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• Redirecting all page queries to the homepage in Rails

  - by Dean Putney

  I've got a simple Rails application running as a splash page for a website that's going through a transition to a new server. Since this is an established website, I'm seeing user requests hitting pages that don't exist in the Rails application. How can I redirect all unknown requests to the homepage instead of throwing a routing error?

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• Rails form helpers: how to add an element to a collection?

  - by Laran Evans

  I have a keychain object. keychain has_many credentials. I'm trying to write the view code to add a new credential to a keychain. This is the code I have: <% form_for(@keychain) do |f| % <tr <td<%= f.select "credentials[]", current_account.services.collect{ |s| [s.friendly_name, s.id] } %</td <td<%= f.text_field 'credentials', :username %</td <td<%= f.password_field 'credentials', :password %</td </tr <% end % But it fails with this message: NoMethodError in Keychains#new Showing app/views/keychains/_keychain_form.html.erb where line #32 raised: undefined method `credentials[]' for # What am I doing wrong?

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• saving nested attributes

  - by Victor Martins

  I have a form that has a nested form like this: <%- for subscription in @task.subscriptions -% <%- semantic_fields_for "task[subscription_attributes][]", subscription do |subscription_form|% <%- subscription_form.inputs do -% <%= subscription_form.input :workhours, :label = subscription.user.full_name% <%- end -% <%- end -% <%- end -% And on the task model I have: accepts_nested_attributes_for :subscriptions attr_accessible :mission_id, :statuscode_id, :name, :objectives, :start_at , :end_at, :hours, :testimony ,:subscriptions_attributes In the form (view) I get the correct values on the workhours fields. But when I change the values and hit the submit button, the values are never changed. I can't figure out why...

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• Find most common string in an array

  - by j.

  I have this array, for example (the size is variable): x = ["1.111", "1.122", "1.250", "1.111"] and I need to find the most commom value ("1.111" in this case). Is there an easy way to do that? Tks in advance!

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• has_many through and partials

  - by user307428

  I have a User model, a Post model, and an Interest model. Using User has_many posts through interests Using User has_many interests Using Post has_many users through interests Using Post has_many interests Using Interest belongs to Post Using Interest belongs to User Application_Controller is as follows: class ApplicationController < ActionController::Base before_filter :login_from_cookie before_filter :find_user_interests helper :all # include all helpers, all the time session :session_key = '_blah_session' include AuthenticatedSystem def find_user_interests @user_interests = current_user ? current_user.interests : [] true end Application.html.erb has as follows: <%= render :partial = "users/interests", :object = @user_interests % _interests.html.erb partial is as follows: ul <% unless current_user.nil? then -% <% @user_interests.each do |interest| -% li<%= interest.post.title %/li <% end % <% end -% /ul Given all this when I at localhost:3000/posts/1 my partial shows up fine, but when in localhost:3000/posts I get an error "undefined method `title' for nil:NilClass" thus an error in the line li<%= interest.post.title %/li shown above in the _interests.html.erb partial. What the heck would be the issue? TIA end

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• rails controller defaults to respond with application/xml in production

  - by Dave Paroulek

  I have a standard contacts_controller.rb with index action that responds as follows: respond_to do |format| format.html format.xml { render :xml => @contacts } end In development, it works as intended: when I browse to http://localhost:3000/contacts, I get an html response. But, when I start the app using capistrano on a remote Ubuntu server and browse to the same url, I get an xml response. If I go to http://remote_host:8000/contacts.html, then I see the html response. If I comment out the format.xml { render :xml => @contacts }, then I see the desired html response. Pretty sure I'm missing something subtle about difference between Rails development and production modes. Any ideas about what I'm overlooking? Thanks, - Dave

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• How can I render a transparent gradient with RMagick?

  - by kelly

  Want to use RMagick to create a PNG image of a gradient that goes from rgba(0,0,0,0.3) to rgba(0,0,0,0.7). Is this possible?

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• how to model editing of multiple related resources on the same webpage?

  - by amikazmi

  Lets say we have a Company model, that has many Employees And has many Projects If we want to show the projects, we'll go to "/company/1/projects/index" If we want to edit 1 project, we'll go to "/company/1/projects/1/edit" What if we want to edit all the projects at once on the same webpage? We can go to "/company/1/edit" and put a nested forms for all the projects But what if we need a different webpage to edit all the employees at once too? We can't use "/company/1/edit" again.. Right now we do "/company/1/projects/multiedit", "/company/1/projects/multupdate"- but as you can see, it's not rest. How can we model this restfully?

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• jruby/activerecord-jdbc/tomcat/DB2 ready for enterprise?

  - by arkadiy

  I am trying to introduce RoR to my company and I have two ways of doing so in my mind: (1) rails/ibm_db2/passenger/DB2 - which is my preferable way but it is not really supported by company's infrastructure. (2) jruby/activerecord-jdbc/tomcat/DB2 - probably easier way to migrate relying on current infrastructure and java libs IF I have a proof this is an enterprise ready technology. Does anyone know if there is any prof that jruby/aciverecord-jdbc-adapter/DB2/tomcat is mature enough for production? Are there any problems I should know about during Development/Deployment/Runtime? My webapp is for a company intranet, around 200~400 active users.

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• can rails send data to browser chunk by chunk?

  - by Nik

  Hello all, I have a very large dataset (100,000) to be display, but any browser I tried that on including chrome 5 dev, it make them choke for dozens of seconds (win7 64bit, 4gb, 256gb ssd, c2duo 2.4ghertz). I did a little experiment by some_controller.rb def show @data = (1..100000).to_a end show.html.erb <% @data.each do |d| % <%= d.to_s % <% end% as simple as that it chokes the browsers. I know browsers were never built for this, so I thought to let the data come in chunk by chunk, I guess 2000 per chunk is reasonable, but I wouldn't want to make 50 requests each time this view is called, any ideas? It doesn't have to be chunk by chunk if it can be sent all at once. Best,

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• rails: has_many :through + polymorphism validation?

  - by ramonrails

  I am trying to achieve this. Any hints? A project has many users through join model A user has many projects through join model Admin class inherits User class. It also has some Admin specific stuff. Admin like inheritance for Supervisor and Operator Project has one Admin, One supervisor and many operators. Now I want to 1. submit data for project, admin, supervisor and operator in a single project form 2. validate all and show errors on the project form. Project has_many :users, :through = :projects_users User has_many :projects, :through = :projects_users ProjectsUser = :id integer, :user_id :integer, :project_id :integer, :user_type :string ProjectUser belongs_to :project, belongs_to :user, :polymorphic = true Admin < User Supervisor < User Operator < User Is the approach correct? Any and all suggestions are welcome.

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• Where does 'color_puts' come from?

  - by Kyle

  I can't find where the color_puts would come from in the mod_passenger installer... any ideas?

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• How do I create a point system in a Rails app that assigns points to users and non-authenticated-use

  - by codyvbrown

  I'm building a question and answer application on top of twitter and I'm hitting some snags because I'm inevitably dealing with two classes of users: authenticated and non-authenticated. The site enable users to give points to other users, who may or may not be authenticated, and I want to create a site-wide point system where the application stores and displays this information on their profile. I want to save this point data to the user because that would be faster and more efficient but non-authenticated users aren't in our system, we only have the twitter handle. So instead we display the points in our system like this: @points = point.all( :select => "tag, count(*) AS count", # Return tag and count :group => 'tag', # Group by the tag :order => "2 desc", :conditions => {:twitter_handle => params[:username]}) Is there a better way to do this? Is there a better way to associate data with non-authenticated users?

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• current_user.user_type_id = @employer ID

  - by sscirrus

  I am building a system with a User model (authenticated using AuthLogic) and three user types in three models: one of these models is Employer. Each of these three models has_many :users, :as = :authenticable. I start by having a new visitor to the site create their own 'User' record with username, password, which user type they are, etc. Upon creation, the user is sent to the 'new' action for one of the three models. So, if they tell us they are an employer, we redirect_to :controller = "employers, :action = "new". Question: When the employer has submitted, I want to set the current_user.user_type_id equal to the employer ID. This should be simple... but it's not working. # Employers Controller / new def new @employer = Employer.new 1.times {@employer.addresses.build} render :layout => 'forms' end # Employers Controller / create def create @employer = Employer.new(params[:employer]) if @employer.save if current_user.blank? redirect_to :controller => "users", :action => "new" else current_user.user_type_id = @employer.id current_user.user_type = "Employer" redirect_to :action => "home", :id => current_user.user_type_id end else render :action => "new" end end ------UPDATE------ Hi guys. In response: I am using this table structure because each of my three user type models have lots of different fields and each has different relationships to the other models, which is why I've avoided STI. By 1.times (@employer.addresses.build) I'm connecting the employer model to the address polymorphic table in one form, so I'm asking the controller to build a new address to go along with the new employer. Averell: you mentioned encapsulating... something in the model using a 'setter' method. I have no idea what you mean by this - could you please explain how this works (or direct me to an example elsewhere)? With tsdbrown's answer I have managed to create the behavior I want... if there's a more elegant way to accomplish the same thing I'd love to learn how. Thanks very much. Thanks to tsdbrown for answering the current_user.save problem!

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• Read from params[] in Rails

  - by Adnan

  Hi, I use: <%= select( "payment", "id", { "Visa" => "1", "Mastercard" => "2"}) %> and I get this in HTML <select id="payment_id" name="payment[id]"><option value="2">Mastercard</option> <option value="1">Visa</option></select> now how can I read the payment[id] with params[], if I use params[payment[id]] I get an error.

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• Schema for storing "binary" values, such as Male/Female, in a database

  - by latentflip

  Intro I am trying to decide how best to set up my database schema for a (Rails) model. I have a model related to money which indicates whether the value is an income (positive cash value) or an expense (negative cash value). I would like separate column(s) to indicate whether it is an income or an expense, rather than relying on whether the value stored is positive or negative. Question: How would you store these values, and why? Have a single column, say Income, and store 1 if it's an income, 0 if it's an expense, null if not known. Have two columns, Income and Expense, setting their values to 1 or 0 as appropriate. Something else? I figure the question is similar to storing a person's gender in a database (ignoring aliens/transgender/etc) hence my title. My thoughts so far Lookup might be easier with a single column, but there is a risk of mistaking 0 (false, expense) for null (unknown). Having seperate columns might be more difficult to maintain (what happens if we end up with a 1 in both columns? Maybe it's not that big a deal which way I go, but it would be great to have any concerns/thoughts raised before I get too far down the line and have to change my code-base because I missed something that should have been obvious! Thanks, Philip

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• How do I model a has_many :through and with aggregation in Rails?

  - by Angela

  How do I model having multiple Addresses for a Company and assign a single Address to a Contact? Contacts belong_to a Company. A Company has_many Contacts. A Company also has_many Addresses. And each Contact belongs_to an Address. How do I model this? I have Model/Contacts.rb belong_to :Company belong_to :Address (?) Model/Company.rb has_many :Contacts has_many :Addresses Address is an aggregation of :street1, :street2, :city, :state, :zip so not clear exactly what to do there. So what would I do in my _form so that when I have a contact/new I am able to either default to a main address or select one of the others? If none of them match, adding for a Contact makes that address available to any subsequent contact?

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• Searching pgadmin db and grabbing information?

  - by Bootstrotter

  I'm currently trying to write a script in RoR to go into my PGAdmin database and look at a list of users, THEN ignore users that have an image path but look at users who don't have one and then upload a link of a generic photo into their row. My database looks Something like this: id integer | name | email | image path | 12 Bob [email protected] www.faces.org 81 Sally [email protected] 114 Mark [email protected] www.faces.org How would I start grabbing those users, I only have 103 users right now, but I also need to think about scaling for the future. Here is a starting point. I know this is kind of vague but really all I need is just a starting point. to get into it. Thanks for the information. require 'sqlite3' db = SQlite3 users = users.find([1, 103]) Any help would be great.

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• Unable to read values from object returned from ActiveRecord.find

  - by Venki

  I make the following call to the DB. @patientRegistration = PatientRegistration.find(:all, :conditions=["name = '#{patientName}'"]) Search for patient registration based on a given name. I get a valid @patientRegistration object.When I invoke @patientRegistration.inspect it prints correctly all the values for the object in the DB. But when I try to read a particular attribute (Say id or name) by doing the following: @patientRegistration.id or @patientRegistration.name. I get invalid values. Either its blank or some junk values. I dont understand how inspect is able to retrieve all the values correctly but reading individual attributes gives invalid values. Thanks

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• Slow Client connection blocks Mongrel

  - by Sanjay

  I have a Apache + Haproxy + Mongrel setup for my rails application. When I hit a particular server page, mongrel takes around 100ms to process the request and I get the page in around 5 secs due to data transmission time on my slow home connection. Now I see that during these 5 secs of data transmission, mongrel does not serve any other request. I am surprised as that means mongrel is serving the response html to the client and is blocked till the client receives it. Shouldn't serving response be the job of Apache? This puts serious bottleneck in the no of requests Mongrel can serve as that would depend on the speed of the client connection. Is there any way that html generated by mongrel is served by apache/haproxy or any other web server like nginx? I wonder how the other high traffic sites are managing it?

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• Can I retrieve objects from a complex query that limits results to fields from a single table?

  - by Sean Redmond

  I have a model whose rows I always want to sort based on the values in another associated model and I was thinking that the way to implement this would be to use set_dataset in the model. This is causing query results to be returned as hashes rather than objects, though, so none of the methods from the class can be used when iterating over the dataset. I basically have two classes class SortFields < Sequel::Model(:sort_fields) set_primary_key :objectid end class Items < Sequel::Model(:items) set_primary_key :objectid one_to_one :sort_fields, :class => SortFields, :key => :objectid end Some backstory: the data is imported from a legacy system into mysql. The values in sort_fields are calculated from multiple other associated tables (some one-to-many, some many-to-many) according to some complicated rules. The likely solution will be to just add the values in sort_fields to items (I want to keep the imported data separate from the calculated data, but I don't have to). First, though, I just want to understand how far you can go with a dataset and still get objects rather than hashes. If I set the dataset to sort on a field in items like so class Items < Sequel::Model(:items) set_primary_key :objectid one_to_one :sort_fields, :class => SortFields, :key => :objectid set_dataset(order(:sortnumber)) end then the expected clause is added to the generated SQL, e.g.: >> Items.limit(1).sql => "SELECT * FROM `items` ORDER BY `sortnumber` LIMIT 1" and queries still return objects: >> Items.limit(1).first.class => Items If I order it by the associated fields though... class Items < Sequel::Model(:items) set_primary_key :objectid one_to_one :sort_fields, :class => SortFields, :key => :objectid set_dataset( eager_graph(:sort_fields). order(:sort1, :sort2, :sort3) ) end ...I get hashes ?> Items.limit(1).first.class => Hash My first thought was that this happens because all fields from sort_fields are included in the results and maybe if selected only the fields from items I would get Items objects again: class Items < Sequel::Model(:items) set_primary_key :objectid one_to_one :sort_fields, :class => SortFields, :key => :objectid set_dataset( eager_graph(:sort_fields). select(:items.*). order(:sort1, :sort2, :sort3) ) end The generated SQL is what I would expect: >> Items.limit(1).sql => "SELECT `items`.* FROM `items` LEFT OUTER JOIN `sort_fields` ON (`sort_fields`.`objectid` = `items`.`objectid`) ORDER BY `sort1`, `sort2`, `sort3` LIMIT 1" It returns the same rows as the set_dataset(order(:sortnumber)) version but it still doesn't work: >> Items.limit(1).first.class => Hash Before I add the sort fields to the items table so that they can all live happily in the same model, is there a way to tell Sequel to return on object when it wants to return a hash?

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• Sinatra: How do I provide access to a login form while preventing access to the rest of my Sinatra a

  - by Brandon Toone

  I recently created a Sinatra app with a login form (no basic auth). To prevent access to the app unless the user logged in I put a before block in place before do unless request.path_info == '/login' authenticated? end end I quickly realized that this prevented me from accessing resources in the public directory like my style sheet and logo unless authenticated first as well. To get around that I changed my filter to the following: before do unless request.path_info == '/login' || request.path_info == "/stylesheets/master.css" || request.path_info == "/images/logo.png" authenticated? end end If there were lots of resources I needed to provide exceptions to this way of making them would quickly become overwhelming. What is a better way to code this so I can make exceptions for the public directory or even its specific sub-directories and files like /stylesheets, /images, /images/bg.png but not /secret or /secret/eyes-only.pdf? Or ... Is there a completely different best-practice to handle this situation of locking down everything except the stuff related to logging in (handlers, views, resources)?

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• How to set the URL of a link to a variable using WATIR

  - by Alex

  Using WATIR and Excel, I'd like to take the first row of a table in Excel, visit the URL, then set the 12th link on the page as a variable in the cell next to the cell with the URL, then go to the next line and repeat. I'm stuck on getting the URL of the 12th link on the page to set as a variable that I can feed into the next cell in Excel. Here's what I have and it's not working. worksheet = workbook.WorkSheets(1) # get first workbook #declare test site test_site = worksheet.Range("a2").text #open ie ie = Watir::IE.new #go to test_site ie.goto test_site #find primlink ie.link(:index, 12).text = "primlink" puts primlink Any ideas?

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• What would you use for auto completion in Rails app?

  - by Andrei

  I want to use auto-completion in a number of fields (5-7) in my forms. There is a screencast on auto-completion with Prototype library by Ryan Bates ( http://railscasts.com/episodes/102-auto-complete-association). On the other hand, I have noticed that quite many guys suggest jQuery for this task ( http://jquery.bassistance.de/autocomplete/demo/). And I guess, there was probably some development last year(s), so I ask you - what would you use nowadays to auto-complete your form fields and why? BTW, I still have an open question on auto completion for HABTM association: http://stackoverflow.com/questions/1510935/how-to-do-habtm-management-with-auto-completion-in-rails

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• Should frontend and backend be handled by different controllers?

  - by DR

  In my previous learning projects I always used a single controller, but now I wonder if that is good practice or even always possible. In all RESTful Rails tutorials the controllers have a show, an edit and an index view. If an authorized user is logged on, the edit view becomes available and the index view shows additional data manipulation controls, like a delete button or a link to the edit view. Now I have a Rails application which falls exactly into this pattern, but the index view is not reusable: The normal user sees a flashy index page with lots of pictures, complex layout, no Javascript requirement, ... The Admin user index has a completly different minimalistic design, jQuery table and lots of additional data, ... Now I'm not sure how to handle this case. I can think of the following: Single controller, single view: The view is split into two large blocks/partials using an if statement. Single controller, two views: index and index_admin. Two different controllers: BookController and BookAdminController None of these solutions seems perfect, but for now I'm inclined to use the 3rd option. What's the preferred way to do this?

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