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  • Rails nil can't be coerced into Float

    - by alex
    After adding items, attempting to view my cart leads me to this error: nil can't be coerced into Float with the math line in this method in my line_item model highlighted: def total_price product.price * quantity end line items create action def create product = Product.find(params[:product_id]) @line_item = @cart.add_product(product.id) @line_item.quantity = params[:quantity] view <div id= "text_field"><%= text_field_tag 'quantity' %> </div> <%= button_to 'Add to Cart', line_items_path(:product_id => product) %> This has held me back for a couple days. (I'm new). Thanks.

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  • Redirecting a page when session expires using asp.net mvc

    - by Naidu
    In my web.config file i have the following code: <system.web> <assemblies> <authentication mode="Forms"> <forms loginUrl="/Account/Login" slidingExpiration="true" timeout="1" /> </authentication> <sessionState timeout="1"></sessionState> </assemblies> </system.web> And I have main page Project and in that there will sub pages. I have given the [Authorize] attribute for each view index method. After the session complete when we select any view then the page inside the project main page will be redirecting. But I want the whole page to be redirected. Any Help is appreciated.

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  • Why does my UI controls work on iPhone but not iPad?

    - by Andrew
    I have an iPhone app, which consists of a table view containing various custom UITableViewCells, with UISlider and UISwitch controls. When running the app on the iphone, I can move the slider and switches contained in each of the table cells. When I run the same app on the iPad. I can not. None of the controls within the table view will respond to touches. I have checked 'User Interaction Enabled' within the Interface Builder. Anybody got any suggestions of where I should be looking for the cause of different behavior between the iPhone and iPad, in respect to UIControls.

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  • Drupal Views: Render Null Result for Relationship as 0

    - by Kyle S
    I have a View configured in Drupal to return nodes, sorting them by their average vote in descending order. For the purpose of the View, the value of the average votes is a Relationship. I noticed that nodes with no votes are displayed after nodes with a negative average. Nodes with no votes should have an average of 0, but I believe the MySQL JOIN is causing NULL values to be returned (as there are no matching rows in the joined table, since a row is created after the first vote is cast for that item). I discovered that with MySQL it is possible to output all values that are NULL in a column as another value with IFNULL(column_name,'other value'). I feel like I would need to modify the Views module in order to obtain this functionality, but I'm hoping that there is some sort of option that returns NULL values in a relation (a relation doesn't exist for the item) as 0 instead of NULL, so that I can properly sort the nodes. The modules I am using include Views, Voting API, Vote Up/Down, and CTools. Thanks.

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  • Detecting when a process has finished (but not exited)

    - by Egwor
    I have a program that's run in unix (that I have no control over) that when finished prints 'Completed successfully' but does not exit. I want to automatically detect when the process finishes (by checking the output of the command), so that I can kill the process and so that I can proceed do other activities. The complexity comes because I want to be able to run multiples of these scripts concurrently. (One activity I need to do requires the script to be called with various inputs, but each time the script runs it takes a while to return, and so I want to do them in parallel) Has anyone done something similar to this? I could redirect the stderr and stdout output of the command to a temporary file which has a random file name, then tail the file and pipe to grep for the end conditions (I.e. the certain log lines). The problem is, surely tail -f would keep running, and so it would never exit. Should I poll? If so, what's the best approach?

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  • How to read modelstate errors when returned by Json?

    - by learning
    How can I display modelstate errors returned by Json ? I want to do somthing like that... if (!ValidateLogOn(Name, currentPassword)) { ModelState.AddModelError("_FORM", "Username or password is incorrect."); //Return a json object to the javascript return Json(new { ModelState }); } What must be my code in the view to read the modelstate errors and display them? My actual code in the view is as follows to read the Json values: function createCategoryComplete(e) { var obj = e.get_object(); alert(obj.Values); }

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  • Android : How to start an activity in a tab?

    - by Miya
    Hi, I am using tabs in my application. I have 3 tabs : home, services, contact us. In the 'home tab', there is 'login button' and my requirement is when I click the login button, it should display the view for 'login' in the same tab itself. That means it should start another activity (login.class) and display corresponding view (login.xml). And the tabs should be displayed at the top as before. But when I click the login button, it should start login activity, but the tabs are disappeared. How can I start an activity in the same tab itself? Please help me. Thank you...

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  • GitHub: searching through older versions of files

    - by normski
    I know that using GitHub I can search through all the current versions of my files in a repo. However, I would also like to search through the older versions of my repo files. For example, say, I used to have a function called get_info() in my code, but deleted it several versions ago, is it possible to search for get_info and find the code. If it is not possible using GitHub, is it possible from the git command line? EDIT Thanks to @Mark Longair for showing how this can be done from the git command line. If it's not possible in GitHub it would be a great feature to have.

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  • Controller should not have domain logic. How faithful should one adhere to this tenet?

    - by Hao
    Quoting from page 49 of Pro ASP.NET MVC book It is certainly possible to put domain logic into a controller, even though you shouldn’t, just because it seems like it will work anyway. It’s easy to avoid this if you imagine that you have multiple UI technologies (e.g., an ASP.NET MVC application plus a native iPhone application) operating on the same underlying business domain layer (and maybe one day you will!). With this in mind, it’s clear that you don’t want to put domain logic into any of the UI layers. Why he seems to contradict himself on page 172? [HttpPost] public ActionResult CheckOut(Cart cart, ShippingDetails shippingDetails) { // Empty carts can't be checked out if (cart.Lines.Count == 0) ModelState.AddModelError("Cart", "Sorry, your cart is empty!"); if (ModelState.IsValid) { orderSubmitter.SubmitOrder(cart, shippingDetails); cart.Clear(); return View("Completed"); } else // Something was invalid return View(shippingDetails); } Related to: How to avoid placing domain logic in controller?

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  • NSTableview weird error

    - by Matt S.
    I followed the guide here, but for some reason, the table view shows this in the console when I attempt to scroll through it: -[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x100227710

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  • not all data insert in convert from excell to database

    - by Gold
    hi i have this code: ConnectString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + ExcelFile + ";Extended Properties=\"Excel 12.0 Xml;HDR=No\""; SheetName = SheetName.Substring(0, SheetName.Length - 5); OleDbConnection Connection = new OleDbConnection(); Connection.ConnectionString = ConnectString; try {Connection.Open();} catch (Exception EX) { MessageBox.Show(EX.Message); } OleDbDataAdapter Command = new OleDbDataAdapter("SELECT * FROM [" + SheetName + "$]", Connection); DataSet ExcelData = new DataSet(); try {Command.Fill(ExcelData);} catch (Exception EX) { MessageBox.Show(EX.Message); } finally { if (Connection.State != ConnectionState.Closed) Connection.Close(); } but not all the data in column 1 insert - i get empty data why ? what can be wrong ? thank's in advance

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  • How do I fix this warning in my mx:request tag?

    - by invertedSpear
    I'm running an HTTPService with the following request: <mx:request xmlns=""> <view>{myViewStack.selectedChild.name}</view> </mx:request> The idea being to pass which child is selected on the viewstack to the php page, and then get that back so I can run some logic based on which child of the viewstack was selected at the time. Everything seems to work, but I get the following warning: Data binding will not be able to detect assignments to "name". This doesn't seem to be causing any trouble, but I know warnings usually mean that I am not following the best practice. How can I fix this? I don't really need this item to be bound, because the name will never change at runtime, but I don't know how else to include it in the request.

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  • ListView GridView and Grid

    - by urema
    Hi, If you have a ListView with its view set as a GridView, which itself contains columns for each month say.....how do I set a template up for the ItemTemplate of the ListView so that each Item will be three rows high, and be inline with the ListView.View's columns? For example different employee recruits over a year.... each month across the top and each employee on the left side, though sub-columned on the employee are three rows "Name", "Address" and "Job Type" say. I know you have to use the IsSharedSizeScope attached property. January February ... Employee1 Name E1 Address E1 Street Job Type Cleaner Employee2 Name ... Address ... Job Type ... Thanks greatly in advance, U.

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  • Preserving NULL values in a Double Variable

    - by Sam
    Hi, I'm working on a vb.net application which imports from an Excel spreadsheet. If rdr.HasRows Then Do While rdr.Read() If rdr.GetValue(0).Equals(System.DBNull.Value) Then Return Nothing Else Return rdr.GetValue(0) End If Loop Else I was using string value to store the double values and when preparing the database statement I'd use this code: If (LastDayAverage = Nothing) Then command.Parameters.AddWithValue("@WF_LAST_DAY_TAG", System.DBNull.Value) Else command.Parameters.AddWithValue("@WF_LAST_DAY_TAG", Convert.ToDecimal(LastDayAverage)) End If I now have some data with quite a few decimal places and the data was put into the string variable in scientific notation, so this seems to be the wrong approach. It didn't seem right using the string variable to begin with. If I use a double or decimal type variable, the blank excel values come across as 0.0. How can I preserve the blank values? Thanks

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  • How to restrict this function from execution in android? Please help

    - by andyfan
    This code is present in one of this activity. I want to restrict addJoke() function from executing if the String variable new_joke is null, has no text or contains just spaces. Here is code protected void initAddJokeListeners() { // TODO m_vwJokeButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { //Implement code to add a new joke here... String new_joke=m_vwJokeEditText.getText().toString(); if(new_joke!=null&&new_joke!=""&&new_joke!=" ") { addJoke(new_joke); } } }); } I don't know why addJoke() function is getting executed even I don't enter any text in EditText field. Please help.

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  • Converting OpenGL coordinates to lower UIView (and UIImagePickerController)

    - by John Qualis
    I am new to OpenGL on the iPhone. I am developing an iPhone app similar to a barcode reader but with an extra OpenGL layer. The bottommost layer is UIImagePickerController, then I use UIView on top and draw a rectangle at certain coordinates on the iPhone screen. So far everything is OK. Then I am trying to draw an OpenGL 3-D model in that rectangle. I am able to load a 3-D model in the iPhone based on this code here - http://iphonedevelopment.blogspot.com/2008/12/start-of-wavefront-obj-file-loader.html I am not able to transform the coordinates of the rectangle into OpenGL coordinates. Appreciate any help. Do I need to use a matrix to translate the currentPosition of the 3-D model so it is drawn within myRect? The code is given below. -(void)setupView:(GLView*)view { const GLfloat zNear = 0.01, zFar = 1000.0, fieldOfView = 45.0; GLfloat size; glEnable(GL_DEPTH_TEST); glMatrixMode(GL_PROJECTION); size = zNear * tanf(DEGREES_TO_RADIANS(fieldOfView) / 2.0); CGRect rect = view.bounds; glFrustumf(-size, size, -size / (rect.size.width / rect.size.height), size / (rect.size.width / rect.size.height), zNear, zFar); glViewport(0, 0, rect.size.width, rect.size.height); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glClearColor(0.0f, 0.0f, 0.0f, 0.0f); NSString *path = [[NSBundle mainBundle] pathForResource:@"plane" ofType:@"obj"]; OpenGLWaveFrontObject *theObject = [[OpenGLWaveFrontObject alloc] initWithPath:path]; Vertex3D position; position.z = -8.0; position.y = 3.0; position.x = 2.0; theObject.currentPosition = position; self.plane = theObject; [theObject release]; } - (void)drawView:(GLView*)view; { static GLfloat rotation = 0.0; glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glColor4f(0.0, 0.5, 1.0, 1.0); // the coordinates of the rectangle are // myRect.x, myRect.y, myRect.width, myRect.height // Do I need to use a matrix to translate the currentPosition of the // 3-D model so it is drawn within myRect? //glOrthof(-160.0f, 160.0f, -240.0f, 240.0f, -1.0f, 1.0f); [plane drawSelf]; }

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  • bash copy with variable

    - by zaf
    I'm trying to copy files to the current directory using a bash script. In order to handle paths that need escaping a variable is used that is escaped and then supplied to the cp command. The cp command is complaining with: usage: cp [-R [-H | -L | -P]] [-fi | -n] [-apvX] source_file target_file cp [-R [-H | -L | -P]] [-fi | -n] [-apvX] source_file ... target_directory I know what that means but I cannot understand why that happens. Here is the code: z="/a/b/c d e f.txt" y=`printf %q "$z"` cp $y x.txt # not working as expected echo cp $y x.txt # output is "cp /a/b/c\ d\ e\ f.txt x.txt"

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  • How to access Oracle system tables from inside of a PL/SQL function or procedure?

    - by mjumbewu
    I am trying to access information from an Oracle meta-data table from within a function. For example (purposefully simplified): CREATE OR REPLACE PROCEDURE MyProcedure IS users_datafile_path VARCHAR2(100); BEGIN SELECT file_name INTO users_datafile_path FROM dba_data_files WHERE tablespace_name='USERS' AND rownum=1; END MyProcedure; / When I try to execute this command in an sqlplus process, I get the following errors: LINE/COL ERROR -------- ----------------------------------------------------------------- 5/5 PL/SQL: SQL Statement ignored 6/12 PL/SQL: ORA-00942: table or view does not exist I know the user has access to the table, because when I execute the following command from the same sqlplus process, it displays the expected information: SELECT file_name FROM dba_data_files WHERE tablespace_name='USERS' AND rownum=1; Which results in: FILE_NAME -------------------------------------------------------------------------------- /usr/lib/oracle/xe/oradata/XE/users.dbf Is there something I need to do differently?

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  • Why does F10 (step over) in Visual Studio 2010 not work?

    - by maycil
    I also tried 2 solution. But It doesn't worked. Go to Tools Options menu in Visual Studio. Go to Debugging General menu item in left pane. In right view you will see and option Step over properties and operators (Managed only). Uncheck this option and then you are all set. and Go to Tools Options menu in Visual Studio. Go to Debugging General menu item in left pane. In right view you will see and option Enable Just My Code (Managed only). Uncheck this option and then you are all set.

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  • UITableView headings shown on top of MBProgressHUD

    - by Chris Ballinger
    So I have a subclass of UITableViewController that loads some data from the internet and uses MBProgressHUD during the loading process. I use the standard MBProgressHUD initialization. HUD = [[MBProgressHUD alloc] initWithView:self.view]; [self.view addSubview:HUD]; HUD.delegate = self; HUD.labelText = @"Loading"; [HUD show:YES]; This is the result: . Is there any way to resolve this issue, or should I just abandon MBProgressHUD? Thanks!

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  • C++ code visualization

    - by bobobobo
    A sort of follow up/related question to this. I'm trying to get a grip on a large code base that has hundreds and hundreds of classes and a large inheritance hierarchy. I want to be able to see the "main veins" of the inheritance hierarchy at a glance - not all the "peripheral" classes that only do some very specific / specialized thing. Visual Studio's "View Class Diagram" makes something that looks like a train and its sprawled horizontally across the screen and isn't very organized. You can't grok it easily. I've just tried doxygen and graphviz but the results are .. somewhat similar to Visual Studio. I'm getting sweet looking call graphs but again too much detail for what I'm trying to get. I need a quick way to generate the inheritance hierarchy, in some kind of collapsible view.

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  • MySQL, PHP, and Apache errors while connecting to DB

    - by cypherdelton
    I'm having two errors when I test the "mysql_connect()" function in php. I just installed PHP and MySQL from scratch. These errors may be related, so I will post them both here: Warning: mysql_connect() [function.mysql-connect]: Headers and client library minor version mismatch. Headers:50158 Library:50518 in /usr/local/apache2/htdocs/index.php on line 6 Warning: mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2) in /usr/local/apache2/htdocs/index.php on line 6 Many websites say to start the mysql server if you are getting error #2. Whenever I execute the command mysqld start --user=mysql I get the error "mysqld: Too many arguments (first extra is 'start'); Adding the "&" to the end of the command makes no difference (I don't know if it is supposed to). Thanks, Cypher Delton

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