Questions about Ruby, dynamic, reflective, general-purpose object-oriented programming language that combines syntax inspired by Perl with Smalltalk-like features.

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0
votes
0answers
13 views

Run RSpec from within a ruby script while refreshing all ruby configs etc

I'm working with a very large project with tons of established tests that include some reasonably complicated environment setups and what not. I've recently run into a situation testing some ...
4
votes
1answer
208 views

Why don't Python and Ruby make a distinction between declaring and assigning a value to variables?

Two of the most popular dynamically typed scripting languages, Python and Ruby, do not make a distinction in syntax between the declaration of a variable and assignation of a value to it. That is in ...
25
votes
7answers
3k views

Explanation on how “Tell, Don't Ask” is considered good OO

This blogpost was posted on Hacker News with several upvotes. Coming from C++, most of these examples seem to go against what I've been taught. Such as example #2: Bad: def ...
4
votes
3answers
2k views

Ruby IDE code completion [closed]

I just started writing some ruby in my spare time and am currently using Netbeans 7 with the Ruby and Rails plugin v0.111. I'm primarily a Java programmer coming from IntelliJ and Eclipse. One ...
1
vote
2answers
104 views

In Ruby, change global in thread safe block

In Ruby, I have a use case for a few common configuration options, e.g. NOOP, TRACE, SILENT. Right now I am using local vars instead of globals and passing them around all over the place and it's a ...
20
votes
2answers
1k views

Do modern languages still use parser generators?

I was researching about the gcc compiler suite on wikipedia here, when this came up: GCC started out using LALR parsers generated with Bison, but gradually switched to hand-written ...
0
votes
0answers
32 views

Refactoring a Single Rails Model with large methods & long join queries trying to do everything

I have a working Ruby on Rails Model that I suspect is inefficient, hard to maintain, and full of unnecessary SQL join queries. I want to optimize and refactor this Model (Quiz.rb) to comply with ...
0
votes
1answer
44 views

How can I rank teams based off of head to head wins/losses

I'm trying to write an algorithm (specifically in Ruby) that will rank teams based on their record against each other. If a team A and team B have won the same amount of games against each other, then ...
2
votes
2answers
72 views

What kind of exception to ask for out of range arguments?

What type of exception should I throw? I have a console class which describes rectangle of cells which a user can index by passing in a coordinate: width, height = 80, 25 console = ...
0
votes
2answers
311 views

Why doesn't Ruby have implicit conversion of Fixnum into String?

Ruby normally makes things easy. However, it doesn't allow implicitely converting a number to a string: 2.0.0p247 :010 > "a"+1 TypeError: no implicit conversion of Fixnum into String Why is this ...
1
vote
2answers
223 views

Need advice on design in Ruby On Rails

For personal educational purposes I am making a site for a conference. One of the object that exist in a conference is a session, which has different states and in each state it has slightly different ...
4
votes
5answers
2k views

What is a practical way to debug Rails?

I get the impression that in practice, debuggers are rarely used for Rails applications. (Likewise for other Ruby apps, as well as Python.) We can compare this to the usual practice for Java or ...
0
votes
2answers
209 views

What happened to VM based deployments?

Watched some MountainWest RubyConf 2014 talks and noticed an interesting theme. Many dynamic programming environments back in the old days used to be self-contained VM images, e.g. SmallTalk, ...
26
votes
4answers
2k views

Concrete examples of Python's “only one way to do it” maxim

I am learning Python and am intrigued by the following point in PEP 20 The Zen of Python: There should be one-- and preferably only one --obvious way to do it. Although that way may not be ...
0
votes
1answer
51 views

Android -> Ruby Server Interface -> Mongodb

I've been wrecking my brain about this for a few days. I'll run my scenario by you and hopefully you can help me. In my head this is how it goes: I have an Android App. I want my Android App to make ...
4
votes
3answers
1k views

How can web development bootcamps deliver on their promise? [closed]

I came across the concept of web development bootcamps, these 9-10 week intensive crash courses claim to teach beginners web development and help them get 80k starting salary jobs. Many of you might ...
1
vote
1answer
150 views

Why many Ruby gems won't work on Windows [duplicate]

Most of the gems out there work fine on *nix but not on Windows. First I tried WySQL2, then dosu which shows incompatibility with Ruby 2.0. I tried things on github issues, but no luck. I never had ...
0
votes
0answers
11 views

Is Resque appropriate for an evented application?

As the title says, is Resque appropriate for an evented application that requires a decent amount of speed? I'm working on a server application that emulates the default Minecraft server, and I was ...
0
votes
0answers
57 views

Ruby on Rails Development: updating model attribute using f.association collection

Im currently working on a rails program. It contains many different databases but to keep things simple I have a people, student, and faculty table. A person can be a student or faculty member and ...
3
votes
1answer
74 views

What does it mean that file IO binary flag is only relevant on Windows

I was reading a question and one of the comments mentioned that "The binary flag is only relevant on Windows". Given the context of the question and answer, I interpret this statement as on ...
67
votes
9answers
28k views

Why is Python used for high-performance/scientific computing (but Ruby isn't)?

There's a quote from a PyCon 2011 talk that goes: At least in our shop (Argonne National Laboratory) we have three accepted languages for scientific computing. In this order they are C/C++, ...
6
votes
6answers
707 views

Is it okay to define a [] method in ruby's NilClass?

Ruby by default does not include the method [] for NilClass For example, to check if foo["bar"] exists when foo may be nil, I have to do: foo = something_that_may_or_may_not_return_nil if foo ...
0
votes
2answers
216 views

help me understand Rails and attributes as class methods

This is from the Hartl Rails tutorial. We are automatically logging in a user in the process of creating that user with a callback to #create_remember_token. It works great but there are some things, ...
-3
votes
1answer
153 views

Is there a purely technical term for 'monkey patching' [closed]

EDIT The original title of the question was Is there a non-derogatory term for 'monkey patching'. As I have learned that the term is actually not derogatory, or is at least not meant to be, I changed ...
0
votes
1answer
104 views

JSON - Ruby objects key naming

Ruby object has method/property: def tentakles_count 8 end JavaScript object has key/property: { justEnough: true } Now, when JavaScript gets serialised ruby object via XHR or WebSocket, ...
0
votes
0answers
54 views

Ruby on Rails - branding

I am working on a website, which is to have multiple brands. The core functionality for all brands will be the same, however there will be a number of differences between them. Those differences may ...
2
votes
4answers
218 views

Test Doubles, Mocks and Stubs - when not to use & why, for Ruby, Rspec

I've learned about mocking and stubbing and I've seen how they can help me create great test suites that run blindingly fast and thus speed up my development process hugely. However I've also seen ...
7
votes
3answers
933 views

Help understanding server-side scripting

As far as I understand, there are basically 3 options for doing server-side scripting these days: Using scripting languages that can be directly interpreted/executed by the web server (e.g., PHP and ...
2
votes
2answers
3k views

How to execute a Ruby file in Java, capable of calling functions from the Java program and receiving primitive-type results?

I do not fully understand what am I asking (lol!), well, in the sense of if it is even possible, that is. If it isn't, sorry. Suppose I have a Java program. It has a Main and a JavaCalculator class. ...
2
votes
2answers
111 views

How to check robustness in a service that includes multiple points of failure in workflow, including FTP

As part of my workflow, I need to do all these steps in one transaction - I need to ftp files to 2 different FTP servers. - There is also a spreadsheet that gets generated which needs to be FTP'ed. ...
1
vote
4answers
240 views

If I use Ruby Migrations, do I have to use the rest of Ruby on Rails?

I'm currently trying to come up with a database migrations strategy for my organization. This includes getting the database scripts into source control, managing versioning, managing releases to QA / ...
9
votes
3answers
379 views

Is Non-Deterministic Resource-Management a Leaky Abstraction?

From what I can see, there are two pervasive forms of resource-management: deterministic destruction and explicit. Examples of the former would be C++ destructors and smart pointers or Perl's DESTROY ...
-2
votes
1answer
2k views

Advantages and disadvantages of PHP/Ruby [closed]

I've been a front-end developer for about two years now, and I'm attempting to break into the server side of things. Ideally I'd like to work for a startup social network on the back-end side so I ...
32
votes
11answers
4k views

Is it okay to make coding style changes on an open source project that doesn't follow best practices?

Recently, I came across a number of open source Ruby (or majority of it was Ruby) projects on GitHub that when checked with a code analyzing tool like Rubocop, create a lot of offenses. Now, most of ...
2
votes
1answer
194 views

Designing and refactoring of payment logic [closed]

Im currently working on an application that helps users to coordinate dinner clubs and all related accounting. (A dinner club is where people in a group, take turns to cook for the rest and then you ...
1
vote
2answers
50 views

Auxiliary space complexity of map vs map!

I'm curious about the difference in space complexity between map and map! in ruby. If I have the methods: def mult_by_two(arr) arr.map {|i| i * 2 } end def mult_by_two!(arr) arr.map! {|i| i * 2 ...
2
votes
1answer
67 views

scoping concern when dealing with coupling

I'm learning ruby (and OOP in the process) and I find keep having to write the same patterns when logging progress so I want to wrap this up in a logging library that my other code can then just pass ...
0
votes
6answers
220 views

How do I explain a ruby method with a real-world analogy? [closed]

I am looking for a good analogy to help the concept of a method in ruby stick in my head. When I truly understand a concept, an image flashes in my mind that relates something physical to the abstract ...
1
vote
4answers
167 views

Efficient way of evaluating an array of strings then add to an array in Ruby

I am looking for an efficient way of evaluating an array of strings against a series of rules and then adding them to another array. For example I have an array of strings: something a 1234 #gohere ...
0
votes
0answers
262 views

Ruby module namespacing advice

in my current project have: module Stats class Site ... end class Product def initialize(product_id) @product_id = product_id end end class Profile ... end end ...
1
vote
1answer
177 views

Dealing with 'dirty' Ruby on Rails client

I had to leave a startup about a month ago because of lack of funding. Basically, this client wanted an application to allow contractors to create, update, read, and delete yardsigns. Straight forward ...
0
votes
1answer
251 views

ruby for desktop app or web app development [closed]

i am a beginner to ruby . i just did some minor research about why RUBY ? why choose RUBY ? whats new in it. Whenever i do type in a word RUBY in google search there comes a suggestion like RUBY on ...
18
votes
3answers
1k views

Why do so many languages treat numbers starting with 0 as octal?

I've read Where are octals useful? and it seems like octals are something that were once upon a time useful. Many languages treat numbers preceding with a 0 as octal, so the literal 010 is actually ...
2
votes
1answer
121 views

How to create html pages which don't change very much and not very often?

I have a Rails server that connects to a json API on another server to get data to build the pages dynamically. These pages, however, don't change very much and not very often. I was thinking I could ...
2
votes
3answers
432 views

Is the Observer pattern adequate for this kind of scenario?

I'm creating a simple game development framework with Ruby. There is a node system. A node is a game entity, and it has position. It can have children nodes (and one parent node). Children are always ...
1
vote
0answers
29 views

Should I refactor a F class from code climate? [duplicate]

According to code climate, a class is F, aka the worst mark you could be granted. I did submit a pull request to rearrange it here Which has been refused because the new code is supposedly too ...
2
votes
1answer
261 views

How do I test this?

I've attempted test first in Ruby on Rails using Test Unit and RSpec. I'm wondering how to do test first in situations that are more closely tied to the OS/filesystem. Problem: Building a USB stick ...
0
votes
1answer
131 views

Refactoring this code that produces a reverse-lookup hash from another hash

This code is based on the idea of a Form Object http://blog.codeclimate.com/blog/2012/10/17/7-ways-to-decompose-fat-activerecord-models/ (see #3 if unfamiliar with the concept). My actual code in ...
1
vote
1answer
74 views

Should I use the new method/action to retrieve records? (Rails)

I have an admin controller that is just used for its index action which renders a view with the most recent updates to certain resources: class AdminController < ApplicationController ...
-1
votes
2answers
163 views

Programming beginner: Options for small program interfaces? [closed]

I have been a Rails developer for a year now, and I really want to start diving in to Ruby and pure programming without using a framework. However I am having trouble conceptualizing little programs I ...