attempting to round it. In this article, we will discuss how to solve this error and provide some examples of how to check for nil values.

Solution

The error message “undefined method `round’ for nil:NilClass” indicates that you are trying to call the round method on a nil object. This means that one of the objects you are trying to calculate the difference between is nil.

To solve this issue, you need to check the objects you are trying to calculate the difference between and make sure they are not nil. If they are nil, you need to assign a valid value to them before attempting to calculate the difference.

OK, it’s not possible to help you with this directly as too much code is missing (and, frankly, it’s probably to much to just cut&paste it in here and expect people to debug it in their brains…).

In cases like this, you have to figure out

  1. Which variable is nil
  2. Why is it nil

In your example, there will be some call xyz.round on line 96 of rent.rb. The xyz is nil (exactly what the message says). Find why that is and your problem will go away.

You can sprinkle your code with debug statements like puts ">>>>> #{xyz.inspect}" or logger.debug "...", or find out how to single-step a debugger if you prefer that.

solved undefined method `round’ for nil:NilClass when calculating difference between dates [closed]

If you are getting an error message saying “undefined method `round’ for nil:NilClass” when calculating the difference between two dates, it is likely that one of the dates is nil. This means that the date is not set, and therefore cannot be used in the calculation. To fix this, you need to make sure that both dates are set before attempting to calculate the difference between them.

The easiest way to do this is to use the nil? method to check if either of the dates is nil. If either of them is, you can set it to the current date or some other date before continuing with the calculation. For example:

if date1.nil?
  date1 = Date.today
end

if date2.nil?
  date2 = Date.today
end

difference = (date2 - date1).round

Once both dates are set, you can then calculate the difference between them and round the result as needed. This should fix the “undefined method `round’ for nil:NilClass” error.