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• how can I generate json from respond_to method in rails?

  - by Oberon Dude

  If I have a block of code like this: def show @post = Post.find(params[:id]) respond_to do |format| format.html # show.html.erb format.xml { render :xml => @post } end end How do I add something like format.json Any tips, pointers, ideas gladly welcomed...

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• Authlogic's current_user object in models

  - by jriff

  Hi all! I need to know the ID of the current user in a model: def after_save desc, points=nil, nil if answer_index == daily_question.correct_answer_index desc = I18n.t('daily_question.point_log.description.correct') points=daily_question.points else desc = I18n.t('daily_question.point_log.description.incorrect') end current_user.give_points(:description => desc, :points => points ) end But I guess that is not how it is done? Regards, Jacob

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• django url from another template than the one associated with the view-function

  - by dana

  Heyy there, i have an application, and in my urls.py i have something like that: urlpatterns = patterns('', url(r'^profile_view/(?P<id>\d+)/$', profile_view, name='profile_view'),) meaning that the profile_view function has id as a parameter. Now, i want to call that function from another template than the one associated with the def-view that has this url. How should i do that? i have to put two render_to_response to one same function, in order to render the objects from both models? thank you!

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• Unable to open images with Python's Image.open()

  - by ensnare

  My code reads: import Image def generateThumbnail(self, width, height): """ Generates thumbnails for an image """ im = Image.open(self._file) When I call this function, I get an error: ? AttributeError: type object 'Image' has no attribute 'open' However in the console: import Image im = Image.open('test.jpg') I have no problem. Any ideas? Thanks!

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• Trouble with array of dictionaries, ruby

  - by user299450

  I am getting the following error. game.rb:46:in `play': undefined method `[]' for nil:NilClass (NoMethodError) from game.rb:45:in each' from game.rb:45:inplay' from game.rb:56 with this code, def play() currentTile = nil @tiles.each do |tile| if(tile['Name'] == 'Starting Square') currentTile = tile end puts("#{currentTile['Desciption']}") end end This is part of a text adventure game, I am playing with @tiles is an array of tiles that was read from a file. Each tile is a dictionary. Thanks for any help, I cant figure this out

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• Blackberry (Java) - drawing text in two different fonts

  - by paullb

  using the g.drawText function (two calls one for each text) is it possible to write text in two different sizes? g.drawText("abc",0,0); //whatever code to change font goes here g.drawText("def",30,30);

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• Ruby: Alter class static method in a code block

  - by Phuong Nguy?n

  Given the Thread class with it current method. Now inside a test, I want to do this: def test_alter_current_thread Thread.current = a_stubbed_method # do something that involve the work of Thread.current Thread.current = default_thread_current end Basically, I want to alter the method of a class inside a test method and recover it after that. I know it sound complex for another language, like Java & C# (in Java, only powerful mock framework can do it). But it's ruby and I hope such nasty stuff would be available

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• Rails: url_for to be available in a isolated class that must be instanced

  - by Totty

  Rails: url_for to be available in a isolated class that must be instanced: class ProfilePresenter < ActionController::Base attr_reader :profile def initialize(profile) super @a = url_for(:controller => 'profiles', :action => 'view', :profile_url => 'dd') @a @profile = profile end end How to make the url_for work? i tried to extend the ActionController::Base and the ActionView::Base and i cant :s

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• Ruby proc vs lambda in initialize()

  - by Jimmy Chu

  I found out this morning that proc.new works in a class initialize method, but not lambda. Concretely, I mean: class TestClass attr_reader :proc, :lambda def initialize @proc = Proc.new {puts "Hello from Proc"} @lambda = lambda {puts "Hello from lambda"} end end c = TestClass.new c.proc.call c.lambda.call In the above case, the result will be: Hello from Proc test.rb:14:in `<main>': undefined method `call' for nil:NilClass (NoMethodError) Why is that? Thanks!

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• How can I refer to class variable in a function without referring to its class in Python?

  - by Alex B

  I have a following class: class Foo: CONSTANT = 1 def some_fn(self): a = Foo.CONSTANT # do something How can I refer to Foo.CONSTANT without referring to Foo, or refer to Foo in a generic way? (I don't want to change all references to it when renaming a class)

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• Passing direct parameters to a Controller#method when testing via RSpec

  - by gmile

  Normally to pass parameters via in RSpec we do: params[:my_key] = my_value get :my_method Where my_method deals with what it received from params. But in my controller I have a method, which takes args directly i.e.: def my_method(*args) ... end How do I call the method with those args from within the test? I've tried get :my_method(args) but Ruby interpreter complains about syntax error.

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• add_without_safety create new DB entry in controller

  - by Karl Entwistle

  Im trying to get a controller to create a new account with the user id filled in, this doesn't work in my controller or in the console, why? Any suggestions on how to implement this would be much appreciated. class PaymentNotification < ActiveRecord::Base after_create :add_account_to_market private def add_account_to_market if status == "Completed" line = LineItem.find(:first, :conditions => { :cart_id => cart.id }) line.quantity.times do Account.new(:user_id => cart.user_id) end end end end

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• How to test ActiveRecord callacks with RSpec?

  - by FoxDemon

  How to test the following example? class Post < ActiveRecord::Base belongs_to :discussion def after_save # or after_create discussion.touch end end

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• Filtering python string through external program

  - by Peter

  What's the cleanest way of filtering a Python string through an external program? In particular, how do you write the following function? def filter_through(s, ext_cmd): # Filters string s through ext_cmd, and returns the result. # Example usage: # filter a multiline string through tac to reverse the order. filter_through("one\ntwo\nthree\n", "tac") # => returns "three\ntwo\none\n" Note: the example is only that - I realize there are much better ways of reversing lines in python.

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• A better way to fine a module's children?

  - by c00lryguy

  This is what I've got, but it also finds classes and other constants.. is there a better way? class Module def children constants.collect { |c| const_get(c) }.compact end end

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• Does my function right on python?

  - by Ali Ismayilov

  Write a function which takes a string argument, and creates and returns an Employee object containing details of the employee specified by the string. The string should be assumed to have the format 12345 25000 Consultant Bart Simpson The first three items in the line will be the payroll number, salary and job title and the rest of the line will be the name. There will be no spaces in the job title but there may be one or more spaces in the name. My function: def __str__(self): return format(self.payroll, "d") + format(self.salary, "d") + ' ' \ + self.jobtitle + self.name

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• Is there an equivalent to RSpec's before(:all) in MiniTest?

  - by bergyman

  Since it now seems to have replaced TestUnit in 1.9.1, I can't seem to find an equivalent to this. There ARE times when you really just want a method to run once for the suite of tests. For now I've resorted to some lovely hackery along the lines of: Class ParseStandardWindTest < MiniTest::Unit::TestCase @@reader ||= PolicyDataReader.new(Time.now) @@data ||= @@reader.parse def test_stuff transaction = @@data[:transaction] assert true, transaction end end

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• In Ruby, in the context of a class method, what are instance and class variables?

  - by J. Pablo Fernández

  If I have the following piece of Ruby code: class Blah def self.bleh @blih = "Hello" @@bloh = "World" end end What exactly are @blih and @@bloh? @blih is an instance variable in the class Blah, and @@bloh is a class variable in the class Blah, correct? Does it mean that @@bloh is a variable in Blah's class, Class?

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• Creating classes that can be instantiated with single or multiple elements as constructor's argument

  - by Jeriho

  I want to have class that can be instantiated with list, array, seq, set, stack, queue etc. In my opinion class A class B(elems:A*) should handle such stuff. This is my solution: class A class B(elems:Iterable[A]){ def this(elem:A) = this(Seq(elem)) } Can you suggest any improvements?

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• Can regex match be based on two lines of text?

  - by Matt

  Let's say I have def abc xyz abc And I want to match xyz abc as a whole Is this possible using the most generic RegEx possible? That is not the perl RegEx or .Net Regex which have multi line flags. I guess it would be BNF to match this.

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• Get ahold of session in command object in Grails

  - by UltraVi01

  How can I get the session from within a command object? I have tried: import org.springframework.security.context.SecurityContextHolder as SCH class MyCommand { def session = RCH.currentRequestAttributes().getSession() } This throws java.lang.IllegalStateException: No thread-bound request found: Are you referring to request attributes outside of an actual web request, or processing a request outside of the originally receiving thread? If you are actually operating within a web request and still receive this message, your code is probably running outside of DispatcherServlet/DispatcherPortlet: In this case, use RequestContextListener or RequestContextFilter to expose the current request.

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• loading other scripts from a groovy script?

  - by IttayD

  How can I load other scripts from within a groovy script? In particular, I want this: in file A.groovy: def say(String msg) { println(msg) } say("hi") in file B.groovy: load("A.groovy") say("bye") running 'groovy B.groovy' should print hi bye

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• How to get the full file path of an arbitrary ruby class?

  - by Travis

  eg: class Base def self.inherited(subclass) puts "New subclass: #{subclass}" path_of_subclass = ???? end end Then in another file/class, it extends Base. class X < Base .... end How would I get the path to the rb file of that subclass from the super class.

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• Is there an ActiveRecord equivalent to using a nested subquery i.e. ... where NOT IN(select...) ?

  - by Snorkpete

  I have 3 models: Category, Account, and SubAccount The relations are: Accounts has_many :sub_accounts Categories has_many :sub_accounts I wanted to get a list of all Categories that are not used by a given account. My method in the Category model currently looks like: class Category < ActiveRecord::Base def self.not_used_by(account) Category.find_by_sql("select * from categories where id not in(select category_id from sub_accounts where account_id = #{account.id})") end end My question is, is there a cleaner alternative than using SQL? NB. I am currently using Rails 3(beta)

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• RAKE won'tt create xml file

  - by user296507

  hi, i'm a bit lost here as to why my RAKE task will not create the desired XML file, however it works fine when i have the method 'build_xml' in the .RB file. require 'rubygems' require 'nokogiri' require 'open-uri' namespace :xml do desc "xml build test" task :xml_build => :environment do build_xml end end def build_xml #build xml docoument builder = Nokogiri::XML::Builder.new do |xml| xml.root { xml.location { xml.value "test" } } end File.open("test.xml", 'w') {|f| f.write(builder.to_xml) } end

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