Saving a new value to the db using the whenever gem - ruby-on-rails

Question

I'm trying to save a value in my db every hour. Let's say it saves a random string of characters to the letter field in my randomizer table. I have the whenever gem installed and my schedule.rb runs every hour calling a class method in my model. It doesn't seem to save a value the way I have it set up.
Here is my schedule.rb:
set :output, "#{path}/log/cron.log"
set :environment, 'development'
every 1.hour do
runner "Randomizer.rand_letters"
command "echo 'random job attempted.'"
end
Here is my Randomizer model:
class Randomizer < ActiveRecord::Base
def self.rand_letters
#random_string = Randomizer.new(letters: 'asdfg')
#random_string.save
end
end
Here is my output when I run whenever:
0 * * * * /bin/bash -l -c 'cd /home/action/workspace/word-vomit && bin/rails runner -e development '\''Randomizer.rand_letters'\'' >> /home/action/workspace/word- vomit/log/cron.log 2>&1'
0 * * * * /bin/bash -l -c 'echo '\''random job attempted.'\'' >> /home/action/workspace/word-vomit/log/cron.log 2>&1'
## [message] Above is your schedule file converted to cron syntax; your crontab file was not updated.
## [message] Run `whenever --help' for more options.