Due to a quirk in memcached, I believe you actually want to store a string representation in order to use incr/decr.
Try changing the second line to CACHE.set('abc', '123') and see if that works. On Thu, Jan 20, 2011 at 11:47 AM, Josiah Ivey <josiah.i...@gmail.com> wrote: > Using both the Dalli and Memcached-client gems, I am unable to > increment a numeric value: > > ruby-1.9.2-p0 > CACHE = MemCache.new 'localhost:11211' > => <MemCache: 1 servers, ns: nil, ro: false> > ruby-1.9.2-p0 > CACHE.set('abc', 123) > => "STORED\r\n" > ruby-1.9.2-p0 > CACHE.get('abc') > => 123 > ruby-1.9.2-p0 > CACHE.incr('abc') > MemCache::MemCacheError: cannot increment or decrement non-numeric > value > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:926:in `raise_on_error_response!' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:831:in `block in cache_incr' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:865:in `call' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:865:in `with_socket_management' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:827:in `cache_incr' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:342:in `block in incr' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:886:in `with_server' > from /Users/josiahivey/.rvm/gems/ruby-1.9.2-p0/gems/memcache- > client-1.8.5/lib/memcache.rb:341:in `incr' > from (irb):6 > from /Users/josiahivey/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in > `<main>' > > Any ideas? > -- awl