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• Online audio stream using ruby on rails

  - by Avdept

  I'm trying to write small website that can stream audio online(radio station) and got few questions: 1. Do i have to index all my music files into database, or i can randomily pick file from file system and play it. 2. When should i use ajax to load new song(right after last finished, or few seconds before to get responce from server with link to file?) 3. Is it worth to use ajax, or better make list, that will play its full time and then start over?

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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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• Accessing the params hash for year and month rails and using in helper

  - by Matt

  So I took some php code and turned it into a calendar with a helper to make a simple calendar. I got my data from inside the helper: def calendar_maker a = Time.now b = a.month d = a.year h = Time.gm(d,b,1) #first day of month Now I want to try and do it with parameters within my method #from the helper file def calendar_maker(year, month) a = Time.now b = month c = year h = Time.gm(d,b,1) #first day of month #from my html.erb file <%= @month %> and <%= @year %> <%= params["month"] %><br /> <%= params["action"] %><br /> <%= params["year"] %><br /> <%= calendar_maker( @year, @month) %> #from controller file def calendar @month = params[:month] @year = params[:year] end Anyways mistakes were made and not finding documentation anywhere or not looking in the right place. How do I get this to work with my params hash. Thanks for the help.

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• Rails time zone selector: intelligently selecting a default

  - by Tim Sullivan

  When signing up for an account on one of my apps, we need to store the time zone is in. We're using the time zone selector, which is fine, but I'd like to set the default value to something that it likely the user's current time zone. Is there an easy way, either on the server or using JavaScript, to set the time zone selector to the time zone the user is currently in?

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• Execute script with Ruby on Rails?

  - by yuval

  I want to start my daemon with my application. In the command line, I can write something like lib/daemons/mydaemon_ctl start to start up my daemon, but I have to do this manually. I want the daemon to start when I start my server (i.e. when the initializer files are loaded). Is there a ruby command for executing a command line? Something like exec "lib/daemons/mydaemon_ctl start"? Thanks!

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• What caused the rails application crash?

  - by so1o

  I'm sure someone can explain this. we have an application that has been in production for an year. recently we saw an increase in number of support requests for people having difficulty signing into the system. after scratching our head because we couldn't recreate the problem in development, we decided we'll switch on debug logger in production for a month. that was june 5th. application worked fine with the above change and we were waiting. then yesterday we noticed that the log files were getting huge so we made another change in production config.logger = Logger.new("#{RAILS_ROOT}/log/production.log", 50, 1048576) after this change, the application started crashing while processing a particular file. this particular line of code was RAILS_DEFAULT_LOGGER.info "Payment Information Request: ", request.inspect as you can see there was a comma instead of a plus sign. this piece of code was introduced in Mar. the question is this: why did the application fail now? if changing the debug level caused the application to process this line of code it should have started failing on june 5th! why today. please someone help us. Are we missing the obvious here? if you dont have an answer, at least let us know we aren't the only one that are bonkers.

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• Obtain the stored values of a modified Rails model object

  - by J. Pablo Fernández

  Is there a way to obtain the stored value, that is, the one in the database once the instance has been modified? The problem I'm trying to solve is get the stored slug of an object that failed to save to be able to regenerate the URL.

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• Drawing information from relational databases in Rails

  - by Trip

  I am trying to pull the name of the Artist from the Albums database. These are my two models class Album < ActiveRecord::Base belongs_to :artist validates_presence_of :title validates_length_of :title, :minimum => 5 end class Artist < ActiveRecord::Base has_many :albums end And here is the Albums Controller def index @ albums = Album.all respond_to do |format| format.html # index.html.erb format.xml { render :xml => @albums } end end And the View from the index: <% @albums.each do |album| %> <tr> <td><%=h album.id %></td> <td><%=h album.title %></td> <td><%=h album.artist.name %></td> </tr <% end %> My end result html is coming out like this for the artist field! # and if i set it to artist.name I get this: undefined method `name' for nil:NilClass

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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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• (Rails) Assert_Select's Annoying Warnings

  - by CalebHC

  Does anyone know how to make assert_select not output all those nasty html warnings during a rake test? You know, like this stuff: .ignoring attempt to close body with div opened at byte 1036, line 5 closed at byte 5342, line 42 attributes at open: {"class"=>"inner02"} text around open: "</script>\r\t</head>\r\t<body class=\"inner02" text around close: "\t</div>\r\t\t\t</div>\r\t\t</div>\r\t</body>\r</ht" Thanks

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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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• Only show non blank attributes for a model in views in Rails

  - by Senthil

  Say I've a user model and there are bunch of user info, like email, birthdate, location, telephone number etc. What's the simplest way of hiding the attributes that are blank? I've doing something like <% if blog.title.empty? -%> <p>Body: <%=h blog.body %></p> <p>Comments: <%=h blog.comments %></p> <% elsif blog.body.empty? %> <p>Title: <%=h blog.title %></p> <p>Comments: <%=h blog.comments %></p> <% else -%> <p>Title: <%=h blog.title %></p> <p>Body: <%=h blog.body %></p> <% end -%> Clearly that is one ugly child. Other than using partials to render, is there a trick to only show non blank fields? I've been trying to write a helpher method to make the view cleaner, but that's even more ugly. Any help is appreciated.

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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: 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 user authentication using linux passwd file?

  - by kdt

  Hi, Is there an authentication plugin for rails which uses the host system's /etc/passwd file to provide user/password information? The goal is to provide user login to a rails app for the same users who already have local login accounts to the linux machine hosting the rails app. Cheers.

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• Ruby on Rails: Converting "SomeWordHere" to "some word here"

  - by sjsc

  I know you can do something like: "SomeWordHere".underscore.gsub("_", " ") to get "some word here". I thought that might be a little too much for something so simple. Is there a more efficient way (maybe a built-in method?) to convert "SomeWordHere" to "some word here"?

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• Rails: Different prices for different branches, association depending on two other models combined

  - by Greg Lemond

  I have three models: Service has_many :prices has_many :groups, through: prices Price belongs_to :service belongs_to :group Group has_many :prices I want to have an input field (Simple_Form) for every price. In views/services/_form.html.haml I do: simple_form_for @service do |f| simple_fields_for :groups do |g| simple_fields_for :prices do |p| p.input :price With this setup I only get input fields for already saved prices. How I can get a price field for every group? I tried to do it manually, but it got really nasty and didn't work either. Thanks for any ideas!

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• Rails "Missing these required gems" error for installed gems

  - by Shpigford

  I know this has been asked multiple times before, but I've tried those things and still am not having any luck. For the mechanize gem, I keep getting the "Missing these required gems" error when I run db:migrate on my production server. Here's the full error: Missing these required gems: mechanize You're running: ruby 1.8.6.111 at /usr/bin/ruby1.8 rubygems 1.3.5 at /home/user/.gem/ruby/1.8, /usr/lib/ruby/gems/1.8 Output of which ruby is /usr/bin/ruby Output of which gem is /usr/bin/gem When I run gem list mechanize (1.0.0) is definitely in the list. What am I doing wrong here?

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• Where to put to_xls and from_xls in a rails app

  - by Joe Arasin

  So I have a model that I need to be able to serialize to/read from an Excel(XLS) document. I am a bit of a loss as to where this code actually belongs. My initial thought is that the to_xls is a view, but after poking around and seeing things like (to|from)_xml and (to|from)_json in ActiveRecord, I was wondering if maybe this stuff belonged in the model. Alternatively, does it belong in just a whole separate container somewhere? For what it's worth, users will be downloading models from the site, modifying them in excel, then posting them.

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• rails error on create action

  - by ash34

  SQL (2.0ms) SELECT task_report_requests_seq.NEXTVAL id FROM dual TaskReportRequest Create (2.2ms) INSERT INTO task_report_requests (location, created_at, updated_at, id, freq, login, task_dt) VALUES('020', TO_DATE('2010-05-25 05:02:38','YYYY-MM-DD HH24:MI:SS'), TO_DATE('2010-05-25 05:02:38','YYYY-MM-DD HH24:MI:SS'), 10023, 'M', NULL, TO_DATE('2010-05-30 00:00:00','YYYY-MM-DD HH24:MI:SS')) NoMethodError (You have a nil object when you didn't expect it! The error occurred while evaluating nil.call): app/controllers/task_report_requests_controller.rb:45:in `create' It says error evaluating nil.call . Can someone tell me when I would get such an error. I am not able to figure out with this information. thanks, ash

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• What exactly is Arel in Rails 3.0?

  - by Will

  I understand that it is a replacement for ActiveRecord and that it uses objects instead of queries. But... why is this better? will objects/queries be "easier" to create? will it lead to more efficient SQL queries? will it be compatible with all major DB's? - I assume it will. will it be easier/harder to use with stored procedures?

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• Rails: using find method to access joined tables for polymorphic relationships

  - by DJTripleThreat

  Ok, I have a generic TimeSlot model that deals with a start_at and an end_at for time spans. A couple models derive from this but I'm referring to one in this question: AppointmentBlock which is a collection of Appointments. I want to validate an AppointmentBlock such that no other AppointmentBlocks have been scheduled for a particular Employee in the same time frame. Since AppointmentBlock has a polymorphic association with TimeSlot, you have to access the AppointmentBlock's start_at and end_at through the TimeSlot like so: appt_block.time_slot.start_at This means that I need to have some kind of join in my :conditions for my find() method call. Here is my code so far: #inside my appointment_block.rb model validate :employee_not_double_booked def employee_not_double_booked unless self.employee_id # this find's condition is incorrect because I need to join time_slots to get access # to start_at and end_at. How can I do this? blocks = AppointmentBlock.find(:first, :conditions => ['employee_id = ? and (start_at between ? and ? or end_at between ? and ?)', self.employee_id, self.time_slot.start_at, self.time_slot.end_at, self.time_slot.start_at, self.time_slot.end_at]) # pseudo code: # collect a list of appointment blocks that end after this # apointment block starts or start before this appointment # block ends that are also associated with this appointment # blocks assigned employee # if the count is great then 0 the employee has been double # booked. # if a block was found that means this employee is getting # double booked so raise an error errors.add "AppointmentBlock", "has already been scheduled during this time" if blocks end end Since AppointmentBlock doesn't have a start_at or an end_at how can I join with the time_slots table to get those conditions to work?

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• Rails 3) Delete, Destory, and Routing

  - by Maximus S

  The problem is the code below <%= button_to t('.delete'), @post, :method => :delete, :class => :destroy %> My Post model has many relations that are dependent on delete. However, the code above will only remove the post, leaving its relations intact. The problem is that methods delete and destroy are different in that method delete doesn't instantiate the object. So I need to use "destroy" instead of "delete" my post. <%= button_to t('.delete'), @post, :method => :destroy %> gives me routing error. No route matches [POST] "/posts/2" <%= button_to t('.delete'), @post, Post.destroy(@post) %> deletes the post without clicking the button. Could anyone help me with this? UPDATE: application.js //= require jquery //= require jquery-ui //= require jquery_ujs //= require bootstrap-modal //= require bootstrap-typeahead //= require_tree . rake routes DELETE (/:locale)/posts/:id(.:format) posts#destroy Post model has_many :tag_links, :dependent => :destroy has_many :tags, :through => :tag_links Tag model has_many :tag_links, :dependent => :destroy has_many :posts, :through => :tag_links Problem: When I delete a post, all the tag_links are destroyed but tags still exist.

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