A common use case for decrementing a value in Memcached using Ruby is when you're working with counters. For instance, this mechanism can be used to implement rate limiting or inventory management systems where you need to decrement the count of available requests or items.
Here is an example of how to use the
decr function in Ruby with Memcached:
In this example, we first require the
dalli gem, which is a high performance pure Ruby client for accessing memcached servers. Then, we create a new Dalli Client that connects to a memcached server running on localhost port 11211. We set a key called 'counter' to have the value 10. Finally, we call
decr on 'counter' which decrements its value by one and then print the new value.
Note: If the key does not exist or the current value is not an integer, it will return nil.
decr. This will prevent possible errors or unexpected behavior.
incrwhenever possible instead of getting a value, changing it, and setting it back. This helps avoid possible race conditions.
decr on a non-existing key or one that is not an integer. Ensuring that the key exists and is of the correct type before using
decr can help avoid these errors.
decron a key that doesn't exist?
dalli_client.decr('counter', 5)would decrease 'counter' by 5.