Question

I have a rake task I created and inside it I have the line

number = rand(1..10)

When I run this on my development machine everything is ok, however, when I run it on Heroku I’m returned an error

rake aborted!
can't convert Range into Integer
/app/lib/tasks/sample_data.rake:57:in `rand'

I should note that earlier in the rake task I ran rand(111) without fail. I have to assume the problem is caused by me setting a start and end point for rand to choose from.

So the big questions is, why does Heroku treat rand as a range and not as an integer and how do I fix this?

Answer 1

Range support in rand() was added in Ruby 1.9.3. You’re likely running 1.9.2 (the default) on Heroku. You can run 1.9.3 on Heroku by adding ruby "1.9.3" to your Gemfile.

• http://www.ruby-doc.org/core-1.9.2/Kernel.html#method-i-rand
• http://www.ruby-doc.org/core-1.9.3/Kernel.html#method-i-rand