#ruby on 2019-12-06 — irc logs at freenode.irclog.whitequark.org

2019-11-23 18:05 havenwood changed the topic of #ruby to: Rules & more: https://ruby-community.com | Ruby 2.6.5, 2.5.7, 2.7.0-preview3: https://www.ruby-lang.org | Paste 4+ lines of text to https://dpaste.de/ and select Ruby as the language | Rails questions? Ask in #RubyOnRails | Books: https://goo.gl/wpGhoQ | Logs: https://irclog.whitequark.org/ruby | Can't talk? Register/identify with Nickserv first!

00:00 <g_w> Thanks Rudolph, I thought so.

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00:16 <l4cr0ss> why must I have a BASERUBY in order to compile ruby?

00:17 <l4cr0ss> to compile on trunk

00:19 <l4cr0ss> tarball'd releases work fine - what is it about the master branch that requires ruby to be installed ?

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03:48 <TzilTzal_> confused about something: in Ruby, are instance variable the same as class instance variables?

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04:12 <nofxx> TzilTzal, nope, did you grasp the class instance concept? Eigenclass

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04:16 <uplime> b 19

04:27 <greenhat> classes are instances of Class, and class instance variables are instance variables of that instance of Class. If I understand all that correctly.

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04:39 <nofxx> greenhat, yup... and instance are vars from that class objects (Class#new)

04:40 <nofxx> that class instantiated objects*

04:41 <greenhat> When I came to ruby from C# that melted my brain.

04:41 <greenhat> Now it just seems like the right thing to do.

04:45 <nofxx> greenhat, yeah I call it the least surprise that often surprises

04:45 <nofxx> in the good way heh

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05:05 <TzilTzal> So when I have:

05:05 <TzilTzal> class X

05:05 <TzilTzal> @i = 0

05:05 <TzilTzal> end

05:05 <TzilTzal> Is that an instance variable or a class instance variable?

05:06 <TzilTzal> My understanding is the former.

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05:10 <TzilTzal> actually, the latter, sorry.

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05:16 <greenhat> It is a class instance variable

05:17 <TzilTzal> So how do you distinguish between instance variables and class instance variables?

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05:19 <greenhat> https://dpaste.de/creK

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05:19 <greenhat> instance variables can only be defined within an instance method

05:20 <nofxx> TzilTzal, @@two_ats and that ^

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05:20 <TzilTzal> nofxx: @@ indicates class varialbes, no?

05:20 <TzilTzal> *variables

05:20 <nofxx> greenhat, actually that code is valid, but will be a bad practice

05:21 <greenhat> It is bad. I'm trying to show a civar is not accessible in an instance method

05:21 <nofxx> TzilTzal, yup, isn't that your question?

05:21 <nofxx> @@x vs @x

05:22 <TzilTzal> So the @name in def name isn't the same as the @name right after class MyClass?

05:22 <greenhat> Right

05:22 <TzilTzal> damn confusing.

05:23 <TzilTzal> :10

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05:23 <greenhat> If you are coming from java or similar where you declare instance variables within the class definition, you don't do that in ruby.

05:23 <TzilTzal> Yeah, I come from C++

05:23 <TzilTzal> mainly.

05:24 <greenhat> You don't need to "delcare" them. They just come into existance on first use in an instance method.

05:24 <nofxx> TzilTzal, yeah, because of that confusion its a bad practice

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05:25 <TzilTzal> greenhat: I get that.. but I thought they were referring to the same one @i

05:25 <TzilTzal> ... and apparently they don't )

05:25 <greenhat> Nope :)

05:25 <TzilTzal> also seems as thought self.name won't be inherited?

05:26 <TzilTzal> or rather: available in derived classes?

05:26 <greenhat> I've been doing ruby for at least 5 years, and I can count on one hand the number of times I've used a class instance variable.

05:26 <nofxx> TzilTzal, class Foo; attr_accessor :bar; @bar = 10; def self.bar; @bar end end

05:26 <nofxx> lot in play there, Foo.new.bar , Foo.bar

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05:28 <nofxx> TzilTzal, another way to think is that "class Foo" == "Foo = Class.new"

05:28 <nofxx> so, Foo as an instance has it's @bar, and each children as instances have their @bar

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05:34 <greenhat> You can consider all instance variables "private" in ruby. So while the `self.name` method is inherited, if you call Child.name you'll get nil.

05:34 <greenhat> Becuase the the @name class ivar in MyClass is not visible to the Child class.

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05:45 <TzilTzal> Where are class instance variables stored, exactly?

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05:46 <TzilTzal> in (the object) MyClass?

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05:51 <greenhat> Right

05:52 <TzilTzal> but not in instances of it, is that right?

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05:54 <greenhat> right

05:54 <greenhat> https://dpaste.de/zi4z

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05:59 <havenwood> TzilTzal: Another example: https://gist.github.com/havenwood/59a8920f6091a244c936

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06:00 <TzilTzal> greenhat: but you can't call top_speed on an instance of either Vehicle or Boat?

06:03 <greenhat> Right - they are class methods.

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06:05 <greenhat> class ivars are not used very often though.

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06:06 <greenhat> It helps to realize Vehicle and Boat are two seperate instances of a class, so they have their own instance variables.

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06:09 <TzilTzal> yes, it's just confusing though.

06:09 <TzilTzal> also, 'self' is always the dynamic type of the object?

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06:12 <greenhat> It is confusing when coming from a language where a class is not just an instance of an object, like C++, Java, etc.

06:13 <greenhat> That's where I came from and it took some time to sink in for sure.

06:13 <greenhat> https://dpaste.de/3OQz

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06:14 <havenwood> And you can have many instances of both Boat and Vehicle.

06:14 <greenhat> It all makes more intuitive sense when viewed from the standpoint of instance methods and istance variables, and not class methods and class ivars.

06:15 <greenhat> And then just think "Oh, Vehicle is not a special thing. It is just a constant that references an instance of a subclass of Class".

06:16 <havenwood> "Every Ruby object is the combination of a class pointer and an array of instance variables." - Pat Shaughnessy, Ruby Under a Microscope

06:18 <greenhat> Yes. TzilTzal: since you are coming from a C background that would be a great book to help you really grok ruby.

06:18 <havenwood> &>> name = 'TzilTzal'; name.instance_variable_set(:@letter, 'T'); class << name; attr_reader :letter end; name.letter

06:18 <rubydoc> # => "T" (https://carc.in/#/r/8595)

06:19 <TzilTzal> thanks for all your help.

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06:40 <havenwood> fwiw, a random assortment of examples showing defining a method and instance variables on an object: https://gist.github.com/havenwood/e459ca5ccde8375a781563649926ba33

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06:46 <jidar> meta-gk

06:47 <jidar> woops

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09:39 <Bish> is there a way to get the memory adress kinda like the normal inspect does?

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09:59 <al2o3-cr> Bish: Kernel#object_id

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10:00 <al2o3-cr> bit shift left by one

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10:07 <Bish> hm? is that really always the case?

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10:10 <Bish> weird, why?

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10:55 <Bish> i really don't like Net:SSH's design

10:55 <Bish> it's very convuluted

10:56 <Bish> and this weird having to call loop yourself has no benefits at all

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11:51 <ytti> 12:56 < Bish> and this weird having to call loop yourself has no benefits at all

11:52 <ytti> would you rather register events/hooks?

11:52 <ytti> like on_input?

11:52 <ytti> utility of the loop is that you have something in your stdout buffer, and it's not getting more, until you get back to the loop

11:52 <ytti> instead of being in this ambiguous state where more data may appear while you are processing it

11:53 <ytti> i may be confused but to me it seems reasonable

11:53 <ytti> or perhaps suffering from stockholm syndrome

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12:19 <Bish> ytti: oh i didn't know you're in here, i've been checking the last few days

12:20 <Bish> uhm, i don't know i think i don't like the general strucure, i keep forgetting what i am searching for while searching through your tree of functions (which goes somethimes up again)

12:20 <Bish> loop calls process, process checks busy, busy loops over all channels, which goes back to session

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12:21 <Bish> im trying to wrap Net:SSH into my own class right now.. and i locked the loop in a thread with a mutex

12:21 <Bish> like loop { MySession.synchronize { MySession.net_ssh_session.loop 1 } }

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12:22 <Bish> problem here is that the mutex is blocked for that whole second, and i can't see an easy way out there

12:22 <Bish> so the most approachable way i see here is writing my own eventloop, that handles multiple sessions that synchronizes calls to "MySessions"

12:23 <Bish> what i would've expected Net:SSH to do is .. to magicially handle it without having to f* with loop and such

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12:24 <Bish> Sequel for example (yeah im mentioning that alot) has some sort of "session" aswell and it has automatic pooling of connections and their threads, and you can always synchronize it if you extend it with function and it just works

12:25 <Bish> i admite that you can basicially get away without threads, though

12:25 <Bish> s/admite/admire

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13:36 <maasha> Can I dynamic define a module from a variable, i.e change Bar at runtime?: Foo::Bar.mymethod()

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13:37 <Bish> maasha: Bar is considered a constant

13:37 <Bish> but you can change the inside of bar as you like

13:37 <Bish> but i wouldn't redefine Bar

13:37 <maasha> Right

13:38 <Bish> ruby will warn if you do that, atleast

13:38 <maasha> So be it

13:39 <Bish> yeah then you can Foo::Bar = whatever

13:39 <Bish> but be aware there is a reason ruby doesn't like that

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14:27 <adam12> maasha: Depending on your use case, using the Forwardable module with __setobj__ can sometimes work well in this case too.

14:27 <maasha> adam12 I found a better solution using Method.call and no messing with constants

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15:14 <englosh> What is the most popular tool to distribute programs across multiple platforms? Without that the user has to install the Ruby interpreter

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15:15 <adam12> englosh: Not sure there's a perfect answer to this. Some people were using Travelling Ruby. There's motion in Artichoke Ruby to use WASM. And the Warbler tool from JRuby will build a jar.

15:16 <englosh> oh travelling ruby looks like a good one

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15:19 <adam12> englosh: If you look into Travelling Ruby, look for the fork. There's one maintained that has newer versions.

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15:19 <adam12> englosh: Actually, let me find the fork. I think I have a URL for it.

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15:21 <adam12> englosh: https://github.com/zw963/traveling-ruby Linux only tho.

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15:23 <englosh> thanks

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15:30 <xco> hi, i need help with this https://gist.github.com/xcobar/29eb20f4b147206c7118cf76b588f4e3

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15:32 <xco> no i don't, sorry

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15:44 <Inside> ok

15:45 <Inside> :)

15:45 <adam12> &>> "data:image/png;base64,iVBORw0KGgoAAAA..., data:image/png;base64,iVBORw0KGgoBBBB...".scan(%r{data:image/png;base64,\w+})

15:45 <rubydoc> # => ["data:image/png;base64,iVBORw0KGgoAAAA", "data:image/png;base64,iVBORw0KGgoBBBB"] (https://carc.in/#/r/85e1)

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15:46 <Inside> hrm?

15:48 <ytti> Bish, i've been traveling with only interim time to irc

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15:54 <Inside> welcome home

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15:56 <xco> hi i need help. how do i split a string like this https://gist.github.com/xcobar/29eb20f4b147206c7118cf76b588f4e3

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16:08 <Iambchop> xco: adam12 posted a suggestion using scan instead of split

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16:09 <xco> lambchop as a comment? i can't see it

16:09 <englosh> xco: you could maybe use a different terminator for every data string, instead of using a comma, e.g.: "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAASTOPdata:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA".split("STOP")

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16:11 <havenwood> xco: string.split(/,(?=data)/)

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16:22 <xco> havenwood hero! thanks

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16:23 <havenwood> xco: Oops, needs the colon: string.split(/,(?=data:)/)

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16:23 <xco> havenwood still works though :p

16:24 <havenwood> xco: Yeah, you could just hit a bug without the colon if the checksum happens to start with: data

16:24 <havenwood> xco: no prob, any time!

16:24 <xco> awesome, will add the :

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16:28 <Iambchop> xco: fyi adam12's post: ...scan(%r{data:image/png;base64,\w+})

16:29 <Iambchop> that wouldn't work as-is for non-png data

16:29 <xco> Iambchop thanks, i missed that somehow

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16:56 <NL3limin4t0r> adam12: Although your scan works it's not fool proof since base64 can also contain the "+", "/" and "=" (as padding) and can never contain "_". So I would change `\w+` to `[A-Za-z+/]*=*`

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16:57 <NL3limin4t0r> ^ That is should also contain `0-9` in the character class

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17:10 <adam12> I like havenwood's solution. I never realized String.split would accept a regexp with a group in it. Very fancy.

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17:29 <NL3limin4t0r> Agreed I would also go for `string.split(/,(?=data:)/)`

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17:43 <cxl> Hi, where can I find a list of built-in converters for the CSV class in plain Ruby?

17:43 <cxl> The doc for the CSV class is very terse on the matter

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17:53 <adam12> cxl: https://github.com/ruby/ruby/blob/dcf89b20d7b79b51e268ea3ffcfdc0829edf7643/lib/csv.rb#L328-L352

17:53 <adam12> cxl: Not sure that helps at all but that's where they are defined.

18:01 <cxl> adam12: yes thanks

18:01 <cxl> So it's funny: Date.parse('6 decembre') is fine, but Date.parse('6 décembre') is an invalid date

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18:03 <greenhat> Is there a cleaner way to create an array with 7 "blank" elements in the middle? ["id", ["blank"] * 7, "amount"].flatten

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18:12 <havenwood> &>> ["id", *["blank"] * 7, "amount"] # greenhat

18:12 <rubydoc> # => ["id", "blank", "blank", "blank", "blank", "blank", "blank", "blank", "amount"] (https://carc.in/#/r/85f4)

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18:13 <havenwood> &>> ["id", *Array.new(7, "blank"), "amount"]

18:13 <rubydoc> # => ["id", "blank", "blank", "blank", "blank", "blank", "blank", "blank", "amount"] (https://carc.in/#/r/85f8)

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18:14 <greenhat> Nice

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18:28 <jesfre> Hey everyone! Would anyone recommend resources to work through for Ruby and/or apprenticeship programs?

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18:33 <cxl> also, how would you turn this string: "1 200,00" to the float 1200.0? Using gsub is tricky because the same number could also be "1'200,00" or "1'200.00" or... depending on the user's locale

18:34 <cxl> some even write "1,200.00"

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18:42 <adam12> cxl: Simplest solution is just parse out everything that's not 0-9 or \.

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18:42 <adam12> s/parse/strip

18:43 <adam12> cxl: Actually, I just noticed the first example having a comma as a decimal separator. Interesting.

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19:59 <cxl> adam12: yeah that's French

20:00 <cxl> I ended up stripping "', .", converting to float, and then dividing by 100

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20:01 <havenwood> &>> Float("1 200,00".tr(' ,', '_.')) # cxl

20:01 <havenwood> &>> "1 200,00".tr(' ,', '_.').to_f

20:01 <rubydoc> # => 1200.0 (https://carc.in/#/r/85i4)

20:01 <havenwood> &>> Float("1 200,00".tr(' ,', '_.'))

20:01 <rubydoc> # => 1200.0 (https://carc.in/#/r/85i5)

20:01 <havenwood> Oops >.>

20:01 <havenwood> leading whitespace

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20:06 <havenwood> cxl: I'd suggest String#tr with a strict Float() converstion.

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20:23 <cxl> well it turns out that the " " thousands separator is [226, 128, 175] in bytes... What kind of a space is that?

20:25 <cxl> UTF-8 takes two bytes per char, right? But this one takes 3?

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20:47 <caduguedess> Boa tarde, pessoal.

20:47 <caduguedess> Estou tentando mexer em um projeto feito em ruby on rails, preciso recuperar as informacoes que estao em uma tabela chamada changesets

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20:48 <caduguedess> o commando "ActiveRecord::Base.connection.tables" mostra as tabelas disponiveis, e dentre elas esta a tabela changeset

20:48 <caduguedess> como eu faco pra consultar o conteúdo dessa tabela?

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20:52 <caduguedess> Preciso instalar uma gem pra isso ou o console tem algum comando que mostra o conteúdo da tabela?

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21:12 <cxl> caduguedess: yo'll have more luck in English, not sure how many (if any) of us speak... Portuguese?

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21:43 <bhaak> cxl: no, UTF-8 has variable sizes.

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21:46 <bhaak> cxl: [226, 128, 175].pack('C*').force_encoding('UTF-8').codepoints.first.to_s(16) -> 202f

21:46 <bhaak> https://www.fileformat.info/info/unicode/char/202f/index.htm

21:46 <bhaak> NARROW NO-BREAK SPACE

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22:05 <havenwood> &>> [226, 128, 175].pack('C*').unpack1('U*').to_s(16)

22:05 <rubydoc> # => "202f" (https://carc.in/#/r/85io)

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22:35 <havenwood> &>> [226, 128, 175].pack('C*').unpack('U*').pack('U')

22:35 <rubydoc> # => " " (https://carc.in/#/r/85j5)

22:35 <caduguedess> How could I retrieve data from a ruby on rails database in an efficient way ? My goal is to retrieve values from a table named "changesets".

22:35 <caduguedess> I need to get the number of changes of each user, and the table has the columns "num_changes" and "user_id".

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22:35 <caduguedess> There is a console command for it, or its better installing a gem for it?

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22:49 <havenwood> caduguedess: You can run `rails console` and then do a query.

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