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  • Rails: Serializing objects in a database?

    - by keruilin
    I'm looking for some general guidance on serializing objects in a database. What are serialized objects? What are some best-practice scenarios for serializing objects in a DB? What attributes do you use when creating the column in the DB so you can use a serialized object? How to save a serialized object? And how to access the serialized object and its attributes? (Using hashes?)

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  • Is Spring hard compared to Ruby on Rails?

    - by johnny
    If I have no to little experience in either of them, but know enough Java and Ruby to be comfortable, is one framework harder to learn than the other? Is one easier to use for the beginner on these? I know it is hard to answer. Just looking for general thoughts on it.

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  • How to get number of attributes in a java class?

    - by llm
    I have a java class containing all the columns of a database table as attributes (member variables) and corresponding getters and setters. I want to have a method in this class called getColumnCount() that returns the number of columns (i.e. the number of attributes in the class)? How would I implement this without hardcoding the number? I am open to critisims on this in general and suggestions. Thanks.

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  • Issue with ko.observableArray

    - by user1574860
    I am using Knockout plugin. The following is my code. In this i am making getting the ceremony list from the server and then save that list in the array. But the problem is in IniitialCallForCeremonies(). The array is not initializing with the returned array from IniitialCallForCeremonies() function. function CeremonyViewModel() { var self = this; self.Ceremonies = ko.observableArray(InitialCallForCeremonies()); } $(document).ready(function () { ko.applyBindings(new CeremonyViewModel()); }); function InitialCallForCeremonies() { var request = $.ajax({ url: "address", type: "GET", async: false, dataType: "JSON" }).success(function (data) { var tempArray = new Array(); $.each(data, function (index, value) { tempArray.push(new Ceremony(value)); }); return tempArray; }); } function Ceremony(val) { this.Id = val.Id; this.Event = val.Event; this.Date = val.Date; this.Guest = val.Guest; }

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  • Redirect after refreshing update panel

    - by teebot.be
    Hello, Do you think it's possible to refresh an update panel and immediately after redirecting the response (for instance a download) ? I tried this: an invisible button - as an asyncpostbacktrigger a download button - when it is clicked the onclientclick clicks the invisible button the click event on the invisible button refreshes the update panel then the download button click event launches the download (normal postback which launches the download) However for some reason when the invisible button is clicked by the download button client script, it doesn't refresh the update panel.. Do you have an idea why it doesn't work? Or do you have other and cleaner techniques? Here's how the elements are declared: <asp:Button runat="server" ID="ButtonInvisible" Text="" Click="RefreshDisplay" /> <asp:Button runat="server" ID="ButtonDownload" Text="Download" OnClientClick="clickInvisible(this.id)" Click="Download" /><Triggers> <asp:AsyncPostBackTrigger ControlID="ButtonInvisible" /></Triggers> //the javascript <script type="text/javascript" language="javascript"> function clickInvisible(idButton) { document.getElementById('ButtonInvisible').click(); }</script> ' //the methods Download(object source, EventArgs e){Response.Redirect("test.txt")} RefreshDisplay(object source, EventArgs e){ ButtonCancel.Enabled = false;}

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  • "Multi-threading" w/ NSTimers in an iPhone app

    - by MrDatabase
    Say I have two NSTimers in my iPhone app: timer1 and timer2. timer1 calls function1 30 times per second and timer2 calls function2 30 times per second. Assume these two functions are reading and updating the same integer variables. Are there any "multi-threading" issues here? If not how does iPhone OS handle the execution of the two functions (in general)?

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  • jQuery trigger function on change

    - by Michael Pasqualone
    I have the following two slider functions which work well and display like so: I have diskAmount and transferAmount stored in global vars, however what I am now trying to figure out is how do I get the sum of the two to initially show as the monthly fee, and then update when either of the two sliders are changed. So in my screenshot above the initial state will be $24.75, and the fee will update if the sliders change. Can anyone point me in the right direction? I get can the initial fee to show, but can't figure out how to get 1 function to call another function within jQuery. $(function() { $("#disk").slider({ value:3, min: 1, max: 80, step: 1, slide: function(event, ui) { $("#diskamount").val(ui.value + ' Gb'); $("#diskamountUnit").val('$' + parseFloat(ui.value * diskCost).toFixed(2)); } }); // Set initial diskamount state $("#diskamount").val($("#disk").slider("value") + ' Gb'); // Set initial diskamountUnit state diskAmount = $("#disk").slider("value") * diskCost; $("#diskamountUnit").val('$' + diskAmount.toFixed(2)); }); $(function() { $("#data").slider({ value:25, min: 1, max: 200, step: 1, slide: function(event, ui) { $("#dataamount").val(ui.value + ' Gb'); $("#dataamountUnit").val('$' + parseFloat(ui.value * transferCost).toFixed(2)); } }); // Set initial dataamount state $("#dataamount").val($("#data").slider("value") + ' Gb'); // Set initial dataamountUnit state transferAmount = $("#data").slider("value") * transferCost; $("#dataamountUnit").val('$' + transferAmount.toFixed(2)); });

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  • out of memory error , my app's fault?

    - by arnold
    hello all, i have a aplication on the android market , in wich exceptions and errors are catched and sent to me by acra. But i receive quite a lot out of memory errors.. In different kind of classes...some my app, some general java.. Does this always mean there is a problem in my app, or can it also be the phone ran out of memory due to a other process? Will users also get a fc dialog ? thnks

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  • jquery cousin element

    - by salmane
    I am trying to locate the closest element that contains a class....this is in an effort to find the "cousin" of the current element that i have.. the following did not work : $('myelement').closest ('*:has(.class1)').find('class_cousin') I am using the * in closest since i am not sure what type element is the one i am looking for nor do I know if it has any classes or ID ( i am trying to keep it general for a plugin) any idea how I could do it? thank you

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  • Handle submission of forms created dynamically having same class

    - by user1504383
    i am creating a form for users to comment on each posts displayed through a loop and the form for commenting is also in the same loop. Now i want each comment to be submitted via jquery ajax but each time its taking into account only the first form . Here is my code:- while($row=mysql_fetch_array($result)) { ?> <?=$row['title']?> <h4>Add commment </h4> <form class="add_comment" method="post"> <div style="display:none;"><input type="text" name="id" class="id" value="<?=$row['id']?>"/></div> <input type="text" name="comment" class="comment"/> <input type="submit" name="submit" value="add" class="submit"/> </form> <?php } ?> And my jquery goes here $("form.add_comment").submit(function(event) { event.preventDefault(); var comment =$('.comment').attr('value'); var id =$('.id').attr('value'); $.ajax({ type: "POST", url: "/add_comment", data: "comment="+comment+"&id="+id, success: function() { location.reload(); } }); return false; });`enter code here` i understood the error that it selects the first one by default but couldnt fix it up plz help me

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  • REST services - exposing non-data "actions"

    - by ctacke
    I understand how to use REST for doing general entity interactions - using urls names to map to entities and the HTTP verbs to map to actions on those entities. But what is the generally accepted way of looking at "actions" more like RPC? For example, let's say I want to send a command for the device to reset? There's no real "entity" here or do I do something like POST to http://mydevice/device/reset?

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  • displaying another html content in div on ajax success

    - by Manish
    gameLike.jsp <div class="gameLikeStatus"> <a href="likeit" class="likeitlink">likeit</a> </div> var dataString = 'elementId='+ '<s:property value="id"/>'+ '&elementType=' + 'games'; $(document).ready(function(){ $('a#likeitlink').bind('click',function(event){ event.preventDefault(); $.ajax({ type: "POST", url: "likeit", dataType: "text html", data: dataString, success: function() { $.post('isLiked',dataString, function(data) { alert(data);//1 $('#gameLikeStatus').html(data); }); } }); }); }); in second.jsp contains a link <a href="unlikeit" class="Unlikeitlink">likeit</a> Here I am liking the element and after like it should display <a href="unlikeit" class="Unlikeitlink">likeit</a> instead of <a href="likeit" class="likeitlink">likeit</a> at <div class="gameLikeStatus"></div> in gameLike.jsp, alert(data);//1 is showing <a href="unlikeit" class="Unlikeitlink">likeit</a> this data but $('#gameLikeStatus').html(data); showing nothing. How to resolve this?

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  • Issue pushing object into an array JS

    - by Javacadabra
    I'm having an issue placing an object into my array in javascript. This is the code: $('.confirmBtn').click(function(){ //Get reference to the Value in the Text area var comment = $("#comments").val(); //Create Object var orderComment = { 'comment' : comment }; //Add Object to the Array productArray.push(orderComment); //update cookie $.cookie('order_cookie', JSON.stringify(productArray), { expires: 1, path: '/' }); }); However when I print the array this is the output: Array ( [0] => Array ( [stockCode] => CBL202659/A [quantity] => 8 ) [1] => Array ( [stockCode] => CBL201764 [quantity] => 6 ) [2] => TEST TEST ) I would like it to look like this: Array ( [0] => Array ( [stockCode] => CBL202659/A [quantity] => 8 ) [1] => Array ( [stockCode] => CBL201764 [quantity] => 6 ) [2] Array( [comment] => TEST TEST ) I added products to the array in a similar way and it worked fine: var productArray = []; // Will hold order Items $(".orderBtn").click(function(event){ //Check to ensure quantity > 0 if(quantity == 0){ console.log("Quantity must be greater than 0") }else{//It is so continue //Show the order Box $(".order-alert").show(); event.preventDefault(); //Get reference to the product clicked var stockCode = $(this).closest('li').find('.stock_code').html(); //Get reference to the quantity selected var quantity = $(this).closest('li').find('.order_amount').val(); //Order Item (contains stockCode and Quantity) - Can add whatever data I like here var orderItem = { 'stockCode' : stockCode, 'quantity' : quantity }; //Check if cookie exists if($.cookie('order_cookie') === undefined){ console.log("Creating new cookie"); //Add object to the Array productArray.push(orderItem);

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  • youtube video on Mac os?

    - by Mahmoud
    I have inserted a video from youtube into a DIV tag, used the actual "embed" code found on youtube site. and used jquery to show/hide the div. when activated, the flash video shows perfectly in the div, when clicked it plays as usual the only problem i have is when someone using a Mac, and clicks on play, the flash video disappears. this happened on many Mac computers regardles of the browser being in use ( none Firefox neither Safari are working ) although i have tested it on all general browsers on windows and it works fine

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  • Validating entered user data

    - by msfanboy
    Hello, this is a general question but I do a desktop application. Should I check for example the firstname exceeding 50 chars or is this a matter of taste? Or should I check for 50 chars because the user could flood my database with 10000000 chars ?

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  • What areas of computer science are particularly relevant to mobile development?

    - by MalcomTucker
    This isn't a platform specific question - rather I'm interested in the general platform independent areas of computer science that are particularly relevant to mobile applications development. For example, things like compression techniques, distributed synchronisation algorithims etc.. what theoretical concepts have you found relevant, useful or enabling when building mobile apps?

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  • Custom collision

    - by bali182
    I was recently assigned to create a siple game using the Corona SDK. The main pillar of the game would be a simple event: the user should put a ball in a basket, and I should be able to handle this event. Here is a picture for better understanding: I successfully managed to create the collision shape for the basket, but i have trouble with the collision of the inside of this basket. My first thought was the following: create a new shape size and position it to fit the "belly" of this basket add it to the physics-world, and listen to the collision. With hybrid drawing it looks like this: But there is a problem: if i add this shape to the physics, it wouldn't let the ball fall into the, basket, it will handle this shape as a solid object as well. So my question is: How could I get this custom object to collide, without blocking the ball to fall through it? I have read a lots of forum post with similar questions but none of them got a proper answer. There must be a way to do this in an elegant way. And one note: Please don't suggest checking the collision manually, with rectangle intersection, because in this simple case it would work, but later I may need to change the shape of the basket, and then it will be useless!

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  • Portable C++ IDE

    - by Click Ok
    I want a portable C++ IDE for general development, and too to develop basic Windows GUI applications. In my research, I've found this (with latest version date): CodeLite IDE (2010-04-02) Code::Blocks (2008-02-28) Bloodshed Dev-C++ (2005-02-22) NetBeans (2009-12-10) Ultimate++ (2010-03-16) Qt Creator (2010-02-01) But I don't know if some these IDE's supports Windows GUI development (or Cross Platform GUI development) or if can be Portable (NetBeans can be portable).

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  • visibility false, XML, as3

    - by pixelGreaser
    Hey, I'm using external XML to set flash vars. Alpha works, but not Visibility. How do I get my swf to respond to visibility? Thanks. XML <?xml version="1.0" encoding="utf-8"?> <SESSION> <BGv TITLE="visible true">false</BGv> <BGa TITLE="alpha 50 percent">.5</BGa> </SESSION> SWF //LISTEN AND LOAD XML var myXML:*; var myLoad:URLLoader = new URLLoader(); myLoad.load(new URLRequest("visible.xml")); myLoad.addEventListener(Event.COMPLETE, parseXML); //PARSE XML function parseXML(e:Event):void { myXML = new XML(e.target.data); //MY TEST var bgA:*; var bgV:*; trace(myXML.BGa.text()); trace(myXML.BGv.text()); bgA =(myXML.BGa.text()); bgV =(myXML.BGv.text()); //MY OBJECT bg.alpha = bgA;//This works great bg.visible = bgV;//This has no effect } OUTPUT .5 false

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  • Android onFling not responding

    - by Kevin Moore
    I am new to android first of all so think of any newbie mistakes first I am trying to add a fling function in my code. public class MainGamePanel extends SurfaceView implements SurfaceHolder.Callback, OnGestureListener { private MainThread thread; private Droid droid; private Droid droid2; private static final String TAG = gameView.class.getSimpleName(); private GestureDetector gestureScanner; public MainGamePanel(Context context){ super(context); getHolder().addCallback(this); droid = new Droid(BitmapFactory.decodeResource(getResources(), R.drawable.playerbox2), 270, 300); droid2 = new Droid(BitmapFactory.decodeResource(getResources(), R.drawable.playerbox2), 50, 300); thread = new MainThread(getHolder(), this); setFocusable(true); gestureScanner = new GestureDetector(this); } public boolean onTouchEvent(MotionEvent event){ return gestureScanner.onTouchEvent(event); } @Override protected void onDraw(Canvas canvas){ canvas.drawColor(Color.BLACK); droid.draw(canvas); droid2.draw(canvas); } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { droid.setX(50); droid.setY(50); Log.d(TAG, "Coords: x=" + e1.getX() + ",y=" + e2.getY()); return true; } @Override public boolean onDown(MotionEvent e) { droid2.setX((int)e.getX()); droid2.setY((int)e.getY()); Log.d(TAG, "Coords: x=" + e.getX() + ",y=" + e.getY()); return false; } I got the gestureListener to work with: onDown, onLongPress, and onShowPress. But i can't get any response with onFling, onSingleTapUp, and onScroll. What mistake am I making? does it have to do with views? I don't know what code would be useful to see.... so any suggestions would be much appreciated. Thank You!

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  • Possible ways of representing data in memory (.net)

    - by This is it
    Hi What are the possible ways of representing data in memory in .Net (or in general)? It would be great if data could be sorted and looked up by key (or multiple keys). We are thinking to use collections, arrays, list of collections/arrays. One object would be in several collections (one sorted asc, other desc, etc.). Maybe this is not a good idea, and we would like to hear some other possible solutions. Thank you

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