Ruby is a dynamic, open source programming language with a focus on simplicity and productivity.
0
votes
0answers
8 views
How do you have threads in Ruby send strings back to a parent thread [migrated]
I want to be able to call a method that repeats x amount of times on a separate thread that sends messages such as "still running" every few moments to the console while I am free to call other ...
2
votes
1answer
49 views
General case of the 24-challenge problem
I'm working on an algorithm to solve the 24-challenge game. The basic idea is to combine positive integers using arithmetic operators to produce an expression that evaluates to exactly 24. For ...
0
votes
1answer
32 views
Suggestions for Ruby string parsing
I need to add quotes to each word in a string. Here is something that works but it looks ugly to me;
"this is a test".split.to_s.delete("[],")
produces
"\"this\" \"is\" \"a\" \"test\""
split ...
-2
votes
0answers
34 views
user has_role? please help me to review my code [closed]
this is the user model code:
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and ...
0
votes
1answer
53 views
Math Calculus in ruby
I have several calculus to do in my ruby app.
My code is currently working but I find it very ugly.
@guestreviews = GuestReview.where(:reviewed_id => @user.id)
@hostreviews = ...
1
vote
3answers
80 views
Optimizing sum_combination_for(n) code
I'm working on a piece of code for calculating all the possible combinations of numbers that sum to n. For example:
sum_combination(3) = [
[1,1,1],
[1,2],
[3]
]
So my ruby code is this:
...
1
vote
1answer
42 views
Rails: Setting a transient attribute on a set of objects from one model based on information from a junction model
I have a user model, a task model, and a junction model user_task that saves the data joining the two:
class Task < ActiveRecord::Base
attr_accessor :completed_on
has_many :user_tasks
class ...
3
votes
1answer
122 views
Nasty Age Printing Method
I have this ugly age printing method. Can you do better?
def age(birth_date)
today = Date.today
years = today.year - birth_date.year
months = today.month - birth_date.month
(months -1) if ...
3
votes
2answers
48 views
Preventing Division by Zero
numerator: Value being divided.
denominator: Divisor value.
method so far:
def calc_percentage(numerator, denominator)
((numerator/ (denominator.to_f.nonzero? || 1 )) * 100)
end
What are the ...
1
vote
4answers
58 views
can this rails code be simplified and be more efficient? nested if else statements
Here's a part of my controller and it's getting quite lengthy (the code works).
Would this code slow down the performance of my website? Can it be cleaned up and be written more efficiently?
def ...
1
vote
3answers
84 views
How to flatten the nested for loops?
The problem I am facing is:
I need to interate through a bunch of lists, and there are separated conditions which needs to be satisfied by the list. conditons are not independent.
I care about the ...
1
vote
1answer
80 views
Optimizing code for project-euler p#23
I'm working on project euler's problem #23, wich is
Find the sum of all the positive integers which cannot be written as the sum of two abundant numbers
So I came up with this algorithm. Find ...
-1
votes
0answers
26 views
sprintf to convert floating number to integer in ruby [closed]
I was trying to convert a result to integer using the following expression
sprintf "%d", (3+ Math.sqrt(5))**28)
which gives result as 135565048129406451712
but expected result is ...
4
votes
1answer
117 views
Refactor a sequence of functions
I have an http library in Ruby with a Response class, I have broken it down into smaller methods to avoid having a big intialize method, but then I end up with this:
def initialize(res)
@res = ...
0
votes
0answers
37 views
A Ruby file-find strategy with the Find library?
I recently wrote a bit of code to fix broken aliases. (A dropbox backup changed all their types to look like true files)
I iterate through all files in O(m•n) form. I recognize that there are ...
1
vote
2answers
100 views
Splitting a range into min and max?
I needed to get the minimum and maximum date values from a query using the Sequel ORM in Ruby from my database. Sequel has a range method that returns a Range value. I'm having it return values from a ...
2
votes
3answers
69 views
I need help refactoring some Rails code that looks clunky.
I would like to refactor this block, it looks clunky:
# refactor me
receive_payment_on = false
config[:sections].each do |section|
if section[:applicants]
section[:applicants][:sections].each ...
1
vote
4answers
104 views
How can I refactor these while and unless loops to be DRYer?
I have a pack of cards and I am doing a 'deal' action.
I am dealing n number of cards, for now to one player.
How can I dry up the while and unless loops to be fewer lines?
def ...
1
vote
1answer
79 views
Three pitchers with water problem?
I don't know what this problem is named, so i can't Google for a solution about it. Here's the image:
There are three pitchers with capacities of 10, 7 and 3 quarts.
We need to move the water from ...
1
vote
1answer
36 views
Refactor making a tree with hash input?
I initialized a tree using a nested hash as input, but when I recursively call Tree.new on the children, it doesn't seem to pass each child as a hash. As a pretty ugly, but working, alternative, I ...
2
votes
1answer
53 views
two or more render/redirect in the same method
I often have method like this one with two or more render to do due to catching the error for example.
I currently do something like this:
def update
@user = current_user
if ...
2
votes
1answer
93 views
Leap year algorithm?
I wrote two functions for determining leap years.
("Kabisat" means "leap year" in Indonesia.)
def kabisat? y
return false if y%4!=0
return true if y%100!=0
y%400==0
end
...
1
vote
4answers
142 views
Double conditional : Cleaner way to write a set of conditionals
Is there a cleaner way to write:
def b_fname
if mdes_version_is_after?(3.0)
result = c_fname
else
result = response_for("#{birth_baby_name_prefix}.BABY_FNAME")
end
if ...
0
votes
0answers
54 views
Mixin both instance and class methods in Ruby
I have a Ruby class into which I want to include both class and instance methods. Following the pattern described in "Ruby Pattern: Extend through Include", I'm currently using the following:
class ...
3
votes
2answers
98 views
How would one more elegantly parse data from XML using Ruby and Nokogiri?
I have a method that parses XML into an array of hashes.
Here is the original XML:
<rowset name="skillqueue" key="queuePosition" ...
2
votes
1answer
46 views
Rails helper method refactor
I have this messy helper method:
def gesture(klass, item, text, desc)
element_class = klass.to_s + " gesture"
content_tag :li do
if klass == :sell
link_to new_reply_path(item_id: ...
4
votes
2answers
64 views
Refactor Ruby method for getting domain?
How do I make this more Ruby like? I want to return the host, for example
if the URL is "http://www.facebook.com" then I want to get 'facebook.com'.
Any other sub-domains without 'www' should give ...
0
votes
1answer
32 views
What is the best way to format a large has_many through line?
This question is about code style.
I have this line in one of my models:
has_many :owning_artists, :through => :artist_tracks, :source => :artist, :conditions => { :artist_tracks => { ...
2
votes
1answer
40 views
Refactor Ruby ActiveRecord importing library
In my Rails app I need to import some files from CSV and Excel files. I needed it in 2 models so I have written lib/importable.rb:
module Importable
def self.included(base)
base.send :extend, ...
3
votes
1answer
91 views
code optimization in ruby
I'm trying to solve the four color theorem in ruby.
A map is like this:
ccaaaa
baaadc
babcdc
bbbcdc
abcccc
And so far i have this following code but it's slow, how could I make it better ?
...
2
votes
1answer
47 views
Ruby persistent file open best practice
I have a method opening and appending to a file as so:
def writeFile(ofile,number)
File.open(ofile, 'a') { |file| file.puts(number) }
end
Which is called after line processing by another method.
...
1
vote
1answer
87 views
How can I make this code DRY and KISS in my model?
class Rating < ActiveRecord::Base
attr_accessible :item_type, :item_id, :rating, :voters_up, :voters_down
serialize :voters_up, Hash
serialize :voters_down, Hash
belongs_to :ranks, ...
3
votes
2answers
80 views
How can I make this code DRY in my controller?
What is the best way to DRY this code up?
class NotificationsController < ApplicationController
before_filter :load_user
def unsubscribe
if @facebook_admin && ...
3
votes
2answers
63 views
Review of OOP in Ruby class
Could you please review the following class products?
It should tell me whether the product is taxable or imported. Name should indicate if the product is imported or certain keywords should tell ...
0
votes
1answer
137 views
Why did I fail this Ruby developer test? [closed]
I took this developer test for a potential employer, and they said I failed because of my response to the first question. But Rails for Zombies seemed to imply that that's how you assign data to ...
3
votes
2answers
106 views
An abundance of ternary operators
I'd like to find a way to do what this method does in a cleaner, less hacky looking way
def self.create_from_person!(person)
spi = new(:person => person, :provider => person.provider)
...
3
votes
2answers
120 views
Help in refactoring this method - Ruby
def divisible?(n)
if n % 1 == 0 &&
n % 2 == 0 &&
n % 3 == 0 &&
n % 4 == 0 &&
n % 5 == 0 &&
n % 6 == 0 &&
n % 7 == 0 &&
...
2
votes
1answer
22 views
How to refactor that content_tag adding method?
How to get rid of that duplicaiton in if conditional?
def set_caption(result)
if result.respond_to?(:app_name)
content_tag(:div, result.type_name, class: 'type-name') +
content_tag(:div, ...
3
votes
3answers
96 views
Most efficient way to iterate through arrays/can I use .times method in place of while method?
I created a quick program to test the precision of randomness generated by the .rand method. The primary question is whether I can use the .times method in place of the while code blocks to increase ...
1
vote
1answer
52 views
Updating / validating mass update rails association
My recipes model is as follows
has_many :quantities
has_many :ingredients, :through => :quantities, :uniq => true
has_many :sizes, :through => :quantities, :uniq => true
And the ...
3
votes
3answers
86 views
Best way to include image_tag inside link_to
What is the most elegant and readable way to in include (potentially long) image_tag calls inside of link_to?
Example
<%= link_to image_tag('buckminsterfullerene.png', width: '210', height: '60', ...
0
votes
0answers
46 views
Is this a good, cross-platform way of spawning processes in Ruby 1.9?
Below is a function I am using to spawn subprocesses in a cross-platform manner on Ruby 1.9 with optional timeout support.
It works well most of the time. However I am experiencing a weird issue ...
0
votes
3answers
96 views
How do I generate a list of n unique random numbers in Ruby?
I am trying to create a randomly generated array of x numbers with no duplicates. I am choosing numbers, one at a time, then comparing each new number to the numbers already in the array.
Here is my ...
1
vote
2answers
118 views
Ruby implementation of Conway's Game of Life
I'm just starting with Ruby and decided to do two different implementations of Conway's Game of Life. In this first one I'm not using cells as a separate class and instead just track everything as a ...
2
votes
2answers
95 views
Placement of success code in a conditional
I'm not sure if there's a standard view where the placement of a success result should be in a conditional that can return multiple statuses. The success condition of this function is in the middle of ...
2
votes
2answers
101 views
What's the most readable way to write this line of Ruby code?
What is the most readable way to write this in Ruby?
if (not url.blank?) and (not url.include?('*'))
-1
votes
1answer
69 views
How to create 3 objects using one form only if each one is valid? [closed]
I want to create Job, Employer and Company using one form.
Model
class Job < ActiveRecord::Base
accepts_nested_attributes_for :company, :employer
belongs_to :company
belongs_to :employer
...
4
votes
1answer
105 views
Refactor ruby each-code
def users_list
html = ''
self.users.each do |user|
html << user.link_avatar_tag
end
html.html_safe
end
I feel that it is possible to write shorter.
Is it possible ...
1
vote
3answers
60 views
Dynamic variables in loop
I have this working code. I think this must be easier with a while loop.
if not c.e1.nil?
extrapreis = number_to_currency Extra.find(c.e1).aufschlag, :unit=>"EUR "
array.push ...
1
vote
2answers
120 views
iterate over an array and delete elements conditionally
The following logic:
Iterate over the URLs array and If the HTTP request with the given URL does not timeout, continue. If the URL times out, remove it from the array and continue with the next one ...
