lis

#!/usr/bin/env ruby
## Shows model relationships on the given RoR app.

## add --help
## ?? add --belongs to filter out only given macros
##  put message 'nothing relates' if models but no associations found.
puts ARGV

Dir.chdir( ARGV.shift || '.' )  do

# Load the app.
# Gives us the inflections and ability to find valid class names.
require 'config/environment'

# # look for classes derived from ActiveRecord

#   finder = 'grep ActiveRecord::Base app/models/*.rb'
  finder = 'find app/models -type f -name \*.rb -print0 |xargs -0 -- grep ActiveRecord::Base |sort'

  %x[#{finder}].map do |line|

    line =~ /class (\w+)/
    model = Object.const_get $1		# get the class from string
      puts "#{model}"
    relation_shown = nil

    o = []
  model.reflect_on_all_associations. each do |assoc|
        assoc.options[:through].nil? or next        # a :through relation will have the :has_many elsewhere.

      related = (
          assoc.options[:class_name] ||     # if :class_name is specified in the assoc
          assoc.name.to_s.classify        # else use assoc name as class_name
      )
      # This model relates to the related model, by :macro ( belongs_to, has_many ... )
      o << "    #{assoc.macro} #{related}"
      relation_shown = true
    end
      o << "    (no relations)"  if relation_shown.nil?
      puts o.sort.uniq
  end

end