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<mbff>
Hello! I am have created a migration that creates a table. How can I prevent changes to the primary key and the timestamp columns? Surely it is typical to have "normal" columns and columns that are readonly/for the purpose of the db
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<aupadhye>
=-\
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<Swervz>
Hi please could someone help me getting this project working https://github.com/nikhgupta/scrapix I have never used ruby before so im not sure where to start.
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<TheCubeLord>
Swervz: Have You Used or Have Any Books
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<janmejay>
i want to read html in my rails app wich i upload there . how can we do that?
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<janmejay>
i want to read html in my rails app wich i upload there . how can we do that?
<janmejay>
is there anyone?
<Nilium>
You should probably ask in the #rubyonrails channel.
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<janmejay>
Nilium: that channel needs resitererd user
<Nilium>
So do that.
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<tref>
is there a way to alias the ruby ** exponent operator?
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<Ox0dea>
tref: Could you clarify?
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<tref>
Yeah, one sec I’ll post
<tref>
what’s the web app where you can post and run ruby code? I paired with someone on it yesterday
<Ox0dea>
tref: I'm not sure I understand how you figure aliasing is the fix?
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<tref>
Ox0dea: since * is iterating before ** its taking expressions like “4**3” and splitting them to [“4”, “”, “3”] instead of [“4”, “3”]
<tref>
Ox0dea: if you trace through the code you’ll see
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<Ox0dea>
tref: Got that. How does aliasing come into the picture?
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<tref>
so if something like Fixnum#_ was used instead of Fixnum#** there wouldnt be that collision
<tref>
Ox0dea: ^
<Ox0dea>
tref: Better than replacing "**" with something arbitrary to avoid the collision would be to properly parse the input.
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<tref>
Ox0dea: could you be more specifi
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<Ox0dea>
tref: If you want an immediate "fix" to the problem you've run into, #split can be passed a regular expression, and there are plenty of ways to match "*" without inadvertently matching "**" as well.
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<Ox0dea>
tref: An RPN calculator is practically a one-liner in Ruby. It's possible to evaluate infix directly, but you essentially end up maintaining your own stack anyway. Converting to RPN and evaluating that is more joy.
<tref>
I’ll look into that then
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<Ox0dea>
tref: For reference, then, #** is a method and can be aliased like any other.
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<tref>
Ox0dea: can you provide an example of that? I tried to alias it to underscore but it didnt work
<Ox0dea>
>> class Fixnum; alias pow **; end; 4.pow 3 # tref
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<Ox0dea>
tref: Just so you know, postfix notation is so simple that you can write an RPN calculator in Ruby without using any letters or numbers: https://eval.in/538462
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<tref>
Ox0dea: hold on I have to check this out
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<tref>
that’s pretty crypric
<tref>
cryptic*
<Ox0dea>
tref: Yes, I guess that was probably intended.
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<tref>
Ox0dea: I stll have to get my expression into RPN
<Ox0dea>
It's pretty great that you can write Ruby even if all your alphabetical keys are dead.
<Ox0dea>
tref: Aye, shunting yard is a little more involved than an RPN calculator, but not by much.
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<tref>
Ox0dea: at this point im having a hard enough time with a regex that matches two asterix’s
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<Ox0dea>
tref: Using regular expressions is really not the right approach here.
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<Ox0dea>
I offered that as a bad solution because I trusted you to choose the good one. :x
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<tref>
Ox0dea: well Im stuck with the age-old dillema. I don’t think I’ll be able to comprehend and implement the RPN solution before my deadline
<tref>
of an hour ago lol
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<Disavowed>
Morning all. New to Ruby and struggling with Rspec. Could anyone tell me how to debug this: expected #<String:70108787048520> => "Test" got #<String:70108787048600> => "Test"
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<Ox0dea>
Disavowed: Use #eq.
<Disavowed>
0x0dea: Damnit! I had 'equal'! Thank you so much!
<Ox0dea>
Disavowed: Happy to help.
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<_lazarevsky>
howdy all
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<ujjain>
Can somebody help me fix this error? no implicit conversion of String into Integer" (using ==) (RSpec::Expectations::ExpectationNotMetError) - http://pastebin.com/7HR1ceYR
<ujjain>
Can somebody help me fix this error? no implicit conversion of String into Integer" (using ==) (RSpec::Expectations::ExpectationNotMetError) - Source: https://gist.github.com/ujjain/42ed3507e6c0465658e3
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<ujjain>
what is #{} in ruby?
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<_lazarevsky>
I need help parsing a string
<hightower2>
ujjain, way to interpolate within strings... e.g. puts "I have #{ number } tasks"
<_lazarevsky>
name = "com.app.NAMESPACE.costoptimizer.key";
<_lazarevsky>
the first one should return -> com.app.NAMESPACE.costoptimizer.key
<scepticulous>
ujjain: which line does the error origin from? the message mentions == , so maybe stage or livecycle_settings['livecycle_state'] is not a string ?
<_lazarevsky>
the second one should return -> com.app.NAMESPACE.llm.database.root
<_lazarevsky>
I have grep-ed my git project for com.app.NAMESPACE and got thousands of results
<_lazarevsky>
now I wanna remove all the noise and just keep the full package name
<_lazarevsky>
could someone please give me some pointers? I guess the heuristic should be:
<_lazarevsky>
1) find com.app.NAMESPACE and keep going until you reach a character which is different to a letter or a .
<_lazarevsky>
does that make sense?
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<_lazarevsky>
thanks
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<ujjain>
scepticulous , thanks, I replaced the array by [0] and [1] and it works now
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<kerp_>
Hi all, does anybody know if the ncursesw gem supports PADs? I was unable to find any resources on the topic...
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<shevy>
will ruby perserve
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<n1colas>
Hello
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<Bish>
n1colas: HELLO
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<myntcake>
has anyone here tried the launch school(previously Tealeaf academy) program? what do you guys think of it?
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<bigmyx>
hey folks, I am trying to use Chef's git resource as described here: https://docs.chef.io/resource_git.html, when I try to pass a hash to environment method in the block like this : `environment { 'VAR' => 'whatever' }` - I got error: `syntax error, unexpected =>, expecting '}'`
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<adaedra>
try adding parenthesis.
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<adaedra>
{ } is considered as block parameter in this context.
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<bigmyx>
adaedra: what would be the correct syntax than?
<adaedra>
either `foo 'a' => 'b'`, either foo({'a' => 'b'})`
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<bigmyx>
adaedra: got it, thanks
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<nano->
drbrain: excellent, thanks!
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<shevy>
does anyone know if there is some direct link to that ruby contributor's convention or agreement? that thing that is new and I think not more than 3 months old or so
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<b|ackwolf>
how important enumerator is in Ruby world?
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<shevy>
b|ackwolf very, just look at what you can do with them
<shevy>
you have ... .each .each_with_index .inspect .next .size .with_object
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<b|ackwolf>
shevy, thanks. I'm reading "The Well-Grounded Rubyist" chapter 10 and I think I don't get the idea. should I continue to read or step back and read again?
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<x77686d>
Does anybody know the rationale behind String#each being removed in 1.9?
<darix>
x77686d: what do you want to do?
<darix>
x77686d: there is s.each_byte s.each_char s.each_codepoint s.each_line
<darix>
depending on what you want to do
<x77686d>
produce s[0], s[1], ...
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<darix>
well you want bytes? chars or codepoints?
<darix>
s.bytes[1] s.chars[1] s.codepoints[1]
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<x77686d>
I want whatever s[0], s[1], ..., produces, just like Array#each produces a[0], a[1], ... :)
<adaedra>
it says "character", so I guess you want each_char
<x77686d>
I understand the distinctions but it seems like removing String#each broke a reasonable behavior and I'm wanting to see what Matz' thinking was.
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<adaedra>
iirc, 1.9 added Unicode support, and in the same time distinction between the three categories above. #each may have feeled too ambiguous.
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<Ox0dea>
x77686d: String is not Enumerable.
<shevy>
b|ackwolf I don't know the chapter, more important than the chapter is that you can iterate through a collection thanks to enumerator
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<shevy>
damn unicode breaking old behaviour!
<Ox0dea>
x77686d: To clarify, the existence of String#each implies that, say, String#map should "do the right thing", but there's no clear definition thereof.
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<adaedra>
shevy: damn unicode fixing bad behavior!
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<Ox0dea>
b|ackwolf: I'd strongly advise against proceeding until you've got the general idea.
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* pipework
salutes General Idea
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<b|ackwolf>
Ox0dea, thanks for your mention.
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<Ox0dea>
b|ackwolf: Enumerators give you external iteration (arbitrary control of the loop with something more versatile than an index) and "internal construction", to put it to a phrase. Array on steroids, give or take.
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<Ox0dea>
Lazy and infinite sequences as well, because Ruby is secretly a functional programming language. :P
<shevy>
such pretty words ... Array on steroids :D
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<yuung>
i have a string and an array of words i'd like to replace within that string. does ruby have a method for this or am i going to have to iterate over the array?
<yuung>
for ex, `"this is my string", ["is", "string"] should be replaced ["IS", "STRING"] respectively
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<halfamind1>
Puma question: I'm running with 2 workers and my config includes `directory` and `prune_bundler` entries. Occasionally, I see an old worker process stick around after a deploy. Output of `ps axjf` looks like: https://gist.github.com/joeyAghion/f7c65ad7b528531f03f7
<shevy>
pumas run faster than humans but as long as you runf aster than your two co-workers, you should be safe
<eam>
0xffff88007ad4bf38
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<halfamind1>
Lol thanks shevy. But seriously, I'm stumped.
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<hanmac>
shevy, but humans are better to run in curves, pumas can't keep up with that ,P
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<eam>
we don't even know if humans *can* run in curves, since it's still undecided whether the universe is discrete or continuous
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<workmad3>
eam: we're better at running in either curves, or discrete approximations of curves, depending on which statement is true at the finest resolution of reality
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<workmad3>
shevy: what happens if you're being chased by a pack of 3 pumas, and you only have 2 co-workers?
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<eam>
without some kind of evidence that reality exist I'm going to have to reject this whole train of thought
<eam>
non-circular evidence please
<workmad3>
eam: if reality doesn't exist, it's still interesting to examine what exactly it is that doesn't exist
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<workmad3>
eam: and why it doesn't exist in the specific way that is observed
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<grill>
how exactly do i set the initial value of an attr_reader :some_attr
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<workmad3>
grill: in the `initialize` method, just assign to `@some_attr`
<grill>
interesting
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<apeiros>
grill: note that all that attr_reader does is create a method for you
<grill>
yes
<grill>
i just wasn't sure where to set the value
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<apeiros>
i.e. it's not "attr_reader :some_attr" which has a value, but the corresponding ivar @some_attr
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<shevy>
halfamind1 did you try in the ruby on rails channel yet? usually the percentage of people using webserver-related things would be higher than on #ruby
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<shevy>
workmad3 cats are lazy, they'll settle for the first-to-go-down!
<shevy>
grill one day we may have attr* with question marks!
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<adgtl>
What's best way to write pmap in Ruby?
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<apeiros>
a) define best, b) what's pmap?
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<baweaver>
memory map of processes if they're talking unix
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<baweaver>
including looking at the source and trying to reimplement it from there.
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<adgtl>
baweaver: yes
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<baweaver>
what code do you have so far?
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<adgtl>
baweaver: i mean, pmap can be easily writen elixir or is there in clojure. Is there any standard implementation with Ruby and threads that's legit
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<baweaver>
Normally parallel and async in ruby is a bad idea. Very rarely done well
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<baweaver>
If you're getting to a point where you _need_ it then it's probably time to try one of those other languages.
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<theRealGent>
Hello. Could anyone recommend the best solution to quickly installing ruby so I can use jekyll? Preferably something that doesn't modify my cd command :)
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<shevy>
theRealGent: wget ftp://ftp.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.tar.xz; tar xf ruby*xz; cd ruby*2.3*; ./configure --prefix=/usr # or any other prefix like into the home dir as done by e. g. RVM
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<darix>
neilhwatson: use the packages that come with your distro?
<neilhwatson>
He said he wanted a newer version.
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<darix>
an ubuntu still with 1.9
<darix>
sounds old
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<neilhwatson>
Very, even debian stable is at 2+
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<darix>
new lts is coming next month
<darix>
if i recall correctly
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<shevy>
debian is the king of the snails! only beaten by centos
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<Dysp>
Hi guys. I am very much new to Ruby and trying to understand it. I can't see what I am doing wrong here, I hope someone will enlighten me. I'm using Shoes. https://gist.github.com/anonymous/5accc447006a07e31b0a
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<bronson>
shevy: "brewed with only 300 lines of Ruby code" dunno why he didn't just go for 100 lines, only take a few more semicolons.
<bronson>
how big was it after rubocop was done?
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<bronson>
omg, Shoes is still a thing? that's awesome!
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<Dysp>
Haha. Trying to create a program that can help me handle tedious data-analyzing
<bronson>
Dysp: no idea what's going wrong... Care to share a bit more?
<Dysp>
As of now we are just copy/pasting between excel sheets.
<Dysp>
I'm simply trying to make a button. When I press it I want it to read a file and post the content.
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<Dysp>
And I can actually get that to work if I just place it all inside the button code block. But, then to challenge myself a bit, I wanted to make it so that the button just loads the file and content; and another block would the post it. I get nothing. Not even errors :(
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<bronson>
so what code did you paste?
<Dysp>
Sorry?
<bronson>
your indentation is weird. you realize your click handler only has two lines of Ruby right?
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<Dysp>
Identation? Like how it looks?
<Dysp>
Im totally new to programming
<bronson>
like line 11 is indented, but I don't know why it would be.
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<bronson>
@b1.click could be rewritten like this: @b1.click { f = File.open("tester.txt", "r"); @text = f.read }
<Dysp>
What is the function of the semicolon there?
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<bronson>
also, fwiw, you can just do @text = File.read('tester.txt', 'r')
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<bronson>
the semicolon separates statements, like a newline
<bronson>
I just used it because pasting multiple lines on IRC is irritating
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<Dysp>
Sure it is. I'll remember that.
<bronson>
My point is that your indentation indicates that @b1.click's block is ~15 lines long, but your code shows it's only 2 lines long (lines 7 and 8)
<Dysp>
I guess is that it actually reads the file, but doesn't 'refresh' to actually paste the content. But I then don't know how to make it do that.
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<shevy>
bronson it was not much bigger... perhaps +60 lines or so, putting some methods onto more lines or those weird huge hash constants onto several lines
<shevy>
but some other errors were not corrected like wrong indent
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<shevy>
what gets me is how this guy could have used like 80 $variables
<bronson>
shevy: ha, time for some more rubocop rules. "error: more than four globals used in one file"
<shevy>
I can't tell whether he was deliberately trolling or not... because the weird thing is, his old code still works on ruby 2.x and current ruby-gtk bindings too