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• Change model name in rails easily

  - by Kenji Crosland

  I'm going to need to change one of my model names. Is there anything out there that will replace every instance of the original model name in the controllers views and tests or do I have to do it all manually, page by page?

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• Scalability of Ruby on Rails versus PHP

  - by Daniel

  Can anyone comment on which is more scalable between RoR and PHP? I have heard that RoR is less scalable than PHP since RoR has a little more overhead with its MVC framework while PHP is more low level and lighter. This is a bit vague - can anyone explain better?

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• Rails 3 authetication with OpenID, Twitter or Facebook

  - by user142913

  Can you suggest some working example of it? I tried Authlogic and Devise withous success.

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• Needed help with deleting rails cache

  - by WarDoGG

  I have been given a project of editing a website which is coded in RoR. However, the changes which i make in the view file is not visible immediately after a hard refresh but after 15-20 mins, the changes reflect. I am guessing this has something to do with the RoR caching system. Can someone please help me out ? The changes i made are purely HTML based like changing HTML attributes, filenames etc...

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• Ruby on Rails: link_to_remote and rel

  - by DerNalia

  I want a link to remote to have a rel tag, because I want to use facebox with it. I had it working with a regular link to... but I needed the link to remote to handle the event that a user doesn't have javascript enabled. this, currently does't work (except for the non-javascript part ) <%= link_to_remote "Ask a Question", {:url => {:action => :ask_question, :id => @container.id.to_s, :javascript_disabled => false }, :rel => 'facebox'}, :href => url_for( :controller => :view, :action => :ask_question, :id => @container.id.to_s, :javascript_disabled => true) %>

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• Rails - Accessing model class methods from within ActiveRecord model

  - by aaronrussell

  I have a simple standalone model that doesn't inherit from ActiveRecord or anything else, called SmsSender. As the name suggests, it delivers text messages to an SMS gateway. I also have an ActiveRecord model called SmsMessage which has an instance method called deliver: def deliver SmsSender.deliver_message(self) self.update_attributes :status => "Sent" end The above is returning uninitialized constant SmsSender. I'm sure this is dead simple, but how can I access the SmsSender class from within my model?

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• Rails: Getting rid of generic "X is invalid" validation errors

  - by DJTripleThreat

  I have a sign-up form that has nested associations/attributes whatever you want to call them. My Hierarchy is this: class User < ActiveRecord::Base acts_as_authentic belongs_to :user_role, :polymorphic => true end class Customer < ActiveRecord::Base has_one :user, :as => :user_role, :dependent => :destroy accepts_nested_attributes_for :user, :allow_destroy => true validates_associated :user end class Employee < ActiveRecord::Base has_one :user, :as => :user_role, :dependent => :destroy accepts_nested_attributes_for :user, :allow_destroy => true validates_associated :user end I have some validation stuff in these classes as well. My problem is that if I try to create and Customer (or Employee etc) with a blank form I get all of the validation errors I should get plus some Generic ones like "User is invalid" and "Customer is invalid" If I iterate through the errors I get something like: user.login can't be blank User is invalid customer.whatever is blah blah blah...etc customer.some_other_error etc etc Since there is at least one invalid field in the nested User model, an extra "X is invalid" message is added to the list of errors. This gets confusing to my client and so I'm wondering if there is a quick way to do this instead of having to filer through the errors myself.

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• Rails 2.3: How to create this SQL into a named_scope

  - by randombits

  Having a bit of difficulty figuring out how to create a named_scope from this SQL query: select * from foo where id NOT IN (select foo_id from bar) AND foo.category = ? ORDER BY RAND() LIMIT 1; Category should be variable to change. What's the most efficient way the named_scope can be written for the problem above?

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• Nested routing in Ruby on Rails

  - by vooD

  My model class is: class Category < ActiveRecord::Base acts_as_nested_set has_many :children, :foreign_key => "parent_id", :class_name => 'Category' belongs_to :parent, :foreign_key => "parent_id", :class_name => 'Category' end def to_param slug end Is it possible to have such recursive route like this: /root_category_slug/child_category_slug/child_of_a_child_category_slug ... and so one Thank you for any help :)

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• Rails: render a partial from a plugin

  - by Sam

  I'm getting a missing template error after I try rendering a partial from a plugin. I have included the files with the following: %w{ models controllers helpers views }.each do |dir| path = File.join(File.dirname(__FILE__), 'app', dir) $LOAD_PATH << path ActiveSupport::Dependencies.load_paths << path ActiveSupport::Dependencies.load_once_paths.delete(path) end The Models are getting loaded, but as for other things I'm not sure what's going on. The helpers are not getting loaded too because I just copied the contents of the partial from the plugin instead of the render :partial = and then it came up with a helper error. Question is how to be able to :render :partial = from the views folder in my plugin

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• Ruby on Rails activerecord find average in one sql and Will_Paginate

  - by Darkerstar

  Hi all I have the following model association: a student model and has_many scores. I need to make a list showing their names and average, min, max scores. So far I am using student.scores.average(:score) on each student, and I realise that it is doing one sql per student. How can I make the list with one joined sql? Also how would I use that with Will_Paginate plugin? Thank you

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• and or operator in validates_presence_of of a Ruby on Rails model

  - by user284194

  I have an entry.rb model and I'm trying to make a semi-complicated validation. I want it to require one or more of the following fields: phone, phone2, mobile, fax, email or website. How would you write the intended code? Would something like this work? validates_presence_of :phone and or :phone2 and or :mobile and or :fax and or :email and or :website

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• Rails Seed confusion

  - by sscirrus

  I'm having trouble seeding my database using seed.rb, specifically where table relationships are concerned. Here's a sample of the code: # seed.rb user = User.find_or_create_by_login( :login => "myname", :email => "[email protected]", :user_type => "Admin", :password => "admin", :password_confirmation => "admin") project = Project.find_or_create_by_user_id( :user_id => user.id, :name => "Test Project") When project is created (along with other unrelated parameters I've left out from above), user_id is empty. How can I get this to work?

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• rails expiring cache

  - by ash34

  Hi, I entered some products data into a table using a migration. I need to expire the page and fragment cache when I update, add, delete products from this table. I created a sweeper for this. class ProductSweeper < ActionController::Caching::Sweeper observe Product def after_create expire_cache end def after_save expire_cache end def after_update expire_cache end def after_destroy expire_cache end private def expire_cache expire_page(:controller => 'ProductsController', :action => 'index') expire_fragment 'listed_products' end end Then in script/console I update the product name and saved. When I reload my app in the browser it still gives me a cache hit. Cached fragment hit: views/listed_products (0.2ms) Can someone tell me how to expire this cache. I will not be adding, updating, deleting products through a controller action. thanks, ash

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• Disable validation in an object in Ruby on Rails

  - by J. Pablo Fernández

  I have an object which whether validation happens or not should depend on a boolean, or in another way, validation is optional. I haven't found a clean way to do it. What I'm currently doing is this (disclaimer: you cannot unsee, leave this page if you are too sensitive): def valid? if perform_validation super else super # Call valid? so that callbacks get called and things like encrypting passwords and generating salt in before_validation actually happen errors.clear # but then clear the errors true # and claim ourselves to be valid. This is super hacky! end end Any better ways? Before you point to the :if argument of many validations, this is for a user model which is using authlogic so it has a lot of validation rules. You can stop reading here if you belive me. If you don't, authlogic already sets some :ifs like: :if => :email_changed? which I have to turn into :if => Proc.new {|user| user.email_changed? and user.perform_validation} and in some other cases, since I'm also using authlogic-oid (OpenID) I just don't have control over the :if, authlogic-oid sets it in a way I cannot change it (in time) without further monkey patching. So I have to override seemingly unrelated functions, catch exceptions if a method doesn't exist, etc. The previous hacky solution if the best of my two attempts.

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• Loading and managing reference data in Rails

  - by jonnii

  Most of the apps I've worked on have had some kind of reference data stored in the database, for example categories, zipcodes, area codes etc... this is information that's going to change very infrequently. Most of the time you want to load some kind of display name, and that's it. Currently this isn't causing me too many headaches, it's easy to :include the models I need when doing my queries, but going forward it causes a lot of query noise. Ideally I'd like to load the reference data when the app starts and when referencing it in queries it'll load from the cache instead of going to the database. What's the best way to manage this?

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• Ruby on Rails: Javascript: How to grob focus when the text box appears

  - by DerNalia

  So, I have <script type="text/javascript"> function grabFocus(){ document.getElementByID("category_name").focus(); } </script> <div> <h1>New category</h1> <br/> <% remote_form_for :category, @category, :url=>{:action=>'ajax_create'} do |f| %> <%= f.error_messages %> <%= f.hidden_field :object_type %> <p> <%= f.text_field :name, :label=>false %> <%= f.submit 'Create' %> </p> <% end %> <br/> </div> and before I just had the <script type="text/javascript"> document.getElementByID("category_name").focus(); </script> at the bottom of the file. but other websites suggested that I make it a function, and call it in onLoad... but the partial I'm working with (entire thing pasted above) doesn't have a body... I'm showing the partial in the iframe that facebox uses... ideas?

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• Rails page caching and flash messages

  - by KJF

  I'm pretty sure I can page cache the vast majority of my site but the one thing preventing me from doing so is that my flash messages will not show, or they'll show at the wrong time. One thing I'm considering is writing the flash message to a cookie, reading it and displaying it via javascript and clearing the cookie once the message has been displayed. Has anyone had any success doing this or are there better methods? Thanks.

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• Using URI-fragments in Ruby on rails routing

  - by Alexei

  RoR application can generate URL such as /post/10. But now I want to create a site, which works with URI-fragments like gmail. For example gmail uses the following URLs https://mail.google.com/mail/?shva=1#sent https://mail.google.com/mail/?shva=1#label/books I need to generate URL such as /#/post/10, where controller = "post", action = "show", id = "10". Of course it will be good to use standard url-helpers.

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• How do I REALLY get started programming in Ruby on Rails

  - by Nate

  I can't figure out where exactly to go in order to write the Ruby code itself. I know that I can enter things line-by-line in Terminal (I'm on a Mac), but I'd like to figure out how to start using something like Xdrive (Apple won't allow me to download Xrive because I have OS X 10.5, not 10.6). What steps do I need to take in order to start writing code in a program like xDrive. Thank you in advance.

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• Ruby on Rails and database associations

  - by Marco

  Hi to all, I'm new to the Ruby world, and there is something unclear to me in defining associations between models. The question is: where is the association saved? For example, if i create a Customer model by executing: generate model Customer name:string age:integer and then i create an Order model generate model Order description:text quantity:integer and then i set the association in the following way: class Customer < ActiveRecord::Base has_many :orders end class Order < ActiveRecord::Base belongs_to :customer end I think here is missing something, for example the foreign key between the two entities. How does it handle the associations created with the keywords "has_many" and "belongs_to" ? Thanks

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• streaming files in ruby on rails

  - by user163352

  I just uploaded files(doc & pdf) in my web server(with my coding). I want to stream those files when I click download link on my page. please share any tutorials or any suggestions?

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• How to test the XML sent to a web service in Ruby/Rails

  - by Jason Langenauer

  I'm looking for the best way to write unit test for code that POSTs to an external web service. The body of the POST request is an XML document which describes the actions and data for the web service to perform. Now, I've wrapped the webservice in its own class (similar to ActiveResource), and I can't see any way to test the exact XML being generated by the class without breaking encapsulation by exposing some of the internal XML generation as public methods on the class. This seems to be a code smell - from the point-of-view of the users of the class, they should not know, nor care, how the class actually implements the web service call, be it with XML, JSON or carrier pigeons. For an example of the class: class Resource def new #initialize the class end def save! Http.post("http://webservice.com", self.to_xml) end private def to_xml # returns an XML representation of self end end I want to be able to test the XML generated to ensure it conforms to what the specs for the web service are expecting. So can I best do this, without making to_xml a public method?

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• Rails find_or_create by more than one attribute?

  - by tybro0103

  There is a handy dynamic attribute in active-record called find_or_create_by: Model.find_or_create_by_<attribute>(:<attribute> => "") But what if I need to find_or_create by more than one attribute? Say I have a model to handle a M:M relationship between Group and Member called GroupMember. I could have many instances where member_id = 4, but I don't ever want more than once instance where member_id = 4 and group_id = 7. I'm trying to figure out if it's possible to do something like this: GroupMember.find_or_create(:member_id => 4, :group_id => 7) I realize there may be better ways to handle this, but I like the convenience of the idea of find_or_create.

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• rails multiple outer joins syntax

  - by Craig McGuff

  I have the following models user has_many :leave_balances leave_balance belongs_to :user belongs_to :leave_type leave_type has_many :leave_balances I want to output a table format showing user names and their balance by leave type. Not every user can have every balance i.e. outer joins required. I'd like to see something like this: Employee Annual Leave Sick Leave Bob 10 Fred 9 Sara 12 15 I am unsure how to get this out as a single statement? I am thinking something like User.joins(:leave_balances).joins(:leave_type)

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