ruby.rb

#!/usr/bin/env ruby

# require 'byebug'
require 'httparty'

class Redmine
  include HTTParty
  base_uri '192.168.1.150'
end # Redmine class

class Project < Redmine

  RMUSER='username'
  RMPASS='password'

  def create(name)

    # create identifier from name
    # Length between 1 and 100 characters. Only lower case letters (a-z),
    # numbers, dashes and underscores are allowed, must start with a lower case letter.
    # Once saved, the identifier cannot be changed.
    identifier=name.downcase.gsub!(/\W+/, '_') # replace non-word chars with underscore

    xml="<project><name>#{name}</name><identifier>#{identifier}</identifier></project>"

    Redmine.post(
      '/projects.xml',
      :basic_auth => {
        :username => RMUSER,
      :password => RMPASS },
      :body => xml,
      :headers => {'Content-type' => 'text/xml'}
    )

  end # create method

end # Project class

Redmine::Project.create("TestProject")
# This fails with error(s):
# 	./Redmine.rb:39: warning: toplevel constant Project referenced by Redmine::Project
# 	./Redmine.rb:39:in `<main>': undefined method `create' for Project:Class (NoMethodError)