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• Rails - Vestal Versions - Access previous version data w/o restoring?

  - by AnApprentice

  Hello, I'd like to use vestal versions to do the following: Determine the Content of the current record being saved Determine the Content of the last record saved In my model I have: class Note < ActiveRecord::Base versioned :if => :really_create_a_version? def really_create_a_version? XXXXXXXXXXXXXX XXXXXXXXXXXXXX end end Where the XXXX are, how can I get the note.content of the item about to be saved (i'm assuming it hasn't been saved yet to the DB? Is that correct? Also, how can I get the note.content of the save before the current save in progress? Thanks

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• Run php in Drupal template uncached

  - by lokust

  Hi. I need to run a php code snippet in a Drupal template and not have it cached. The php snippet sniffs for a cookie and if found returns one of messages according to the cookie value. ie: if(isset($_GET['key'])) { $cookievalue = $_GET['key']; } if(isset($_COOKIE['cookname'])) { $cookievalue = $_COOKIE['cookname']; } switch ($cookievalue) { case hmm01: echo "abc"; break; case hmm02: echo "def"; break; case hmm03: echo "ghi"; break; default: echo "hello"; } Right now, Drupal displays the messages randomly according to when the page was first caches and with which cookie - no good at all! I can't see a great deal of info on how I might go about this - it seems that you have to turn the cache off for the page rather than run php code uncached.

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• Python del() built-in can't be used in assignment?

  - by emcee

  I noticed a problem when I was trying to use del in a lambda to thin out a list of threads to just those running: map(lambda x: del(x) if not x.isAlive() else x, self.threads) Ignore for a second that this doesn't do anything, I'm just fooling around with map, reduce, and lambda. This fails with a syntax error at del(x). With some messing around, I think the problem is del() doesn't return a value. For example, this fails with the same error: b = 5 x = del(b) This doesn't, however: def rmThis(x): del(x) Which means I'm using this workaround: map(lambda x: rmThis(x) if not x.isAlive() else x, self.threads) So is the limitation just because del() doesn't return a value? Why not? I'm using python 2.6.2

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• How to define a multipage environment not interrupted by tables and figures?

  - by Egon Willighagen

  I have defined a new LaTeX environment for excursions in a book chapter I am writing. The environment is multipage and often includes inline images. Moreover, I am using the shaded environment to give the environment a background colour to make it stand out a bit. However, the environment, as shown below, is split up by floating tables and images, which makes the flow of the environment visually more difficult to follow. For example, it is now difficult to see if that floating image or table is part (the missing background colour does not help). So, I like to extend my environment to disallow it to be interrupted by floating elements, but do not know how to get that done. \newcounter{bioclipse} \def\thebioclipse{\thechapter-\arabic{bioclipse}} \newenvironment{bioclipse}[2][]{\begin{small}\begin{shaded}\refstepcounter{bioclipse} \par\medskip\noindent% \textbf{Bioclipse Excursion~\thebioclipse #1: #2 \vspace{0.1cm} \hrule \vspace{0.1cm}} \rmfamily}{\medskip \end{shaded}\end{small}} Any solution to disallow interruption is fine, even if the background colour is done differently.

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• groovy closure parameters

  - by Don

  Hi, The following example of using the sendMail method provided by the grails mail plugin appears in this book. sendMail { to "[email protected]" subject "Registration Complete" body view:"/foo/bar", model:[user:new User()] } I understand that the code within {} is a closure that is passed to sendMail as a parameter. I also understand that to, subject and body are method calls. I'm trying to figure out what the code that implements the sendMail method would look like, and my best guess is something like this: MailService { String subject String recipient String view def model sendMail(closure) { closure.call() // Code to send the mail now that all the // various properties have been set } to(recipient) { this.recipient = recipient } subject(subject) { this.subject = subject; } body(view, model) { this.view = view this.model = model } } Is this reasonable, or am I missing something? In particular, are the methods invokedwithin the closure (to, subject, body), necessarily members of the same class as sendMail? Thanks, Don

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• Creating a context in custom shoulda macro does not work.

  - by Honza

  I have a custom should macro in my test_helper.rb which looks like this. def self.should_require_login(actions = [:index]) if (actions.is_a? Symbol) actions = [actions] end context "without user" do actions.each do |action| should "redirect #{action.to_s} away" do get action assert_redirected_to login_path end end end if block_given? context "active user logged in" do setup do @user = Factory.create(:user) @user.register! @user.activate! login_as(@user) end yield end end end I would like to use it like this: should_require_login(:protected_action) do should "do something" do ... end end And I am expecting the "do something" test to run in the "active user logged in" context, but the test executes in the top context, like the "active user logged in" context never existed and I fail to see the reason why.

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• Variadic functions and arguments assignment in C/C++

  - by Rizo

  I was wondering if in C/C++ language it is possible to pass arguments to function in key-value form. For example in python you can do: def some_function(arg0 = "default_value", arg1): # (...) value1 = "passed_value" some_function(arg1 = value1) So the alternative code in C could look like this: void some_function(char *arg0 = "default_value", char *arg1) { ; } int main() { char *value1 = "passed_value"; some_function(arg1 = value1); return(0); } So the arguments to use in some_function would be: arg0 = "default_value" arg1 = "passed_value" Any ideas?

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• Python: using a regular expression to match one line of HTML

  - by skylarking

  This simple Python method I put together just checks to see if Tomcat is running on one of our servers. import urllib2 import re import sys def tomcat_check(): tomcat_status = urllib2.urlopen('http://10.1.1.20:7880') results = tomcat_status.read() pattern = re.compile('<body>Tomcat is running...</body>',re.M|re.DOTALL) q = pattern.search(results) if q == []: notify_us() else: print ("Tomcat appears to be running") sys.exit() If this line is not found : <body>Tomcat is running...</body> It calls : notify_us() Which uses SMTP to send an email message to myself and another admin that Tomcat is no longer runnning on the server... I have not used the re module in Python before...so I am assuming there is a better way to do this... I am also open to a more graceful solution with Beautiful Soup ... but haven't used that either.. Just trying to keep this as simple as possible...

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• Ruby Built In Method to Create Multidimensional Array From Single Dimensioned Array

  - by Ell

  If I have an array like this: [0, 1, 2, 3, 4, 5], is there a built in method to create this: [[0, 1, 2], [3, 4, 5]] given a width of 3? If there is no built in method, how could I improve on this? def multi_to_single(array, width) return [].tap{|md_array| (array.length.to_f / width).ceil.times {|y| row = (array[(y*width), width]) md_array.push( row + Array.new(width - row.length)) } } end I feel like I have missed something obvious because I haven't programmed ruby in a while! Thanks in advance, ell. EDIT: It needs to be in the core library, so no ruby on rails or anything.

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• Converting IPv4 or IPv6 address to a long for comparisons

  - by Justin Akehurst

  In order to check if an IPv4 or IPv6 address is within a certain range, I've got code that takes an IPv4 address, turns that into a long, then does that same conversion on the upper/lower bound of the subnet, then checks to see if the long is between those values. I'd like to be able to do the same thing for IPv6, but saw nothing in the Python 2.6 standard libraries to allow me to do this, so I wrote this up: import socket, struct from array import array def ip_address_to_long(address): ip_as_long = None try: ip_as_long = socket.ntohl(struct.unpack('L', socket.inet_pton(socket.AF_INET, address))[0]) except socket.error: # try IPv6 try: addr = array('L', struct.unpack('!4L', socket.inet_pton(socket.AF_INET6, address))) addr.reverse() ip_as_long = sum(addr[i] << (i * 32) for i in range(len(addr))) except socket.error as se: raise ValueError('Invalid address') except Exception as e: print str(e) return ip_as_long My question is: Is there a simpler way to do this that I am missing? Is there a standard library call that can do this for me?

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• Win32 api call via C# fails!

  - by user434186

  Hi. I have a C++ function exported as api like this: #define WIN322_API __declspec(dllexport) WIN322_API char* Test(LPSTR str); WIN322_API char* Test(LPSTR str) { return "hello"; } the function is exported as API correctly by the .DEF file, cause i can see it in Dependency Walker tool. Now i have a C# tester program: [DllImport("c:\\win322.dll")] public static extern string Test([MarshalAs(UnmanagedType.LPStr)] String str); private void Form1_Load(object sender, EventArgs e) { string _str = "0221"; Test(_str); // runtime error here! } on calling the Test() method i get the error: "A call to PInvoke function 'MyClient!MyClient.Form1::Test' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature." i tried many other data types and marshalings, but got nothing! plz help me!

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• more ruby way of doing project euler #2

  - by aharon

  I'm trying to learn Ruby, and am going through some of the Project Euler problems. I solved two as such: def fib(n) return n if n < 2 vals = [0, 1] n.times do vals.push(vals[-1]+vals[-2]) end return vals.last end i = 1 s = 0 while((v = fib(i)) < 4_000_000) s+=v if v%2==0 i+=1 end puts s While that works, it seems not very ruby-ish—I couldn't come up with any good purely Ruby answer like I could with the first one ( puts ( (0..999).inject{ |sum, n| n%3==0||n%5==0 ? sum : sum+n } )).

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• Problem with displaying content when using RJS

  - by Shreyas Satish

  I'm quite sure this is a silly error but I'm unable to spot it. Please help me out on this. This is my controller code def filter_by_content @articles = Article.find(:all) end My RJS (filter_by_content.rjs) update_page do |page| page.replace_html 'articles', :partial => 'main/filtered', :object => @articles end My Partial 'filtered' <div id = "articles"> <% if @articles %> <% @articles.each do |article| %> <%= article.title %> <% end %> <% end %> </div> I checked my server, and the articles are sure getting fetched but the problem is with displaying them. Thanks !

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• Ruby get inheriting class

  - by Brian D.

  I'm working on creating my first plugin for rails. I'm still pretty new to ruby and I was wondering if its possible to get the inheriting class? For example, I'm trying to create a plugin that will allow unit testing and functional testing when you are not using migrations. What I'm trying to do is initialize a class variable named controller to be initialized to the type of controller that is being tested. If I have a base class ControllerTest: class ControllerTest < Test::Unit::TestCase attr_accessor :controller def initialize super @controller = "call function that will find the inheriting classes name and create an instance of that controller type." end end So what I'm currently stuck on is getting the name of the inheriting class. Is this possible? And if not, does anyone know another way on how I could go about implementing this? Thanks in advance.

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• Django: Overriding ModelAdmin save_model not working

  - by tufelkinder

  Even after obj.save(), the obj still does not have an id, so I cannot access or manipulate the m2m records. Just keep getting a "instance needs to have a primary key value before a many-to-many relationship can be used" error. def save_model(self, request, obj, form, change): obj.save() # this doesn't work super(Table2Admin, self).save_model(request, obj, form, change) # still doesn't save for tb1 in obj.table1.all: tb1_obj = ThroughTable.objects.get(table1=bk, table2=obj) # do other stuff What am I doing wrong? Why do I need to do to save this model?

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• django m2m how can i get m2m table elements in a view

  - by dana

  i have a model using m2m feature: class Classroom(models.Model): user = models.ForeignKey(User, related_name = 'classroom_creator') classname = models.CharField(max_length=140, unique = True) date = models.DateTimeField(auto_now=True) open_class = models.BooleanField(default=True) members = models.ManyToManyField(User,related_name="list of invited members", through = 'Membership') and i want to take all members of one class in a view and display them using the template system. In the view, i'm trying to take all the members from a classroom like that: def inside_classroom(request,classname): try: theclass = Classroom.objects.get(classname = classname) members = Members.objects.all() etc but it doesn't work,(though the db_table is named Classroom_Members) i guess i have to use another query for getting all the members from the classroom classname. also, i want to verify if the request.user is a member using (if request.user in members) how can i het those members? Thanks in advance!

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• Clojure: Avoiding stack overflow in Sieve of Erathosthene?

  - by nixx

  Here's my implementation of Sieve of Erathosthene in Clojure (based on SICP lesson on streams): (defn nats-from [n] (iterate inc n)) (defn divide? [p q] (zero? (rem q p))) (defn sieve [stream] (lazy-seq (cons (first stream) (sieve (remove #(divide? (first stream) %) (rest stream)))))) (def primes (sieve (nats-from 2))) Now, it's all OK when i take first 100 primes: (take 100 primes) But, if i try to take first 1000 primes, program breaks because of stack overflow. I'm wondering if is it possible to change somehow function sieve to become tail-recursive and, still, to preserve "streamnes" of algorithm? Any help???

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• Rails: redirect_to :controller=>'tips', :action => 'show', :id => @tip.permalink

  - by john

  hi, I tried to redirect rails to show action by passing controller, action, and params. However, rails ignores the name of action totally! what I got is http://mysite/controllername/paramId so i have error message.... here is the action code I used: def update @tip = current_user.tips.find(params[:id]) @tip.attributes = params[:tip] @tip.category_ids = params[:categories] @tip.tag_with(params[:tags]) if params[:tags] if @tip.save flash[:notice] = 'Tip was successfully updated.' redirect_to :controller=>'tips', :action => 'show', :id => @tip.permalink else render :action => 'edit' end end

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• Parallel Assignment operator in Ruby

  - by Bragaadeesh

  Hi, I was going through an example from Programming in Ruby book. This is that example def fib_up_to(max) i1, i2 = 1, 1 # parallel assignment (i1 = 1 and i2 = 1) while i1 <= max yield i1 i1, i2 = i2, i1+i2 end end fib_up_to(100) {|f| print f, " " } The above program simply prints the fibonacci numbers upto 100. Thats fine. My question here is when i replace the parallel assignment with something like this, i1 = i2 i2 = i1+i2 I am not getting the desired output. My question here is, is it advisable to use parallel assignments? (I come from Java background and it feels really wierd to see this type of assignment) One more doubt is : Is parallel assignment an operator?? Thanks

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• How can I set Invitee in Google Calendar through Python?

  - by Dhaval dave

  I am Setting Google Calendar via python command like this def _InsertQuickAddEvent(self, content="Tennis with dddddd on 5/19/2010 4am-5:30am"): """Creates an event with the quick_add property set to true so the content is processed as quick add content instead of as an event description.""" event = gdata.calendar.CalendarEventEntry() who = whois("[email protected]") event.content = atom.Content(text=content) event.quick_add = gdata.calendar.QuickAdd(value='true'); new_event = self.cal_client.InsertEvent(event, '/calendar/feeds/default/private/full') return new_event this code is given by Google API Can any one suggest what to do to add invitee in this? Important links for that http://code.google.com/apis/calendar/data/1.0/developers_guide_python.html

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• acts_as_taggable_on and auto_complete returning no results

  - by Sean Johnson

  I'm using acts_as_taggable_on in a model, and am trying to implement the auto_complete plugin. It seems as though I have everything hooked up correctly, but the search isn't returning any results. Here's what I have so far: In the view: <%= text_field_with_auto_complete(:link, :tag_list, {}, {:tokens => ','}) %> In the controller: def auto_complete_for_link_tag_list @tags = Link.tag_counts_on(:tags).where('tags.name LIKE ?', params[:link][:tag_list]) render :inline => "<%= auto_complete_result(@tags, 'name') %>", :layout => false logger.info "#{@tags.size} tags found." end The logger keeps returning 0 tags, and nothing shows up in the view (yeah, the layout includes the javascript defaults). Any thoughts or advice would be awesome.

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• Groovy: stub typed reference

  - by Don

  Hi, I have a Groovy class similar to class MyClass { Foo foo } Under certain circumstances I don't want to initialize foo and want to stub out all the calls to it. Any methods that return a value should do nothing. I could do it like this: Foo.metaClass.method1 = {param -> } Foo.metaClass.method2 = { -> } Foo.metaClass.method3 = {param1, param2 -> } While this will work, it has a couple of problems Tedious and long-winded, particularly if Foo has a lot of methods This will stub out calls to any instance of Foo (not just foo) Although Groovy provides a StubFor class, if I do this: this.foo = new groovy.mock.interceptor.StubFor(Foo) I get a ClassCastException at runtime. Although this would work if I could redefine foo as: def foo But for reasons I won't go into here, I can't do that. Thanks, Don

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• Python: Converting a tuple to a string with 'err'

  - by skylarking

  Given this : import os import subprocess def check_server(): cl = subprocess.Popen(["nmap","10.7.1.71"], stdout=subprocess.PIPE) result = cl.communicate() print result check_server() check_server() returns this tuple: ('\nStarting Nmap 4.53 ( http://insecure.org ) at 2010-04-07 07:26 EDT\nInteresting ports on 10.7.1.71:\nNot shown: 1711 closed ports\nPORT STATE SERVICE\n21/tcp open ftp\n22/tcp open ssh\n80/tcp open http\n\nNmap done: 1 IP address (1 host up) scanned in 0.293 seconds\n', None) Changing the second line in the method to result, err = cl.communicate() results in check_server() returning : Starting Nmap 4.53 ( http://insecure.org ) at 2010-04-07 07:27 EDT Interesting ports on 10.7.1.71: Not shown: 1711 closed ports PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 80/tcp open http Nmap done: 1 IP address (1 host up) scanned in 0.319 seconds Looks to be the case that the tuple is converted to a string, and the \n's are being stripped.... but how? What is 'err' and what exactly is it doing?

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• Rails Mikel Mail Gem How to use Views

  - by Victor Martins

  I'm trying to use mikel gem mail on my 2.3.5 Rails App http://github.com/mikel/mail I have it working like this. I've made a MailComHelper, made a method like this : def self.welcome(user,password) @user = user m = Mail.new m.from = '[email protected]' m.to = @user.email m.subject = 'welcome' m.body = 'The body' m.delivery_method :sendmail m.deliver! end And it works, I receive the mail. But I wish I could use the old way of calling a view ( html.erb ) file and send that code has the body. I've read the documentation but haven't found a way to do it. Has anyone found a way to do it?

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• Error while trying to parse a website url using python . how to debug it ?

  - by mekasperasky

  #!/usr/bin/python import json import urllib from BeautifulSoup import BeautifulSoup from BeautifulSoup import BeautifulStoneSoup import BeautifulSoup def showsome(searchfor): query = urllib.urlencode({'q': searchfor}) url = 'http://ajax.googleapis.com/ajax/services/search/web?v=1.0&%s' % query search_response = urllib.urlopen(url) search_results = search_response.read() results = json.loads(search_results) data = results['responseData'] print 'Total results: %s' % data['cursor']['estimatedResultCount'] hits = data['results'] print 'Top %d hits:' % len(hits) for h in hits: print ' ', h['url'] resp = urllib.urlopen(h['url']) res = resp.read() soup = BeautifulSoup(res) print soup.prettify() print 'For more results, see %s' % data['cursor']['moreResultsUrl'] showsome('sachin') What is the wrong in this code ? Note all the 4 links that I am getting out of the search , I am feeding it back to extract the contents out of it , and then use BeautifulSoup to parse it . How should I go about it ?

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