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  • Methods specific only to an instance? What are they called in Ruby?

    - by daremarkovic
    I know there are "instance methods", "class methods" but what are these types of methods called, for eg: s1 = "This is my STRING!" def s1.m1 downcase end p s1 # => "This is my STRING!" p s1.m1 # => "this is my string!" What type of method is the "m1" method called on the s1 "instance" of the "string" class? It's really weird because I didn't know this was possible at all if I try: s2 = "This is ANOTHER string" s2.m1 # => Won't work! Which kind of makes sense, but not sure why defining methods like m1 on instances on a class are useful at all.

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  • [Ruby on Rails] how to add a new entry with a multiple has_many association?

    - by siulamvictor
    I am not sure am I doing these correct. I have 3 models, Account, User, and Event. Account contains a group of Users. Each User have its own username and password for login, but they can access the same Account data under the same Account. Events is create by a User, which other Users in the same Account can also read or edit it. I created the following migrations and models. User migration class CreateUsers < ActiveRecord::Migration def self.up create_table :users do |t| t.integer :account_id t.string :username t.string :password t.timestamps end end def self.down drop_table :users end end Account migration class CreateAccounts < ActiveRecord::Migration def self.up create_table :accounts do |t| t.string :name t.timestamps end end def self.down drop_table :accounts end end Event migration class CreateEvents < ActiveRecord::Migration def self.up create_table :events do |t| t.integer :account_id t.integer :user_id t.string :name t.string :location t.timestamps end end def self.down drop_table :events end end Account model class Account < ActiveRecord::Base has_many :users has_many :events end User model class User < ActiveRecord::Base belongs_to :account end Event model class Event < ActiveRecord::Base belongs_to :account belongs_to :user end so.... Is this setting correct? Every time when a user create a new account, the system will ask for the user information, e.g. username and password. How can I add them into correct tables? How can I add a new event? I am sorry for such a long question. I am not very understand the rails way in handling such data structure. Thank you guys for answering me. :)

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  • In Ruby, how do I make a hash from an array?

    - by Wizzlewott
    I have a simple array: arr = ["apples", "bananas", "coconuts", "watermelons"] I also have a function f that will perform an operation on a single string input and return a value. This operation is very expensive, so I would like to memoize the results in the hash. I know I can make the desired hash with something like this: h = {} arr.each { |a| h[a] = f(a) } What I'd like to do is not have to initialize h, so that I can just write something like this: h = arr.(???) { |a| a => f(a) } Can that be done?

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  • How can I define the search scope by "this week" meaning Monday - Friday in Ruby on Rails?

    - by Angela
    This is an extension of an earlier question. I realized, what I really want is to go to a URL /report/thisweek and it will do a .find (or named_scope) across contact_emails.date_sent where date_sent is between MONDAY and FRIDAY of the week to which Date.today belongs. In other words, if today is THURSDAY, it will do a search for all emails MONDAY through THURSDAY of this week. Not sure if this is doable or makes sense, but I think that's what I'd ultimately am trying to do. Thanks!

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  • What data (if any) persists across web-requests in Ruby on Rails?

    - by Daniel Beardsley
    I decided to use the singleton design pattern while creating a view helper class. This got me thinking; will the singleton instance survive across requests? This led to another question, Which variables (if any) survive across web requests and does that change depending on deployment? (Fastcgi, Mongrel, Passenger, ...) I know that Controller instance variables aren't persisted. I know Constants are persisted (or reloaded?). But I don't know about class variables, instance variables on a class, Eigenclasses, ...

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  • How can I use && in if in Ruby on Rails?

    - by Angela
    I tried the following && conditional for my if statement and I get a "bad range" error: <% if (from_today(contact, call.days) == 0..7) && (show_status(contact, call) == 'no status') %> Why and how can I fix it? The only other way I could do it was to have a second nested if statement and break it apart...not pretty :(

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  • In ruby on rails, is it possible to do a sum query with group by using the find_each batching?

    - by BarryOg
    I'm loading data from my database and I'm doing a sum calculation with a group by. ElectricityReading.sum(:electricity_value, :group => "electricity_timestamp", :having => ["electricity_timestamp = '2010-02-14 23:30:00'"]) My data sets are extremely large, 100k upwards so I was wondering if its possible to use the find_each to batch this to help with memory overhead. I can write the batching manually use limit and offset I guess but I'd like to avoid that if the code already exists.

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  • Is there a Ruby on Rails framework like equivalent for .NET development?

    - by wgpubs
    Answers like ASP.NET MVC or Entity Framework really aren't acceptable as they address just one aspect of the problem domain. I'm looking for a framework ... a REAL framework that gives me the same features out of the box that Rails does. As such it should include at minimum: MVC for presentation ORM Ability to provide simple configuration for whatever environment (dev, QA, Production, etc...) Migration like functionality Ability to generate code in all layers (similar to scaffolding like behavior, etc...) Project template so as to create similar functionality as the "rails my_app" command. Thanks.

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  • Ways to Unit Test Oauth for different services in ruby?

    - by viatropos
    Are there any best practices in writing unit tests when 90% of the time I'm building the Oauth connecting class, I need to actually be logging into the remote service? I am building a rubygem that logs in to Twitter/Google/MySpace, etc., and the hardest part is making sure I have the settings right for that particular provider, and I would like to write tests for that. Is there a recommended way to do that? If I did mocks or stubs, I'd still have to spend that 90% of the time figuring out how to use the service, and would end up writing tests after the fact instead of before...

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  • How do I pass a conditional expression as a parameter in Ruby?

    - by srayhan
    For example this what I am trying to do, def method_a(condition, params={}, &block) if condition method_b(params, &block) else yield end end and I am trying to call the method like this, method_a(#{@date > Date.today}, {:param1 => 'value1', :param2 => 'value2'}) do end The result is the condition is always evaluated to true. How do I make it work?

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  • How can I update my business' Facebook page via my Ruby on Rails app?

    - by Eric S.
    I'm creating a new rails app for my business, and I just finished a new feature where I can put an announcement on the website (for specials, sales, etc.). I want this announcement to automatically be set to my business' Facebook page. How can I easily do this? Is the only way to create a Facebook application, and then if so, can a Facebook application have permissions to edit a business' page (I know apps can edit user profiles, but I don't know about business pages)? Thanks for any help!

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  • Adding an ID or Class in Ruby on Rails?

    - by Probocop
    I've got the following code for a search form, but how would I add an ID or a class to the submit button? <% form_tag '/wine/search/', :method => 'get' do %> <%= label_tag "Search" %> <%= text_field_tag :search_string, params[:search_string] %> <%= submit_tag "Go" %> <% end %> Thanks

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  • [ruby] How to convert STDIN contents to an array?

    - by miketaylr
    I've got a file INPUT that has the following contents: 123\n 456\n 789 I want to run my script like so: script.rb < INPUT and have it convert the contents of the INPUT file to an array, splitting on the new line character. So, I'd having something like myArray = [123,456,789]. Here's what I've tried to do and am not having much luck: myArray = STDIN.to_s myArray.split(/\n/) puts field.size I'm expecting this to print 3, but I'm getting 15. I'm really confused here. Any pointers?

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  • Can't install a ruby gem because of an error?

    - by Alex
    Hey there, trying to install a ruby gem but I keep getting the following error: ERROR:failed to build gem native extension /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb mkmf.rb can't find header files for ruby at/System/ Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h I'm not exactly sure what is happening here. Is there anyone that knows what is going on and how to fix it? Thanks!

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  • Weird execution of ruby/git executables in Windows

    - by Frexuz
    Something strange has happened. I can't run some command line executables in Windows anymore. Steps: Open cmd Run an executable, such as ruby -v or git -h When I do that, a new command prompt opens, running that command (I think, it's too fast to see), and instantly closes again. I've managed to print screen the new command prompt, and it shows that it's running inside this path: C:\Documents and Settings\Administrator\Local Settings\Temp\3582-490 Inside this folder, is the executable I'm tring to run. If I run ruby, then ruby.exe is in there. If I run git, then git.exe is in there. And it's always emptying the folder in between, so there is always just one .exe file

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  • Textmate rails bundle

    - by Yuval
    Normally when working inside a Ruby on Rails view file, I can hit CTRL + SHIFT + . to get open/close tags for rails like so: <%= selection %> I'm not sure how, but yesterday this functionality stopped working. I reinstalled the Ruby on Rails bundle for Textmate but alas, it did not help. Can anybody speculate might have happened and how I could fix it/reset to original settings? Thanks!

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  • Is there a max thread per mongrel?

    - by Blankman
    I don't know much about ruby, much less how or what is involved with hosting a ruby on rails web app. BUT, I recall hearing someone saying that they have to run multiple mongrels b/c of a limit of 50 threads? Is this true (or something similiar)? Why does it have this limitation?

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