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  • Problem with MongoDB Ruby Driver

    - by Paul
    I'm on Ubuntu, and I've done install gem mongo which reported Successfully installed bson-1.0 Successfully installed mongo-1.0 2 gems installed I've started mongod Now I cd to the mongo gem directory and try > ruby examples/simple.rb and I get the error ./examples/../lib/mongo.rb:31:in `require': no such file to load -- bson (LoadError) from ./examples/../lib/mongo.rb:31 from examples/simple.rb:3:in `require' from examples/simple.rb:3 which I can't make sense of, since the bson gem is installed > gem list *** LOCAL GEMS *** bson (1.0) bson_ext (1.0) mongo (1.0) rack (1.1.0) sinatra (1.0) Any suggestions what's up here?

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  • Recursive list of lists in XSL

    - by Paul Tomblin
    I have a recursive nodes that I'm trying to set up for jquery-checktree. The nodes look like foo/bar/ID /NAME /CHECKED bar/ID /NAME /CHECKED /bar/ID /NAME /bar/ID /NAME /bar/ID /NAME /CHECKED /bar/ID /NAME /CHECKED Where any bar may or may not have one or more bar nodes below it, but any bar will have ID and NAME and might have a CHECKED. and I want to turn that into <ul> <li><input type="checkbox" name="..." value="..." checked="checked"></input> <label for="...">...</label> <ul> <li><input type="checkbox" name="..." value="..." checked="checked"></input> <label for="...">...</label> </li> </ul> <li>....</li> </ul> I can get the first level by doing: <ul class="tree"> <xsl:for-each select="/foo/bar/"> <li><input type="checkbox" name="{ID}" value="{ID}"> <xsl:if test="CHECKED = 'Y'"><xsl:attribute name="checked">checked</xsl:attribute></xsl:if> </input><label for="{ID}"><xsl:value-of select="NAME"/></label> </li> </xsl:for-each> </ul> But I don't know how to recurse down to the embedded "bar" within the "bar", down to however many levels there might be.

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  • HATEOAS - Discovery and URI Templating

    - by Paul Kirby
    I'm designing a HATEOAS API for internal data at my company, but have been having troubles with the discovery of links. Consider the following set of steps for someone to retrieve information about a specific employee in this system: User sends GET to http://coredata/ to get all available resources, returns a number of links including one tagged as rel = "http://coredata/rels/employees" User follows HREF on the rel from the first request, performing a GET at (for example) http://coredata/employees The data returned from this last call is my conundrum and a situation where I've heard mixed suggestions. Here are some of them: That GET will return all employees (with perhaps truncated data), and the client would be responsible for picking the one it wants from that list. That GET would return a number of URI templated links describing how to query / get one employee / get all employees. Something like: "_links": { "http://coredata/rels/employees#RetrieveOne": { "href": "http://coredata/employees/{id}" }, "http://coredata/rels/employees#Query": { "href": "http://coredata/employees{?login,firstName,lastName}" }, "http://coredata/rels/employees#All": { "href": "http://coredata/employees/all" } } I'm a little stuck here with what remains closest to HATEOAS. For option 1, I really do not want to make my clients retrieve all employees every time for the sake of navigation, but I can see how using URI templating in example two introduces some out-of-band knowledge. My other thought was to use the RetrieveOne, Query, and All operations as my cool URLs, but that seems to violate the concept that you should be able to navigate to the resources you want from one base URI. Has anyone else managed to come up with a good way to handle this? Navigation is dead simple once you've retrieved one resource or a set of resources, but it seems very difficult to use for discovery.

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  • Modifying vertex properties in a Boost::Graph

    - by Paul Nathan
    I am trying to figure out how to use boost::graph to store some information. However, there is information I want tied to each vertex. Staring at the documentation for the library reveals either(a)badly written documentation, or (b), I'm obviously not as good at C++ as I thought. Pick two. I am looking for either a tutorial on assigning properties, or a simple example use.

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  • What static analysis tools are available for C#?

    - by Paul Mrozowski
    What tools are there available for static analysis against C# code? I know about FxCop and StyleCop. Are there others? I've run across NStatic before but it's been in development for what seems like forever - it's looking pretty slick from what little I've seen of it, so it would be nice if it would ever see the light of day. Along these same lines (this is primarily my interest for static analysis), tools for testing code for multithreading issues (deadlocks, race conditions, etc.) also seem a bit scarce. Typemock Racer just popped up so I'll be looking at that. Anything beyond this? Real-life opinions about tools you've used are appreciated.

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  • What are the common programming mistakes in Python?

    - by Paul McGuire
    I was about to tag the recent question in which the OP accidentally shadowed the builtin operator module with his own local operator.py with the "common-mistakes" tag, and I saw that there are a number of interesting questions posted asking for common mistakes to avoid in Java, Ruby, Scala, Clojure, .Net, jQuery, Haskell, SQL, ColdFusion, and so on, but I didn't see any for Python. For the benefit of Python beginners, can we enumerate the common mistakes that we have all committed at one time or another, in the hopes of maybe steering a newbie or two clear of them? (In homage to "The Princess Bride", I call these the Classic Blunders.) If possible, a little supporting explanation on what the problem is, and the generally accepted resolution/workaround, so that the beginning Pythoner doesn't read your answer and say "ok, that's a mistake, how do I fix it?"

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  • Demangling typeclass functions in GHC profiler output

    - by Paul Kuliniewicz
    When profiling a Haskell program written in GHC, the names of typeclass functions are mangled in the .prof file to distinguish one instance's implementations of them from another. How can I demangle these names to find out which type's instance it is? For example, suppose I have the following program, where types Fast and Slow both implement Show: import Data.List (foldl') sum' = foldl' (+) 0 data Fast = Fast instance Show Fast where show _ = show $ sum' [1 .. 10] data Slow = Slow instance Show Slow where show _ = show $ sum' [1 .. 100000000] main = putStrLn (show Fast ++ show Slow) I compile with -prof -auto-all -caf-all and run with +RTS -p. In the .prof file that gets generated, I see that the top cost centers are: COST CENTRE MODULE %time %alloc show_an9 Main 71.0 83.3 sum' Main 29.0 16.7 And in the tree, I likewise see (omitting irrelevant lines): individual inherited COST CENTRE MODULE no. entries %time %alloc %time %alloc main Main 232 1 0.0 0.0 100.0 100.0 show_an9 Main 235 1 71.0 83.3 100.0 100.0 sum' Main 236 0 29.0 16.7 29.0 16.7 show_anx Main 233 1 0.0 0.0 0.0 0.0 How do I figure out that show_an9 is Slow's implementation of show and not Fast's?

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  • Ignore case in Python strings

    - by Paul Oyster
    What is the easiest way to compare strings in Python, ignoring case? Of course one can do (str1.lower() <= str2.lower()), etc., but this created two additional temporary strings (with the obvious alloc/g-c overheads). I guess I'm looking for an equivalent to C's stricmp(). [Some more context requested, so I'll demonstrate with a trivial example:] Suppose you want to sort a looong list of strings. You simply do theList.sort(). This is O(n * log(n)) string comparisons and no memory management (since all strings and list elements are some sort of smart pointers). You are happy. Now, you want to do the same, but ignore the case (let's simplify and say all strings are ascii, so locale issues can be ignored). You can do theList.sort(key=lambda s: s.lower()), but then you cause two new allocations per comparison, plus burden the garbage-collector with the duplicated (lowered) strings. Each such memory-management noise is orders-of-magnitude slower than simple string comparison. Now, with an in-place stricmp()-like function, you do: theList.sort(cmp=stricmp) and it is as fast and as memory-friendly as theList.sort(). You are happy again. The problem is any Python-based case-insensitive comparison involves implicit string duplications, so I was expecting to find a C-based comparisons (maybe in module string). Could not find anything like that, hence the question here. (Hope this clarifies the question).

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  • What is the Proper approach for Constructing a PhysicalAddress object from Byte Array

    - by Paul Farry
    I'm trying to understand what the correct approach for a constructor that accepts a Byte Array with regard to how it stores it's data (specifically with PhysicalAddress) I have an array of 6 bytes (theAddress) that is constructed once. I have a source array of 18bytes (theAddresses) that is loaded from a TCP Connection. I then copy the 6bytes from theAddress+offset into theAddress and construct the PhysicalAddress from it. Problem is that the PhysicalAddress just stores the Reference to the array that was passed in. Therefore if you subsequently check the addresses they only ever point to the last address that was copied in. When I took a look inside the PhysicalAddress with reflector it's easy to see what's going on. public PhysicalAddress(byte[] address) { this.changed = true; this.address = address; } Now I know this can be solved by creating theAddress array on each pass, but I wanted to find out what really is the best practice for this. Should the constructor of an object that accepts a byte array create it's own private Variable for holding the data and copy it from the original Should it just hold the reference to what was passed in. Should I just created theAddress on each pass in the loop

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  • greasemonkey: perform GM_xmlhttpRequest() from eval (follow up)

    - by Paul Tarjan
    How can you call GM_xmlhttpRequest inside of an eval where you are evaling some complicated code, some of which calls GM_xmlhttpRequest. This is a follow up to http://stackoverflow.com/questions/1074236 Here is some sample code: // ==UserScript== // @name Test GM AJAX // ==/UserScript== console = unsafeWindow.console; function fetch(msg) { console.log('fetching: '+msg); GM_xmlhttpRequest({ method: 'GET', url: 'http://google.com', onload: function(responseDetails) { console.log(msg); } }); } function complicated(arg1, arg2) { fetch(arg1 + arg2); } console.log('trying'); var code = 'complicated("Ya", "y!")'; function myEval(code) { eval(code); eval('setTimeout(function(){'+code+'},0)'); eval('setTimeout(fetch,0)'); eval('setTimeout(function(){console.log("here");fetch("cool")},0)'); fetch("BOO"); } myEval(code); which outputs: trying fetching: Yay! fetching: BOO fetching: Yay! fetching: 30 here fetching: cool BOO 30 So the only fetch that worked was the setTimeout(fetch,0) but I need to actually execute the code which includes come complicated code. Any ideas?

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  • Multline Text in a WPF Button

    - by Paul
    How do I get multi-line text on a WPF Button using only C#? I have seen examples of using <LineBreak/> in XAML, but my buttons are created completely programmatically in C#. The number and labels on the buttons correspond to values in the domain model, so I don't think I can use XAML to specify this. I have tried the naive approach below, but it does not work. Button b = new Button(); b.Content = "Two\nLines"; or b.Content = "Two\r\nLines"; In either case, all i see is the first line ("Two") of the text.

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  • How to display static (shared) object's properties via a Forms PropertyGrid?

    - by Paul Sasik
    I would like to display static (shared) objects at runtime in a PropertyGrid but if I try to set the selected object property of the grid like this: _propertyGrid.SelectedObject = System.Windows.Forms.Application I get this compilation error: 'Application' is a type and cannot be used as an expression. Is there a way to display a static (shared) object or the object's properties in the PropertyGrid?

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  • GridView Property clarification

    - by paul
    if i set, CommandArgument="<%#((GridViewRow)Container).RowIndex %" to linkbutton(inside gridview's template field) will it return (i) GridViewRow of current Row or (ii)DataKey value of current row?

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  • Can I use a specific model from within a behavior in CakePHP?

    - by Paul Willy
    I'm trying to write a behavior that will give my models access to a simple workflow engine I've devised. The workflow engine itself works as a CakePHP model, with workflow data stored in the database just as any other model data is stored. Basically what I want to do is have the behavior use the workflow model whenever an action is called on the base model. For example, if the edit() action is executed for Posts, then the Post (with the behavior attached) will trigger the workflow behavior with its own model name, action, and id as arguments (e.g. [Post, edit, 1]). Then the behavior will invoke the functionality of the Workflow model, which has a record for what to do when edit is run on Posts (e.g. send e-mail to users who are subscribed to that post) and will carry that out. My question is, what is the proper way to invoke model/controller methods from within the behavior? The model to be used from within the behavior will always be Workflow, but the behavior should be usable from basically any model (aside from Workflow itself). I know I could run SQL queries directly from the behavior, but of course this is not the Cake way :-) Or, am I going about this in the wrong way? I want to store a certain amount of logic in the database so that it is easily configurable by different users, and not have endless configuration checks within the model/controller logic itself so that workflow steps can be easily added/changed/removed in the future.

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  • Translate COM error codes in C#

    - by Paul Keister
    In C, Pascal, and C++ it is possible to use the FormatMessage function to retrieve a "friendly" error message that corresponds to a COM HRESULT error code. This question contains sample code that demonstrates the C++ approach. Of course it would be possible to build a managed C++ assembly to perform this function for C# and VB.NET code, but I'm wondering: is there a way to translate COM error codes using the .NET system libraries?

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  • Can I delay the keyup event for jquery?

    - by Paul
    I'm using the rottentomatoes movie API in conjunction with twitter's typeahead plugin using bootstrap 2.0. I've been able to integerate the API but the issue I'm having is that after every keyup event the API gets called. This is all fine and dandy but I would rather make the call after a small pause allowing the user to type in several characters first. Here is my current code that calls the API after a keyup event: var autocomplete = $('#searchinput').typeahead() .on('keyup', function(ev){ ev.stopPropagation(); ev.preventDefault(); //filter out up/down, tab, enter, and escape keys if( $.inArray(ev.keyCode,[40,38,9,13,27]) === -1 ){ var self = $(this); //set typeahead source to empty self.data('typeahead').source = []; //active used so we aren't triggering duplicate keyup events if( !self.data('active') && self.val().length > 0){ self.data('active', true); //Do data request. Insert your own API logic here. $.getJSON("http://api.rottentomatoes.com/api/public/v1.0/movies.json?callback=?&apikey=MY_API_KEY&page_limit=5",{ q: encodeURI($(this).val()) }, function(data) { //set this to true when your callback executes self.data('active',true); //Filter out your own parameters. Populate them into an array, since this is what typeahead's source requires var arr = [], i=0; var movies = data.movies; $.each(movies, function(index, movie) { arr[i] = movie.title i++; }); //set your results into the typehead's source self.data('typeahead').source = arr; //trigger keyup on the typeahead to make it search self.trigger('keyup'); //All done, set to false to prepare for the next remote query. self.data('active', false); }); } } }); Is it possible to set a small delay and avoid calling the API after every keyup?

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  • MalformedURLException with file URI

    - by Paul Reiners
    While executing the following code: doc = builder.parse(file); where doc is an instance of org.w3c.dom.Document and builder is an instance of javax.xml.parsers.DocumentBuilder, I'm getting the following exception: Exception in thread "main" java.net.MalformedURLException: unknown protocol: c at java.net.URL.<init>(Unknown Source) at java.net.URL.<init>(Unknown Source) at java.net.URL.<init>(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) at javax.xml.parsers.DocumentBuilder.parse(Unknown Source) at com.acme.ItemToThetaValues.createFiles(ItemToThetaValues.java:47) It's choking on this line of the file: <!DOCTYPE questestinterop SYSTEM "C:\Program Files\Acme\parsers\acme_full.dtd"> I am not getting this error on my machine, while a user is getting it on his machine. We are both using version 6 of the Sun JRE. This error also occurs when he's uses double backslashes in the path instead of single backslashes and when he uses forward slashes instead of backslashes. First of all, is the XML correct? Is the path expressed correctly? Second of all, why is this error occurring on one computer but not on another?

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  • Beyond core java

    - by Paul
    Coming to the end of the first year of my CS degree, we've done some Java but just the core stuff; manipulating strings and arrays, inheritance, implementing logic etc. I visit this website daily and I see so much stuff that is beyond me; using frameworks; managing databases etc. It makes me feel like I've just learned the syntax of Java, and there is so much more to do with it. My question is though, how do I get there? I don't think I'm advanced enough to join an open source project, which seems to be suggested often (though I'd love to) and I've looked at other similar questions on here (like this one) but even then I don't think that'd work for me.. firstly, could somebody try give me some commonly used frameworks etc and how and what they are used for? Where would be a good place to start? How did you get started in using the things you do? Or perhaps you think I'm going down the wrong route. Should I learn another language, and just wait until the moment occurs where it's clear what I should be doing? I'm only in the first year of my degree, so far we've lightly covered Haskell and Java, and I've done a little HTML and CSS in my free time. I know that next year we cover python, so perhaps I should just wait till then and see if I prefer that? I feel like I also risk learning something in depth and then never using it... I suppose I'm also asking for personal experiences; was there a point where you felt you'd exceeded the basic grasp of a language (does not necessarily have to be Java related) and reach a more "advanced" level? I guess I'll put subjective tag on this, but really I just want to know how to get beyond the basic understanding of a language.

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  • Patterns for non-layered applications

    - by Paul Stovell
    In Patterns of Enterprise Application Architecture, Martin Fowler writes: This book is thus about how you decompose an enterprise application into layers and how those layers work together. Most nontrivial enterprise applications use a layered architecture of some form, but in some situations other approaches, such as pipes and filters, are valuable. I don't go into those situations, focussing instead on the context of a layered architecture because it's the most widely useful. What patterns exist for building non-layered applications/parts of an application? Take a statistical modelling engine for a financial institution. There might be a layer for data access, but I expect that most of the code would be in a single layer. Would you still expect to see Gang of Four patterns in such a layer? How about a domain model? Would you use OO at all, or would it be purely functional? The quote mentions pipes and filters as alternate models to layers. I can easily imagine a such an engine using pipes as a way to break down the data processing. What other patterns exist? Are there common patterns for areas like task scheduling, results aggregation, or work distribution? What are some alternatives to MapReduce?

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  • PL/PGSQL function, having trouble accessing a returned result set from psycopg2...

    - by Paul
    I have this pl/pgsql function: CREATE OR REPLACE FUNCTION get_result(id integer) RETURNS SETOF my_table AS $ DECLARE result_set my_table%ROWTYPE; BEGIN IF id=0 THEN SELECT INTO result_set my_table_id, my_table_value FROM my_table; ELSE SELECT INTO result_set my_table_id, my_table_value FROM my_table WHERE my_table_id=id; END IF; RETURN; END; $ LANGUAGE plpgsql; I am trying to use this with Python's psycopg2 library. Here is the python code: import psycopg2 as pg conn = pg.connect(host='myhost', database='mydatabase', user='user', password='passwd') cur = conn.cursor() return cur.execute("SELECT * FROM get_result(0);") # returns NoneType However, if i just do the regular query, I get the correct set of rows back: ... return cur.execute("SELECT my_table_id, my_table_value FROM mytable;") # returns iterable result set Theres obviously something wrong with my pl/pgsql function, but I can't seem to get it right. I also tried using RETURN result_set; instead of just RETURN in the 10th line of my plpgsql function, but got an error from postgres.

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  • Using a variable name in XMLHttpRequest

    - by Paul
    Hi All, I am using jQuery and trying to load a variable in place of a named xml file. My Code: $(document).ready(function() { // bind 'myForm' and provide a simple callback function $('#theForm').ajaxForm(function(responseXML2) { var myxml = responseXML2; alert(responseXML2); displayResult(); }); }); function loadXMLDoc(dname) { if (window.XMLHttpRequest) { alert("loading xmlhttprequest"); xhttp=new XMLHttpRequest(); } else { alert("loading activeX"); xhttp=new ActiveXObject("Microsoft.XMLHTTP"); } alert("bottom load"); xhttp.open("GET",dname,false); xhttp.send(); return xhttp.responseXML; } function displayResult() { alert("setting vars"); alert("displayResult called"); //xml=loadXMLDoc(responseXML2); //tried this and the line below, among others xml=responseXML2; alert("xmlDocLoaded"); xsl=loadXMLDoc("xslt-test.xsl"); alert("XSLloaded"); // code for IE if (window.ActiveXObject) { alert("IE"); ex=xml.transformNode(xsl); document.getElementById("ieiresponse").innerHTML=ex; } // code for Mozilla, Firefox, Opera, etc. else if (document.implementation && document.implementation.createDocument) { alert("notIE"); xsltProcessor=new XSLTProcessor(); xsltProcessor.importStylesheet(xsl); resultDocument = xsltProcessor.transformToFragment(xml,document); document.getElementById("ieiresponse").appendChild(resultDocument); } } In the code above I want to have: //xml=loadXMLDoc(responseXML2); //tried this and the line below, among others xml=responseXML2; instead of a named file: xsl=loadXMLDoc("example.xml"); When I run through the code, it works if I name the file, but when I use the variable, (which does show up in alerts, so is being pulled), it stops the code at the above line (placing the variable as the xml file) Any help would be much appreciated! Thank you in advance.

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