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• Rails: validation that spans multiple models, where to put it?

  - by randombits

  I have a custom validation method that is exactly the same for two or more models. Where's the best place to put this validation method so that both models can access it and keep things DRY? If the validation fails, I also want to use errors.add_to_base, so wherever this method is put, I should be able to accommodate for that.

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• Is it possible to have variable find conditions for both the key and value?

  - by DarrenD

  I'm trying to pass in both the field and the value in a find call: @employee = Employee.find(:all, :conditions => [ '? = ?', params[:key], params[:value].to_i) The output is SELECT * FROM `employees` WHERE ('is_manager' = 1) Which returns no results, however when I try this directly in mysqsl using the same call without the '' around is_manager, it works fine. How do I convert my params[:key] value to a symbol so that the resulting SQL call looks like: SELECT * FROM `employees` WHERE (is_manager = 1) Thanks, D

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• Rails layouts per action?

  - by mrbrdo

  I use a different layout for some actions (mostly for the new action in most of the controllers). I am wondering what the best way to specify the layout would be? (Consider like I am using 3 or more different layouts in the same controller) I don't like using render :layout = 'name' that much. I did like doing layout 'name', :only = [:new] but it turns out I can't use that to specify 2 different layouts (e.g. if I call layout 2 times in the same controller, with different layout names and different only options, the first one gets ignored - those actions don't display in the layout i specified). I'm using Rails 2.

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• How Would you Mimic an Arbitrary Directory Structure with Rails Routes?

  - by viatropos

  I want to be able to map Google Docs' folder system to urls in my application and am just wondering how I can say "route, I want you to match an arbitrary set of nodes, and the last one is the file (or possibly a directory, I can check in the controller)". So I could do things like: www.mysite.com/documents/folder1/childfolderA/document www.mysite.com/documents/root-level-doc Can the routes.rb file do something like this?

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• How to override 'where' in rails 3

  - by Zakwan Alhajjar

  I have upgraded my application from rails 2.3.8 to 3.0.3 . But I'm facing a problem. I was using 'find' but the overriding doesn't work in rails 3: # override activerecord's find to allow us to find by name or id transparently def self.find(*args) if args.is_a?(Array) and args.first.is_a?(String) and (args.first.index(/[a-zA-Z\-_]+/) or args.first.to_i.eql?(0) ) find_by_login_slug(args) else super end end I'm wondering if there is a way to make this work in rails 3 or even by using where instead. thanks

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• Contents of a node in Nokogiri

  - by Styggentorsken

  Is there a way to select all the contents of a node in Nokogiri? <root> <element>this is <hi>the content</hi> of my æøå element</element> </root> The result of getting the content of /root/element should be this is <hi>the content</hi> of my æøå element Edit: It seems like the solution is simply to use myElement.inner_html(). The problem I had was in fact that I was relying on an old version of libxml2, which escaped all the special characters.

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• Rails autocomplete plugin.

  - by piemesons

  Hello Is there any plugin available for auto complete like in stackoverflow. Right now i am using acts_as_taggable plugin. I want to check the new created tag, autocomplete with comma separate. How to use auto_complete plugin and acts_as_taggable both. Consider the thing done in stackoverflow tag case.

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• How can you identify all events before and after a today in IRB?

  - by Trip

  I for the life of me can't figure out the correct syntax to show the count of events before and after today. Here's my awful and disgusting attempt: Events.find(:all).select {|e| e.date Time.now}.size The trouble is the or < operators don't work with Time.. :D

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• Calling to_xml on an Array of ROXML objects results in an empty collection

  - by findchris

  Hi there. I have a ROXML object that looks like: class Activity include ROXML xml_accessor :id end If I have an array of these objects and call .to_xml on the array, I receive an empty xml collection: "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<activities type=\"array\">\n</activities>\n" Any idea why or how to fix this? I'm running Rails 2.3.5 with the newest version of ROXML. Thanks

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• Rails: find_by, conserving leading whitespaces

  - by peppermonkey

  Hi, when I do the following def somefunction @texts = A.find_all_by_someid(someid) respond_to do |format| format.xml { render :xml => @texts } end end it gets the string from the db correctly, except if the string has leading whitespaces, it seems they are trimmed. Note: the whitespaces are there in the db correctly What can I do to conserve those whitespaces? Thanks

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• Testing instance variables from controllers with rspec

  - by Thiago

  Hi, I am trying to get the following spec to run: describe BlacklistController, "GET index" do it "should display the list of universally blocked numbers" do get :index debugger assigns[:blocked_numbers].should contain "190" end end Here's the action def index @blocked_numbers << "190" respond_to do |format| format.html end end And the failure simply says that assigns[:blocked_numbers} is nil. Why's that?

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• Rails valiation among a three model relationship

  - by Andrew

  I'm working on a three model relationship with one aspect that I'm not sure how to approach. Here's the basic relationship: class Taxonomy has_many :terms # attribute: `inclusive`, default => false end class Term belongs_to :taxonomy has_and_belongs_to_many :photos end class Photo has_and_belongs_to_many :terms end This is pretty straightforward stuff except for one thing: A Taxonomy can be either 'Inclusive' or 'Exclusive'. Exclusive means the terms are mutually exclusive, Inclusive means they're not. So, if a Taxonomy is exclusive ie. taxonomy.inclusive = false, then there can only be one term from that taxonomy attached to a given photo. Now, I can handle this on the client-side without a problem, but I am not quite sure how to set up a validation on Photos (or somewhere else) that says basically: "validate that no more than one term from an exclusive taxonomy is associated with this record." Any ideas on how to do that?

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• Test Redirection with RSpec and Capybara (Rails)

  - by balanv

  I just have learnt how cool RSpec and Cabybara is, and now working around it to learn writing actual test. I am trying to check if after clicking a link, there is a redirection to a specific page. Below is the scenario 1) I have a page /projects/list - I have an anchor with html "Back" and it links to /projects/show Below is the test i wrote in rspec describe "Sample" do describe "GET /projects/list" do it "sample test" do visit "/projects/list" click_link "Back" assert_redirected_to "/projects/show" end end end The test fails with a failure message like below Failure/Error: assert_redirected_to "/projects/show" ArgumentError: @request must be an ActionDispatch::Request Please suggest me on how i should test the redirection and what am i doing wrong?

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• Multiple row insertion in a faster way

  - by Cyborgo

  Hi, I am using rails and I am trying to insert new rows into the table. The data comes from a text file and I created hash with one of the attribute as key. Then I find all the keys that are currently not in the table. Then I need to insert all of them into the table with all the attributes that I saved in hash. newvals.each{ |x| author = Author.create(:first => x, :second => hash[x][0], :third => hash[x][1]) author.save } This has lot of overhead as it makes an SQL update one at time. The newals array is usually quite big around the size of 20-30k. I know create can insert multiple objects at once, but I cant seem to figure out how. Is there any way to get this done. Thanks.

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• map.resources, :as => root?

  - by Newy

  I'd like to map my Users to root - so '/:id'. I do the following now map.connect ':id', :controller = 'users', :action = 'show' ... but I'd also like the links that are generated by Rails to have this format. Can I do a map.resources ... :as = :root or something similar?

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• Pushing to an array not working as expected

  - by Ross Attrill

  When I execute the code below, my array 'tasks' ends up with the same last row from the dbi call repeated for each row in the database. require 'dbi' require 'PP' dbh = DBI.connect('DBI:ODBC:Driver={SQL Server Native Client 10.0};Server=localhost,1433;Database=db;Uid=db;Pwd=mypass', 'db', 'mypass') sth = dbh.prepare('select * from TASK') sth.execute tasks = Array.new while row=sth.fetch do p row tasks.push(row) end pp(tasks) sth.finish So if I have two rows in my TASK table, then instead of getting this in the tasks array: [[1, "Task 1"], [2, "Task 2"]] I get this [[2, "Task 2"], [2, "Task 2"]] What am I doing wrong?

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• ImageMagick is not processing images, but gives no errors.

  - by Trip

  My problem is is that paperclip saves the attachments appropriately, and I assume imagemagick is doing something right. With no errors returning, the images never finish processing. Does anyone know a way to see what's backgrounding? Or specifically a way to review imagemagick's processes?

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• Rails - single ID for multiple models

  - by user352351

  I'm building an app which will allow a user to scan the barcode on a 'shelf', 'box' or 'product' which will then bring up that particular item or all the associated items. As these are all separate models with their own ID's, I need a global ID table. I was thinking of a polymorphic table called 'barcodes' barcodes id barcode_number barcodable Is there an easy way to do this? Or is polymorphic the best way?

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• rails active record - Advanced find

  - by par

  I have the following model setup - a User is interested in projects in many project Categories. Each Project has many categories. Like so: class User has_many :projects has_and_belongs_to_many :project_categories class Project belongs_to :user has_and_belongs_to_many :project_categories class ProjectCategory has_and_belongs_to_many :projects has_and_belongs_to_many :users Now, I'd like to do a find for projects with any of the catogories that a certain user are interested in, i.e. if a user is interested in project categories A,B,C then I'd like to find projects which are part of one or more of those project categories. Anyone?

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• rails log rotation behaves weird (rails version 2.3.5)

  - by robodo

  I'm trying to setup log rotation in rails. I have put this in my environment/development.rb: config.logger = Logger.new("#{RAILS_ROOT}/log/#{ENV['RAILS_ENV']}.log", 1, 5*1048576) 2 files are created :-) but it looks like rails is writing to them randomly and at the same time as well. This creates messy log files :-( what am I missing?

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• Rails query to find other likes based on category

  - by Mik

  I need to do something like the following: Find other categories people like based on the categories you like. I have a likes table, which is joined to users and categories. I need to do an efficient query to find out what other categories people who liked a given category also like. Any thoughts on this would be appreciated. Thanks in advance.

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• HABTM checking for match of latest 3

  - by user333614

  Here's an interesting one for you folks... I have a HABTM (has_and_belongs_to_many) relationship between "Dogs" and "Trips". My goal is to find two result sets: 1) Dogs that have been on at least 1 of the last 3 trips and call that @dogs_current 2) Dogs that have NOT been on any of the last 3 trips and call that @dogs_old I found that I can find what the last 3 trips are by doing this in the Trip model: named_scope :last3, :order => 'date DESC', :limit => 3 But not sure how to use that list get 1 and 2. This hack works, but it seems ugly. There must be a better way! :) @dogs_current = [] @dogs_old = [] @dogs.each do |dog| if (Trip.last3 - dog.trips).size < 3 then @dogs_current << dog else @dogs_old << dog end end Any ideas? Thanks! -Cam

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• New to Git. Made a big mistake with git commit and ended up at an older commit

  - by Ramario Depass

  I'm new to Git and I've made a huge mistake. Git kept prompting me with git - rejected master -> master (non-fast-forward). But, I still committed by using: --force This was disastrous, the whole project changed back to the stage it was at about a week ago. I've lost so many changes. I seem to have been pushed back to an earlier commit. Is there anyway I can get back to one of my newer commits? As I have made an enormous amount of changes and need to get them back. Thanks.

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• Is it possible to enforce a controller method to work only for specific HTTP methods?

  - by Shay Friedman

  I was wondering if there was a way to make controller methods in rails available only for specific HTTP methods (GET, POST, etc.). I guess I can create a filter to do that but it seems to me that it is something that is available out-of-the-box in rails. Is it?

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• Rails Scope for association of 0 size.

  - by MissingHandle

  I'm having trouble figuring out the scope method for all the Foos that have no Bars. That is: class Foo < ActiveRecord::Base has_may :bars end class Bar < ActiveRecord::Base belongs_to :foo end I'd like to write a scope method that returns me all the foos that have no bars. Something like: class Foo < ActiveRecord::Base has_may :bars scope :has_no_bars, includes(:bars).where("COUNT(foo.bars) = 0") end But I don't understand the appropriate syntax. Any help? Happy to use a MetaWhere solution if easier.

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