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  • What's the Difference Between These Two Ruby Class Initialization Definitions?

    - by michaelmichael
    I'm working through a book on Ruby, and the author used a slightly different form for writing a class initialization definition than he has in previous sections of the book. It looks like this: class Ticket attr_accessor :venue, :date def initialize(venue, date) self.venue = venue self.date = date end end In previous sections of the book, it would've been defined like this: class Ticket attr_accessor :venue, :date def initialize(venue, date) @venue = venue @date = date end end Is there any functional difference between using the setter method, as in the first example, vs. using the instance variable as in the second? They both seem to work. Even mixing them up works: class Ticket attr_accessor :venue, :date def initialize(venue, date) @venue = venue self.date = date end end

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  • PHP Global variable in class is reset

    - by Robert
    I have a web form that manipulates records in a MySQL database. I have a method for displaying an edit interface for both creating new records and editing them if ($_POST['new_page']) { print "<h2>Create new page</h2>\n"; $isNew=1; $this->EditForm(); } else if($_POST['edit']){ print "<h2>Edit page</h2>\n"; $isNew=0; $this->EditForm(); } I am trying to use the global variable $isNew to determine where a record is to be added or updated. However, whenever my SaveChanges() function is run, $isNew is always 0. $isNew is declared immediately after the class declaration, outside all of the functions. class Editor{ public $isNew;

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  • Oracle Forms 6i master-detail question from a painfully new newbie

    - by Murasaki
    Hello, I have a form that contains 3 blocks (block a, b, c). There is a master-detail relationship between b (detail) and c (master). Data-flow: you enter an ID in block a, which in turn populates block c and corresponding details in block b. Control goes immediately to block c. Objective: I need to be able to update details of block b. Issue: I cannot navigate to block b. Keep in Mind: --In the Property Palette Keyboard Navigable is set to "Yes" --Insert Allowed and Update Allowed are set to "Yes." If someone could respond ASAP I would really appreciate it. Thank you.

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  • create a dataset by using modulo division method

    - by ayoom
    create a dataset with 101 integers. Use the modulo division method of hashing to store the random data values into hash tables with table sizes of 7, 51, and 151. Use the linear probing and quadratic method of collision resolution. Print out the tables after the data values have been stored. Search for 10 different values in each of the three hash tables, counting the number of comparisons necessary. Print out the number of comparisons necessary in each case, in tabular form.

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  • Asynchronous database update in Django?

    - by Mark
    I have a big form on my site. When the users fill it out and submit it, most of the data just gets dumped to the database, and then they get redirected to a new page. However, I'd also like to use the data to query another site, and then parse the results. That might take a bit longer. It's not essential that the user sees these results right away, so I was wondering if it's possible to asynchronously call a function that will handle this, and then return an HttpResponse from my view like usual without making them wait? If so... how? Any particular libraries I should look at?

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  • Serving large generated files using Google App Engine?

    - by John Carter
    Hiya, Presently I have a GAE app that does some offline processing (backs up a user's data), and generates a file that's somewhere in the neighbourhood of 10 - 100 MB. I'm not sure of the best way to serve this file to the user. The two options I'm considering are: Adding some code to the offline processing code that 'spoofs' it as a form upload to the blob store, and going thru the normal blobstore process to serve the file. Having the offline processing code store the file somewhere off of GAE, and serving it from there. Is there a much better approach I'm overlooking? I'm guessing this is functionality that isn't well suited to GAE. I had thought of storing in the datastore as db.Text or Dd.Blob but there I encounter the 1 MB limit. Any input would be appreciated,

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  • Extjs 3.4 - Button Icon does not show or does not center

    - by Chris
    I want to fill a button with an icon I created but whatever I have tried just seems to put the icon either half cut off and way left, or it doesn't show at all. I've been trying different combinations of CSS and the icon, iconcls, cls button options. I was following the Ext 3 buttons example page but that doesn't seem to display anything for me... This code is an item inside my form panel (I try to replicate this with different buttons in the panel) { xtype: 'container', layout: { type: 'table', columns: 2, tableAttrs: { cellspacing: 5 } }, // padding: 5, pack: 'center', align: 'middle', items: [{ xtype: 'button', width: 40, // scale: 'medium', ref: '../drawToolsBtn', tooltip: 'Drawing Tools', icon: 'img/draw.png', iconAlign: 'top', baseCls: 'x-plain', // iconCls: 'drawBtn', enableToggle: true, // padding: 3, toggleHandler: function(btn, state) { this.showDrawToolsWin(state); }, scope: this },{ xtype: 'label', // columnWidth: 1, // remainder of container padding: 3, text: 'Click button to open Drawing Tools Menu' }] } CSS -------------------- .drawBtn{ background: url(../img/draw.png) !important; } Thank you for any help!

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  • Send XML String as Response

    - by Sri Kumar
    Hello All, I am getting my Request from a third party application(different domain) to my ASP application. I am handling the request and doing the business part in my application and as a acknowledgement I need to send XML string as Response to the same Page which POSTED the request to my Application. I was successful in retrieving the input from Request using the following code NameValueCollection postPageCollection = Request.Form; foreach (string name in postPageCollection.AllKeys) { ... = postPageCollection[name]); } But i am not sure how to send back the response along with XML String to the site(different domain)? EDIT: How to get the URL from where the POST happened.

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  • Visual Studio Error: An item with the same key has already been added

    - by PaN1C_Showt1Me
    When I'm trying to change the default Image of a Control on Windows Forms in Form Designer (no matter where on which control) I get this error: Error message: An item with the same key has already been added I tried to delete and recreate the Resources.resx file.. I assured that only 1 resx file with these keys exist.. (in fact that's my only resource file) but it still does not work. I have som strings in it and some images. That's all. Any idea?

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  • Data Warehouse: One Database or many?

    - by drrollins
    At my new company, they keep all data associated with the data warehouse, including import, staging, audit, dimension and fact tables, together in the same physical database. I've been a database developer for a number of years now and this consolidation of function and form seems counter to everything I know. It seems to make security, backup/restore and performance management issues more manually intensive. Is this something that is done in the industry? Are there substantial reasons for doing or not doing it? The platform is Netezza. The size is in terabytes, hundreds of millions of rows. What I'm looking to get from answers to this question is a solid understanding of how right or wrong this path is. From your experience, what are the issues I should be focused on arguing if this is a path that will cause trouble for us down the road. If it is no big deal, then I'd like to know that as well.

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  • Find the set of largest contiguous rectangles to cover multiple areas

    - by joelpt
    I'm working on a tool called Quickfort for the game Dwarf Fortress. Quickfort turns spreadsheets in csv/xls format into a series of commands for Dwarf Fortress to carry out in order to plot a "blueprint" within the game. I am currently trying to optimally solve an area-plotting problem for the 2.0 release of this tool. Consider the following "blueprint" which defines plotting commands for a 2-dimensional grid. Each cell in the grid should either be dug out ("d"), channeled ("c"), or left unplotted ("."). Any number of distinct plotting commands might be present in actual usage. . d . d c c d d d d c c . d d d . c d d d d d c . d . d d c To minimize the number of instructions that need to be sent to Dwarf Fortress, I would like to find the set of largest contiguous rectangles that can be formed to completely cover, or "plot", all of the plottable cells. To be valid, all of a given rectangle's cells must contain the same command. This is a faster approach than Quickfort 1.0 took: plotting every cell individually as a 1x1 rectangle. This video shows the performance difference between the two versions. For the above blueprint, the solution looks like this: . 9 . 0 3 2 8 1 1 1 3 2 . 1 1 1 . 2 7 1 1 1 4 2 . 6 . 5 4 2 Each same-numbered rectangle above denotes a contiguous rectangle. The largest rectangles take precedence over smaller rectangles that could also be formed in their areas. The order of the numbering/rectangles is unimportant. My current approach is iterative. In each iteration, I build a list of the largest rectangles that could be formed from each of the grid's plottable cells by extending in all 4 directions from the cell. After sorting the list largest first, I begin with the largest rectangle found, mark its underlying cells as "plotted", and record the rectangle in a list. Before plotting each rectangle, its underlying cells are checked to ensure they are not yet plotted (overlapping a previous plot). We then start again, finding the largest remaining rectangles that can be formed and plotting them until all cells have been plotted as part of some rectangle. I consider this approach slightly more optimized than a dumb brute-force search, but I am wasting a lot of cycles (re)calculating cells' largest rectangles and checking underlying cells' states. Currently, this rectangle-discovery routine takes the lion's share of the total runtime of the tool, especially for large blueprints. I have sacrificed some accuracy for the sake of speed by only considering rectangles from cells which appear to form a rectangle's corner (determined using some neighboring-cell heuristics which aren't always correct). As a result of this 'optimization', my current code doesn't actually generate the above solution correctly, but it's close enough. More broadly, I consider the goal of largest-rectangles-first to be a "good enough" approach for this application. However I observe that if the goal is instead to find the minimum set (fewest number) of rectangles to completely cover multiple areas, the solution would look like this instead: . 3 . 5 6 8 1 3 4 5 6 8 . 3 4 5 . 8 2 3 4 5 7 8 . 3 . 5 7 8 This second goal actually represents a more optimal solution to the problem, as fewer rectangles usually means fewer commands sent to Dwarf Fortress. However, this approach strikes me as closer to NP-Hard, based on my limited math knowledge. Watch the video if you'd like to better understand the overall strategy; I have not addressed other aspects of Quickfort's process, such as finding the shortest cursor-path that plots all rectangles. Possibly there is a solution to this problem that coherently combines these multiple strategies. Help of any form would be appreciated.

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  • Determine the lat lngs of markers within a polygon

    - by subh
    I have a google maps app which plots markers as it loads. One of the new requirment is to to add a Polygon overlay encompassing a selection of markers by the user. I was able to achieve that using the Geometry Controls of the GMaps Utility Library Now, the next step is to form a group of the selected markers for which I would need to determine if the lat lngs of the markers falls within the lat lngs of the polygon? Is there a way to determine the lat lngs of a polygon and compute if the marker's lat lng is within its boundaries?

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  • Dojo JSON call back always returns an error

    - by Sunny
    Hi Guys, I am using Dojo and making a AJAX call to a JAVA Class and trying to get the output of the program to a Alert box to the client. var showResult = function(result){ console.log("Showing Result()"); var store = new dojo.data.ItemFileReadStore({ data: result}); console.dir(store); store.fetch( { onItem: function(data) { alert("Hie"); }, onError: function(error,request){ alert("ERROR");} }); }; This is my code, showResult basically is call back function from xhr request. I can see console.dir(store) printed onto Firebug but the fetch function always returns the onError block. My store array is of the form {info="Test Message"} and I need to retrieve "Test Message" and display it in a Alert box. Any help?

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  • Inheritance in kohana

    - by Binaryrespawn
    Hi all, I have recently started to use Kohana and I know inheritance is in infancy stages at the moment. The work around is using a $_has_one annotation on the child class model. In may case i have "page" as the parent of "article". I have something like, protected $_has_one = array('mypage'=>array('model'=>'page', 'foreign_key'=>'id')); In my controller, I have an action which queries the database. In this query I am trying to access fields form the parent of "article" which is the "page". $n->articles=ORM::factory('article')->where('expires','=',0) ->where('articledate','<',date('y-m-d')) ->where('expirydate','>',date('y-m-d')) ->where('mypage->status','=','PUBLISHED') ->order_by('articledate','desc') ->find_all(); The status column resides in the page table and my query is generating an error to the effect of "cannot find status", clearly because it belongs to the parent. Any ideas ?

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  • Resources for memory management in embedded application

    - by Elazar Leibovich
    How should I manage memory in my mission critical embedded application? I found some articles with google, but couldn't pinpoint a really useful practical guide. The DO-178b forbids dynamic memory allocations, but how will you manage the memory than? preallocate everything in advance and send a pointer to each function that needs allocation? Allocate it on the stack? Use a global static allocator (but then it's very similar to dynamic allocation)? Answers can be of the form of regular answer, reference to a resource, or reference to good opensource embedded system for example. clarification: The issue here is not whether or not memory management is availible for the embedded system. But what is a good design for an embedded system, to maximize reliability.

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  • How can I get Text property to initialize to the objects name at design time?

    - by cyclotis04
    When you add a label to the form from the toolbox, its text defaults to the item's name (label1, label2, etc). How can I make this happen with a custom control? So far, I have the following, which allows me to change the text through the property window: private string _text; [BrowsableAttribute(true)] public override string Text { get { return _text; } set { _text = value; lblID.Text = _text; } } Apparently the above code works as is, but I'm not sure why. Does Text default to the object's name automatically? The question still stands for other properties which don't override Text.

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  • Mysql retrieve polygon data

    - by dskanth
    Hi, i have been developing a site that stores spatial data in mysql database, like that of buildings, gardens, etc. in the form of polygons (latitudes and longitudes). I want to know how to retrieve polygon data in mysql. I have seen this sample query to insert a polygon data: http://amper.110mb.com/SPAT/mysql_initgeometry2.htm But now i want to know how to retrieve data from the table, based on certain constraints like: "where latitude < 9.33 and longitude > 22.4" Also how do i find whether a point lies inside or outside of a polygon

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  • c# Dynamically generated controls issue.

    - by Thomas
    Good Day I have a form with a panel docked in it. I then dynamically create 15 panels (named: panel_n) and 15 pictureboxes (named: picturebox_n) on the primary panel (named ContainerPanel). When dragging the any picturebox over a panel (panel_n) created using the relevant mouse events. I would like to get the panel's name that the picture box was dragged over. The mouse cursor seems to be captured. I have tried creating a IMessageFilter interface, but there are still no events that trigger when dragging one of the pictureboxes over any one of the panels. The ClientRectangle.IntersectsWith function also does not work as the co-ords are always 0,0. All I need is the panel name where the picturebox was dragged over (preferably on the mouseup event)

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  • Flexibility starting to develop applications and DB

    - by kristaps
    Hi! First of all I want to say some info for admins. This post can help to all DBA and developers. Hope You don't close this. I'm writing about widespread problem I'm writing master work and I want that You will had little time to answer my questions in my form. These questions are about db structures. Visit here: http://spreadsheets.google.com/embeddedform?formkey=dEhmOWFGb2twWVFreWJwWXp2U3c5a1E6MQ After I summarized results, I insert it in new post and developers can choose which structure to use to reach needed requirements developing new applications. I think that my test will help a lot of people. Best regards, Kristaps

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  • UploadFileAsync not asynchronous?

    - by a2h
    Aight, did a bit of Googling and searching here, the only question I found related was this, although the only answer it had wasn't marked as accepted, is old and is confusing. My problem is basically what I've said in the title. What happens is that the GUI freezes while the upload is in progress. My code: // stuff above snipped public partial class Form1 : Form { WebClient wcUploader = new WebClient(); public Form1() { InitializeComponent(); wcUploader.UploadFileCompleted += new UploadFileCompletedEventHandler(UploadFileCompletedCallback); wcUploader.UploadProgressChanged += new UploadProgressChangedEventHandler(UploadProgressCallback); } private void button1_Click(object sender, EventArgs e) { if (openFileDialog1.ShowDialog() == DialogResult.OK) { string toUpload = openFileDialog1.FileName; wcUploader.UploadFileAsync(new Uri("http://anyhub.net/api/upload"), "POST", toUpload); } } void UploadFileCompletedCallback(object sender, UploadFileCompletedEventArgs e) { textBox1.Text = System.Text.Encoding.UTF8.GetString(e.Result); } void UploadProgressCallback(object sender, UploadProgressChangedEventArgs e) { textBox1.Text = (string)e.UserState + "\n\n" + "Uploaded " + e.BytesSent + "/" + e.TotalBytesToSend + "b (" + e.ProgressPercentage + "%)"; } }

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  • Using static strings to define input field names in JSPs - good idea or not?

    - by Derek Clarkson
    Hi all, I've just be asked to work on a large portal project and have been looking through the established code. I keep finding this in the jsps: <input class="portlet-form-button" name="<%=ModifyUserProfile.FORM_FIRST_TIME_LOGIN_SUBMIT%>" type="submit" ... The authors are using static strings defined in classes to define the names of input fields and buttons in jsp forms. I've never seen this done before and was wondering if this is common practice. I'm inclined to think not, but I'm asking because, apart from centralising names which I would have thought are not likely to change, I can't see the reason why. Any thoughts on this?

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  • dijit hovering MenuItem issue

    - by John
    I have a dijit.layout.TabContainer on my form. I resize the browser window in such a way that all tabs won't fit in a single screen. In this case dijit automatically adds a drop-down button at the right end of the TabContainer (I get this for free). If I click on the drop-down button then I get the full List of Tab Names. Hovering over the List of Tab Names (which is in fact a collection of menu items) it blanks out the menu item name which I'm currently over. e.g. Full List: Tab1 Tab2 Tab3 Hovering over Tab2 I get: Tab1 Tab3 I get the same issue with any other dijit.Menu, dijit.MenuItem AND I get the same issue on IE, Firefox, Chrome. I haven't tested on any other browser. Thanks.

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  • PHP - Filter some words

    - by bob
    I want to filter some reserved word on my title form. $adtitle = sanitize($_POST['title']); $ignore = array('sale','buy','rent'); if(in_array($adtitle, $ignore)) { $_SESSION['ignore_error'] = '<strong>'.$adtitle.'</strong> cannot be use as your title'; header('Location:/submit/'); exit; How to make something like this. If user type Car for sale the sale will detected as reserved keyword. Now my current code only detect single keyword only.

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  • So, I guess I can't use "&&" in the Python if conditional. Any help?

    - by Sergio Tapia
    Here's my code: # F. front_back # Consider dividing a string into two halves. # If the length is even, the front and back halves are the same length. # If the length is odd, we'll say that the extra char goes in the front half. # e.g. 'abcde', the front half is 'abc', the back half 'de'. # Given 2 strings, a and b, return a string of the form # a-front + b-front + a-back + b-back def front_back(a, b): # +++your code here+++ if len(a) % 2 == 0 && len(b) % 2 == 0: return a[:(len(a)/2)] + b[:(len(b)/2)] + a[(len(a)/2):] + b[(len(b)/2):] else: #todo! Not yet done. :P return I'm getting an error in the IF conditional. What am I doing wrong?

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