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  • ruby on rails named scopes (searching)

    - by houlahan
    I have a named scope (name) combination of first and last name and I'm wanting to use this in a search box. I have the code below: named_scope :full_name, lambda { |fn| {:joins => :actor, :conditions => ['first_name LIKE ? OR second_name LIKE ?', "%#{fn}%", "%#{fn}%"]} } def self.search(search) if search self.find(:all, :conditions => [ 'full_name LIKE ?', "%#{search}%"]) else find(:all) end end but this doesn't work as it gives the following error: SQLite3::SQLException: no such column: full_name: SELECT * FROM "actors" WHERE (full_name LIKE '%eli dooley%') Thanks in advance Houlahan

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  • Strange ruby syntax

    - by AntonAL
    Hi, what the syntax is in Action Mailer Basics rails guide ? class UserMailer < ActionMailer::Base def welcome_email(user) recipients user.email from "My Awesome Site Notifications <[email protected]>" subject "Welcome to My Awesome Site" sent_on Time.now body {:user => user, :url => "http://example.com/login"} end end How should i understand the construction, like from "Some text for this field" Is it an assignment the value to a variable, called "from" ?

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  • Calculate sum of objects for each unique object property in Ruby

    - by macek
    I was helping with an answer in this question and it sparked a question of my own. Pie is an object that has a pieces array made of of PiePiece objects. Each PiePiece has a flavor attribute How do I create a hash that looks like this: # flavor => number of pieces { :cherry => 3 :apple => 1 :strawberry => 2 } This works, but I think it could be improved def inventory hash = {} pieces.each do |p| hash[p.flavor] ||= 0 hash[p.flavor] += 1 end hash end Any ideas?

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  • Difference between local and instance variables in ruby

    - by fflyer05
    I am working on a script that creates several fairly complex nested hash datastructures and then iterates through them conditionally creating database records. This is a standalone script using active record. After several minutes of running I noticed a significant lag in server responsiveness and discovered that the script, while being set to be nice +19, was enjoying a steady %85 - %90 total server memory. In this case I am using instance variables simply for readability. It helps knowing what is going to be re-used outside of the loop vs. what won't. Is there a reason to not use instance variables when they are not needed? Are there differences in memory allocation and management between local and instance variables? Would it help setting @variable = nil when its no longer needed?

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  • Ruby ActiveRecord + Mongrel going slow

    - by stel
    I have a class like this: class Router :: Mongrel::HttpHandler def process(req, res) status, header, body = [200, {"Content-type"="text/html"}, Model.all.to_xml] res.start(status) do |head, out| header.each_pair { |key, value| head[key] = value } out.write body end end end It's an server and I use an ActiveResource front end on the other side. Every 3rd request is very slow (about 5 seconds, 1st and 2nd is ok, about 0.01 sec). The problem in Model.all.to_xml (it is ActiveRecord - SQLite). Why it is too slow? It only happens when I use it in Mongrel::HttpHandler.. This 100.times do a = Time.now Car.all.to_xml puts "#{Time.now - a}" sleep(1) end is always works good.

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  • What are :+ and &+ in ruby?

    - by Valentin Vasilyev
    I've seen these several times but I can't figure out how to use them. The pickaxe says that these are special shortcuts but I wasn't able to find the syntactical description. I've seen them in such contexts: [1,2,3].inject(:+) to calculate sum for example.

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  • ruby on rails- nested attributes for 'has_one' relationship

    - by Kum
    Hello, I need some help concerning nested attributes in models with 'has_one' relationship. Model Survey has 1 question Model Question has 1 answer How do i build the 'answer' in the code below def new @survey = Survey.new @survey.build_question # build one question @survey.question.answer.build #this part is not working end Please can anybody tell me how to build the answer as the code "@survey.question.answer.build" is not correct. Many many thanks for your help

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  • ruby code inside quotes

    - by chief
    I would like to embed videos and have managed to to do so by manually coding the url in where needed. If my url is stored in <%= @vid.url %, how can I use that string for the value and src parameter? <object width="480" height="385"><param name="movie" value="http://www.youtube.com/videos/abc123"></param><param name="allowFullScreen" value="true"></param><param name="allowscriptaccess" value="always"></param><embed src="http://www.youtube.com/videos/abc123" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385"></embed></object>

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  • Problems parsing Google Data Booksearch API XML in Ruby

    - by FrogBot
    I'm trying to parse some XML I've gotten from the Google Data Booksearch API and I'm having trouble trying to target a specific element. Currently my code looks like so: require 'gdata' client = GData::Client::BookSearch.new feed = client.get("http://books.google.com/books/feeds/volumes?q=Foundation").to_xml books = [] feed.elements.each('entry') do |entry| book = { :title => entry.elements['title'].text, :author => entry.elements['dc:creator'].text, :book_id => entry.elements['dc:identifier'].text } books.push(book) end p books and that all works fine, but I want to add a thumbnail URL to the book hash. The tag with each book's thumbnail URL looks like so: <feed> <entry> ... <link rel="http://schemas.google.com/books/2008/thumbnail" type="image/x-unknown" href="http://bks6.books.google.com/books?id=ID5P7xbmcO8C&printsec=frontcover&img=1&zoom=5&edge=curl&source=gbs_gdata"/> ... </entry> </feed> I want to grab the contents of the href attribute from this element and I'm not exactly sure how. Can anyone help me out here?

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  • Ruby On Rails -

    - by Adam S
    I am trying to create a collection_select that is dependent on another collection_select, following the railscasts episode #88.. The database includes a schedule of all cruise ships arrival dates. See attached schema diagram,... (The arrow side of the lines indicate has_many, the non-pointy side indicates belongs_to) In the "booking/new" view I have a collection_select for choosing a cruiseline, then another collection_select will appear for selecting a ship, then another for selecting the date that ship is in. If I ONLY put a collection_select for shipshedule it works fine(because of the direct association with the bookings model). However, if I try to add a collection_select for cruiselines....it breaks(Im assuming because their isnt a direct association). The collection_select for cruiselines returns an undefined method error for "cruiseline_id".....if I simply use "id" the collection_select works, but of course isnt fully functional due to incorrect naming of the form field. I have tried "has_many :shipschedules, :through = :cruiseships" in the cruiseline model and "has_many :bookings, :through = :shipschedules" in the cruiseships model... As you can see in the diagram, I need to access the cruiseships and cruiselines model through the bookings model. I have the models set up so a cruiseline has_many cruiseships, a cruiseship has_many shipschedules, and a shipschedule has_many bookings. But, the bookings model cant directly access the cruiseline model. How do I accomplish this? THANKS!!! http://www.adamstockland.com/common/images/RoRf/PastedGraphic-2.png http://www.adamstockland.com/common/images/RoRf/PastedGraphic-1.png

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  • Chaining your own method in Ruby on Rails

    - by steven_noble
    In my Rails app, I am used to using syntax like the following in a number of places, including helpers/application_helper.rb: def my_method(x,y) return x+y end I am also used to calling the resulting method from basically anywhere in my app using syntax like this: my_method(2,3) However, I'd like to be able to use syntax like like this: class_from_my_rails_app.my_method(3) How and where do I define my_method so I can use it like this? I'm happy to consult the documentation, but I just don't know what the latter style is called. What do you call it? Many thanks, Steven.

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  • Access Ruby on Rails 'public' directory without relative path

    - by huntca
    I have a flash object I wish to load and I belive the best place to store that asset is in the public directory. Suppose it's stored in public/flash, there must be a better way to path to the swf than what I've done below. Note the 'data' element, it has a relative path. def create_vnc_object haml_tag :object, :id => 'flash', :width => '100%', :height => '100%', :type => 'application/x-shockwave-flash', :data => '../../flash/flash.swf' do haml_tag :param, :name => 'movie', :value => '../../flash/flash.swf' end end Is there some rails variable that points to public?

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  • How does Ruby's Array.| compare elements for equality?

    - by Max Howell
    Here's some example code: class Obj attr :c, true def == that p '==' that.c == self.c end def <=> that p '<=>' that.c <=> self.c end def equal? that p 'equal?' that.c.equal? self.c end def eql? that p 'eql?' that.c.eql? self.c end end a = Obj.new b = Obj.new a.c = 1 b.c = 1 p [a] | [b] It prints 2 objects but it should print 1 object. None of the comparison methods get called. How is Array.| comparing for equality?

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  • Ruby: What's going on here?

    - by user204078
    This question is based off some really odd code I recently found in a colleagues work. He claims not to know how it works only he copied it from somewhere else. That's not good enough for me I want to understand what's going on here. Say we have something like (test1, test2, test3="3", test4="4") the result will be that test1 == "3", test2 == "4", test3 == nil and test4 == "4" I understand why this happens, but if we do something like (test1, test2, test3="3", test4="4", test5 = "5", test6 = "6") now the result is test1 == "3", test2 == "4", test3 == "5", test4 == "6", test5 == "5", test6 == "6" Why isn't test5 == nil?

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  • List comprehension in Ruby

    - by Readonly
    To do the equivalent of Python list comprehensions, I'm doing the following: some_array.select{|x| x % 2 == 0 }.collect{|x| x * 3} Is there a better way to do this...perhaps with one method call?

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  • In ruby is there detailed documentation / information on how "<<" can and should be used (see exampl

    - by kamal
    use a YML file, which has key , value pairs yml_hosts = YAML::load(File.open('hosts.yml')) ..... for each pair yml_hosts.each_pair {|key_hosts , value_hosts| ...... redirect to a String "value_hosts" value_hosts << "#{$.} #{line}" if line =~ /recoverable NFE/ Is there a better way of doing this, since i am using the condition: if ! value_hosts.empty? to do an action, like sending email, etc but value_hosts is never Empty so i always get an email, even though, i ONLY want top get an email, if line =~ /recoverable NFE/

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  • Are there any Tutorials for Protobuf-net?

    - by AKRamkumar
    I have been reading about protobuf-net and it is amazing! Are there any tutorials that I could use? (More specifically for Dictionary<TKey,TValue> and contracts for generics) Are there any tips associated with it? Could I simply plug it into my current codebase or are there any changes I need to do?

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  • How to get structure of a Google Protobuf message without the definition

    - by dqminh
    I have to get the message structure of a protobuf message transfered to me without the message's definition. Using UnknownFieldSet methods, I was able to get a string representation of the message as below: 1: "a" 2: { 3:"b" 4:"c" } What data structure does field 2 represent ? Using UnknownFieldSet.Field.getGroupList i was able to get the content of field 3 and 4, does that means field 2 has the "deprecated" group structure ?

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  • How do I start IRB console from a rake task?

    - by Michael Lang
    I'm trying to write a rake task that will set up an environment mirroring my project. task :environment do require 'rubygems' require 'sequel' # require 'my_projects_special_files' end task :foo => [:environment] do require 'irb' IRB.start end Leads to irb complaining that "foo" doesn't exist (the name of the task) 10:28:01:irb_test rake foo --trace (in /Users/mwlang/projects/personal/rake/irb_test) ** Invoke foo (first_time) ** Invoke environment (first_time) ** Execute environment ** Execute foo rake aborted! No such file or directory - foo /opt/local/lib/ruby/1.8/irb/input-method.rb:68:in `initialize' /opt/local/lib/ruby/1.8/irb/input-method.rb:68:in `open' /opt/local/lib/ruby/1.8/irb/input-method.rb:68:in `initialize' /opt/local/lib/ruby/1.8/irb/context.rb:80:in `new' /opt/local/lib/ruby/1.8/irb/context.rb:80:in `initialize' /opt/local/lib/ruby/1.8/irb.rb:92:in `new' /opt/local/lib/ruby/1.8/irb.rb:92:in `initialize' /opt/local/lib/ruby/1.8/irb.rb:57:in `new' /opt/local/lib/ruby/1.8/irb.rb:57:in `start' /Users/mwlang/projects/personal/rake/irb_test/Rakefile:9

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  • problem with uninitialized constant

    - by VinTem
    Hi, I have the following controller class ActiveUsersController < ApplicationController def edit end end And my routes.rb is like this: map.resources :active_users When I try to access the controller using the url http://localhost:3000/active_users/COo8e45RqQAHr6CqSCoI/edit I got the following error: NameError in Active usersController#edit uninitialized constant ActiveUsersController RAILS_ROOT: /Users/vintem/Documents/Projetos/Pessoal/bugfreela Application Trace | Framework Trace | Full Trace /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:443:in load_missing_constant' /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:80:inconst_missing' /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:92:in const_missing' /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/inflector.rb:361:inconstantize' /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/inflector.rb:360:in each' /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/inflector.rb:360:inconstantize' /Users/vintem/.gem/ruby/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/string/inflections.rb:162:in constantize' /Users/vintem/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/routing/route_set.rb:443:inrecognize' /Users/vintem/.gem/ruby/1.8/gems/actionpack-2.3.5/lib/action_controller/routing/route_set.rb:436:in `call' Can anyone help me? Thanks

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