Load users in Rails console by username via method_missing

console_include.rb

#adapt to your ORM/ODM as needed
#put in outermost scope of a file require'd into an IRB session

def self.method_missing(method_name, *args, &block)
  User.where(username: method_name).first || super
end

# usage
# $ rails c
# >> dzello.username
# "dzello"

And for a username with the first letter capitalized:

send "Dzello"

to avoid uninitialized constant errors.

This is cool :)