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<Guest24881>
Hi, I am a beginner in ruby and im having trouble with assignment of instance and class variables
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<weaksauce>
Guest24881 what's happening?
<Guest24881>
I'm making a NIM game for a school assignment. When I choose a specific board configuration, another method of the same class takes the instance variable for the game board and sets it to one of the two class variables that are board configurations.
<weaksauce>
can you gist what you are doing right now?
<weaksauce>
before it was defining boardConfig as a local variable and now it's trying to actually assign it to the class variable but you have no setter
<Guest24881>
so when I want to set class vars or class instance vars I should always use self?
<Guest24881>
and it will work as I need it to?
<weaksauce>
you can either define a method to set that or use attr_accessor :boardConfig in your class
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<Guest24881>
so attr_accessor is basically what I should be using
<Guest24881>
and then I need no setters or getters
<weaksauce>
unless you are doing something else with the getters and setters yes
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<weaksauce>
like validation or what have you. but for just having a variable be exposed to outside use use attr_accessor
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<weaksauce>
you should only use getters and setters if you need to access instance variables outside the class though
<weaksauce>
for most of your code you should use @whatever instead
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<Guest24881>
okay.
<Guest24881>
i feel like there is just something I am not understanding about ruby
<Guest24881>
and it's probably to do with not working with it enough
<Guest24881>
but coming from c++ it's just weird at times
<Guest24881>
I had no problems using regex to solve a real problem
<Guest24881>
now making this game is a nightmare
<Guest24881>
I appreciate your help, I think it helps me a bit
<weaksauce>
cool. ruby is not c++ is the thing. to be good at ruby you need to unlearn some things that c++ made you do
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<Guest24881>
well I come from a bit of c and java too
<weaksauce>
java is the worst for required boilerplate
<Guest24881>
it's just that the structure is different and i need to learn it intuitively
<Guest24881>
whatever, im about ready to drop this course because I feel so behind
<weaksauce>
:(
<Guest24881>
well if it weren't for computing elements mobile app development and cryptography too
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<ruby-lang754>
Hi - I'm a beginner RoR developer and was hoping if someone could answer (I believe) a pretty easy question I just can't seem to get to the bottom of
<ruby-lang754>
yatish27: thanks for whatever help you can provide
<bnagy>
there's also #rubyonrails
<ruby-lang754>
thanks, will ask there as well... tried to logon earlier and was given issues getting access... but will try again
<ruby-lang754>
are you familiar with rails? am I wrong to assume some controller should be calling this script?
<ledestin>
ruby-lang754: it looks like the script should be run from cron
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<ruby-lang754>
so being called externally every x minutes or something... not necessarily when someone submits a story
<ruby-lang754>
what tells you its cron?
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<ledestin>
doesn’t matter if it’s cron
<ledestin>
beware of races though
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<ledestin>
like when first instance of script hasn’t finished working, and the second is up
<ruby-lang754>
okay
<ruby-lang754>
I can only hope people are submitting multiple in miliseconds
<ruby-lang754>
thanks, but I still am having trouble understanding what tells this script to run... I can't get it running on my version and am troubleshooting
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<morton>
how to write an OS in ruby
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<morton>
rubinius and mri both have ~65% ruby in github, the rest is c++ or c respectively, whats the difference then?
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<maloik>
Is there a concise way to turn [1, 2, 3] into {a: 1, b: 2, c: 3} ? As in, given a list of keys, let each key have a value of the next element in the array
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<apeiros_>
maloik: I don't understand in your explanation from where :a, :b, :c comes
<apeiros_>
maloik: do you have two arrays? keys and values?
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<maloik>
apeiros_: yep exactly
<maloik>
I guess I could use each with index to collect them, using the index to assign the correct key and value
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<apeiros_>
maloik: keys.zip(values).to_h
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<maloik>
oooooh
<maloik>
fancy :)
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<maloik>
how would you split one array into several based on a predicate? for example, given [1, 2, 4, 5, 6, 7, 9, 11, 12] I'd want to split it up when the jump from one element to the next is more than 1
<maloik>
(I'm coming up with the worst examples aren't I)
<maloik>
outcome would be [[1,2], [4,5,6,7], [9], [11,12]] here
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<ledestin>
maloik: I just recently read about some new spliting methods in 2.2 or something
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<maloik>
I'm not sure yet if this will be run on 2.2 so I prefer not to use anything new
<ledestin>
Enumerable#slice_when
<ledestin>
that’s really cool
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<maloik>
any other ideas?
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<apeiros_>
maloik: each_cons
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<maloik>
sweet, getting somewhere
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<lapide_viridi>
I've got a few raspberries hooked up as server, but sometimes, one seems to crash. Is it possible to use ruby from another pi, which pings the other servers and then sends a mail if one or several don't respond?
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<darix>
lapide_viridi: sensu, icinga
<darix>
come to mind
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<lapide_viridi>
Those check if the servers are on? I just have to ping them.
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<darix>
lapide_viridi: ping check is one of the basic checks they support yes
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<lapide_viridi>
Oh, I just wanted to know if I could ping with ruby, and then use to to send a mail.
<lapide_viridi>
Not sure what those are, to be frank. Libraries or stand alone programs?
<womble>
rod_: It's because `key=word` simply makes `key` point to the same place as `word` -- Ruby is all pass-by-reference, not pass-by-value. You want `key=word.dup` instead -- that makes a copy of `word` (the `.dup` call) and then assigns that to `key`.
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<rod_>
ahhhhh!
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<rod_>
let me try...
<rod_>
makes sense
<womble>
lapide_viridi: You can call external programs with Ruby; for the ping, you can just run system("ping -c 5 #{target}") and then check $?.exitstatus to see if it succeeded or failed. For the mail, you'll wait to use Net::SMTP, or any one of the many, many e-mail sending gems out there (I last used pony, but I'm sure there's something newer and hawter out there by now)
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<lapide_viridi>
womble, oh, thanks! That is nice! I'll copy it for future reference
<lapide_viridi>
womble, can any device send a mail, or does it have to use a domain name?
<lapide_viridi>
Last time I checked, it was also not necessary to use a from address.
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<womble>
lapide_viridi: That's up to whatever you're sending the mail *to* -- some mail servers require a valid reverse DNS record on the sending IP, others don't care so much. And yes, sometimes From: addresses are checked, and other mail servers don't need it.
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<lapide_viridi>
That could be a problem then, because I don't have a domain name.
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<womble>
lapide_viridi: You can set the From: address to any "real" address and it'll (probably) work.
<lapide_viridi>
Ah, so I can just use my gmail address then, and send it to my gmail address.
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<womble>
You could also make the Pis act like mail clients, and send their e-mail via a "tame" mail server by logging in (the same as you would configure it if you were setting up the mail client on your computer or phone)
<fp->
hey everybody
<womble>
lapide_viridi: Putting your gmail address in the From: won't work; Google have their systems setup to reject mail like that, to prevent spammers.
<fp->
I'm hoping someone here may have a little better experience with what I'm hoping to accomplish and can point me in the right direction
<lapide_viridi>
That I could do. I have some addresses lying around, or I make a new one.
<fp->
basically, we've got several servers used for shared hosting of customer websites. I'm wanting to put a cron/daemon on each server that waits for a job to install WordPress into a user directory. Our centrally-hosted software would need to send the job to the server the user lives on, and the cron/daemon would pick up the job and install WP. Afterwards, the central software
<fp->
gets some kind of indication that the job is done and redirects the user to their new installation
<jbae>
hey all
<jbae>
does anybody know if there are any rooms for rubyists in ny ?
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<fp->
I'm just wondering if there's already a good framework/job-based system I can extend to install WP instead of reinventing most of that work
<womble>
fp-: That's pretty straightforward. There are no shortage of job queues out there. I prefer resque myself.
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<womble>
Lots of people appear to have a thing for sidekiq, although I don't know what it's benefits are.
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<fp->
ok so you'd do this pure ruby on the server side using redis
<fp->
rather than a simple cronjob and shell script
<womble>
If Redis isn't your thing, there's a variety of other systems out there that use RabbitMQ, or even a database like MySQL to store the jobs.
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<womble>
fp-: I'd do it using resque, yeah; for me, cron isn't frequent enough for those sorts of jobs.
<fp->
womble: I'm basically trying to do this fairly lean so there's not a lot of potential for breakdowns, especially since this is something installed on each customer hosting server and not centrally hosted with the app
<womble>
Also, you'd still need somewhere to *store* the jobs while you're waiting for the cronjob to fire, so you wouldn't save much code and infrastructure anyway.
<fp->
gotcha
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<womble>
fp-: A resque worker on each machine isn't going to consume many resources, and a (tiny) Redis server somewhere isn't going to be noticable.
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<fp->
i guess the other concern i have having those individual customer servers storing passwords to the central job queue
<fp->
that's why I was thinking each server would be running redis
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<fp->
and the central app would push jobs to each server
<nofxx>
works fine for me, but honest can't remember why I changed to sidekiq from resque. Something about speed with short running processes comes to mind
<womble>
fp-: The passwords don't have to go into the jobs. If you've got them stored securely somewhere else, the job worker can just pull that info out of a database.
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<womble>
fp-: Alternately, you could send the passwords pre-hashed in the job data; have them hashed in whatever way they'll be stored in the DB -- that way you're never handling plaintext.
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<womble>
nofxx: Running on EC2? Otherwise, I'd expect the overhead of a fork to be pretty hard-to-notice against the overhead of Ruby itself.
<fp->
womble: that makes sense on how to get passwords to the job, but what I'm talking about is how the job accesses its data
<fp->
womble: meaning, the password to connect to the redis server/mysql server to lookup the install info
<womble>
fp-: That's just a credential you protect like any other. No shortage of those in the average hosting environment, so presumably you've already got that problem licked.
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<fp->
right, we just usually don't have all servers communicating with each other
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<womble>
Welcome to the Brave New World of semi-intelligent infrastructure... <grin>
<fp->
i'm starting to think of just having the central app server run resque and have it connect to the individual customer's account, upload WordPress, edit the wp-config file, etc.
<womble>
That could work too.
<womble>
Although that would mean that the central app server would need every customer's plaintext-equivalent credential... making it a *very* tasty target.
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<fp->
right, we don't store that info, but could prompt the user for their password before connecting
<fp->
hand it off to the job
<fp->
yeah I suppose that's what I'll do
<fp->
at least then its' all central
<fp->
and rails has that new nifty ActiveJob framework I've been wanting to try out
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<womble>
What a coincidence! I like turtles *too*!