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  • Read/Write/Find/Replace huge csv file

    - by notapipe
    I have a huge (4,5 GB) csv file.. I need to perform basic cut and paste, replace operations for some columns.. the data is pretty well organized.. the only problem is I cannot play with it with Excel because of the size (2000 rows, 550000 columns). here is some part of the data: ID,Affection,Sex,DRB1_1,DRB1_2,SENum,SEStatus,AntiCCP,RFUW,rs3094315,rs12562034,rs3934834,rs9442372,rs3737728 D0024949,0,F,0101,0401,SS,yes,?,?,A_A,A_A,G_G,G_G D0024302,0,F,0101,7,SN,yes,?,?,A_A,G_G,A_G,?_? D0023151,0,F,0101,11,SN,yes,?,?,A_A,G_G,G_G,G_G I need to remove 4th, 5th, 6th, 7th, 8th and 9th columns; I need to find every _ character from column 10 onwards and replace it with a space ( ) character; I need to replace every ? with zero (0); I need to replace every comma with a tab; I need to remove first row (that has column names; I need to replace every 0 with 1, every 1 with 2 and every ? with 0 in 2nd column; I need to replace F with 2, M with 1 and ? with 0 in 3rd column; so that in the resulting file the output reads: D0024949 1 2 A A A A G G G G D0024302 1 2 A A G G A G 0 0 D0023151 1 2 A A G G G G G G (both input and output should read one line per row, ne extra blank row) Is there a memory efficient way of doing that with java(and I need a code to do that) or a usable tool for playing with this large data so that I can easily apply Excel functionality..

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  • How to delete duplicate/aggregate rows faster in a file using Java (no DB)

    - by S. Singh
    I have a 2GB big text file, it has 5 columns delimited by tab. A row will be called duplicate only if 4 out of 5 columns matches. Right now, I am doing dduping by first loading each coloumn in separate List , then iterating through lists, deleting the duplicate rows as it encountered and aggregating. The problem: it is taking more than 20 hours to process one file. I have 25 such files to process. Can anyone please share their experience, how they would go about doing such dduping? This dduping will be a throw away code. So, I was looking for some quick/dirty solution, to get job done as soon as possible. Here is my pseudo code (roughly) Iterate over the rows i=current_row_no. Iterate over the row no. i+1 to last_row if(col1 matches //find duplicate && col2 matches && col3 matches && col4 matches) { col5List.set(i,get col5); //aggregate } Duplicate example A and B will be duplicate A=(1,1,1,1,1), B=(1,1,1,1,2), C=(2,1,1,1,1) and output would be A=(1,1,1,1,1+2) C=(2,1,1,1,1) [notice that B has been kicked out]

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  • Looking for the log file on iPhone

    - by zp26
    Hi, I have a problem. I have the code below for save a data on file. I build my app on the device, and run. The result variable is TRUE, but i don't find the file on the my iPhone device. Can you help me? Thank and sorry for my english XP -(void)saveXML:(NSString*)name:(float)x:(float)y:(float)z{ NSMutableData *data = [NSMutableData data]; NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data]; [archiver setOutputFormat:NSPropertyListXMLFormat_v1_0]; [archiver encodeFloat:x forKey:@"x"]; [archiver encodeFloat:y forKey:@"y"]; [archiver encodeFloat:z forKey:@"z"]; [archiver encodeObject:name forKey:@"name"]; [archiver finishEncoding]; NSString* filePath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"XML Position"]; BOOL result = [data writeToFile:filePath atomically:YES]; if(result) [self updateTextView:@"success"]; [archiver release]; }

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  • stdio data from write not making it into a file

    - by user1551209
    I'm having a problem with using stdio commands for manipulating data in a file. I short, when I write data into a file, write returns an int indicating that it was successful, but when I read it back out I only get the old data. Here's a stripped down version of the code: fd = open(filename,O_RDWR|O_APPEND); struct dE *cDE = malloc(sizeof(struct dE)); //Read present data printf("\nreading values at %d\n",off); printf("SeekStatus <%d>\n",lseek(fd,off,SEEK_SET)); printf("ReadStatus <%d>\n",read(fd,cDE,deSize)); printf("current Key/Data <%d/%s>\n",cDE->key,cDE->data); printf("\nwriting new values\n"); //Change the values locally cDE->key = //something new cDE->data = //something new //Write them back printf("SeekStatus <%d>\n",lseek(fd,off,SEEK_SET)); printf("WriteStatus <%d>\n",write(fd,cDE,deSize)); //Re-read to make sure that it got written back printf("\nre-reading values at %d\n",off); printf("SeekStatus <%d>\n",lseek(fd,off,SEEK_SET)); printf("ReadStatus <%d>\n",read(fd,cDE,deSize)); printf("current Key/Data <%d/%s>\n",cDE->key,cDE->data); Furthermore, here's the dE struct in case you're wondering: struct dE { int key; char data[DataSize]; }; This prints: reading values at 1072 SeekStatus <1072> ReadStatus <32> current Key/Data <27/old> writing new values SeekStatus <1072> WriteStatus <32> re-reading values at 1072 SeekStatus <1072> ReadStatus <32> current Key/Data <27/old>

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  • Python: Parsing a colon delimited file with various counts of fields

    - by Mark
    I'm trying to parse a a few files with the following format in 'clientname'.txt hostname:comp1 time: Fri Jan 28 20:00:02 GMT 2011 ip:xxx.xxx.xx.xx fs:good:45 memory:bad:78 swap:good:34 Mail:good Each section is delimited by a : but where lines 0,2,6 have 2 fields... lines 1,3-5 have 3 or more fields. (A big issue I've had trouble with is the time: line, since 20:00:02 is really a time and not 3 separate fields. I have several files like this that I need to parse. There are many more lines in some of these files with multiple fields. ... for i in clients: if os.path.isfile(rpt_path + i + rpt_ext): # if the rpt exists then do this rpt = rpt_path + i + rpt_ext l_count = 0 for line in open(rpt, "r"): s_line = line.rstrip() part = s_line.split(':') print part l_count = l_count + 1 else: # else break break First I'm checking if the file exists first, if it does then open the file and parse it (eventually) As of now I'm just printing the output (print part) to make sure it's parsing right. Honestly, the only trouble I'm having at this point is the time: field. How can I treat that line specifically different than all the others? The time field is ALWAYS the 2nd line in all of my report files.

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  • Apache rewrite rules not causes a download dialog of the PHP file

    - by Shaihi
    I have Apache 2.2.17 using the WAMPServer 2.1 installation. I am debugging a website fully local on my computer. I have the following rule in the .htaccess: # Use PHP5 Single php.ini as default AddHandler application/x-httpd-php5s .php Options +FollowSymlinks RewriteEngine on Rewritebase / RewriteRule ^bella/(.*)/(.*)$ beauty.php?beauty_id=$1 [L] RewriteRule ^(argentina|brasil|chile|colombia|espana|mexico|rep_dominicana|uruguay|venezuela|peru|bolivia|cuba|ecuador|panama|paraguay|puerto_rico)/$ country.php?name=$1 [L] RewriteRule ^(argentina|brasil|chile|colombia|espana|mexico|rep_dominicana|uruguay|venezuela|peru|bolivia|cuba|ecuador|panama|paraguay|puerto_rico)/(hi5|facebook|twitter|orkut)/$ socialnetw.php?country=$1&category=$2 [L] The problem When I enable this rule and try to access http://localhost/index.php using FF I get a download dialog for the PHP file. If I comment the Rewrite* part in the .htaccess file then the index.php file loads fine, but navigation in the page is broken...

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  • Problems in "Save as PDF" plugin with Arabic numbers

    - by Mohamed Mohsen
    I use the "Save as PDF" plugin with Microsoft word 2007 to generate a PDF document from DOCX document. It works great except that the Arabic numbers in the word file have been converted to English numbers in the PDF document. Kindly find two links containing two screen shots explaining the problem. http://img27.imageshack.us/img27/2893/englishpdf.jpg http://img4.imageshack.us/img4/1857/arabicword.jpg The first image is the generated PDF file with the English numbers highlighted. The second image is the original word file with the Arabic numbers highlighted. Thanks in advance

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  • Cannot save iTunes library

    - by ongle
    Ever since I began using Windows 7 x64, I have been getting an infrequent error when using iTunes which goes something like this: The iTunes Library file cannot be saved. You do not have enough access privileges for this operation. Up until today this seemed to have no bad side effect but today I got the error, exited iTunes and started it back up only to discover my entire library was empty (the .xml file seemed to have been initialized). While I can restore my library from backup, this is pretty frustrating. Enough so that I may move the library to a MAC and sync there. I have reset the permissions on the folder. I have excluded the file from anti-virus scan. Neither of these things helped.

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  • Adobe Illustrator Saving to PSD: "Not enough memory to save the file"

    - by fiskfisk
    This is on CS5.5 under Windows XP Professional. There seems to be a known issue about saving (large) Adobe Illustrator files to PSD (thoroughly discussed), where the exporter will complain about "Not enough memory to save the file". This happens regardless of the available memory on the computer, and seems to be a limitation in the PSD exporter itself. The only possible solution so far seems to be to copy-n-paste each layer separately from the illustrator file and into the open Photoshop file. We need to keep the layers intact (and not merged), so selecting all the layers at the same time doesn't work. Do anyone have a workaround to the actual, original export issue, or a way to be able to get the layer information into Photoshop without handling each layer separately?

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  • Macro to copy values to new sheet and prompt user where they want to save

    - by MasterJedi
    I'm looking to create a macro in Excel 2007 which will do the following: copy the formatting and values from a sheet called 'report', insert this into a new workbook, naming the file with the value in 'B9' and appending the word 'report' to this when copying the data into a new workbook, the formatting of the original should be retained, but cell contents pasted as values rather than formulas prior to saving the file with the above name, the user will be prompted to choose their folder at the end, a message will be displayed alerting the user that the file has been saved successfully Any assistance would be much appreciated. Thanks. I have attempted to do this, but my experience with VBA is limited. Here is what I have done so far... Application.DisplayAlerts = False Worksheets("Report").Copy With ActiveSheet.UsedRange .Value = .Value End With ActiveSheet.DrawingObjects.Delete Set wbNew = ActiveWorkbook wbNew.SaveAs Application.GetSaveAsFilename wbNew.Close True Application.DisplayAlerts = True

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  • Where will the image be saved? [closed]

    - by Dummy Derp
    import java.awt.Dimension; import java.awt.Rectangle; import java.awt.Robot; import java.awt.Toolkit; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.io.File; ... public void captureScreen(String fileName) throws Exception { Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); Rectangle screenRectangle = new Rectangle(screenSize); Robot robot = new Robot(); BufferedImage image = robot.createScreenCapture(screenRectangle); ImageIO.write(image, "png", new File(fileName)); } ... Going over this code I found on the internet. I got everything except the part where file is created. In what format file name should be? Should it be C:/myFolder/myImage.png" or just myImage.png and where will it be saved? Here is what docs say: File public File(String pathname) Creates a new File instance by converting the given pathname string into an abstract pathname. If the given string is the empty string, then the result is the empty abstract pathname. Parameters: pathname - A pathname string Throws: NullPointerException - If the pathname argument is null

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  • VB.net Saving an MetaFile / EMF as a bitmap ( .tiff)

    - by pehaada
    Currently I have a third party control that generates a Metafile. I can save the .wmf file to disk with out issue. The problem is how do I render the Metafile as a Tiff file. Currently I have the following code to get my metafile and save it. Dim mf As Metafile = page.GetImage(TXTextControl.Page.PageContent.All) Dim enhMetafileHandle As IntPtr = mf.GetHenhmetafile() Dim h As IntPtr Dim bufferSize As UInteger = GetEnhMetaFileBits(enhMetafileHandle, 0, h) Dim buffer(CInt(bufferSize)) As Byte GetEnhMetaFileBits(enhMetafileHandle, bufferSize, buffer) Dim msMetafileStream As New MemoryStream msMetafileStream.Write(buffer, 0, CInt(bufferSize)) Dim baMetafileData() As Byte baMetafileData = msMetafileStream.ToArray Dim g As Graphics = Graphics.FromImage(mf) mf.Dispose() File.WriteAllBytes("c:\a.wmf", baMetafileData) end sub _ Public Shared Function GetEnhMetaFileBits( ByVal hEMF As System.IntPtr, ByVal nSize As UInteger, ByVal lpData As IntPtr) As UInteger End Function <System.Runtime.InteropServices.DllImportAttribute("gdi32.dll", EntryPoint:="GetEnhMetaFileBits")> _ Public Shared Function GetEnhMetaFileBits(<System.Runtime.InteropServices.InAttribute()> ByVal hEMF As System.IntPtr, ByVal nSize As UInteger, ByVal lpData() As Byte) As UInteger End Function I've tried all sort of IMAGE and Graphic calls and just can't save the meta file as a .tiff. Any suggestions would be great. I even tried to create a new bitmap and draw the metafile onto it. I always end up with a GDI exception being thrown.

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  • Change the content type of a pop up window.

    - by Oscar Reyes
    This question brought a new one: I have a html page and I need it to change the content type when the user press "save" button so the browser prompt to save the file to disk I've been doing this in the server side to offer "excel" versions of the page ( which is basically a html table ) <c:if test="${page.asExcelAction}"> <% response.setContentType("application/vnd.ms-excel"); %> What I'm trying to do now is to do the same, but in the client side with javacript but I can't manage to do it so. This is what I've got so far: <html> <head> <script> function saveAs(){ var sMarkup = document.getElementById('content').innerHTML; //var oNewDoc = document.open('application/vnd.ms-excel'); var oNewDoc = document.open('text/html'); oNewDoc.write( sMarkup ); oNewDoc.close(); } </script> </head> <body> <div id='content'> <table> <tr> <td>Stack</td> <td>Overflow</td> </tr> </table> </div> <input type="button" value="Save as" onClick="saveAs()"/> </body> </html>

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  • How To Update EF 4 Entity In ASP.NET MVC 3?

    - by Jason Evans
    Hi there. I have 2 projects - a class library containing an EDM Entity Framework model and a seperate ASP.NET MVC project. I'm having problems with how your suppose to edit and save changes to an entity using MVC. In my controller I have: public class UserController : Controller { public ActionResult Edit(int id) { var rep = new UserRepository(); var user = rep.GetById(id); return View(user); } [HttpPost] public ActionResult Edit(User user) { var rep = new UserRepository(); rep.Update(user); return View(user); } } My UserRepository has an Update method like this: public void Update(User user) { using (var context = new PDS_FMPEntities()) { context.Users.Attach(testUser); context.ObjectStateManager.ChangeObjectState(testUser, EntityState.Modified); context.SaveChanges(); } } Now, when I click 'Save' on the edit user page, the parameter user only contains two values populated: Id, and FirstName. I take it that is due to the fact that I'm only displaying those two properties in the view. My question is this, if I'm updating the user's firstname, and then want to save it, what am I suppose to do about the other User properties which were not shown on the view, since they now contain 0 or NULL values in the user object? I've been reading a lot about using stub entities, but I'm getting nowhere fast, in that none of the examples I've seen actually work. i.e. I keep getting EntityKey related exceptions. Can someone point me to a good tutorial/example of how to update EF 4 entities using a repository class, called by an MVC front-end? Cheers. Jas.

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  • object.valid? returns false but object.errors.full_messages is empty

    - by user549563
    Hello I'm confuse about objects that I can't save, simplified model is class Subscription < ActiveRecord::base belongs_to :user, :class_name => "User", :foreign_key => "user_id" has_many :transactions, :class_name => "SubscriptionTransaction" validates_presence_of :first_name, :message => "ne peut être vide" validates_presence_of :last_name, :message => "ne peut être vide" validates_presence_of :card_number, :message => "ne peut être vide" validates_presence_of :card_verification, :message => "ne peut être vide" validates_presence_of :card_type, :message => "ne peut être vide" validates_presence_of :card_expires_on, :message => "ne peut être vide" attr_accessor :card_number, :card_verification validate_on_create :validate_card def validate_card unless credit_card.valid? credit_card.errors.full_messages.each do |message| errors.add_to_base message end end end def credit_card @credit_card ||= ActiveMerchant::Billing::CreditCard.new( :type => card_type, :number => card_number, :verification_value => card_verification, :month => card_expires_on.month, :year => card_expires_on.year, :first_name => first_name, :last_name => last_name ) end end and in my subscription_controller if subscription.save # do something else debugger # means breakpoint where i try subscription.errors.full_messages # do something else end I tried to use ruby-debug for this adding a breakpoint before. And subscription.valid? return false which explains that ActiveRecord doesn't allow the save method. Unfortunately i can't know why the object is invalid. subscription.errors.full_messages # => [] I'm stucked, if you have any idea, thank you.

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  • Programmatically convert *.odt file to MS Word *.doc file using an OpenOffice.org basic macro

    - by Chen Levy
    I am trying to build a reStructuredText to MS Word document tool-chain, so I will be able to save only the rst sources in version control. So far I -- Have rst2odt.py to convert reStructuredText to OpenOffice.org Writer format. Next I want to use the most recent OpenOffice.org (currently 3.1) that do a pretty decent work of generating a Word 97/2000/XP document, so I wrote the macro: sub ConvertToWord(file as string) rem ---------------------------------------------------------------------- rem define variables dim document as object dim dispatcher as object rem ---------------------------------------------------------------------- rem get access to the document document = ThisComponent.CurrentController.Frame dispatcher = createUnoService("com.sun.star.frame.DispatchHelper") rem ---------------------------------------------------------------------- dim odf(1) as new com.sun.star.beans.PropertyValue odf(0).Name = "URL" odf(0).Value = "file://" + file + ".odt" odf(1).Name = "FilterName" odf(1).Value = "MS Word 97" dispatcher.executeDispatch(document, ".uno:Open", "", 0, odf()) rem ---------------------------------------------------------------------- dim doc(1) as new com.sun.star.beans.PropertyValue doc(0).Name = "URL" doc(0).Value = "file://" + file + ".doc" doc(1).Name = "FilterName" doc(1).Value = "MS Word 97" dispatcher.executeDispatch(document, ".uno:SaveAs", "", 0, doc()) end sub But when I executing it: soffice "macro:///Standard.Module1.ConvertToWord(/path/to/odt_file_wo_ext)" I get a: "BASIC runtime error. Property or method not found." message On the line: document = ThisComponent.CurrentController.Frame And when I comment that line, the above invocation complete without error, but do nothing. I guess I need to somehow set the value of document to a newly created instance, but I don't know how to do it. Or am I going at it at a completely backward way? P.S. I will consider JODConverter as a fallback, because I try to minimize my dependencies.

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  • allow file download to all types of files

    - by Avinash
    hi i have given my user to upload nay types of files. But my problem is that how can i force user top just download any type of files? Since pdf, jpg and text files are directly viewable to browser. So i want that any type of file should be downloaded to view. Running on php Thanks Avinash

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  • How to quickly determine whether a file is an image file using iPhone/iPad SDK

    - by Josh Bleecher Snyder
    If I have a (potentially largish) file on disk, and I want to determine quickly whether UIImage will be able to load it. I don't necessarily trust the file extension to be reliable; I need to look at the actual data. I can (of course) load it into a UIImage, but that's relatively slow and rather memory intensive. I'd rather just peek at the first chunk of the file and make a decision. What's the fastest, most efficient way to go about this that is still fairly reliable? (Ideally, it'd be an Apple-provided API, but I didn't turn one up in my searches.) A 99.9% solution is good enough; I'm willing to have false positives in rare cases, such as when an image file has been truncated.

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  • Save gcc compile status to a text file for Java

    - by JohnBore
    I'm making a C Assessment Program through Java, which has a bunch of programming questions for C, and it lets the user input an answer in the form of C code, and then press a "Compile" button, which is linked to a bat file that runs the user input code through gcc. I've got the input and compiling working, but I need to get the output from the compiler and get that to print textarea within the program. I can get a simple "Hello, world" compiling, but I'm having trouble getting programs that require a user input with scanf, for example, to be printed. else if(e.getSource().equals(compile)){ if(questionNumber<1){ JOptionPane.showMessageDialog(programFrame, "Please start the assessment", "Compile Error", JOptionPane.ERROR_MESSAGE); } else{ FileOutputStream fileWrite; try { fileWrite = new FileOutputStream("demo/demo.c"); new PrintStream(fileWrite).println(input.getText());//saves what the user has entered in to a C source file fileWrite.close(); @SuppressWarnings("unused") Process process = Runtime.getRuntime().exec("cmd /c compile.bat");//runs the batch file to compile the source file compileCode(); try{ fileStream = new FileInputStream("demo/output.txt"); inputStream = new DataInputStream(fileStream); bufferRead = new BufferedReader(new InputStreamReader(inputStream)); while((stringLine = bufferRead.readLine())!=null){ compiled.append(stringLine); compiled.append("\n"); } inputStream.close(); } catch(IOException exc){ System.err.println("Unable to read file"); System.exit(-1); } } catch (IOException exc) { JOptionPane.showMessageDialog(programFrame, "Demo file not found", "File Error", JOptionPane.ERROR_MESSAGE); } } This is the actionPerformed method for the "Compile" button, the compileCode() is the JFrame that displays the output and "compiled" is the textArea for the output. My batch file is: C: cd dev-cpp\bin gcc.exe H:\workspace\QuestionProgram\demo\demo.c -o demo > H:\workspace\QuestionProgram\demo\compilestatus.txt demo > H:\workspace\QuestionProgram\demo\output.txt I'm not sure how I can do it, so the frame is created for the output of the code if the code requires a user input as the command prompt doesn't open without adding "START" to .exec(), but then the frame appears before the program has finished running. Also, how would I get the output of the compiler if the compile fails because of an error? The way I've got it in my batch file at the moment doesn't put anything in a text file if it fails.

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  • Send MIME-encoded file as e-mail in C#

    - by Matthias
    Hi folks, I've got the problem that I have a MIME-encoded file with all relevant mail information (subject, from, to, ...) and want to send it over a defined SMTP server via C#. I've looked at the MailMessage class and searched for a solution, but I couldn't find something fitting. Are you able to help me? Thanks, Matthias

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  • Java FileInputStream ObjectInputStream reaches end of file EOF

    - by user69514
    I am trying to read the number of line in a binary file using readObject, but I get IOException EOF. Am I doing this the right way? FileInputStream istream = new FileInputStream(fileName); ObjectInputStream ois = new ObjectInputStream(istream); /** calculate number of items **/ int line_count = 0; while( (String)ois.readObject() != null){ line_count++; }

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  • I keep on getting "save operation failure" after any change on my XCode Data Model

    - by Philip Schoch
    I started using Core Data for iPhone development. I started out by creating a very simple entity (called Evaluation) with just one string property (called evaluationTopic). I had following code for inserting a fresh string: - (void)insertNewObject { // Create a new instance of the entity managed by the fetched results controller. NSManagedObjectContext *context = [fetchedResultsController managedObjectContext]; NSEntityDescription *entity = [[fetchedResultsController fetchRequest] entity]; NSManagedObject *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context]; // If appropriate, configure the new managed object. [newManagedObject setValue:@"My Repeating String" forKey:@"evaluationTopic"]; // Save the context. NSError *error; if (![context save:&error]) { // Handle the error... } [self.tableView reloadData]; } This worked perfectly fine and by pushing the +button a new "My Repeating String" would be added to the table view and be in persistent store. I then pressed "Design - Add Model Version" in XCode. I added three entities to the existing entity and also added new properties to the existing "Evaluation" entity. Then, I created new files off the entities by pressing "File - New File - Managed Object Classes" and created a new .h and .m file for my four entities, including the "Evaluation" entity with Evaluation.h and Evaluation.m. Now I changed the model version by setting "Design - Data Model - Set Current Version". After having done all this, I changed my insertMethod: - (void)insertNewObject { // Create a new instance of the entity managed by the fetched results controller. NSManagedObjectContext *context = [fetchedResultsController managedObjectContext]; NSEntityDescription *entity = [[fetchedResultsController fetchRequest] entity]; Evaluation *evaluation = (Evaluation *) [NSEntityDescription insertNewObjectForEntityForName:[entity name] inManagedObjectContext:context]; // If appropriate, configure the new managed object. [evaluation setValue:@"My even new string" forKey:@"evaluationSpeechTopic"]; // Save the context. NSError *error; if (![context save:&error]) { // Handle the error... } [self.tableView reloadData]; } This does not work though! Every time I want to add a row the simulator crashes and I get the following: "NSInternalInconsistencyException', reason: 'This NSPersistentStoreCoordinator has no persistent stores. It cannot perform a save operation.'" I had this error before I knew about creating new version after changing anything on the datamodel, but why is this still coming up? Do I need to do any mapping (even though I just added entities and properties that did not exist before?). In the Apple Dev tutorial it sounds very easy but I have been struggling with this for long time, never worked after changing model version.

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