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  • Ruby Module Inclusion in Methods

    - by Federico Builes
    In class Foo I'd like to include method Bar under certain conditions: module Bar def some_method "orly" end end class Foo def initialize(some_condition) if !some_condition "bar" else class << self; include Bar; end end end end Is there any cleaner (and clearer) way to achieve the include in the method without having to do it inside the singleton class?

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  • how to implement ajax in Ruby on rails via jquery

    - by swaroopsm
    how do i pass few of my form field(s) values to a controller usnig ajax/jquery? For eg.: In php/jquery I do something like this: $("#test-btn".click(function(){ var name=$("#name").val(); var age=$("#age").val(); $.post("insert.php",{name: name,age: age}, function(data){ $("#respone").html(data).hide().fadeIn(500); }); }); //insert.php <?php //insert values to database! ?> how do i acheive a similar functionality in rails using ajax/jquery?

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  • Ruby method Array#<< not updating the array in hash

    - by Mladen Jablanovic
    Inspired by http://stackoverflow.com/questions/2552363/how-can-i-marshal-a-hash-with-arrays I wonder what's the reason that Array#<< won't work properly in the following code: h = Hash.new{Array.new} #=> {} h[0] #=> [] h[0] << 'a' #=> ["a"] h[0] #=> [] # why?! h[0] += ['a'] #=> ["a"] h[0] #=> ["a"] # as expected Does it have to do with the fact that << changes the array in-place, while Array#+ creates a new instance?

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  • Ruby CSV in Array

    - by mattrock
    I read a CSV file. This file looks like this 1.00 cm; 2.00cm ; 3.00 cm; ... ; 100 cm 2.00 cm; 4.00 cm; 6.00 cm; ... ; 100 cm 4.00 cm; 8.00 cm; 12.00 cm; ... ; 100cm 8.00 cm; 16.00 cm; 24.00 cm; ... ; 100cm I have already written the following code CSV.foreach("/Users/testUser/Entwicklung/coverrechner/CoverPaperDE.csv", col_sep: ';') do |row| puts row[0] end This produces the following output: 1.00 cm 2.00 cm 4.00 cm 8.00 cm Example: My matrix is constructed 1.1 1.2 1.3 1.4 2.1 2.2 2.3 2.4 3.1 3.2 3.3 3.4 4.1 4.2 4.3 4.4 I want the following output 1.1 2.1 3.1 4.1 1.2 2.2 3.2 4.2 ... 4.4 How does it work?

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  • Trouble with array of dictionaries, ruby

    - by user299450
    I am getting the following error. game.rb:46:in `play': undefined method `[]' for nil:NilClass (NoMethodError) from game.rb:45:in each' from game.rb:45:inplay' from game.rb:56 with this code, def play() currentTile = nil @tiles.each do |tile| if(tile['Name'] == 'Starting Square') currentTile = tile end puts("#{currentTile['Desciption']}") end end This is part of a text adventure game, I am playing with @tiles is an array of tiles that was read from a file. Each tile is a dictionary. Thanks for any help, I cant figure this out

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  • Ruby on Rails login using legacy user database

    - by ricsmania
    Hello, I have a Rails application that connects to a legacy database (Oracle) and displays some information from a particular user. Right now the user is passed as a URL parameter, but this has obvious security issues because users should only be able to see their own data. To solve that, I want to implement a user login, and I did some research and came across 2 components for that, restful_authentication and authlogic. The problem is that I need to use an existing user/password database instead of creating a new one, which is the common way to use those components. The password is encrypted by a custom Oracle package, but let's assume it is stored as plain text to make things simpler. I only need very basic functionality, which is login a user and keep them logged in forever until logout. No changes to the database will be made by this application, so there's no need for sign up, e-mail activation, reset password, etc. Can someone point me in the right direction on how to do that? Is any of those 2 components a good solution? If not, what would be recommended? Thanks!

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  • Ruby Regexp methods?

    - by fjs6
    Is there a gem/example_code that allows to work with regexps? I am not looking for what a regexp can do, but what can be done to a Regexp object. For example: r = Regexp.new(...) r.min_length => the minimum length of a matching string r = Regexp.new("car(less)?") r.min_length => 3 for the string "car" Thanks!

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  • Finding relative libraries when using symlinks to ruby executables

    - by dgtized
    Imagine you have an executable foo.rb, with libraries bar.rb layed out in the following manner: <root>/bin/foo.rb <root>/lib/bar.rb In the header of foo.rb you place the following require to bring in functionality in bar.rb: require File.dirname(__FILE__)+"../lib/bar.rb" This works fine so long as all calls to foo.rb are direct. If you put as say $HOME/project, and symlink foo.rb into $HOME/usr/bin, then __FILE__ resolves to $HOME/usr/bin/foo.rb, and is thus unable to locate bar.rb in relation to the dirname for foo.rb. I realize that packaging systems such as rubygems fix this by creating a namespace to search for the library, and that it is also possible to adjust the load_path using $: to include $HOME/project/lib, but it seems as if a more simple solution should exist. Has anyone had experience with this problem and found a useful solution or recipe?

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  • ruby request.query_string

    - by Small Wolf
    Hey ,Guys! I want to use the method request.query_string to send the key-value to the controller,how can i use in the sentences; =link_to 'excel' , reports_excel_path(:format => 'xls',:from => 'conversations') Thank you!

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  • ruby parametrized regular expression

    - by astropanic
    I have a string like "{some|words|are|here}" or "{another|set|of|words}" So in general the string consists of an opening curly bracket,words delimited by a pipe and a closing curly bracket. What is the most efficient way to get the selected word of that string ? I would like do something like this: @my_string = "{this|is|a|test|case}" @my_string.get_column(0) # => "this" @my_string.get_column(2) # => "is" @my_string.get_column(4) # => "case" What should the method get_column contain ?

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  • Sanitizing User Input with Ruby on Rails

    - by phreakre
    I'm writing a very simple CRUD app that takes user stories and stores them into a database so another fellow coder can organize them for a project we're both working on. However, I have come across a problem with sanitizing user input before it is saved into the database. I cannot call the sanitize() function from within the Story model to strip out all of the html/scripting. It requires me to do the following: def sanitize_inputs self.name = ActionController::Base.helpers.sanitize(self.name) unless self.name.nil? self.story = ActionController::Base.helpers.sanitize(self.story) unless self.story.nil? end I want to validate that the user input has been sanitized and I am unsure of two things: 1) When should the user input validation take place? Before the data is saved is pretty obvious, I think, however, should I be processing this stuff in the Controller, before validation, or some other non-obvious area before I validate that the user input has no scripting/html tags? 2) Writing a unit test for this model, how would I verify that the scripting/html is removed besides comparing "This is a malicious code example" to the sanitize(example) output? Thanks in advance.

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  • ruby on rails implement search with auto complete

    - by user429400
    I've implemented a search box that searches the "Illnesses" table and the "symptoms" table in my DB. Now I want to add auto-complete to the search box. I've created a new controller called "auto_complete_controller" which returns the auto complete data. I'm just not sure how to combine the search functionality and the auto complete functionality: I want the "index" action in my search controller to return the search results, and the "index" action in my auto_complete controller to return the auto_complete data. Please guide me how to fix my html syntax and what to write in the js.coffee file. I'm using rails 3.x with the jquery UI for auto-complete, I prefer a server side solution, and this is my current code: main_page/index.html.erb: <p> <b>Syptoms / Illnesses</b> <%= form_tag search_path, :method => 'get' do %> <p> <%= text_field_tag :search, params[:search] %> <br/> <%= submit_tag "Search", :name => nil %> </p> <% end %> </p> auto_complete_controller.rb: class AutoCompleteController < ApplicationController def index @results = Illness.order(:name).where("name like ?", "%#{params[:term]}%") + Symptom.order(:name).where("name like ?", "%#{params[:term]}%") render json: @results.map(&:name) end end search_controller.rb: class SearchController < ApplicationController def index @results = Illness.search(params[:search]) + Symptom.search(params[:search]) respond_to do |format| format.html # index.html.erb format.json { render json: @results } end end end Thanks, Li

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  • [ruby] Check if file is a valid image

    - by some guy
    Hi all, I'm using rmagick to manipulate image files. I use the ImageList.new on each file to get started. When I apply this method to an invalid image file I get the below error which interrupts the execution of the script: RMagick.rb:1635:in `read': Improper image header (Magick::ImageMagickError) Therefore I would like to be able to check whether a file is a valid image file before using this method. Any ideas? Thanks.

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  • Ruby - Writing Hpricot data to a file

    - by John
    Hey everyone, I am currently doing some XML parsing and I've chosen to use Hpricot because of it's ease of use and syntax, however I am running into some problems. I need to write a piece of XML data that I have found out to another file. However, when I do this the format is not preserved. For example, if the content should look like this: <dict> <key>item1</key><value>12345</value> <key>item2</key><value>67890</value> <key>item3</key><value>23456</value> </dict> And assuming that there are many entries like this in the document. I am iterating through the 'dict' items by using hpricot_element = Hpricot(xml_document_body) f = File.new('some_new_file.xml') (hpricot_element/:dict).each { |dict| f.write( dict.to_original_html ) } After using the above code, I would expect that the output look like the following exactly like the XML shown above. However to my surprise, the output of the file looks more like this: <dict>\n", " <key>item1</key><value>12345</value>\n", " <key>item2</key><value>67890</value>\n", " <key>item3</key><value>23456</value\n", " </dict> I've tried splitting at the "\n" characters and writing to the file one line at a time, but that didn't seem to work either as it did not recognize the "\n" characters. Any help is greatly appreciated. It might be a very simple solution, but I am having troubling finding it. Thanks!

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  • ruby-on-rails: gravatar_for

    - by Heber
    Hi, I was following the site http://railstutorial.org/ and in the chapter 7, it shows an example of how to use gravatar_for. I tried to use it using <%= gravatar_for @user % but it does not render correctly in my browser (firefox/opera/chrome) it render this html: classgravatartitleratingPGstylewidth:50px;height:50px;background:url(http://www.gravatar.com/avatar/bebfcf57d6d8277d806a9ef3385c078d?rating=PG&size=50) no-repeat;sslfalsealtdefault Could someone give me the solution for this problem? I got stuck and I really don't know to solve this. Thank very much.

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  • DRY up Ruby ternary

    - by Reed G. Law
    I often have a situation where I want to do some conditional logic and then return a part of the condition. How can I do this without repeating the part of the condition in the true or false expression? For example: ClassName.method.blank? ? false : ClassName.method Is there any way to avoid repeating ClassName.method? Here is a real-world example: PROFESSIONAL_ROLES.key(self.professional_role).nil? ? 948460516 : PROFESSIONAL_ROLES.key(self.professional_role)

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  • Ruby on Rails POST parameters on redirect_to

    - by Splashlin
    I have to make a call to a different url in one of my controllers on my site. The problem is that with all the parameters the other site requires I'm overflowing the url. Is there anyway to call another url from the controller and send all of the parameters using a POST? I'm not expecting a response from the other site. Also, I think there's a way to do this using the Net::HTTP library thought I'm not sure how. Thanks

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  • Beginner += in Ruby

    - by WANNABE
    Looking at this block, I can follow the whole program until I hit, sum += square. What is he point of this line, what does it say??? sum = 0 [1, 2, 3, 4].each do |value| square = value * value sum += square end puts sum

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  • Ruby on rails form validation issue

    - by Anooj
    Am pretty new to ROR. Need help in Rails form validation. Hey, am using rails 2.3.5 I have a basic validates_presence_of for the fields in the form. Now when i don't enter field details, i do get an error, but the error is displayed as: {{count}} errors prohibited this {{model}} from being saved There were problems with the following fields: {{attribute}} {{message}} {{attribute}} {{message}} Any help will be highly appreciated.

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