Question

There are some instance methods on Redis class. They are defined in the source code and they work. BUT they don’t show up in Redis#methods output!

require 'redis'

redis = Redis.new # => #<Redis client v3.0.2 for redis://127.0.0.1:6379/0>
redis.info['redis_version'] # => "2.6.4"

k = 'foo'
redis.setbit k, 1, 1
redis.setbit k, 3, 1
redis.setbit k, 11, 1

redis.bitcount k # => 3

redis.methods.grep(/bit/) # => [:setbit, :getbit]
# no bitcount in the methods!

Method definitions: getbit, setbit, bitcount, bitop.

From what I can tell, bitcount/bitop should appear in methods. But they don’t. Any thoughts?

I need them to be listed in methods so that another gem works (it defines proxy methods for redis commands which it gets from Redis#methods).

Answer 1

The released version of the gem does not define those methods explicitly, you can confirm this by checking your installed source or redis.method :bitcount

https://github.com/redis/redis-rb/blob/v3.0.2/lib/redis.rb

They work because the method missing simply passing them on to the redis server blindly.