find_or_create_by
method but I didn’t know it had a very useful companion
create_with
.
@something ||= SomeModel.create_with(some: "stuff").find_or_create_by(foo: "bar")
This will either find a record
SomeModel.where(foo: "bar")
or create it with
SomeModel.create(foo: "bar", some: "stuff")
. Very useful.
found = ModelA.find_by(id: id) || ModelB.find(id)
I stumbled over this during a code review. It was supposed to look for a record in two distinct tables.
find_by
will return
nil
if nothing was found while
find
will
raise
. Hence either you get something (from any model) or you
raise
.
Very entertaining talk about some of Ruby‘s quirks. 😀
https://alpha.app.net/riyad/post/16862808
https://alpha.app.net/riyad/post/10856992
I just felt the need for a script that could extract the audio track of a video, transcode it and save it as an mp3 file … 2 hours later I was finished (get the Gist). 😀 It uses VLC to do hard work. 😉
Thanks to Kris Hom for the inspiration. 🙂
Update 2014-03-01:
Update 2014-11-05:
Update 2016-03-05
Two great talks from RubyConf 2012:
You can find more talks from that conference on YouTube … one I already mentioned. 😉
I take my head off to Jim, that’s a great way to approach a weird intersection of mathematics and programming. 😉 For those who are curious … he uses a very simple mathematical algorithm to explore how you can express recursions in Lambda calculus and thus “derives” the Y combinator.
Totally useless, but worth every minute. 😉
My patch for revamping the comments and adding proper discussion threads has been accepted and will be in GitLab 4.1 (due next week). 😀
I found this command line magic gem some time ago and was using it ever since.
I started using it for synchronizing directories between computers on the same network. But it felt kind of clunky and cumbersome to get the slashes right so that it wouldn’t nest those directories and copy everything. Since both source and destination machine had the same basic directory layout, I thought ‘why not make it easier?’ … e.g. like this:
It uses rsync for the heavy lifting but does the tedious source and destination mangling for you. 😀
You can find the code in this Gist.