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  • how to save nested form attributes to database

    - by siulamvictor
    I am not really understand how's the nested attributes work in Rails. I have 2 models, Accounts and Users. Accounts has_many Users. When a new user filled in the form, Rails reported User(#2164802740) expected, got Array(#2148376200) Is that Rails cannot read the nested attributes from the form? How can I fix it? How can I save the data from nested attributes form to database? Thanks all~ Here are the MVCs: Account Model class Account < ActiveRecord::Base has_many :users accepts_nested_attributes_for :users validates_presence_of :company_name, :message => "companyname is required." validates_presence_of :company_website, :message => "website is required." end User Model class User < ActiveRecord::Base belongs_to :account validates_presence_of :user_name, :message => "username too short." validates_presence_of :password, :message => "password too short." end Account Controller class AccountController < ApplicationController def new end def created end def create @account = Account.new(params[:account]) if @account.save redirect_to :action => "created" else flash[:notice] = "error!!!" render :action => "new" end end end Account/new View <h1>Account#new</h1> <% form_for :account, :url => { :action => "create" } do |f| %> <% f.fields_for :users do |ff| %> <p> <%= ff.label :user_name %><br /> <%= ff.text_field :user_name %> </p> <p> <%= ff.label :password %><br /> <%= ff.password_field :password %> </p> <% end %> <p> <%= f.label :company_name %><br /> <%= f.text_field :company_name %> </p> <p> <%= f.label :company_website %><br /> <%= f.text_field :company_website %> </p> <% end %> Account Migration class CreateAccounts < ActiveRecord::Migration def self.up create_table :accounts do |t| t.string :company_name t.string :company_website t.timestamps end end def self.down drop_table :accounts end end User Migration class CreateUsers < ActiveRecord::Migration def self.up create_table :users do |t| t.string :user_name t.string :password t.integer :account_id t.timestamps end end def self.down drop_table :users end end Thanks everyone. :)

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  • Declare in .h file? iPhone SDK

    - by Henry D'Andrea
    How would I declare this code in the header file (.h) in iPhone SDK? (void) save { UIGraphicsBeginImageContext(self.view.frame.size);  [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil); }

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  • Odd values/movement with UITouch and CGPoint.

    - by Joshua
    I'm getting odd numbers from UITouch and CGPoint and one is different, I also think this maybe causing a flickering affect in my app when I try to move something by following a touch. This is the code I'm using: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchDown"); UITouch *touch = [touches anyObject]; firstTouch = [touch locationInView:self.view]; if (CGRectContainsPoint(but.frame, firstTouch)) { butContains = YES; NSLog(@"butContains = %d", butContains); } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; currentTouch = [touch locationInView:self.view]; NSInteger x = currentTouch.x; NSInteger y = currentTouch.y; CGFloat CGX = (CGFloat)x; CGFloat CGY = (CGFloat)y; if (butContains == YES) { NSLog(@"touch in subView/contentView"); sub.frame = CGRectMake(CGX, CGY, 130.0, 21.0); } NSLog(@"touch moved"); } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; currentTouch = [touch locationInView:self.view]; NSLog(@"User tapped at %@", NSStringFromCGPoint(currentTouch)); NSLog(@"Point %a, %a", currentTouch.x, currentTouch.y); NSInteger x = currentTouch.x; NSInteger y = currentTouch.y; NSLog(@"Point %a, %a", y, x); CGFloat CGX = (CGFloat)x; CGFloat CGY = (CGFloat)y; NSLog(@"Point %g, %g", CGX, CGY); if (butContains == YES) { NSLog(@"touch in subView/contentView"); sub.frame = CGRectMake(CGX, CGY, 130.0, 21.0); } butContains = NO; NSLog(@"touch ended"); } - (IBAction)add:(id)sender{ InSightViewController *contentView = [[InSightViewController alloc] initWithNibName:@"SubView" bundle:[NSBundle mainBundle]]; [contentView loadView]; [self.view insertSubview:contentView.view atIndex:0]; } This is what I get from the touchesEnded method in the Debugger. 2010-04-20 20:06:13.045 InSight[25042:207] User tapped at {50, 78} 2010-04-20 20:06:13.047 InSight[25042:207] Point 0x1.9p+5, 0x1.38p+6 2010-04-20 20:06:13.048 InSight[25042:207] Point 0x1.900000027p-1037, 0x1.38p+6 2010-04-20 20:06:13.048 InSight[25042:207] Point 50, 78 And this is what's happening in the Simulator. fwdr.org/file:y8bd As this is a complicated problem this is the source code of my XCode Project aswell. http://cl.ly/Qjj

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  • Custom NSView in NSMenuItem not receiving mouse events

    - by Dennis
    I have an NSMenu popping out of an NSStatusItem using popUpStatusItemMenu. These NSMenuItems show a bunch of different links, and each one is connected with setAction: to the openLink: method of a target. This arrangement has been working fine for a long time. The user chooses a link from the menu and the openLink: method then deals with it. Unfortunately, I recently decided to experiment with using NSMenuItem's setView: method to provide a nicer/slicker interface. Basically, I just stopped setting the title, created the NSMenuItem, and then used setView: to display a custom view. This works perfectly, the menu items look great and my custom view is displayed. However, when the user chooses a menu item and releases the mouse, the action no longer works (i.e., openLink: isn't called). If I just simply comment out the setView: call, then the actions work again (of course, the menu items are blank, but the action is executed properly). My first question, then, is why setting a view breaks the NSMenuItem's action. No problem, I thought, I'll fix it by detecting the mouseUp event in my custom view and calling my action method from there. I added this method to my custom view: - (void)mouseUp:(NSEvent *)theEvent { NSLog(@"in mouseUp"); } No dice! This method is never called. I can set tracking rects and receive mouseEntered: events, though. I put a few tests in my mouseEntered routine, as follows: if ([[self window] ignoresMouseEvents]) { NSLog(@"ignoring mouse events"); } else { NSLog(@"not ignoring mouse events"); } if ([[self window] canBecomeKeyWindow]) { dNSLog((@"canBecomeKeyWindow")); } else { NSLog(@"not canBecomeKeyWindow"); } if ([[self window] isKeyWindow]) { dNSLog((@"isKeyWindow")); } else { NSLog(@"not isKeyWindow"); } And got the following responses: not ignoring mouse events canBecomeKeyWindow not isKeyWindow Is this the problem? "not isKeyWindow"? Presumably this isn't good because Apple's docs say "If the user clicks a view that isn’t in the key window, by default the window is brought forward and made key, but the mouse event is not dispatched." But there must be a way do detect these events. HOW? Adding: [[self window] makeKeyWindow]; has no effect, despite the fact that canBecomeKeyWindow is YES.

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  • Declaring object type as NSManagedObject or class name

    - by Don Fulano
    In Core Data, if I have a Person entity is there any difference between: NSManagedObject *aPerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:[self managedObjectContext]]; or Person *aPerson = [NSEntityDescription insertNewObjectForEntityForName:@"Person" inManagedObjectContext:[self managedObjectContext]]; Should aPerson be of type Person or NSManagedObject? Is there a difference?

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  • problem with showing modalviewcontroller in landscape mode in iphone?

    - by abhiTouchmagic
    hey hello... my application consist of a landscape view where i want to put a modalview but the problem is with modalview. it doesn't get load on presenting it.. code is: --------------------code here---------------------- UIViewController *modalViewController = [[UIViewController alloc] init]; modalViewController.view = modelView1; [self presentModalViewController:modalViewController animated:NO]; [self performSelector:@selector(hideSplash) withObject:nil afterDelay:5.0]; plz kindly help me with this....

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  • Defining a Class in Objective C, XCode

    - by Brett
    Hello; I am new to Objective C, and am trying to write a class that defines a complex number. The code seems fine but when I print to the console, my values for instance variables are 0. Here is the code: // // ComplexNumber.h // Mandelbrot Set // // Created by Brett on 10-06-02. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import <Foundation/Foundation.h> #import <stdio.h> @interface ComplexNumber : NSObject { double real; double imaginary; } // Getters -(double) real; -(double) imaginary; // Setters -(void)setReal: (double) a andImaginary: (double) b; //Function -(ComplexNumber *)squared; @end // // ComplexNumber.m // Mandelbrot Set // // Created by Brett on 10-06-02. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import "ComplexNumber.h" #import <math.h> #import <stdio.h> @implementation ComplexNumber -(double)real{ return self->real; } -(double)imaginary{ return self->imaginary; } -(void)setReal: (double) a andImaginary: (double) b{ self->real=a; self->imaginary=b; } -(ComplexNumber *)squared{ double a = pow(real,2); double b = pow(imaginary, 2); double c = 2*real*imaginary; ComplexNumber *d; [d setReal:(a-b) andImaginary: c]; return d; } @end In the App Delegate for debugging purposes I added: - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { ComplexNumber *testNumber = [[ComplexNumber alloc] init]; [testNumber setReal:55.0 andImaginary:30.0]; NSLog(@"%d", testNumber.real); // Override point for customization after app launch [window addSubview:viewController.view]; [window makeKeyAndVisible]; return YES; } But the console returns 0 everytime. Help?

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  • Multiple View App shows Blank Screen in Simulator

    - by Brett Coburn
    Hello; I am developing a simple app that first shows a menu screen, and when a button is pressed, a game screen appears. I was able to develop the game screen without any issues, but when I changed the code to first display the menu, the simulator showed a blank screen. I've read all the articles on connecting views with IB but I can't figure this out. Any help would be appreciated. This is my code: // Pong_Multiple_ViewAppDelegate.h // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright __MyCompanyName__ 2010. All rights reserved. // #import <UIKit/UIKit.h> @class MenuViewController; @interface Pong_Multiple_ViewAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; MenuViewController *navigationController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet MenuViewController *navigationController; @end // // Pong_Multiple_ViewAppDelegate.m // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright __MyCompanyName__ 2010. All rights reserved. // #import "Pong_Multiple_ViewAppDelegate.h" #import "MenuViewController.h" @implementation Pong_Multiple_ViewAppDelegate @synthesize window; @synthesize navigationController; - (void)application:(UIApplication *)application{ // Override point for customization after application launch [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } - (void)dealloc { [navigationController release]; [window release]; [super dealloc]; } @end // // MenuViewController.h // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import <UIKit/UIKit.h> #import "GameViewController.h" @interface MenuViewController : UIViewController { GameViewController *gameViewController; IBOutlet UIButton *gameButton; } @property(nonatomic, retain) GameViewController *gameViewController; @property(nonatomic, retain) UIButton *gameButton; -(IBAction)switchPage:(id)sender; @end // // MenuViewController.m // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import "MenuViewController.h" #import "GameViewController.h" @implementation MenuViewController @synthesize gameViewController; @synthesize gameButton; -(IBAction)switchPage:(id)sender{ if (self.gameViewController==nil) { GameViewController *gameView = [[GameViewController alloc]initWithNibName:@"GameView" bundle:[NSBundle mainBundle]]; self.gameViewController= gameView; [gameView release]; } [self.navigationController pushViewController:self.gameViewController animated:YES]; } .... @end My code also includes classes: GameViewController.h, GameViewController.m, and nib files: MenuView.xib, and GameView.xib Thanks, B

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  • Go back to main window once secondView is loaded

    - by Ruthy
    Hi, I have a Tableview on AppDelegate That calls a SecondView (dvController) when DidSelectRowAtIndexPath using: [self.window addSubview:[dvController view]]; On SecondView I defined a button linked to IBAction that should go back to previous view. It works great but when row selected but, How could then go back to previous view if main one is AppDelegate? self.window addSubview:[?? view]]; Should be basic concept but I am quite new and unable to get the solution. Thanx :)

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  • Unit Testing a Django Form with a FileField

    - by Jason Christa
    I have a form like: #forms.py from django import forms class MyForm(forms.Form): title = forms.CharField() file = forms.FileField() #tests.py from django.test import TestCase from forms import MyForm class FormTestCase(TestCase) def test_form(self): upload_file = open('path/to/file', 'r') post_dict = {'title': 'Test Title'} file_dict = {} #?????? form = MyForm(post_dict, file_dict) self.assertTrue(form.is_valid()) How do I construct the *file_dict* to pass *upload_file* to the form?

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  • Pop Over Control on iPad Problem !

    - by Momeks
    Hi , i try to load a view via UIPopover but my app crash after tap the popover button , i tried to solve it but i don't understand ! here is my code : - (IBAction)calendarPopUp:(id)sender { PopViewController *cal = [[PopViewController alloc]init]; //The compiler tells me the problem comes from this line : UIPopoverController *popOver = [[UIPopoverController alloc] initWithContentViewController:cal]; [popOver setDelegate:self]; [popOver presentPopoverFromRect:CGRectMake(113, 64, 226, 129) inView:self permittedArrowDirections:UIPopoverArrowDirectionDown animated:YES]; [popOver setPopoverContentSize:CGSizeMake(226, 129)]; }

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  • How to tile the contents of a CALayer?

    - by iaefai
    I would like to tile a CGImage across a CALayer, but it seems to only want to stretch it. The example code: self.background = [UIImage imageNamed: @"Background.png"]; [documentDisplay.layer setContents: self.background.CGImage]; I would like to avoid subclassing if I could.

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  • class composition instead of object composition?

    - by fayer
    I want a class property to be reference to another class, not its object and then use this property to call the class's static methods. class Database { private static $log; public static function addLog($LogClass) { self::$log = $LogClass; } public static function log() { self::$log::write(); // seems not possible to write it like this } } any suggestions how i can accomplish this? cause i have no reason making them objects, i want to use the classes for it.

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  • Django: customizing the message after a successful form save

    - by chiurox
    Hello, whenever I save a model in my Admin interface, it displays the usual "successfully saved message." However, I want to know if it's possible to customize this message because I have a situation where I want to warn the user about what he just saved and the implications of these actions. class PlanInlineFormset(forms.models.BaseInlineFormset): def clean(self): ### How can I detect the changes? ### (self.changed_data doesn't work because it's an inline) ### and display what he/she just changed at the top AFTER the successful save? class PlanInline(admin.TabularInline): model = Plan formset = PlanInlineFormset

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  • question regarding rails framework code

    - by Joseph Misiti
    I noticed that the code in the rails framework is using the following convention all over the place: class SomeClass class << self def some function end end end rather than class SomeClass end def SomeClass.function end and class SomeClass def self.somefunction end end What is the reason for this design choice? They all seem to accomplish them same thing

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  • tmpfile and gzip combination problem

    - by Vojtech R.
    I have problem with this code: file = tempfile.TemporaryFile(mode='wrb') file.write(base64.b64decode(data)) file.flush() os.fsync(file) # file.seek(0) f = gzip.GzipFile(mode='rb', fileobj=file) print f.read() I dont know why it doesn't print out anything. If I uncomment file.seek then error occurs: File "/usr/lib/python2.5/gzip.py", line 263, in _read self._read_gzip_header() File "/usr/lib/python2.5/gzip.py", line 162, in _read_gzip_header magic = self.fileobj.read(2) IOError: [Errno 9] Bad file descriptor Just for information this version works fine: x = open("test.gzip", 'wb') x.write(base64.b64decode(data)) x.close() f = gzip.GzipFile('test.gzip', 'rb') print f.read()

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  • Datamapper, defining your own object methods, how?

    - by Dublinclontarf
    So lets say I have a class like below class List include DataMapper::Resource property :id, Serial property :username, String def self.my_username return self[:username] end end list=List.create(:username=>,'jim') list.my_username When I run this it tells me that the method cannot be found, and on more investigation that you can only define class methods(not object methods) and that class methods don't have access to objects data. Is there any way to have these methods included as object methods and get access to object data? I'm using Ruby 1.8.6 and the latest version of datamapper.

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  • Django-ckeditor inline error

    - by ad3w
    I'm using FeinCMS (https://github.com/feincms/feincms/) and django-ckeditor with file upload support (https://github.com/shaunsephton/django-ckeditor). I create a FeinCMS content type for RichTextField: class RichContent(models.Model): text = RichTextField(_('text')) class Meta: abstract = True verbose_name = _('Rich Text') verbose_name_plural =_('Rich Text') def render(self, **kwargs): context_instance = kwargs.get('context_instance') return render_to_string('content/page/rich_content.html', { 'page': self, }, context_instance=context_instance) But in Django admin, when i select 'Rich Text' and press 'Go', get this error in firebug console: uncaught exception: [CKEDITOR.editor] The instance "id_richcontent_set-__prefix__-text" already exists. And textarea in ckeditor do not editable.

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  • Unbalanced calls to begin/end appearance transitions for <ViewController>,<Tab>

    - by onkar
    I am trying to implement Tabs into my secondView.On button touch(from ViewController.m) I am navigating to secondView(Tabs). In my Tabs.xib file I have added a TabBar at bottom and it is custom class of UITabBar. ViewController.m - (IBAction)touchedInside:(id)sender { NSLog(@"touhced up inside"); Tabs *temp = [[Tabs alloc]initWithNibName:@"Tabs" bundle:nil]; [self.navigationController pushViewController:temp animated:YES]; [self presentViewController:temp animated:YES completion:nil]; } Tabs.m - (void)viewDidLoad { [super viewDidLoad]; AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; UITabBarController *tabBarController = [[UITabBarController alloc]init]; /* Tab_1 *firstView = [[Tab_1 alloc] init]; UITabBarItem *item1 = [[UITabBarItem alloc]initWithTitle:@"First" image:nil tag:1]; [firstView setTabBarItem:item1]; NSLog(@"after first tab is added"); Tab_2 *secondView = [[Tab_2 alloc] init]; UITabBarItem *item2 = [[UITabBarItem alloc]initWithTitle:@"Sec" image:nil tag:1] ; [secondView setTabBarItem:item2]; NSLog(@"after second tab is added"); [tabBarController setViewControllers:[NSArray arrayWithObjects:firstView,secondView,nil] animated:NO]; NSLog(@"after tab is added"); [appDelegate.window addSubview:tabBarController.view]; NSLog(@"after view is added"); */ appDelegate.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. UIViewController *viewController1 = [[Tab_1 alloc] initWithNibName:@"Tab 1" bundle:nil]; UIViewController *viewController2 = [[Tab_2 alloc] initWithNibName:@"Tab 2" bundle:nil]; UIViewController *viewController3 = [[Tab_2 alloc] initWithNibName:@"Tab 1" bundle:nil]; tabBarController.viewControllers = [NSArray arrayWithObjects:viewController1, viewController2, viewController3, nil]; appDelegate.window.rootViewController = self.tabBarController; [appDelegate.window makeKeyAndVisible]; Tabs *temp = [[Tabs alloc]initWithNibName:@"Tabs" bundle:nil]; [self.navigationController presentModalViewController:temp animated:NO]; } Errors Unbalanced calls to begin/end appearance transitions for <ViewController: 0x6833c80>. 2012-12-06 09:57:48.963 demoTabs[667:f803] Unbalanced calls to begin/end appearance transitions for <Tabs: 0x6a3fc90>.

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  • Python mistaking float for string

    - by wrongusername
    I receive TypeError: Can't convert 'float' object to str implicitly while using Gambler.pot += round(self.bet + self.money * 0.1) where pot, bet, and money are all doubles (or at least are supposed to be). I'm not sure if this is yet another Eclipse thing, but how do I get the line to compile? Code where bet and money are initialized: money = 0 bet = 0

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  • indentationLevelForRowAtIndexPath not indenting custom cell

    - by Xetius
    I have overridden the tableView:indentationLevelForRowAtIndexPath method in my UITableViewController derived class as follows: - (NSInteger)tableView:(UITableView *)tableView indentationLevelForRowAtIndexPath:(NSIndexPath *)indexPath { NSDictionary* item = [self.projects objectAtIndex:indexPath.row]; int indentationLevel = [[item objectForKey:@"indent"] intValue]; DLog (@"Indentation Level for Row %d : %d", indexPath.row, indentationLevel); return indentationLevel; } I initially thought that this was not being called but that was operator error (err, mine) and I hadn't defined the symbol DEBUG=1. However, it is being called (duh me!) and this is the log output: -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 0 : 1 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 1 : 1 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 2 : 2 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 3 : 2 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 4 : 2 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 5 : 1 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 6 : 2 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 7 : 2 -[RootViewController tableView:indentationLevelForRowAtIndexPath:] [Line 129] Indentation Level for Row 8 : 1 But, this is not affecting the layout of the cells. No indentation. This is my itemCellForRowAtIndexPath implementation, if that makes any difference: -(UITableViewCell*)tableView:(UITableView *)tableView itemCellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString* cellIdentifier = @"projectItemCell"; ProjectItemTableViewCell* cell = (ProjectItemTableViewCell*)[tableView dequeueReusableCellWithIdentifier:cellIdentifier]; if (cell == nil) { NSArray* nib = [[NSBundle mainBundle] loadNibNamed:@"ProjectItemTableViewCell" owner:self options:nil]; for (id oneObject in nib) { if ([oneObject isKindOfClass:[ProjectItemTableViewCell class]]) { cell = (ProjectItemTableViewCell*)oneObject; } } } NSDictionary* item = [self.projects objectAtIndex:indexPath.row]; cell.projectDescLabel.text = [item objectForKey:@"name"]; cell.itemCountlabel.text = [NSString stringWithFormat:@"%d", [[item objectForKey:@"cache_count"] intValue]]; cell.itemCountlabel.backgroundColor = [UIColor colorForHex:[item objectForKey:@"color"]]; cell.indentationWidth = 20; return cell; } How do I indent a custom UITableViewCell which I have defined in Interface Builder? If I change the itemCellForRowAtIndexPath to use a default UITableViewCell with the code below, then it indents fine. static NSString* cellIdentifier = @"projectItemCell"; UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease]; } NSDictionary* item = [self.projects objectAtIndex:indexPath.row]; cell.textLabel.text = [item objectForKey:@"name"]; cell.indentationWidth = 40; return cell;

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  • Putting update logic in your migrations

    - by Daniel Abrahamsson
    A couple of times I've been in the situation where I've wanted to refactor the design of some model and have ended up putting update logic in migrations. However, as far as I've understood, this is not good practice (especially since you are encouraged to use your schema file for deployment, and not your migrations). How do you deal with these kind of problems? To clearify what I mean, say I have a User model. Since I thought there would only be two kinds of users, namely a "normal" user and an administrator, I chose to use a simple boolean field telling whether the user was an adminstrator or not. However, after I while I figured I needed some third kind of user, perhaps a moderator or something similar. In this case I add a UserType model (and the corresponding migration), and a second migration for removing the "admin" flag from the user table. And here comes the problem. In the "add_user_type_to_users" migration I have to map the admin flag value to a user type. Additionally, in order to do this, the user types have to exist, meaning I can not use the seeds file, but rather create the user types in the migration (also considered bad practice). Here comes some fictional code representing the situation: class CreateUserTypes < ActiveRecord::Migration def self.up create_table :user_types do |t| t.string :name, :nil => false, :unique => true end #Create basic types (can not put in seed, because of future migration dependency) UserType.create!(:name => "BASIC") UserType.create!(:name => "MODERATOR") UserType.create!(:name => "ADMINISTRATOR") end def self.down drop_table :user_types end end class AddTypeIdToUsers < ActiveRecord::Migration def self.up add_column :users, :type_id, :integer #Determine type via the admin flag basic = UserType.find_by_name("BASIC") admin = UserType.find_by_name("ADMINISTRATOR") User.all.each {|u| u.update_attribute(:type_id, (u.admin?) ? admin.id : basic.id)} #Remove the admin flag remove_column :users, :admin #Add foreign key execute "alter table users add constraint fk_user_type_id foreign key (type_id) references user_types (id)" end def self.down #Re-add the admin flag add_column :users, :admin, :boolean, :default => false #Reset the admin flag (this is the problematic update code) admin = UserType.find_by_name("ADMINISTRATOR") execute "update users set admin=true where type_id=#{admin.id}" #Remove foreign key constraint execute "alter table users drop foreign key fk_user_type_id" #Drop the type_id column remove_column :users, :type_id end end As you can see there are two problematic parts. First the row creation part in the first model, which is necessary if I would like to run all migrations in a row, then the "update" part in the second migration that maps the "admin" column to the "type_id" column. Any advice?

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  • Flipping PDF pages in QuartzDemo application

    - by BittenApple
    I am working on modifying the quartzdemo application so that it can show another page from a multipage pdf on tap screen event. So far I have stripped it down to the point where it displays the PDF on any page as initial page, but I can't seem to get it figured out how to make the quartzview display anything else then the initial page. I'm guessing that the pushViewController has something to do with this. Anyway, here's my method that draws the initial page and in sits in QuartzImages.m file: -(void)drawNewPage:(CGContextRef)myContext { CGContextTranslateCTM(myContext, 0.0, self.bounds.size.height); CGContextScaleCTM(myContext, 1.0, -1.0); CGContextSetRGBFillColor(myContext, 255, 255, 255, 1); CGContextFillRect(myContext, CGRectMake(0, 0, 320, 412)); CGPDFPageRef page = CGPDFDocumentGetPage(pdfFajl, pageNumber); CGContextSaveGState(myContext); CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, self.bounds, 0, true); CGContextConcatCTM(myContext, pdfTransform); CGContextDrawPDFPage(myContext, page); CGContextRestoreGState(myContext); } This gets fired up in MainViewController.m so: - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // ### DISPLAY DESIRED PAGE QuartzViewController *targetViewController = [self controllerAtIndexPath:indexPath]; if ([targetViewController.quartzView isKindOfClass:[QuartzPDFView1 class]]) { ((QuartzPDFView1 *)targetViewController.quartzView).pageNumber = 1; CFURLRef pdfURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), CFSTR("mypdftest.pdf"), NULL, NULL); ((QuartzPDFView1 *)targetViewController.quartzView).pdfFajl = CGPDFDocumentCreateWithURL((CFURLRef)pdfURL); CFRelease(pdfURL); } [[self navigationController] pushViewController:targetViewController animated:YES]; } Since I'm fairly new to the iPhone development (I'm currently only on page 123 in "beginning iphone 3 development" book) these controllers confuse me as hell. I have setup an event which gets fired up fine on screen tap. The event sits in QuartzView.m and I get a simple alert on screen tap showing that the tap was registered. I would like to use this method to draw a new page instead of showing the alert, page number doesn't matter, I'll work on incrementing (page flipping) later, I need an example of how to call these methods (if its even possible). These are defined in QuartzView.h and I planned on using them in the tap event method: CGPDFDocumentRef pdfFajl; int pageNumber; Thankful for any useful input from "the internets" :)

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