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  • Working with anonymous modules in Ruby

    - by Byron Park
    Suppose I make a module as follows: m = Module.new do class C end end Three questions: Other than a reference to m, is there a way I can access C and other things inside m? Can I give a name to the anonymous module after I've created it (just as if I'd typed "module ...")? How do I delete the anonymous module when I'm done with it, such that the constants it defines are no longer present?

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  • Ruby on Rails questionnaire tutorial?

    - by kovrik
    Can't find any tutorial for creating a simple questionnaire system on RoR (without using Finite State Machines). I think the Model is simple: Quizzes (have many Questions) Questions (belong to Quizzes, have many Choices, have one Answer) Choices (belong to Questions) Responses (belong to Users, belong to Questions) Users (have many Responses). User logs in (session is created), chooses some Quiz (Questions which belong to this Quiz are shown). User navigates through the Questions, makes his choice (Response), finishes the Quiz. Responses are compared with Answers. System shows some results. But as I'm new to Rails it is difficult for me to make it work properly. Any help? Maybe there is a tutorial where some similar app is created?

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  • Shortcut for rake db:migrate:down for ruby-on-rails

    - by Michaël
    Hi, I want to know if there is a short way to do the migrations down equivalent to rake db:migrate (for the migrations up). Instead of doing : rake db:migrate:up VERSION=1, rake db:migrate:up VERSION=2, ... we can do : rake db:migrate! But for : rake db:migrate:down VERSION=10, rake db:migrate:down VERSION=..., rake db:migrate:down VERSION=1, is there a shortcut? Tank you for your help!

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  • How to organize a Shoes Ruby app?

    - by luca
    can I have some examples of how you organize your Shoes apps? I mean, simply using a Shoes.app{} block and instance variables is clumsy.. I'd like to achieve a MVC like structure.. I'm used to it (from rails, FLEX frameworks and others..) and would like to recreate something similar..

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  • Strange Email Activity Ruby on Rails

    - by Stranger
    Environment.rb ActionMailer::Base.delivery_method = :sendmail ActionMailer::Base.sendmail_settings = { :address = "mail.example.org", :domain = "example.org", :port = 25, :authentication = :login, :user_name = "email+email.org", :password = "password" } ActionMailer::Base.perform_deliveries = true ActionMailer::Base.raise_delivery_errors = true ActionMailer::Base.default_charset = "utf-8" Development.log Sent mail to [email protected] Date: Sat, 17 Apr 2010 19:38:08 -0500 From: example.org To: [email protected] Subject: Hello Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 The process of sending email is ok but when I check my email I didn't recive any. What seems to be wrong?

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  • Ruby gem to obscure data

    - by Jake
    Anyone know of a gem that will allow you to obscure/sanitize data? Usecase: Download a production database, run some sanitation so that real customers won't get emails, cards charged etc.

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  • Reading a file N lines at a time in ruby

    - by Sam
    I have a large file (hundreds of megs) that consists of filenames, one per line. I need to loop through the list of filenames, and fork off a process for each filename. I want a maximum of 8 forked processes at a time and I don't want to read the whole filename list into RAM at once. I'm not even sure where to begin, can anyone help me out?

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  • Basic Array Iteration in Ruby

    - by michaelmichael
    What's a better way to traverse an array while iterating through another array? For example, if I have two arrays like the following: names = [ "Rover", "Fido", "Lassie", "Calypso"] breeds = [ "Terrier", "Lhasa Apso", "Collie", "Bulldog"] Assuming the arrays correspond with one another - that is, Rover is a Terrier, Fido is a Lhasa Apso, etc. - I'd like to create a dog class, and a new dog object for each item: class Dog attr_reader :name, :breed def initialize(name, breed) @name = name @breed = breed end end I can iterate through names and breeds with the following: index = 0 names.each do |name| dog = Dog.new("#{name}", "#{breeds[index]}") index = index.next end However, I get the feeling that using the index variable is the wrong way to go about it. What would be a better way?

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  • Attaining Explicit and Predictable Ruby on Rails...

    - by Winston
    I need help, how can I learn this framework? Here's what I need to know. Routes, it's expected outcome, the prefix/suffix methods associated with every changes made with it. ActiveRecord, the dynamic generation of methods, the behind the scenes with prefix_ and _suffix methods. The View, how do I know what prefix/suffix methods can be used in the View. Is there's a way to know all those behind-the-scenes actions in console.

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  • Problem with migrating a model in ruby

    - by Shreyas Satish
    I run script/generate model query edit query.rb in models.. class Query < ActiveRecord::Base #I even tried Migrations instead of Base def sef.up create table :queries do|t| t.string :name end end def self.down drop_table :queries end end ,run rake db:migrate. and what I see in db is this: mysql> desc queries; +------------+----------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+----------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | created_at | datetime | YES | | NULL | | | updated_at | datetime | YES | | NULL | | +------------+----------+------+-----+---------+----------------+ Where is the "name" field? HELP ! Cheers !

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  • Strange ruby behavior when using Hash.new([])

    - by Valentin Vasilyev
    Consider this code: h=Hash.new(0) #new hash pairs will by default have 0 as values h[1]+=1 # {1=>1} h[2]+=2 # {2=>2} that's all fine, but: h=Hash.new([]) #empty array as default value h[1]<<=1 #{1=>[1]} - OK h[2]<<=2 #{1=>[1,2], 2=>[1,2]} # why ?? At this point I expect the hash to be: {1=>[1], 2=>[2]} But something goes wrong. Does anybody know what happens?

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  • [Ruby on Rails] scribd_fu gsub error

    - by siulamvictor
    I have an application which allow user upload documents to Scribd. I tried to use scribd_fu in Rails. An error occurred when the controller try to save the model. NoMethodError in DocumentsController#processupload private method `gsub' called for nil:NilClass here is the related controller def processupload @document = Document.new(params[:document]) if @document.save session[:scribdid] = @document.ipaper_access_key else xxxxx and this is the related html form <form action="/documents/processupload" enctype="multipart/form-data" method="post"> <input name="authenticity_token" type="hidden" value="FqTCmlGGIvRjiaiaa+YtF50wgI7FfpxfrZsulLCbXcw=" /> <label class="label_h2">Upload a Document</label> <input id="document_document_upload" name="document[document_upload]" size="30" type="file" /></div> <div class="buttons"><button type="submit" class="positive"><img src="/images/icons/tick.png" alt="Save Document"/>Save Document</button> </form> Is there anything wrong?

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  • Ruby &&= edge case

    - by Alan O'Donnell
    Bit of an edge case, but any idea why &&= would behave this way? I'm using 1.9.2. obj = Object.new obj.instance_eval {@bar &&= @bar} # => nil, expected obj.instance_variables # => [], so obj has no @bar instance variable obj.instance_eval {@bar = @bar && @bar} # ostensibly the same as @bar &&= @bar obj.instance_variables # => [:@bar] # why would this version initialize @bar? For comparison, ||= initializes the instance variable to nil, as I'd expect: obj = Object.new obj.instance_eval {@foo ||= @foo} obj.instance_variables # => [:@foo], where @foo is set to nil Thanks!

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  • Basic Ruby On Rails Linking Help

    - by dweebsonduty
    So I am beginning to work with Rails and I get some of the concepts but am stuck on an important one. Let's say I have customers which has many jobs and jobs which belongs to customers. How would I go about creating a new job for a customer? I can create a link that goes to customers/1/jobs/new and I can grab the customer ID but how do I tell it that I am creating a job for customer 1? I know this is the most basic of things but I just need a push in the right direction. This is my form so far: How do I get :customer_id to populate with the customer_id param? <h1>New job</h1> <% form_for(@job) do |f| %> <%= f.error_messages %> <p> <%= f.label :customer_id %><br /> <%= f.text_field :customer_id %> </p> <p> <%= f.label :manufacturer %><br /> <%= f.text_field :manufacturer %> </p> <p> <%= f.label :serial_number %><br /> <%= f.text_field :serial_number %> </p> <p> <%= f.label :problem %><br /> <%= f.text_area :problem %> </p> <p> <%= f.label :notes %><br /> <%= f.text_area :notes %> </p> <p> <%= f.label :status %><br /> <%= f.text_field :status %> </p> <p> <%= f.label :tech_id %><br /> <%= f.text_field :tech_id %> </p> <p> <%= f.submit 'Create' %> </p> <% end %> <%= link_to 'Back', jobs_path %>

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  • Ruby assertions and disabled inputs

    - by brad
    Does anyone know how to assert that a checkbox or input is disabled? I can't find anything to indicated that this is supported I'm writing cucumber tests with webrat and test/unit. I'd like to have a step that is able to assert_disabled :some_checkbox || assert_disabled :some_input. Or some way that I can check a property of the checkbox.

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  • How to retrieve caller context object in Ruby ?

    - by David
    Hi, hereafter is my piece of code that I want to simplify in order to avoid passing an extra argument on each call : module M def do_something(context) puts "Called from #{context}" end module_function :do_something end class Foo def do_stuff M.do_something(self) end end Foo.new.do_stuff Is there a way to do the same think without passing 'self' as an input argument to 'do_something' method like this ? module M def do_something puts "Called from #{method that returns caller object}" end module_function :do_something end class Foo def do_stuff M.do_something end end Foo.new.do_stuff Thanks for your support!

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