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• RoR: How to prevent Url change after erronous edit?

  - by CharlesS

  In a standard generated scaffold project, when you are on an edit page, the URL looks like; /something/3/edit However, when the page doesn't validate, it runs the following code: format.html { :action => "new" } and the page url changes to; /something/3 (no /edit) Why is this is this and how to prevent it, as it looks inconsistent to me and thus confusing. Thanks

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• defaults for to_json in Rails with :include

  - by prateekdayal

  Let us say I have a model Post which belongs to a User. To convert to json, I do something like this @reply.to_json(:include => {:user => {:only => [:email, :id]}, :only => [:title, :id]) However, I want to set some defaults for this so I don't have to specify :only everytime. I am trying to override as_json to accomplish this. When I add as_json in User model, it is called when I do @user.to_json but when user is included in @reply.to_json, my overriden as_json for User is ignored. How do I make this work? Thanks

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• Strange DataMapper (0.10.2) error. Please help!

  - by Joel M.

  See the full error here: http://notesapp.heroku.com/ I'm using DataMapper and dm-validations 0.10.2. No matter how much I tweak my models, I get the same error, or another one. Here's how my model looks like: class User include DataMapper::Resource attr_accessor :password, :password_confirmation property :id, Serial, :required => true property :email, String, :required => true, :format => :email_address, :unique => true property :hashed_password, String property :salt, String, :required => true property :created_at, DateTime, :default => Time.now property :permission_level, Integer, :default => 1 validates_present :password_confirmation, :unless => Proc.new { |t| t.hashed_password } validates_present :password, :unless => Proc.new { |t| t.hashed_password } validates_is_confirmed :password

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• Rails botches the SQL on a complex save

  - by Dan B

  Hi, I am doing something seemingly pretty easy, but Rails is messing up the SQL. I could just execute my own SQL, but the framework should be able to handle this. Here is the save I am trying to perform: w = WhipSenVote.find(:first, :conditions => ["whip_bill_id = ? AND whip_sen_id = ?", bill_id, k]) w.votes_no = w.votes_no - 1 w.save My generated SQL looks like this: SELECT * FROM "whip_sen_votes" WHERE (whip_bill_id = E'1' AND whip_sen_id = 7) LIMIT 1 And then: UPDATE "whip_sen_votes" SET "votes_yes" = 14, "updated_at" = '2009-11-13 19:55:54.807000' WHERE "id" = 15 The first select statement is correct, but as you can see, the Update SQL statement is pretty wrong, though the votes_yes value is correct. Any ideas? Thanks!

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• Rails - Send emails through an exchange server

  - by Saurabh

  How does one use an exchange server to - Send an email from a rails application Authenticate credentials (user name / password) Thanks.

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• how to read only english characters

  - by ralph

  I am reading a file that sometimes has chinese and characters of languages other than english. How can I write a regex that only reads english words/letters? should it just be /^[a-zA-Z]+/ ? If I do the above then words like eété will still be picked but I don't want them to be picked: "été".match(/^[a-zA-Z]+/) => #nil good I didnt want that word "eété".match(/^[a-zA-Z]+/) => #not nil tricked into picking something i did not want

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• Advice on applying RSpec to existing code

  - by Paul

  I have been an evil coder - working like crazy to get a ROR demo operational and ignoring RSpec. Does anyone have any helpful (aka; friendly) advice on using RSpec to get the current implementation under BDD control? Especially pitfalls to avoid. Many thanks.

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• Local variable not being passed to partial template by render?

  - by brad

  I don't seem to be able to pass a variable to my partial template in rails (2.3.5). My code is as follows; In the main view .html.erb file: <% f.fields_for :payments do |payment_form| %> <%= render 'payment', {:f => payment_form, :t => "test" } %> <% end %> and in the _payment.html.erb file: <%= t %> produces a wrong number of arguments (0 for 1) error. The payment_form object is being passed to the partial as f without any problems. I've tried a number of variations on the above syntax (e.g. :locals => {:f => payment_form, :t => "test" } without success. I presume I'm doing something pretty basic wrong but just can't see it.

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• How can I dynamically call the named route in a :partial in rails?

  - by Angela

  I have the following partial. It can be called from three different times in a view as follows: <%= render :partial => "contact_event", :collection => @contacts, :locals => {:event => email} %> Second time: <%= render :partial => "contact_event", :collection => @contacts, :locals => {:event => call} %> Third time: <%= render :partial => "contact_event", :collection => @contacts, :locals => {:event => letter} %> In each instance, call, email, letter refer to a specific instance of a Model Call, Email, or Letter. Here is what I tried to do and conceptually what I'd like to do: assign the route based on the class name that has been passed to the :event from the :partial. What I did was create what the actual url should be. The 'text' of it is correct, but doesn't seem to recognize it as a named route. <% url = "skip_contact_#{event.class.name.tableize.singularize}_url" % <%= link_to_remote "Skip #{url} Remote", :url = skip_contact_email_url(contact_event, event), :update = "update-area-#{contact_event.id}-#{event.id}" % ' My challenge: skip_contact_email_url only works when the event refers to an email. How can I dynamically define skip_contact_email_url to be skip_contact_letter_url if the local variable is letter? Even better, how can I have a single named route that would do the appropriate action?

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• Searching and sorting by a float field with thinking sphinx

  - by nathan Verni

  I'm using thinking sphinx to for search on a rails app. I have a float field called 'height'. I need to be able to search this field for exact values (i.e. exactly 6.0, not 6.5). I also need to be able to sort on the field. What I have so far: indexes height, :sortable => true Problem: doesn't sort properly, returns 6.0 and 6.5 if I search for '6'

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• Render a template in Ramaze

  - by pkulak

  I've got a template for a partial that I'd like to use and I'm wondering if it's possible to just render the thing without needing to send a mock request to a controller. I'm never going to need to render this to an AJAX call, so it seems silly to set up a controller and action, not to mention the security issues with making a private partial open to the world.

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• 2 Rails Apps, 1 Database (using Heroku)

  - by Paul A.

  I've made 2 apps, App A and App B. App A's sole purpose is to allow users to sign up and App B's purpose is to take select users from App A email them. Since App A & B were created independently & are hosted in 2 separate Heroku instances, how can App B access the users database in App A? Is there a way to push certain relevant rows from App A to App B?

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• Save JSON outputed from a URL to a file

  - by Aidan

  Hey Guys, How would I save JSON outputed by an URL to a file? e.g from the Twitter search API (this http://search.twitter.com/search.json?q=hi) Language isn't important. Thanks! edit // How would I then append further updates to EOF?

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• How can I set paperclip's storage mechanism based on the current Rails environment?

  - by John Reilly

  I have a rails application that has multiple models with paperclip attachments that are all uploaded to S3. This app also has a large test suite that is run quite often. The downside with this is that a ton of files are uploaded to our S3 account on every test run, making the test suite run slowly. It also slows down development a bit, and requires you to have an internet connection in order to work on the code. Is there a reasonable way to set the paperclip storage mechanism based on the Rails environment? Ideally, our test and development environments would use the local filesystem storage, and the production environment would use S3 storage. I'd also like to extract this logic into a shared module of some kind, since we have several models that will need this behavior. I'd like to avoid a solution like this inside of every model: ### We don't want to do this in our models... if Rails.env.production? has_attached_file :image, :styles => {...}, :storage => :s3, # ...etc... else has_attached_file :image, :styles => {...}, :storage => :filesystem, # ...etc... end Any advice or suggestions would be greatly appreciated! :-)

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• RSpec - mocking a class method

  - by Chris Kilmer

  I'm trying to mock a class method with rspec: lib/db.rb class Db def self.list(options) Db::Payload.list(options) end end lib/db/payload.rb class Db::Payload def self.list(options={}) end end In my spec, I'm trying to setup the expectation Db::Payload.list will be called when I call Db.list: describe Db do before(:each) do @options = {} Db::Payload.should_receive(:list).with(@options) end it 'should build the LIST payload' do Db.list(@options) end end The problem is that I am always receiving the following error: undefined method `should_receive' for Db::Payload:Class Any help understanding this error would be most appreciated :-)

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• Sorting page flow for has_many in Rails

  - by Gareth

  I have a page flow allowing the user to choose an object ("Player") to add to a has_many :players association in another model. 1 => List existing players for object [Enter player name] 2 => List of matching players [Select player] 3 => Confirmation page [Press 'Add'] 4 => Done I want users to be able to choose "New Player" instead of selecting a player at step 2, in which case the user will go through the standard New Player process elsewhere on the site. However, after that's done, the user should return to step 3 with the new player in place. I don't know what the best way is to implement this. I don't want to duplicate the player creation code, but I don't want to dirty up the player creation code too much just for this case. I also don't want to start sticking IDs in the session if I can help it. It's fine in simple cases but if the user ever has two windows/tabs then things start behaving badly. What do you think?

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• Creating object in database without showing view to user

  - by samuil

  I have controller with action new, and I want it to create ActiveRecord::Base descendant object, and write it into database (without showing it to user). def new active_order = current_user.orders.find {|o| o.status > 0 } active_order = Order.new if active_order.nil? (...) end Order.new creates local object, but my question is -- how to make Rails to fill it with default values and write to database?

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• Rails - before_filter than includes updated object

  - by Sam

  I have a before filter than calculates a percentage that needs to include the object that is being updated. Is there a one liner in rails that takes care of this? for example and this is totaly made up: Object.find(:all, :include = :updated_object) Currently I'm sending the object that is getting updated to the definition that calculates the percentage and that works but its making things messy.

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• Polymorphic associations in Rails

  - by Newy

  Say I have two models, Apples and Oranges, and they are both associated with a description in a Text model. Text is a separate class as I'd like to keep track of the different revisions. Is the following correct? Is there a better way to do this? [Apple] has_one :text, :as => :targit, :order => 'id DESC' has_many :revisions, :class_name => 'Text', :as => :targit, :order => 'id', :dependent => :destroy [Text] belongs_to :targit, :polymorphic => true

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• Rails object based permission/authorization engine?

  - by Vlad

  Hi I want to add "Sharing documents" feature to my app, like in google documents service. As i see: User can: can list/view/create/edit/delete own documents share own document to everyone - its a public document share own document to another user with read-only access share own document to another user with read-write access view list of own documents and users to whom he gave permission to read and write view list of foreign documents view/edit foreign document with read/write permissions Please tell me, which permission/authorization solution is preffered for my task?

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• in rails, how to validate a fields which is NOT uniqueness?

  - by siulamvictor

  can i have a validation which do exactly opposite to validates_uniqueness_of? i.e. i would like to show a error message when the user input is NOT exist in database. thanks all. :)

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• Response time increasing (worsening) over time with consistent load

  - by NJ

  Ok. I know I don't have a lot of information. That is, essentially, the reason for my question. I am building a game using Flash/Flex and Rails on the back-end. Communication between the two is via WebORB. Here is what is happening. When I start the client an operation calls the server every 60 seconds (not much, right?) which results in two database SELECTS and an UPDATE and a resulting response to the client. This repeats every 60 seconds. I deployed a test version on heroku and NewRelic's RPM told me that response time degraded over time. One client with one task every 60 seconds. Over several hours the response time drifted from 150ms to over 900ms in response time. I have been able to reproduce this in my development environment (my Macbook Pro) so it isn't a problem on Heroku's side. I am not doing anything sophisticated (by design) in the server app. An action gets called, gets some data from the database, performs an AR update and then returns a response. No caching, etc. Any thoughts? Anyone? I'd really appreciate it.

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• Validate format of email in rails.

  - by piemesons

  validates_format_of :email, :with => /^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" + @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" + @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)/, :message => "is missing or invalid" Please let me know where is the problem? Is regular expression is wrong?

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• NoMethodError using Memcached Sinatra-style

  - by sevennineteen

  I've just installed Memcached on my Mac and updated my Sinatra app configuration as described in Heroku's documentation, but I'm getting a NoMethodError when trying to use the hash-based syntax they specify: >> CACHE['color'] = 'blue' >> CACHE['color'] Using explicit get and set methods as below seems to work fine. >> CACHE.set('color', 'blue') >> CACHE.get('color') If necessary I can use the latter syntax, but the former seems more elegant. I haven't tested this on Heroku's environment since I'd like whatever implementation I use to work on my local environment as well. Thanks!

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• Creating objects and referencing before saving object to db

  - by Flexo

  Sorry about the vague title, but i didnt know how to ask the question in one line :) I have an order with nested itemgroups that again have nested items. the user specify the amount of item that he would like to have in each itemgroup. I would like to create these items in the create method of the orders controller when the order itself is being created. I kinda have 2 problems here. First, how do i set the reference of the items, or better yet, put the items into the @order object so they are saved when the @order is saved? the items are being stored in the db as the code is now, but the reference is not set because the order is not stored in the db yet so it doesnt have an id yet. Second, im not sure im using the correct way to get the id from my itemgroup. @order = Order.new(params[:order]) @order.itemgroups.each do |f| f.amount.times do @item = Item.new() @item.itemgroup_id = f.id @item.save end end

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