Aqua query criteria DSL, take 2

# Available operators for overloading criteria interactions
#  +  &  |  <  >  <=  >=  =~  ==  <=>    

# criteria creator for matching a hash/array value at a particular location
# good for hash/array objects or their derivatives
Klass.query do |obj|
  obj[3] == "something" |
  obj[:key] == "value" 
  # obj.has_value(my_value, :at => :key) 
  # has_value is alt syntax, could include options for :key/:index to specify hash or array
  # could also receive options that restrict class, etc
end 

# instance variables
Klass.query do |obj|
  obj.variable(:ivar_name) == "something"
  # obj.var(:ivar_name) == "something"    # alias for variable
  # obj.has('@stuff') = {:this => 'that'} # alias for has
end


# mixing them up
Klass.query do |obj|
  obj.variable(:ivar_name)['key'] =~ /something/
end