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• complex MySQL Order by not working

  - by Les Reynolds

  Here is the select statement I'm using. The problem happens with the sorting. When it is like below, it only sorts by t2.userdb_user_first_name, doesn't matter if I put that first or second. When I remove that, it sorts just fine by the displayorder field value pair. So I know that part is working, but somehow the combination of the two causes the first_name to override it. What I want is for the records to be sorted by displayorder first, and then first_name within that. SELECT t1.userdb_id FROM default_en_userdbelements as t1 INNER JOIN default_en_userdb AS t2 ON t1.userdb_id = t2.userdb_id WHERE t1.userdbelements_field_name = 'newproject' AND t1.userdbelements_field_value = 'no' AND t2.userdb_user_first_name!='Default' ORDER BY (t1.userdbelements_field_name = 'displayorder' AND t1.userdbelements_field_value), t2.userdb_user_first_name; Edit: here is what I want to accomplish. I want to list the users (that are not new projects) from the userdb table, along with the details about the users that is stored in userdbelements. And I want that to be sorted first by userdbelements.displayorder, then by userdb.first_name. I hope that makes sense? Thanks for the really quick help! Edit: Sorry for disappearing, here is some sample data userdbelements userdbelements_id userdbelements_field_name userdbelements_field_value userdb_id 647 heat 1 648 displayorder 1 - Sponsored 1 645 condofees 1 userdb userdb_id userdb_user_name userdb_emailaddress userdb_user_first_name userdb_user_last_name 10 harbourlights [email protected] Harbourlights 1237 Northshore Blvd, Burlington 11 harbourview [email protected] Harbourview 415 Locust Street, Burlington 12 thebalmoral [email protected] The Balmoral 2075 & 2085 Amherst Heights Drive, Burlington

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• Getting error while connecting to facebook

  - by Bakhtiyor

  I have downloaded php-sdk for using facebook in php. I also created facebook application in the facebook web page in order to get API key and secret key. When I run example.php and try to connect to facebook it shows me the following error: Configuration errors: To fix this error, please set your Connect URL in the application settings editor. Once it has been set, users will be redirected to that URL instead of this page after logging in. I am using this php-sdk in the localhost. I tried to assign localhost as Connect URL but facebook doesn't accept it. I have read about Cross Domain Communication Channel and think this is what I need. But I don't know how to use it. Anyone can help me to solve this problem please? Update Actually what I need is following. I have Web Application and need to connect to facebook and search for users in facebook who has specific(user will specify this) Likes and Interests. Any idea about solving my problem?

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• How to check for mutual existence of Fields in same table in Two columns

  - by ranabra

  I tried using "Exist" and "IN". Not only did I not succeed, it didn't seem as an efficient solution. Here is a simplified example: TblMyTable WorkerUserName  -  WorkerDegree  -  ManagerUserName  -  ManagerDegree I need a query where there is a mutual connection / existence. What I mean is only where the worker, ex. "John" has a manager named "Mary", and where Mary the manager has a worker named "John". John the worker can have several managers and Mary the manager can have several workers. So the result will be (the order doesn't matter) ideally in one line: John - BSc  --  Mary - M.A. or Mary - M.A.  --  John - BSc The punchline is it's only one table. it is not really managers and workers, this is just a simplification of the situation. In the real situation both are equal, in a Table of names of users working with other users. Database is SQL 2005. Many thanx in advance  

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• Heroku Push Problem part 2 - Postgresql - PGError Relations does not exist - Ruby on Rails

  - by bgadoci

  Ok so got through my last problem with the difference between Postgresql and SQLite and seems like Heroku is telling me I have another one. I am new to ruby and rails so a lot of this stuff I can't decipher at first. Looking for a little direction here. The error message and PostsController Index are below. I checked my routes.rb file and all seems well there but I could be missing something. I will post if you need. Processing PostsController#index (for 99.7.50.140 at 2010-04-23 15:19:22) [GET] ActiveRecord::StatementInvalid (PGError: ERROR: relation "tags" does not exist : SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum WHERE a.attrelid = '"tags"'::regclass AND a.attnum > 0 AND NOT a.attisdropped ORDER BY a.attnum ): PostsController#index def index @tag_counts = Tag.count(:group => :tag_name, :order => 'count_all DESC', :limit => 20) conditions, joins = {}, :votes @ugtag_counts = Ugtag.count(:group => :ugctag_name, :order => 'count_all DESC', :limit => 20) conditions, joins = {}, :votes @vote_counts = Vote.count(:group => :post_title, :order => 'count_all DESC', :limit => 20) conditions, joins = {}, :votes unless(params[:tag_name] || "").empty? conditions = ["tags.tag_name = ? ", params[:tag_name]] joins = [:tags, :votes] end @posts=Post.paginate( :select => "posts.*, count(*) as vote_total", :joins => joins, :conditions=> conditions, :group => "votes.post_id, posts.id ", :order => "created_at DESC", :page => params[:page], :per_page => 5) @popular_posts=Post.paginate( :select => "posts.*, count(*) as vote_total", :joins => joins, :conditions=> conditions, :group => "votes.post_id, posts.id", :order => "vote_total DESC", :page => params[:page], :per_page => 3) respond_to do |format| format.html # index.html.erb format.xml { render :xml => @posts } format.json { render :json => @posts } format.atom end end

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• Rspec-rails doesn't seem to find my models

  - by sa125

  Hi - I'm trying out rspec, and immediately hit a wall when it doesn't seem to load db records I know exist. Here's my fairly simple spec (no tests yet). require File.expand_path(File.dirname(__FILE__) + '../spec_helper') describe SomeModel do before :each do @user1 = User.find(1) @user2 = User.find(2) end it "should do something fancy" end I get an ActiveRecord::RecordNotFound exception, saying it couldn't find User w/ ID=1 or ID=2, which I know for a fact exist. I set both test and development databases to point to the same schema in database.yml, so this shouldn't be database mixup. I also ran script/generate rspec after installing the gems (rspec, rspec-rails), and gem.config both environment.rb and test.rb. Any idea what I'm missing? thanks. EDIT Seems I was running the tests with rake spec:models, which emptied the db and thus no records were found. When I used % spec spec/models/some_model_spec.rb, everything worked as expected.

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• Rails timezone differences between Time and DateTime

  - by kjs3

  I have the timezone set. config.time_zone = 'Mountain Time (US & Canada)' Creating a Christmas event from the console... c = Event.new(:title = "Christmas") using Time: c.start = Time.new(2012,12,25) = 2012-12-25 00:00:00 -0700 #has correct offset c.end = Time.new(2012,12,25).end_of_day = 2012-12-25 23:59:59 -0700 #same deal using DateTime: c.start = DateTime.new(2012,12,25) = Tue, 25 Dec 2012 00:00:00 +0000 # no offset c.end = DateTime.new(2012,12,25).end_of_day = Tue, 25 Dec 2012 23:59:59 +0000 # same I've carelessly been using DateTime thinking that input was assumed to be in the config.time_zone but there's no conversion when this gets saved to the db. It's stored just the same as the return values (formatted for the db). Using Time is really no big deal but do I need to manually offset anytime I'm using DateTime and want it to be in the correct zone?

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• Why can't I set boolean columns with update?

  - by Benjamin Oakes

  I'm making a user administration page. For the system I'm creating, users need to be approved. Sometimes, there will be many users to approve, so I'd like to make that easy. I'm storing this as a boolean column called approved. I remembered the Edit Multiple Individually Railscast and thought it would be a great fit. However, I'm running into problems which I traced back to ActiveRecord::Base#update. update works fine in this example: >> User.all.map(&:username) => ["ben", "fred"] >> h = {"1"=>{'username'=>'benjamin'}, "2"=>{"username"=>'frederick'}} => {"1"=>{"username"=>"benjamin"}, "2"=>{"username"=>"frederick"}} >> User.update(h.keys, h.values) => ... >> User.all.map(&:username) => ["benjamin", "frederick"] But not this one: >> User.all.map(&:approved) => [true, nil] >> h = {"1"=>{'approved'=>'1'}, "2"=>{'approved'=>'1'}} >> User.update(h.keys, h.values) => ... >> User.all.map(&:approved) => [true, nil] Chaging from '1' to true didn't make a difference when I tested. What am I doing wrong?

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• What is common case for @dynamic usage ?

  - by Forrest

  There is previous post about difference of @synthesize and @dynamic. I wanna to know more about dynamic from the perspective of how to use @dynamic usually. Usually we use @dynamic together with NSManagedObject // Movie.h @interface Movie : NSManagedObject { } @property (retain) NSString* title; @end // Movie.m @implementation Movie @dynamic title; @end Actually there are no generated getter/setter during compiler time according to understanding of @dynamic, so it is necessary to implement your own getter/setter. My question is that in this NSManagedObject case, what is the rough implementation of getter/setter in super class NSManagedObject ? Except above case, how many other cases to use @dynamic ? Thanks,

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• Non Working Relationship

  - by Dominik K.

  Hello everyone, I got a problem with cake's model architecture. I got a Users-Model and a Metas-Model. Here are the model codes: Users: <?php class User extends AppModel { var $name = 'User'; var $validate = array( 'username' => array('notempty'), 'email' => array('email'), 'password' => array('notempty') ); var $displayField = 'username'; var $hasMany = array( 'Meta' => array( 'className' => 'Meta', 'foreignKey' => 'user_id' ) ); } ?> and the Metas Model: <?php class Meta extends AppModel { var $name = 'Meta'; //The Associations below have been created with all possible keys, those that are not needed can be removed var $belongsTo = array( 'User' => array( 'className' => 'User', 'foreignKey' => 'user_id', 'required' => true ) ); } ?> So now the question is why do I not get the Meta data into the User array? Should I get it in the Auth object? Or where can I work with the meta data? hope you can help me! Have a nice Day! Dom

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• Problems with :uniq => true/Distinct option in a has_many_through association w/ named scope (Rails)

  - by MikeH

  I had to make some tweaks to my app to add new functionality, and my changes seem to have broken the :uniq option that was previously working perfectly. Here's the set up: #User.rb has_many :products, :through = :seasons, :uniq = true has_many :varieties, :through = :seasons, :uniq = true #product.rb has_many :seasons has_many :users, :through = :seasons, :uniq = true has_many :varieties #season.rb belongs_to :product belongs_to :variety belongs_to :user named_scope :by_product_name, :joins = :product, :order = 'products.name' #variety.rb belongs_to :product has_many :seasons has_many :users, :through = :seasons, :uniq = true First I want to show you the previous version of the view that is now breaking, so that we have a baseline to compare. The view below is pulling up products and varieties that belong to the user. In both versions below, I've assigned the same products/varieties to the user so the logs will looking at the exact same use case. #user/show <% @user.products.each do |product| %> <%= link_to product.name, product %> <% @user.varieties.find_all_by_product_id(product.id).each do |variety| %> <%=h variety.name.capitalize %></p> <% end %> <% end %> This works. It displays only one of each product, and then displays each product's varieties. In the log below, product ID 1 has 3 associated varieties. And product ID 43 has none. Here's the log output for the code above: Product Load (11.3ms) SELECT DISTINCT `products`.* FROM `products` INNER JOIN `seasons` ON `products`.id = `seasons`.product_id WHERE ((`seasons`.user_id = 1)) ORDER BY name, products.name Product Columns (1.8ms) SHOW FIELDS FROM `products` Variety Columns (1.9ms) SHOW FIELDS FROM `varieties` Variety Load (0.7ms) SELECT DISTINCT `varieties`.* FROM `varieties` INNER JOIN `seasons` ON `varieties`.id = `seasons`.variety_id WHERE (`varieties`.`product_id` = 1) AND ((`seasons`.user_id = 1)) ORDER BY name Variety Load (0.5ms) SELECT DISTINCT `varieties`.* FROM `varieties` INNER JOIN `seasons` ON `varieties`.id = `seasons`.variety_id WHERE (`varieties`.`product_id` = 43) AND ((`seasons`.user_id = 1)) ORDER BY name Ok, so everything above is the previous version which was working great. In the new version, I added some columns to the join table called seasons, and made a bunch of custom methods that query those columns. As a result, I made the following changes to the view code that you saw above so that I could access those methods on the seasons model: <% @user.seasons.by_product_name.each do |season| %> <%= link_to season.product.name, season.product %> #Note: I couldn't get this loop to work at all, so I settled for the following: #<% @user.varieties.find_all_by_product_id(product.id).each do |variety| %> <%=h season.variety.name.capitalize %> <%end%> <%end%> Here's the log output for that: SQL (0.9ms) SELECT count(DISTINCT "products".id) AS count_products_id FROM "products" INNER JOIN "seasons" ON "products".id = "seasons".product_id WHERE (("seasons".user_id = 1)) Season Load (1.8ms) SELECT "seasons".* FROM "seasons" INNER JOIN "products" ON "products".id = "seasons".product_id WHERE ("seasons".user_id = 1) AND ("seasons".user_id = 1) ORDER BY products.name Product Load (0.7ms) SELECT * FROM "products" WHERE ("products"."id" = 43) ORDER BY products.name CACHE (0.0ms) SELECT "seasons".* FROM "seasons" INNER JOIN "products" ON "products".id = "seasons".product_id WHERE ("seasons".user_id = 1) AND ("seasons".user_id = 1) ORDER BY products.name Product Load (0.4ms) SELECT * FROM "products" WHERE ("products"."id" = 1) ORDER BY products.name Variety Load (0.4ms) SELECT * FROM "varieties" WHERE ("varieties"."id" = 2) ORDER BY name CACHE (0.0ms) SELECT * FROM "products" WHERE ("products"."id" = 1) ORDER BY products.name Variety Load (0.4ms) SELECT * FROM "varieties" WHERE ("varieties"."id" = 8) ORDER BY name CACHE (0.0ms) SELECT * FROM "products" WHERE ("products"."id" = 1) ORDER BY products.name Variety Load (0.4ms) SELECT * FROM "varieties" WHERE ("varieties"."id" = 7) ORDER BY name CACHE (0.0ms) SELECT * FROM "products" WHERE ("products"."id" = 43) ORDER BY products.name CACHE (0.0ms) SELECT count(DISTINCT "products".id) AS count_products_id FROM "products" INNER JOIN "seasons" ON "products".id = "seasons".product_id WHERE (("seasons".user_id = 1)) CACHE (0.0ms) SELECT "seasons".* FROM "seasons" INNER JOIN "products" ON "products".id = "seasons".product_id WHERE ("seasons".user_id = 1) AND ("seasons".user_id = 1) ORDER BY products.name CACHE (0.0ms) SELECT * FROM "products" WHERE ("products"."id" = 1) ORDER BY products.name CACHE (0.0ms) SELECT * FROM "products" WHERE ("products"."id" = 1) ORDER BY products.name CACHE (0.0ms) SELECT * FROM "varieties" WHERE ("varieties"."id" = 8) ORDER BY name I'm having two problems: (1) The :uniq option is not working for products. Three distinct versions of the same product are displaying on the page. (2) The :uniq option is not working for varieties. I don't have validation set up on this yet, and if the user enters the same variety twice, it does appear on the page. In the previous working version, this was not the case. The result I need is that only one product for any given ID displays, and all varieties associated with that ID display along with such unique product. One thing that sticks out to me is the sql call in the most recent log output. It's adding 'count' to the distinct call. I'm not sure why it's doing that or whether it might be an indication of an issue. I found this unresolved lighthouse ticket that seems like it could potentially be related, but I'm not sure if it's the same issue: https://rails.lighthouseapp.com/projects/8994/tickets/2189-count-breaks-sqlite-has_many-through-association-collection-with-named-scope I've tried a million variations on this and can't get it working. Any help is much appreciated!

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• Why can't I get a TRUE return in this prepared statement?

  - by Cortopasta

  I can't seem to get this to do anything but return false. My best guess is that the prepared statement isn't executing, but I have no idea why. private function check_credentials($plain_username, $md5_password) { global $dbcon; $ac = new ac(); $ac->dbconnect(); $userid = $dbcon->prepare('SELECT id FROM users WHERE username = :username AND password = :password LIMIT 1'); $userid->bindParam(':username', $plain_username); $userid->bindParam(':password', $md5_password); $userid->execute(); $id = $userid->fetch(); Return $id; } *EDIT:*I've even tried hard coding the username and password into the function itself to try and isolate the problem like this: private function check_credentials($plain_username, $md5_password) { global $dbcon; $plain_username = "jim"; $md5_username = "waffles"; $ac = new ac(); $ac->dbconnect(); $userid = $dbcon->prepare('SELECT id FROM users WHERE username = :username AND password = :password LIMIT 1'); $userid->bindParam(':username', $plain_username); $userid->bindParam(':password', $md5_password); $userid->execute(); print_r($dbcon->errorInfo()); $id = $userid->fetch(); Return $id; } Still nothing :-/

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• Rake tasks in other files

  - by Arcath

  Im trying to use rake in a project, and if I put everything into Rakefile it will be huge and hard to read/find things, so I tried to stick each namesapce in its own file in lib/rake, i added this to the top of my rake file: Dir['#{File.dirname(__FILE__)}/lib/rake/*.rake'].map { |f| require f } it loads the file no problem, but doesn't have the tasks. I only have one .rake file as a test for now called "servers.rake" and it looks like this: namespace :server do task :test do puts "test" end end so when I run rake server:test id expect to see one line appear saying "test", instead I get rake aborted! Don't know how to build task 'server:test' at first I thought my codes wrong but if I copy the contents of lib/rake/servers.rake into Rakefile it works fine. How do I get rake tasks to work that are in another file?

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• Android 2.2 SDK breaks compatibility with older phones

  - by Tom

  I have recently updated my app to a build tarket of SDK version 8 in order to include the App2SD feature for my users. However I have had reports of devices on SDK 3 (1.5) having problems starting the application, with the following stack trace: ... E/AndroidRuntime(10638): Caused by: android.content.res.Resources$NotFoundException: File res/drawable/title_bar_shadow.9.png from drawable resource ID #0x7f020000 E/AndroidRuntime(10638): at android.content.res.Resources.loadDrawable(Resources.java:1641) E/AndroidRuntime(10638): at android.content.res.TypedArray.getDrawable(TypedArray.java:548) E/AndroidRuntime(10638): at android.view.View.<init>(View.java:1726) E/AndroidRuntime(10638): at android.view.View.<init>(View.java:1675) E/AndroidRuntime(10638): at android.view.ViewGroup.<init>(ViewGroup.java:271) E/AndroidRuntime(10638): at android.widget.LinearLayout.<init>(LinearLayout.java:92) E/AndroidRuntime(10638): ... 26 more E/AndroidRuntime(10638): Caused by: java.io.FileNotFoundException: res/drawable/title_bar_shadow.9.png E/AndroidRuntime(10638): at android.content.res.AssetManager.openNonAssetNative(Native Method) E/AndroidRuntime(10638): at android.content.res.AssetManager.openNonAsset(AssetManager.java:392) E/AndroidRuntime(10638): at android.content.res.Resources.loadDrawable(Resources.java:1634) E/AndroidRuntime(10638): ... 31 more If i change the build target back to version 4 as it was previously this issue goes away, also if i remove any graphical resources from my XML files this issue goes away! Any help would be much appreciated as i currently have a broken app on the market for many users.

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• Core data relationship memory leak

  - by cfihelp

  I have a strange (to me) memory leak when accessing an entity in a relationship. Series and Tiles have an inverse relationship to each other. // set up the fetch request NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Series" inManagedObjectContext:managedObjectContext]; [fetchRequest setEntity:entity]; // grab all of the series in the core data store NSError *error = nil; availableSeries = [[NSArray alloc] initWithArray:[managedObjectContext executeFetchRequest:fetchRequest error:&error]]; [fetchRequest release]; // grab one of the series Series *currentSeries = [availableSeries objectAtIndex:1]; // load all of the tiles attached to the series through the relationship NSArray *myTiles = [currentSeries.tile allObjects]; // 16 byte leak here! Instruments reports back that the final line has a 16 byte leak cause by NSPlaceHolderString. Stack trace: 2 UIKit UIApplicationMain 3 UIKit -[UIApplication _run] 4 CoreFoundation CFRunLoopRunInMode 5 CoreFoundation CFRunLoopRunSpecific 6 GraphicsServices PurpleEventCallback 7 UIKit _UIApplicationHandleEvent 8 UIKit -[UIApplication sendEvent:] 9 UIKit -[UIApplication handleEvent:withNewEvent:] 10 UIKit -[UIApplication _runWithURL:sourceBundleID:] 11 UIKit -[UIApplication _performInitializationWithURL:sourceBundleID:] 12 Memory -[AppDelegate_Phone application:didFinishLaunchingWithOptions:] /Users/cfish/svnrepo/Memory/src/Memory/iPhone/AppDelegate_Phone.m:49 13 UIKit -[UIViewController view] 14 Memory -[HomeScreenController_Phone viewDidLoad] /Users/cfish/svnrepo/Memory/src/Memory/iPhone/HomeScreenController_Phone.m:58 15 CoreData -[_NSFaultingMutableSet allObjects] 16 CoreData -[_NSFaultingMutableSet willRead] 17 CoreData -[NSFaultHandler retainedFulfillAggregateFaultForObject:andRelationship:withContext:] 18 CoreData -[NSSQLCore retainedRelationshipDataWithSourceID:forRelationship:withContext:] 19 CoreData -[NSSQLCore newFetchedPKsForSourceID:andRelationship:] 20 CoreData -[NSSQLCore rawSQLTextForToManyFaultStatement:stripBindVariables:swapEKPK:] 21 Foundation +[NSString stringWithFormat:] 22 Foundation -[NSPlaceholderString initWithFormat:locale:arguments:] 23 CoreFoundation _CFStringCreateWithFormatAndArgumentsAux 24 CoreFoundation _CFStringAppendFormatAndArgumentsAux 25 Foundation _NSDescriptionWithLocaleFunc 26 CoreFoundation -[NSObject respondsToSelector:] 27 libobjc.A.dylib class_respondsToSelector 28 libobjc.A.dylib lookUpMethod 29 libobjc.A.dylib _cache_addForwardEntry 30 libobjc.A.dylib _malloc_internal I think I'm missing something obvious but I can't quite figure out what. Thanks for your help! Update: I've copied the offending chunk of code to the first part of applicationDidFinishLaunching and it still leaks. Could there be something wrong with my model?

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• Circular reference fix?

  - by SXMC

  Hi! I have a Player class in a separate unit as follows: TPlayer = class private ... FWorld: TWorld; ... public ... end; I also have a World class in a separate unit as follows: TWorld = class private ... FPlayer: TPlayer; ... public ... end; I have done it this way so that the Player can get data from the world via FWorld, and so that the other objects in the world can get the player data in a similar manner. As you can see this results in a circular reference (and therefore does not work). I have read that this implies bad code design, but I just can't think of any better other way. What could be a better way to do it? Cheers!

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• Swiping Images with Page Control in Iphone

  - by lakesh

  I am trying to make practice app where i can scroll images with page control. I am able to scroll images and able to include the page control. But the problem i face is i am not able to interlink the two. Meaning to say when I scroll the images, the page control is not affected and when i change the page control, the scrolling of the images is unaffected. I have referred to this: http://www.iosdevnotes.com/2011/03/uiscrollview-paging/ for the scrolling with page control. Viewcontroller.h #import <UIKit/UIKit.h> @interface ViewController : UIViewController <UIScrollViewDelegate>{ UIScrollView *scrollView; UIPageControl *pageControl; BOOL pageControlBeingUsed; } @property (nonatomic, retain) IBOutlet UIScrollView *scrollView; @property (nonatomic, retain) IBOutlet UIPageControl *pageControl; - (IBAction)changePage; @end Viewcontroller.m #import "ViewController.h" @interface ViewController () @end @implementation ViewController @synthesize scrollView,pageControl; - (void)viewDidLoad { [super viewDidLoad]; NSArray *images = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"1.jpeg"],[UIImage imageNamed:@"2.jpeg"],[UIImage imageNamed:@"3.jpeg" ], nil]; self.scrollView.contentSize = CGSizeMake(self.scrollView.frame.size.width * images.count, self.scrollView.frame.size.height); for (int i = 0; i < images.count; i++) { CGRect frame; frame.origin.x = self.scrollView.frame.size.width * i; frame.origin.y = 0; frame.size = self.scrollView.frame.size; UIImageView* imgView = [[UIImageView alloc] init]; imgView.image = [images objectAtIndex:i]; imgView.frame = frame; [scrollView addSubview:imgView]; } } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; self.scrollView = nil; } - (void)scrollViewDidScroll:(UIScrollView *)sender { // Update the page when more than 50% of the previous/next page is visible CGFloat pageWidth = self.scrollView.frame.size.width; int page = floor((self.scrollView.contentOffset.x - pageWidth / 2) / pageWidth) + 1; self.pageControl.currentPage = page; } - (IBAction)changePage{ // update the scroll view to the appropriate page CGRect frame; frame.origin.x = self.scrollView.frame.size.width * self.pageControl.currentPage; frame.origin.y = 0; frame.size = self.scrollView.frame.size; [self.scrollView scrollRectToVisible:frame animated:YES]; pageControlBeingUsed = YES; } - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { pageControlBeingUsed = NO; } - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { pageControlBeingUsed = NO; } @end Need some guidance on this... Thanks..

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• Live video streaming using progressive download (and not RTMP) in Flash

  - by bartekb

  Hi, Is it possible to use progressive download for near real-time playback of a live video stream recorded with a webcam? What I need is that a video stream is recorded on one end, uploaded in real-time to a server and downloaded with a short delay, but in real-time, using progressive download (i.e., HTTP streaming) on another end for playback. Is it possible or does it require the use of RTMP? If it's possible, then does it require that Flash Media Server runs on a server? Thanks!

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• Using a dynamic number of checkboxes in a rails form

  - by TenJack

  I am trying to create a form with a dynamic number of checkboxes that each link to a string that is not a model number but is instead just a word. For examples: <% form_for(@words) do |f| %> <% ["apple","banana","orange"].each do |word| %> <%= f.check_box :word %> <%= f.submit %> <% end %> <% end %> So, if "apple" was checked, it would just send the string "apple" in the params. Anyone know how to do this?

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• problem with ajax on the hosting server

  - by nelly

  when I Implemented chatting Function , I use Ajax to send messages between file to another . so , it is working well on local host . but , when I upload it in to remote server it doesn't work. can U tell me ,why ? is an Ajax need Special configuration ? there is my files that I used : Ajax .js file witch has "ajax_send" function that i used in chatbox.js file chatbox.js file wich consest of functions i used it to send data from php file to another one and it display the state (any user sign in or new sending message and so on ..) user.php file whitch responseble to write user name in the text file usersonline.txt and then display the online users in the online users column. send.php file that write on room1.text recive.php file that read room1.txt and then write the content into the chat box I beleve that the problem comes from the ajax code in Ajax.js File so please help me find out the problem and how to solve it. is ajax needs special server settings ? because it was working at the local host !

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• Rails Multiple Checkboxes with Javascript Dynamic Select

  - by Jack

  Hi, I have followed the Railscast episode 88 to implement a set of dependant drop down menus. In the students-new view, when the student's year is selected, the javascript figures out which courses are available to that year and offers the selection in a new drop down menu. My javascript erb file is here: var courses = new Array(); <% for course in @courses -%> <%for year in course.years -%> courses.push(new Array(<%= year.year_id%>, '<%=h course.title%>', <%= course.id%>)); <%end -%> <% end -%> function yearSelected() { year_id = $('student_year_id').getValue(); options = $('student_course_ids').options; options.length = 1; courses.each(function(course) { if (course[0] == year_id) { options[options.length] = new Option(course[1], course[2]); } }); if (options.length == 1) { $('course_field').hide(); } else { $('course_field').show(); } } document.observe('dom:loaded', function() { yearSelected(); $('student_year_id').observe('change', yearSelected); }); Any my view is as follows: <% form_for(@student) do |f| %> <%= f.error_messages %> <p> <%= f.label :name %><br /> <%= f.text_field :name %> </p> <p> <%= f.label :cid, "CID" %><br /> <%= f.text_field :cid %> </p> <p> <label for="student_year_id">Year:</label> <%= collection_select(:student, :year_id, Year.all, :id, :title, {:prompt => true})%> </p> <p id="course_field"> <label for="student_course_ids">Course:</label> <%= collection_select(:student, :course_ids, Course.find(:all), :id, :title, {:prompt => true}, {:multiple => true})%> </p> <p> <%= f.submit 'Save' %> </p> <% end %> What I would like to do is to add checkboxes instead of the drop down menu. Any suggestions? I previously was using this method, but was not able to get it to work with the new javascript. Cheers

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• Basecamp API Rails

  - by dannymcc

  Hi Everyone, I was wondering if someone could do me massive favour.. I really don't understand how to make use of API's - so I was wondering if, using Basecamp as an example, someone could talk me though the basics. So far I have an application with a dashboard controller/view, I have put basecamp.rb into my /lib directory, added the following to my application_controller: def basecamp_connect Basecamp.establish_connection!('XXXXXX.basecamphq.com', 'USER', 'PASS', false) @basecamp = Basecamp.new end Obviously changing the required parts to my credentials. Next up I have added the following to my dashboard_controller: def index Basecamp::TodoList.find(:all) end Next I presume I have to somehow list the Todo's on the dashboard using some sort of loop. Am I doing the right thing, if so - how on earth do I display all the todo items and if not - what am I doing wrong/missing. It doesn't have to be todo's, anything from basecamp or any other popular API service would be a good start. It's just that I happen to have a basecamp account! Thanks, Danny

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• How to implement a Counter Cache in Rails?

  - by yuval

  I have a posts controller and a comments controller. Post has many comments, and comments belong to Post. The associate is set up with the counter_cache option turned on as such: #Inside post.rb has_many :comments #Inside comment.rb belongs_to :post, :counter_cache => true I have a comments_count column in my posts table that is defaulted to zero, as such: add_column :posts, :comments_count, :integer, :default => 0 In the create action of my comments controller, I have the following code: def create @posts = Post.find(params[:post_id]) @comment = @post.comments.build(params[:comment]) if @comment.save redirect_to root else render :action => 'new' end end My problem: when @comment.save is called, I get the following error: ArgumentError in CommentsController#create wrong number of arguments (2 for 0) Removing :counter_cache => true from comment.rb completely solves the problem, so I'm assuming that it is the cause of this vague error. What am I missing here? How can I save my comment and still have rails take care of my counter_cache for my post? Thanks!

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• Difficulty screen scraping http://www.momondo.com using nokogiri

  - by Khai Kiong

  I have some difficulty to extract the total price (css selector = '.total') from the flight result. http://www.momondo.com/multicity/?Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false#Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false I get the error "undefined method `text' for nil:NilClass nokogiri ". My code desc "Fetch product prices" task :fetch_details => :environment do require 'nokogiri' require 'open-uri' include ERB::Util OneWayFlight.find_all_by_money(nil).each do |flight| url = "http://www.momondo.com/multicity/Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false#Search=true&TripType=oneway&SegNo=1&SO0=KUL&SD0=KBR&SDP0=31-12-2012&AD=2&CA=0,0&DO=false&NA=false" doc = Nokogiri::HTML(open(url)) price = doc.at_css(".total").text[/[0-9\.]+/] flight.update_attribute(:price, price) end end

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• Rails Model Relationship: Has one but also belongs to many

  - by Lowgain

  I have two Models, Modela and Modelb. Modela can only own one Modelb, but Modelb can be a part of many Modela's. What I have right now is class Modela < ActiveRecord::Base has_one :modelb end class Modelb < ActiveRecord::Base belongs_to :modela, :foreign_key => "modela_id" #might not make sense? end Not too sure about the whole :foreign_key thing I was doing there, but it was where it was when I left off. As I am trying to allow Modelb to be part of many Modela's, I don't want to add a modela_id field to the Modelb table. What is the best way to do this?

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• Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error.

  - by Kp

  I get the following error in Chrome every time I try to run my script on a Linux server: Error 324 (net::ERR_EMPTY_RESPONSE): Unknown error. In Firefox it just shows a blank white page. Whenever I run it on my local test server (IIS on Windows 7) it runs exactly the way it should with no errors. I am pretty sure that it is a problem with the imap_open function. error_reporting(E_ALL); echo "test"; // enter gmail username below e.g.-- $m_username = "yourusername"; $m_username = "username"; // enter gmail password below e.g.-- $m_password = "yourpword"; $m_password = "password"; // Enter the mail server to connect to $server = '{imap.gmail.com:993/imap/ssl/novalidate-cert}INBOX'; // enter the number of unread messages you want to display from mailbox or //enter 0 to display all unread messages e.g.-- $m_acs = 0; $m_acs = 10; // How far back in time do you want to search for unread messages - one month = 0 , two weeks = 1, one week = 2, three days = 3, // one day = 4, six hours = 5 or one hour = 6 e.g.-- $m_t = 6; $m_t = 2; //-----------Nothing More to edit below //open mailbox $m_mail = imap_open ($server, $m_username . "@gmail.com", $m_password) // or throw an error or die("ERROR: " . imap_last_error()); // unix time gone by $m_gunixtp = array(2592000, 1209600, 604800, 259200, 86400, 21600, 3600); // Date to start search $m_gdmy = date('d-M-Y', time() - $m_gunixtp[$m_t]); //search mailbox for unread messages since $m_t date $m_search=imap_search ($m_mail, 'ALL'); // Order results starting from newest message rsort($m_search); //if m_acs 0 then limit results if($m_acs 0){ array_splice($m_search, $m_acs); } $read = $_GET[read]; if ($read) { function get_mime_type(&$structure) { $primary_mime_type = array("TEXT", "MULTIPART","MESSAGE", "APPLICATION", "AUDIO","IMAGE", "VIDEO", "OTHER"); if($structure-subtype) { return $primary_mime_type[(int) $structure-type] . '/' .$structure-subtype; } return "TEXT/PLAIN"; } function get_part($stream, $msg_number, $mime_type, $structure = false,$part_number = false) { if(!$structure) { $structure = imap_fetchstructure($stream, $msg_number); } if($structure) { if($mime_type == get_mime_type($structure)) { if(!$part_number) { $part_number = "1"; } $text = imap_fetchbody($stream, $msg_number, $part_number); if($structure->encoding == 3) { return imap_base64($text); } else if($structure->encoding == 4) { return imap_qprint($text); } else { return $text; } } if($structure->type == 1) /* multipart */ { while(list($index, $sub_structure) = each($structure->parts)) { if($part_number) { $prefix = $part_number . '.'; } $data = get_part($stream, $msg_number, $mime_type, $sub_structure,$prefix . ($index + 1)); if($data) { return $data; } } // END OF WHILE } // END OF MULTIPART } // END OF STRUTURE return false; } // END OF FUNCTION // GET TEXT BODY $dataTxt = get_part($m_mail, $read, "TEXT/PLAIN"); // GET HTML BODY $dataHtml = get_part($m_mail, $read, "TEXT/HTML"); if ($dataHtml != "") { $msgBody = $dataHtml; $mailformat = "html"; } else { $msgBody = ereg_replace("\n","",$dataTxt); $mailformat = "text"; } if ($mailformat == "text") { echo "<html><head><title>Messagebody</title></head><body bgcolor=\"white\">$msgBody</body></html>"; } else { echo $msgBody; // It contains all HTML HEADER tags so we don't have to make them. } exit; } //loop it foreach ($m_search as $what_ever) { //get imap header info for obj thang $obj_thang = imap_headerinfo($m_mail, $what_ever); //get body info for obj thang $obj_thangs = imap_body($m_mail, $what_ever); //Then spit it out below.........if you dont swallow echo "Message ID# " . $what_ever . " Date: " . date("F j, Y, g:i a", $obj_thang-udate) . " From: " . $obj_thang-fromaddress . " To: " . $obj_thang-toaddress . " Subject: " . $obj_thang-Subject . " "; } echo "" . $m_empty . ""; //close mailbox imap_close($m_mail); ?

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