Split a value and units in Ruby
What is the most elegant way to split a value and units, so you have: 13min.some_method["value"] = 13 13min.some_method["unit"] = "min" I think it should use unpack or split, but I can get it to work! ...
What is the most elegant way to split a value and units, so you have: 13min.some_method["value"] = 13 13min.some_method["unit"] = "min" I think it should use unpack or split, but I can get it to work! ...
I have a bunch of SQL statements to execute on a database. (I'm doing things that Rails doesn't provide methods for, as far as I know: creating views, adding foreign keys, etc. It's mostly for non-Rails interaction with the data.) In essence, I'm doing the following: sql = "statement_1; statement_2; statement_3; etc;" ActiveRecord::...
I'm just diving into ActiveRecord and have not been able to find an answer to my question. If I am updating an object's attributes and then calling save()... will ActiveRecord save to the DB ONLY when the new values are different from the old values? Let's say I do something like this: thing_to_update = Thing.find_or_create_by_code(so...
I have this object of class Array >> answers_to_problem => [#<Answer id: 807, problem_id: 1, player_id: 53, code: "function y = times2(x )\r\n y = 2*x;\r\nend", message: nil, score: 12, output: nil, hide: nil, create d_at: "2010-02-02 11:06:49", updated_at: "2010-02-02 11:06:49", correct_answer: nil, leader: nil, success: true, clo...
I'm having trouble making assert_raise recognize java exceptions. I can do assert_raise(NativeException) { @iter.next } which works fine, but if I try to get more specific java_import 'java.util.NoSuchElementException' #... assert_raise(NoSuchElementException) { @iter.next } I get the error Should expect a class of exception, Ja...
I'm looking to write a method that creates an array of a fixed length (in my case 12) from any array it is provided of arbitrary length (though the length will always be 12 or less) by repeating the objects in order. So for example given the array a: a = [1, 2, 3, 4] I would want to have returned: a = [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, ...
From a cursory glance, they appear to be simply two different approaches to the same set of problems, except that named scopes are chainable, while association extensions are not. Can anyone explain further, or provide an example that would be more appropriate for an association extension than a named scope? ...
I've got this going: def split_array(array,size) index = 0 results = [] if size > 0 while index <= array.size res = array[index,size] results << res if res.size != 0 index += size end end return results end If I run it on [1,2,3,4,5,6] like split_array([1,2,3,4,5,...
Is there a book about RoR for someone that has little or no understanding of Ruby? Although RoR is a great reason to start learning Ruby, I'd be bored out of my pants if I first have to read a full book on Ruby and then a book about RoR. Something that demonstrates the basic principles of both Ruby and RoR would be an ideal intro to th...
I could use a little help trouble shooting this problem. When using the app to create a new record nothing is being saved to the database. There are no visible errors presented. Dropping to the command line, and using the console with the same production environment, I can create a new object and save it (I have to bypass validations)....
I'm working on a Rails application that's kind of like a blog. Users create Entries. I'm trying to work out how to handle time storage and display. I've read this writeup about Rails timezone support. It's great but it doesn't cover what my app needs to do. It only looks at cases where you want to convert stored time to the current logg...
I'm not sure how to use regular expressions in a function so that I could grab all the words in a sentence starting with a particular letter. I know that I can do: word =~ /^#{letter}/ to check if the word starts with the letter, but how do I go from word to word. Do I need to convert the string to an array and then iterate through...
how to Handle version conflict when multiple concurrent editor on the same model rails? for example user A click edit on the post controller and start editing the content user B click edit on the post controller and start editing the title user B is done and click save user A is done and click save and override the modifications done by...
I've got quite a strange problem. I've installed ImageMagick via homebrew. I've installed rmagick-2.12.2 and rmagick-2.11.2 with no issues. I get no errors on installation of either. ImageMagick seems to be installed and in my path: $ convert --version Version: ImageMagick 6.5.6-5 2010-01-30 Q16 OpenMP http://www.imagemagick.org Cop...
I created a form with scaffold that includes two datetime fields. I replaced them with a datepicker, and now I'm trying to grab the date from within the controller. Instead of having ruby do all the magic work with the datefields, I instead just have to fields, start_date and stop_date that I want to use, but I can't figure out how to g...
I want to install Ruby SVM. I already have macports with normal settings, and installed libsvm via port just fine. But when I go to compile rubysvm, it barfs. :( Ruby SVM: http://rubysvm.cilibrar.com/download/ (most links are 404 though) libsvm: http://www.csie.ntu.edu.tw/~cjlin/libsvm/ Try this: sudo port install libsvm wget http://d...
While using gets to accept user input, pressing the arrow keys outputs text to the screen, presumably the character codes. How can I prevent this from happening, and further how can I get the arrow keys to properly move the cursor around? irb(main):001:0> foo = gets ^[[A^[[D^[[B^[[C => "\e[A\e[D\e[B\e[C\n" Edit: maybe I should men...
I have a custom finder defined below: class ContainerGateIn << ActiveRecord::Base ... def self.search(text) result = if text text.split(' ').inject(self) do |result, criteria| case criteria when /^[0-9]{4}-[0-9]{2}-[0-9]{2}$/ result.search_by_date(criteria.to_date) else r...
Does the fact that Rails have an MVC approach mean that is has dependency injection? Or is there a reason that we don't talk about dependency injection in Rails? If Rails does have dependency injection, what does it consist of? ...
Hi, I've recently started programming in Ruby, and I am looking at exception handling. I was wondering if ensure was like finally in c#. So if I have the following: file = File.open("myFile.txt", "w") begin file << "#{content} \n" rescue #handle the error here ensure file.close unless file.nil? end or should I do this? #store the ...