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  • Rails ActiveRecord BigNum to JSON

    - by Jon Hoffman
    Hi, I am serializing an ActiveRecord model in rails 2.3.2 to_json and have noticed that BigNum values are serialized to JSON without quotes, however, javascript uses 64 bits to represent large numbers and only ~52(?) of those bits are available for the integer part, the rest are for the exponent. So my 17 digit numbers become rounded off, grrr. Try the following in the Firebug console: console.log(123456789012345678) So, I'm thinking that the json encoder should be smart enough to quote numbers that are too big for the javascript engines to handle. How do I fix up rails to do that? Or, is there a way to override the encoding for a single property on the model (I don't want to_s elsewhere)? Thanks.

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  • iFrame in Firefox hidden window with a contentWindow.history?

    - by Jon
    I'm trying to run a hosted script with content privileges in my Firefox extension. To do this, I create a content iframe in the hidden window pointed at a html file that pulls the script. This script requires the 'history' be available, but the iframes created in the hidden window have no history for some reason. Chromebug reports this for the iframe's contentWindow.history: object does not support history (nsIDOMHistory) And the script gives this error when its not available: Error: Component returned failure code: 0x80004005 (NS_ERROR_FAILURE) [nsIDOMHistory.length] Any ideas?

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  • Filter entities that match all pairs

    - by Jon
    I have an entity (let's say Person) with a set of arbitrary attributes with a known subset of values. I need to search for all of these entities that match all my filter conditions. For example, my table structures look like this: Person: id | name 1 | John Doe 2 | Jane Roe 3 | John Smith Attribute: id | attr_name 1 | Sex 2 | Eye Color ValidValue: id | attr_id | value_name 1 | 1 | Male 2 | 1 | Female 3 | 2 | Blue 4 | 2 | Green 5 | 2 | Brown PersonAttributes id | person_id | attr_id | value_id 1 | 1 | 1 | 1 2 | 1 | 2 | 3 3 | 2 | 1 | 2 4 | 2 | 2 | 4 5 | 3 | 1 | 1 6 | 3 | 2 | 4 In JPA, I have entities built for all of these tables. What I'd like to do is perform a search for all entities matching a given set of attribute-value pairs. For instance, I'd like to be able to find all males (John Doe and John Smith), all people with green eyes (Jane Roe or John Smith), or all females with green eyes (Jane Roe). I see that I can already take advantage of the fact that I only really need to match on value_id, since that's already unique and tied to the attr_id. But where can I go from there?

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  • What is the career value in learning ColdFusion?

    - by Jon Cram
    ColdFusion is a language I encounter rather infrequently, however it does turn up from time to time either in job adverts or as .cfm file extensions in URLs. There are possible job opportunities near to where I plan to live for ColdFusion developers. It might be in my interests to have a look at ColdFusion. ColdFusion appears, to me, to be a minority language compared to C#, Java or indeed most popular languages. Don thinks ColdFusion is declining in popularity. Would a ColdFusion position today be more related to the maintenance of legacy code than innovative, creative development, thus less interesting? Is there any long term career value in learning ColdFusion?

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  • Useful Eclipse Java Code Templates

    - by Jon
    You can create various Java code templates in Eclipse via the Window->Preferences->Java -> Editor -> Templates e.g. sysout is expanded to: System.out.println(${word_selection}${});${cursor} You can activate this by typing sysout followed by CTRL+SPACE What useful Java code templates do you currently use? Include the name and description of it and why it's awesome. There's an open bounty on this for an original/novel use of a template rather than a built-in existing feature. Create Log4J logger Get swt color from display Syncexec - Eclipse Framework Singleton Pattern/Enum Singleton Generation Readfile Const Traceout Format String Comment Code Review String format Try Finally Lock Message Format i18n and log Equalsbuilder Hashcodebuilder Spring Object Injection Create FileOutputStream

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  • Reading Source Code Aloud

    - by Jon Purdy
    After seeing this question, I got to thinking about the various challenges that blind programmers face, and how some of them are applicable even to sighted programmers. Particularly, the problem of reading source code aloud gives me pause. I have been programming for most of my life, and I frequently tutor fellow students in programming, most often in C++ or Java. It is uniquely aggravating to try to verbally convey the essential syntax of a C++ expression. The speaker must give either an idiomatic translation into English, or a full specification of the code in verbal longhand, using explicit yet slow terms such as "opening parenthesis", "bitwise and", et cetera. Neither of these solutions is optimal. On the one hand, an idiomatic translation is only useful to a programmer who can de-translate back into the relevant programming code—which is not usually the case when tutoring a student. In turn, education (or simply getting someone up to speed on a project) is the most common situation in which source is read aloud, and there is a very small margin for error. On the other hand, a literal specification is aggravatingly slow. It takes far far longer to say "pound, include, left angle bracket, iostream, right angle bracket, newline" than it does to simply type #include <iostream>. Indeed, most experienced C++ programmers would read this merely as "include iostream", but again, inexperienced programmers abound and literal specifications are sometimes necessary. So I've had an idea for a potential solution to this problem. In C++, there is a finite set of keywords—63—and operators—54, discounting named operators and treating compound assignment operators and prefix versus postfix auto-increment and decrement as distinct. There are just a few types of literal, a similar number of grouping symbols, and the semicolon. Unless I'm utterly mistaken, that's about it. So would it not then be feasible to simply ascribe a concise, unique pronunciation to each of these distinct concepts (including one for whitespace, where it is required) and go from there? Programming languages are far more regular than natural languages, so the pronunciation could be standardised. Speakers of any language would be able to verbally convey C++ code, and due to the regularity and fixity of the language, speech-to-text software could be optimised to accept C++ speech with a high degree of accuracy. So my question is twofold: first, is my solution feasible; and second, does anyone else have other potential solutions? I intend to take suggestions from here and use them to produce a formal paper with an example implementation of my solution.

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  • Returning Index in Enumerable Select

    - by Jon
    I have a List<MyClass> with 2 items which have a SequenceNumber property. If I use this code below the returned index is 0 not 1: var test = TrackingCollection .Where(x => x.SequenceNumber == 2) .Select((item, index) => new { index, item.SequenceNumber }); Is this because that refers to 0 as the index in my new anonymous type or is it some zero index based weirdness that I just need to increment. What I'm after is to return the index in TrackingCollection where the sequence number is 2 or 887 or any other correct index in the original collection...

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  • Problem with multiple forms on one page

    - by Jon
    I have two forms on a web page. The first is not an actual form since this is a .NET based site. So instead I have the standard input fields, along with asp:Button PostBackURL="http:/www...". One of the fields is "email". That works fine. Then I have an XSLT file with another form, and am using Javascript (via this.form.action, .method, etc) to post that form. Besides that it has the same fields as the form above. The problem is that when someone submits the second form, the script at the PostBackURL returns an error because the "email" field appears empty. So it seems as though the form is submitting the "email" field form the top form instead of the current one. I thought maybe the wrong form is being submitted, but if I remove the "email" field from the top form, and then submit the bottom one, it works fine. Any ideas on how to fix this? Thanks.

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  • Retrieve Table Row Index of Current Row

    - by Jon
    Hi Everyone, I am trying to validate a text input when it loses focus. I would like to know which row of the table it is in. This is what I have so far and it keeps coming back as undefined. Any ideas? $("div#step-2 fieldset table tbody tr td input").blur(function() { var tableRow = $(this).parent().parent(); if ($.trim($(this).val()) == "") { $(this).addClass("invalid"); alert(tableRow.rowIndex); $(this).val(""); } else { $(this).removeClass("invalid"); checkTextChanges(); } });

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  • firefox lead dot in cookie issue

    - by Jon
    Hi all, We are having an annoying issue with Firefox and cookies. We have the following domains: sub1.mydomain.com sub2.mydomain.com sub3.mydomain.com otherdomain.com We have converting our framework to be multilingual and providing a drop down to change the language at any point during site. The code base is shared across all the domains above. We can not set a cookie across all "mydomain.com" sites, they have to be on each of the sub domains. To get this to work we set a JavaScript cookie when the users chooses a new language. When the page posts back to the server the code picks this up and sets the users preferences to that new language code, (this is all C# and ASP.NET). We have to set the host to be "subX.mydomain.com" and the path to be "/" in the cookie so that it is just for the subdomain and all parts of that domain. This works great on all browsers apart from FireFox. It seems that firefox will pre append a DOT to the beginning of domain so ".subX.mydomain.com". When the code posts back with FireFox the cookie is always null. Has anyone had this situation, (I imagine it is not al that uncommon). I have read a lot of people saying, remove the domain from the cookie, but that can not work for us as we have multiple subdomains that need their own cookie values. Thanks

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  • Python libusb pyusb "mach-o, but wrong architecture"

    - by Jon
    I am having some trouble with the pyusb module. I have narrowed down the problem to a single line, and have created a small example script to replicate the error. #!/usr/bin/env python """ This module was created to isolate the problem in the pyusb package. Operating system: Mac OS 10.6.3 Python Version: 2.6.4 libusb 1.0.8 has been successfully installed using: sudo port install libusb I have also tried modifying /opt/local/etc/macports/macports.conf to force the i386 architecture instead of x86_64. """ from ctypes import * import ctypes.util libname = ctypes.util.find_library('usb-1.0') print 'libname: ', libname l = CDLL(libname, RTLD_GLOBAL) # RESULT: #libname: /usr/local/lib/libusb-1.0.dylib #Traceback (most recent call last): # File "./pyusb_problem.py", line 7, in <module> # l = CDLL(libname, RTLD_GLOBAL) # File "/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/ctypes/__init__.py", line 353, in __init__ # self._handle = _dlopen(self._name, mode) #OSError: dlopen(/usr/local/lib/libusb-1.0.dylib, 10): no suitable image found. Did find: # /usr/local/lib/libusb-1.0.dylib: mach-o, but wrong architecture # End of File This same script runs on Ubuntu 10.04 successfully. I have tried building the libusb module (directly from source AND through macports) for 32-bit (i386) instead of x86_64 (default for OS 10.6), but I receive the same error. Thank-you in advance for your help!

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  • GIT clone repo across local file system

    - by Jon
    Hi all, I am a complete Noob when it comes to GIT. I have been just taking my first steps over the last few days. I setup a repo on my laptop, pulled down the Trunk from an SVN project (had some issues with branches, not got them working), but all seems ok there. I now want to be able to pull or push from the laptop to my main desktop. The reason being the laptop is handy on the train as I spend 2 hours a day travelling and can get some good work done. But my main machine at home is great for development. So I want to be able to push / pull from the laptop to the main computer when I get home. I thought the most simple way of doing this would be to just have the code folder shared out across the LAN and do: git clone file://192.168.10.51/code unfortunately this doesn't seem to be working for me: so I open a git bash cmd and type the above command, I am in C:\code (the shared folder for both machines) this is what I get back: Initialized empty Git repository in C:/code/code/.git/ fatal: 'C:/Program Files (x86)/Git/code' does not appear to be a git repository fatal: The remote end hung up unexpectedly How can I share the repository between the two machines in the most simple of ways. There will be other locations that will be official storage points and places where the other devs and CI server etc will pull from, this is just so that I can work on the same repo across two machines. Thanks

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  • Language in a Sandbox in Rails

    - by Jon Romero
    I've found that there WAS a sandbox gem (created by the guys that made try ruby in your browser but it was compatible only with Ruby 1.8. Another problem is that I cannot find it anymore (it seems they stop serving the gem from the servers...). So, is there any secure way of running ruby in a sandbox (so you can run it from your browser)? Or an easy way to run (for example lua/python) in a sandbox (no filesystem access, no creation of objects etc) and be called from Ruby (Rails 2.2)? I want to make an application like try_ruby even without having a ruby underneath. But it has to be an easy language (I saw there was a prolog in ruby, even a lisp but I don't think they are easy to learn languages...). So, do you have any suggestions or tips? Or should I just start creating my own DSL in Ruby (if there is a solution in creating a somewhat safe system)? Thx

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  • Reuse, Rewrite, or Refactor?

    - by Jon Purdy
    At work I inherited development of a PHP-based Web site after the consultant who originally produced it bailed out and left without a trace. Literally half of the code is ripped from online tutorials, and there are thousands of lines of cruft that, being incomplete, do precious little. Hardly any of it actually works. I've been trying to pull out the usable components, such as the layout (cleverly intermixed with code), session management (delicately seasoned with unescaped, unvalidated SQL queries), and a few other things, but it's very difficult to force all of this junk into place. Further, I don't speak idiomatic PHP, being more of a Perl user, and I'm supposed to be on this project principally for maintenance, so rewriting everything seems like it would take just as long as wrestling the existing monster back into place. As an aside, I have literally never seen anything as badly written as this. Welcome me to the world of working with other people's code, I guess, but I do hope it's not this common in the real world to have such gems as these: // WHY IS THIS NOT WORKING // I know this is bad but were going for working stuff right now... // This is a PHP code outputing Javascript code outputting HTML...do not go further // Not userful I'm looking for the best advice I can get here. What would you do if you were in my position?

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  • Is it possible to populate HTML form field data in an iPhone UIWebView using external accessory fram

    - by Jon Smallberries
    I have an iPhone app where I'd like to load a remotely served HTML form into a UIWebView and then populate that form as data becomes available from an external accessory using the "External Accessory Framework." Right now the data is entered by hand. The proposed flow is: Fetch an HTML page containing a form and put it into a UIWebView When data becomes available from the external accessory, populate the form field(s) Submit the form Is it possible to do this by "injecting" data from the external accessory into the UIWebView when all required data has been retrieved from the external accessory? I cannot seem to find any good examples on how to use the external accessory framework to achieve this.

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  • What is instrumentation?

    - by Jon Seigel
    I've heard this term used a lot in the same context as logging, but I can't seem to find a clear definition of what it actually is. Is it simply a more general class of logging/monitoring tools and activities? Please provide sample code/scenarios when/how instrumentation should be used.

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  • High-Performance In-Browser Networking

    - by Jon Purdy
    (Similar in spirit to but different in practice from this question.) Is there any cross-browser-compatible, in-browser technology that allows a high-performance perstistent network connection between a server application and a client written in, say, Javascript? Think XmlHttpRequest on caffeine. I am working on a visualisation system that's restricted to at most a few users at once, and the server is pretty robust, so it can handle as much as it needs to. I would like to allow the client to have access to video streamed from the server at a minimum of about 20 frames per second, regardless of what their graphics hardware capabilities are. Simply put: is this doable without resorting to Flash or Java?

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  • Useful Java Annotations

    - by Jon
    I'm interested in finding out exactly which Java annotations people think are most useful during development. This doesn't necessarily have to limited to the core Java API, you may include annotations you found in third party libraries or annotations you've developed yourself (make sure you include a link to the source). I'm really interested in common development tasks rather than knowing why the @ManyToOne(optional=false) in JPA is awesome... Include the annotation and a description of why it's useful for general development.

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  • Pair programming: How should the pairs be chosen?

    - by Jon Seigel
    This topic has been covered peripherally in bits and pieces in some of the other pair-programming questions, but I want to (a) consolidate this knowledge into a separate question, and, most importantly, (b) go into much more depth on the subject. From the perspective of being an effective manager, how should pairs be arranged for pair programming to maximize both the happiness and productivity of the overall team? Some ideas to get started: Should two people never be paired (because of personalities, for example)? How much overlap in skillsets is needed? How much disconnect in skillsets is too much to overcome? (No two people will overlap 100%, and a disconnect in skills can be very beneficial to both people.) Should everyone pair with everyone else on a fixed/rotating basis? Should certain pairs be arranged to accomplish specific tasks? How important a role does HR play when growing or reorganizing the team?

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  • Cross domain cookie tracking

    - by Jon
    Hi, The company I work for has four domains and I'm trying to set up the cookies, so one cookie can be generated and tracked across all the domains. From reading various posts on here I thought it was possible. I've set up a sub domain on one site, to serve a cookie and 1*1 pixel image to all four sites. But I can't get this working on the other sites. If anyone can clarify that: Its possible? If I'm missing something obvious or a link to a good example? I'm trying to do this server side with PHP. Thanks

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  • Snow Leopard - PHP 5.3.1 installed... but no PEAR?

    - by Jon Busby
    I've been trying to do some PHP work on my snow leopard machine.. but I've found issues when I need to use PEAR packages (as symfony handles its php plugins with PEAR). I've found some references that state that snow leopard includes PEAR.. but how come I cant find it?! Could someone confirm this.. if if so, where is my pear?

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  • IntelliJ IDEA "Tomcat manager" application

    - by Jon
    Hello, I'm using IntelliJ IDEA 9.0.2 but I assume this question applies to previous versions as well. In the Run/Debug Configurations dialog there is an option called "Deploy 'Tomcat Manager' application", but I haven't been able to find any documentation for how to use it in the IntelliJ help or online. Has anyone had experience using this, and know what URL I could use to access it once Tomcat is running? Thanks!

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  • Match entities fulfilling filter (strict superset of search)

    - by Jon
    I have an entity (let's say Person) with a set of arbitrary attributes with a known subset of values. I need to search for all of these entities that match all my filter conditions. That is, given a set of Attributes A, I need to find all people that have a set of Attributes that are a superset of A. For example, my table structures look like this: Person: id | name 1 | John Doe 2 | Jane Roe 3 | John Smith Attribute: id | attr_name 1 | Sex 2 | Eye Color ValidValue: id | attr_id | value_name 1 | 1 | Male 2 | 1 | Female 3 | 2 | Blue 4 | 2 | Green 5 | 2 | Brown PersonAttributes id | person_id | attr_id | value_id 1 | 1 | 1 | 1 2 | 1 | 2 | 3 3 | 2 | 1 | 2 4 | 2 | 2 | 4 5 | 3 | 1 | 1 6 | 3 | 2 | 4 In JPA, I have entities built for all of these tables. What I'd like to do is perform a search for all entities matching a given set of attribute-value pairs. For instance, I'd like to be able to find all males (John Doe and John Smith), all people with green eyes (Jane Roe or John Smith), or all females with green eyes (Jane Roe). I see that I can already take advantage of the fact that I only really need to match on value_id, since that's already unique and tied to the attr_id. But where can I go from there? I've been trying to do something like the following, given that the ValidValue is unique in all cases: select distinct p from Person p join p.personAttributes a where a.value IN (:values) Then I've tried putting my set of required values in as "values", but that gives me errors no matter how I try to structure that. I also have to get a little more complicated, as follows, but at this point I'd be happy with solving the first problem cleanly. However, if it's possible, the Attribute table actually has a field for default value: id | attr_name | default_value 1 | Sex | 1 2 | Eye Color | 5 If the value you're searching on happens to be the default value, I want it to return any people that have no explicit value set for that attribute, because in the application logic, that means they inherit the default value. Again, I'm more concerned about the primary question, but if someone who can help with that also has some idea of how to do this one, I'd be extremely grateful.

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