I have been looking to get to grips with devise and its workings and have kind of fallen at the first hurdle.  I have looked in a few places but cannot seem to find someone with this error exactly.

So I have created a simple Home controller with an index view and added root &#39;home#index&#39; and also ensured the default url options are setup in the development.rb file.  I then simply typed:

    rails generate devise User

This created my user.rb file in models with the following:

    class User &lt; ActiveRecord::Base
      # Include default devise modules. Others available are:
      # :confirmable, :lockable, :timeoutable and :omniauthable
      devise :database_authenticatable, :registerable,
             :recoverable, :rememberable, :trackable, :validatable
    end
Pretty straightforward so far, I have the following Gemfile:

    source &#39;https://rubygems.org&#39;
    gem &#39;rails&#39;, &#39;4.0.5&#39;
    gem &#39;sqlite3&#39;
    gem &#39;sass-rails&#39;, &#39;~&gt; 4.0.2&#39;
    gem &#39;devise&#39;
    gem &#39;uglifier&#39;, &#39;&gt;= 1.3.0&#39;
    gem &#39;coffee-rails&#39;, &#39;~&gt; 4.0.0&#39;
    gem &#39;jquery-rails&#39;
    gem &#39;turbolinks&#39;
    gem &#39;jbuilder&#39;, &#39;~&gt; 1.2&#39;
    group :doc do
      gem &#39;sdoc&#39;, require: false
    end
    gem &#39;bcrypt&#39;

And when I run either rake db:migrate I get the following error:

    rake aborted!
    NoMethodError: undefined method `devise&#39; for User (call &#39;User.connection&#39; to establish a connection):Class
    /home/jonlee/.rvm/gems/ruby-2.1.1@railstutorial_rails_4_0/gems/activerecord-4.0.5/lib/active_record/dynamic_matchers.rb:22:in `method_missing&#39;
    /home/jonlee/Projects/rails/userauth/app/models/user.rb:4:in `&lt;class:User&gt;&#39;
    /home/jonlee/Projects/rails/userauth/app/models/user.rb:1:in `&lt;top (required)&gt;&#39;
Im at a loss as to why the User model cannot find the &#39;devise&#39; method when as far as I can see it is definitely there.

I get similar errors with rake routes, rails server and rails console.

For further info I am using ruby 2.1.1 if that helps?

undefined method &#39;devise&#39; for User

Using psycopg2 package with python 2.7 I keep getting the titled error: psycopg2.DatabaseError: SSL SYSCALL error: EOF detected

It only occurs when I add a `WHERE column LIKE &#39;&#39;%X%&#39;&#39;` clause to my pgrouting query. An example:

    SELECT id1 as node, cost FROM PGR_Driving_Distance(
      &#39;SELECT id, source, target, cost 
         FROM edge_table
         WHERE cost IS NOT NULL and column LIKE &#39;&#39;%x%&#39;&#39; &#39;,
      1, 10, false, false)

Threads on the internet suggest it is an issue with SSL intuitively, but whenever I comment out the pattern matching side of things the query and connection to the database works fine.

This is on a local database running Xubuntu 13.10.

After further investigation: It looks like this may be cause by the pgrouting extension crashing the database because it is a bad query and their are not links which have this pattern.

Will post an answer soon ...




Postgres SSL SYSCALL error: EOF detected with python and psycopg

How to expose custom buttons when user swipe a cell in table view (like mail app in iOS 8)

I would like that when the user swiping on a table view cell, to expose buttons (The default is the delete button in iOS 7 and early). 
In the Mail app for iOS 8 you can swipe and expose 3 buttons “More” &quot;Flag&quot; &quot;Archive&quot;.
I want to display other buttons with different color and title.

Is Apple provides API in UITableView for this ?

Thanks

Swipe to expose “More” &quot;Flag&quot; &quot;Archive&quot; buttons (like in Mail app on iOS 8)

How to expose custom buttons when user swipe a cell in table view (like mail app in iOS 8)
I would like that when the user swiping on a table view cell, to expose buttons (The default is the delete button in iOS 7 and early).
In the Mail app for iOS 8 you can swipe and expose 3 buttons “More” "Flag" "Archive".
I want to display other buttons with different color and title.
Is Apple provides API in UITableView for this ?
Thanks

I have a custom cell class with a couple of IBOutlets. I have added the class to the storyboard. I have connected all my outlets. my cellForRowAtIndexPath function looks like this:

    override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -&gt; UITableViewCell! {
            let cell = tableView.dequeueReusableCellWithIdentifier(&quot;Cell&quot;, forIndexPath: indexPath) as SwipeableCell
            
            cell.mainTextLabel.text = self.venueService.mainCategoriesArray()[indexPath.row]
            
            return cell
        }

Here is my custom cell class:

    class SwipeableCell: UITableViewCell {
        @IBOutlet var option1: UIButton
        @IBOutlet var option2: UIButton
        @IBOutlet var topLayerView : UIView
        @IBOutlet var mainTextLabel : UILabel
        @IBOutlet var categoryIcon : UIImageView
        
        init(style: UITableViewCellStyle, reuseIdentifier: String!) {
            super.init(style: style, reuseIdentifier: reuseIdentifier)
            
            
        }
    }

When I run the app, all my cell are empty. I have logged out `self.venueService.mainCategoriesArray()` and it contains all the correct strings. I have also tried putting an actual string equal to the label, and that produces the same result. 

What am I missing? Any help is appreciated.

creating custom tableview cells in swift

I am trying to have a transparent navigation bar in IOS 7 app. There is a full screen image in my application. I am also having a UITableView over that image. When I use the code below, image fits the screen as I want but UITableView goes under navigation bar.

in `viewDidLoad`

i use

    self.navigationController.navigationBar.shadowImage = [UIImage new];
    self.navigationController.navigationBar.translucent = YES;
    self.navigationController.view.backgroundColor = [UIColor clearColor];


it is being ok when I change to `self.navigationController.navigationBar.translucent = NO;` but then I lose transparency at navigation bar.

UITableView goes under translucent Navigation Bar

I have a `UITableView` running under iOS 8 and I&#39;m using automatic cell heights from constraints in a storyboard.

One of my cells contains a single `UITextView` and I need it to contract and expand based on user input - tap to shrink/expand the text.

I&#39;m doing this by adding a runtime constraint to the text view and changing the constant on the constraint in response to user events:

    -(void)collapse:(BOOL)collapse; {
    
        _collapsed = collapse;
    
        if(collapse)
            [_collapsedtextHeightConstraint setConstant: kCollapsedHeight]; // 70.0
        else
            [_collapsedtextHeightConstraint setConstant: [self idealCellHeightToShowFullText]];
    
        [self setNeedsUpdateConstraints];
    
    }

Whenver I do this, I wrap it in `tableView` updates and call `[tableView setNeedsUpdateConstraints]`:

    [tableView beginUpdates];
    
    [_briefCell collapse:!_showFullBriefText];
    
    [tableView setNeedsUpdateConstraints];
    // I have also tried 
    // [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationTop];
    // with exactly the same results.
    
    [tableView endUpdates];

When I do this, my cell does expand (and animates whilst doing it) but I get a constraints warning:

    2014-07-31 13:29:51.792 OneFlatEarth[5505:730175] Unable to simultaneously satisfy constraints.
    
	Probably at least one of the constraints in the following list is one you don&#39;t want. Try this: (1) look at each constraint and try to figure out which you don&#39;t expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you&#39;re seeing NSAutoresizingMaskLayoutConstraints that you don&#39;t understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 

    (
    
        &quot;&lt;NSLayoutConstraint:0x7f94dced2b60 V:[UITextView:0x7f94d9b2b200&#39;Brief text: Lorem Ipsum i...&#39;(388)]&gt;&quot;,
    
        &quot;&lt;NSLayoutConstraint:0x7f94dced2260 V:[UITextView:0x7f94d9b2b200&#39;Brief text: Lorem Ipsum i...&#39;]-(15)-|   (Names: &#39;|&#39;:UITableViewCellContentView:0x7f94de5773a0 )&gt;&quot;,
    
        &quot;&lt;NSLayoutConstraint:0x7f94dced2350 V:|-(6)-[UITextView:0x7f94d9b2b200&#39;Brief text: Lorem Ipsum i...&#39;]   (Names: &#39;|&#39;:UITableViewCellContentView:0x7f94de5773a0 )&gt;&quot;,
    
        &quot;&lt;NSLayoutConstraint:0x7f94dced6480 &#39;UIView-Encapsulated-Layout-Height&#39; V:[UITableViewCellContentView:0x7f94de5773a0(91)]&gt;&quot;
     )
    
    Will attempt to recover by breaking constraint 
    
    &lt;NSLayoutConstraint:0x7f94dced2b60 V:[UITextView:0x7f94d9b2b200&#39;Brief text: Lorem Ipsum i...&#39;(388)]&gt;

388 is my calculated height, the other constraints on the `UITextView` are mine from Xcode/IB.

The final one is bothering me - I&#39;m guessing that `UIView-Encapsulated-Layout-Height` is the calculated height of the cell when it is first rendered - (I set my `UITextView` height to be &gt;= 70.0) however it doesn&#39;t seem right that this derived constraint then overrules an updated user cnstraint.

Worse, although the layout code says it&#39;s trying to break my height constraint, it doesn&#39;t - it goes on to recalculate the cell height and everything draws as I would like.

So, what is `NSLayoutConstraint` `UIView-Encapsulated-Layout-Height` (I&#39;m guessing it is the calculated height for automatic cell sizing) and how should I go about forcing it to recalculate cleanly?

What is NSLayoutConstraint &quot;UIView-Encapsulated-Layout-Height&quot; and how should I go about forcing it to recalculate cleanly?

Is anyone else having an issue using the `tableView.registerClass` method with Swift?

It no longer comes in code completion for me (nor can I use it if manually typed) but it is still in the headers...

![Code Completion][1]

![UITableView headers][2]


  [1]: http://i.stack.imgur.com/n7IVV.png
  [2]: http://i.stack.imgur.com/C4XFh.png

UITableView - registerClass with Swift

I&#39;m trying to create a custom table view cell from a nib. I&#39;m referring to this article [here][1]. I&#39;m facing two issues.

I created a .xib file with a UITableViewCell object dragged on to it. I created a subclass of `UITableViewCell` and set it as the cell&#39;s class and *Cell* as the reusable identifier.

    import UIKit
    
    class CustomOneCell: UITableViewCell {
    
        @IBOutlet weak var middleLabel: UILabel!
        @IBOutlet weak var leftLabel: UILabel!
        @IBOutlet weak var rightLabel: UILabel!
        
        required init(coder aDecoder: NSCoder!) {
            super.init(coder: aDecoder)
        }
        
        override init(style: UITableViewCellStyle, reuseIdentifier: String!) {
            super.init(style: style, reuseIdentifier: reuseIdentifier)
        }
        
        override func awakeFromNib() {
            super.awakeFromNib()
            // Initialization code
        }
    
        override func setSelected(selected: Bool, animated: Bool) {
            super.setSelected(selected, animated: animated)
    
            // Configure the view for the selected state
        }
    
    }

In the UITableViewController I have this code,

    import UIKit
    
    class ViewController: UITableViewController, UITableViewDataSource, UITableViewDelegate {
        
        var items = [&quot;Item 1&quot;, &quot;Item2&quot;, &quot;Item3&quot;, &quot;Item4&quot;]
        
        override func viewDidLoad() {
            super.viewDidLoad()
        }
        
        // MARK: - UITableViewDataSource
        override func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -&gt; Int {
            return items.count
        }
        
        override func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -&gt; UITableViewCell! {
            let identifier = &quot;Cell&quot;
            var cell: CustomOneCell! = tableView.dequeueReusableCellWithIdentifier(identifier) as? CustomOneCell
            if cell == nil {
                tableView.registerNib(UINib(nibName: &quot;CustomCellOne&quot;, bundle: nil), forCellReuseIdentifier: identifier)
                cell = tableView.dequeueReusableCellWithIdentifier(identifier) as? CustomOneCell
            }
            
            return cell
        }
    }

This code complies with no errors but when I run it in the simulator, it looks like this.

![enter image description here][2]

In the UITableViewController in the storyboard I haven&#39;t done anything to the cell. Blank identifier and no subclass. I tried adding the *Cell* identifier to the prototype cell and ran it again but I get the same result.

Another error I faced is, when I tried to implement the following method in the UITableViewController.

    override func tableView(tableView: UITableView!, willDisplayCell cell: CustomOneCell!, forRowAtIndexPath indexPath: NSIndexPath!) {
        
        cell.middleLabel.text = items[indexPath.row]
        cell.leftLabel.text = items[indexPath.row]
        cell.rightLabel.text = items[indexPath.row]
    }

As shown in the article I mentioned I changed the `cell` parameter&#39;s type form `UITableViewCell` to `CustomOneCell` which is my subclass of UITableViewCell. But I get the following error,

**Overriding method with selector &#39;tableView:willDisplayCell:forRowAtIndexPath:&#39; has incompatible type &#39;(UITableView!, CustomOneCell!, NSIndexPath!) -&gt; ()&#39;**


Anyone have any idea how to resolve these errors? These seemed to work fine in Objective-C.

Thank you.

EDIT: I just noticed if I change the simulator&#39;s orientation to landscape and turn it back to portrait, the cells appear! I still couldn&#39;t figure out what&#39;s going on. I uploaded an Xcode project [here][3] demonstrating the problem if you have time for a quick look.


  [1]: https://medium.com/@musawiralishah/creating-custom-uitableviewcell-using-nib-xib-files-in-xcode-9bee5824e722
  [2]: http://i.stack.imgur.com/sElI3m.png
  [3]: https://www.dropbox.com/s/f239q1hoagzmcqy/CustomCells.zip?dl=0

Custom UITableViewCell from nib in Swift

I want to create category of my existing swift class, but there is no option in IDE to do so.

Any idea if category exists in swift project? Or how to achieve similar functionality in swift project? 

How to create swift class for category?

I have this expression which returns a `UInt32`:

    let randomLetterNumber = arc4random()%26

I want to be able to use the number in this if statement:

    if letters.count &gt; randomLetterNumber{
        var randomLetter = letters[randomLetterNumber]
    }

This issue is that the console is giving me this


    Playground execution failed: error: &lt;REPL&gt;:11:18: error: could not find an overload for &#39;&gt;&#39; that accepts the supplied arguments
    if letters.count &gt; randomLetterNumber{
       ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~

The problem is that `UInt32` cannot be compared to an `Int`. I want to cast `randomLetterNumber` to an `Int`. I have tried:


    let randomLetterUNumber : Int = arc4random()%26
    let randomLetterUNumber = arc4random()%26 as Int

These both cause `could not find an overload for &#39;%&#39; that accepts the supplied arguments.`

 How can I cast the value or  use it in the if statement?   


    

Swift convert UInt to Int

In objectiveC I would do this

    UIImage *image = [[UIImage imageNamed:@&quot;myImage.png&quot;] 	imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

but in Swift I have tried all alternatives like this, without success

    var image : UIImage = UIImage(named:&quot;myImage.png&quot;).imageWithRenderingMode(renderingMode: AlwaysOriginal)

It shows an error: **use of unresolved identifier &#39;AlwaysOriginal&#39;**

How do I do that?


Creating UIImage with renderingMode in Swift

Following instructions, I&#39;ve created a bridging header and added to my project. Unfortunately, the following error occurred:

&gt; &lt;unknown&gt;:0: error: could not import Objective-C header &#39;---path--to---header/....h&#39;

[![Screenshot 1][1]][1]

In build settings I added header search path string to the location of bridging header, but nothing helped. 

Has anyone experienced this problem?


  [1]: http://i.stack.imgur.com/s04sE.png

Swift Bridging Header import issue

I need to store a value as a `Float`, but the source data is a `CGFloat`:

    let myFloat : Float = myRect.origin.x

but this results in the compiler error: &#39;NSNumber&#39; is not of subtype &#39;Float&#39;

So if I explicitly cast it like this:

    let myFloat : Float = myRect.origin.x as Float

but this in turn results in the compiler error: &#39;Cannot convert the expression&#39;s type &#39;Float&#39; to &#39;Float&#39;&#39;

What&#39;s the correct way to do this and satisfy the compiler please?

Casting CGFloat to Float in Swift

I was fiddling with Xcode 6 vs images assets when I noticed something **very** interesting: we now can specify vector images in them (go see in the Utilities pane after selecting Images.xcassets).

I tried a small app (containing a big UIImageView) with a .SVG image (didn&#39;t work), then a .EPS (didn&#39;t work either) and I finally tried a .PDF It worked! Well, although I saw the image, It appeared pixellated and not vectorized.

So it seems Apple is preparing the way for vector icons/images. No more zillions versions of app icons, no more &quot;@2x&quot; images. But can anyone unlock that feature?


Xcode 6 allows VECTOR image assets... how to use them?

I ran the following code in both iOS 7 and iOS 8:

    UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation];
    BOOL landscape = (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight);
    NSLog(@&quot;Currently landscape: %@, width: %.2f, height: %.2f&quot;, 
          (landscape ? @&quot;Yes&quot; : @&quot;No&quot;), 
          [[UIScreen mainScreen] bounds].size.width, 
          [[UIScreen mainScreen] bounds].size.height);
The following is the result from iOS 8:

    Currently landscape: No, width: 320.00, height: 568.00
    Currently landscape: Yes, width: 568.00, height: 320.00

Comparing to the result in iOS 7:

    Currently landscape: No, width: 320.00, height: 568.00
    Currently landscape: Yes, width: 320.00, height: 568.00

Is there any documentation specifying this change? Or is it a temporary bug in iOS 8 APIs?

Is [UIScreen mainScreen].bounds.size becoming orientation-dependent in iOS8?

Xcode 6 interface builder by default has new checkbox &quot;use size classes&quot;. It makes views adaptive.
![enter image description here][1]

When I try to make segue between 2 views in my storyboard I have new options:
![enter image description here][2]

instead old:

![enter image description here][3]


Now we have &quot;show&quot; and &quot;present modally&quot; instead of &quot;push&quot; and &quot;modal&quot;. The old options are marked as deprecated. I&#39;ve chosen &quot;show&quot; option, because in segue settings it called &quot;show (e.g. push)

![enter image description here][4]

But it doesn&#39;t make push. Segue animation looks like slide from the bottom (modal) and navigation bar disappears. 

Question is: How can I make &quot;show&quot; work like push? Is it possible or should I use &quot;push (deprecated)&quot; instead? Where can I find any information about new types of segue? The only thing that I&#39;ve found in iOS8 developer library is [Storyboards Help You Design Your User Interface](https://developer.apple.com/library/prerelease/ios/featuredarticles/ViewControllerPGforiPhoneOS/AboutViewControllers/AboutViewControllers.html#//apple_ref/doc/uid/TP40007457-CH112-SW36) but there is no information about &quot;show&quot; segue.

# UPDATE
I tried to create new project and &quot;show&quot; is really works like &quot;push&quot;.
I think the issue in my project can be because I reuse navigation controller with code like this, but I don&#39;t know how to fix it.

    if ( [segue isKindOfClass: [SWRevealViewControllerSegue class]] ) {
        SWRevealViewControllerSegue *swSegue = (SWRevealViewControllerSegue*) segue;
        
        swSegue.performBlock = ^(SWRevealViewControllerSegue* rvc_segue, UIViewController* svc, UIViewController* dvc) {
            
            UINavigationController* navController = (UINavigationController*)self.revealViewController.frontViewController;
            [navController setViewControllers: @[dvc] animated: NO ];
            [self.revealViewController setFrontViewPosition: FrontViewPositionLeft animated: YES];
        };
        
    }

After that I try to push NewViewController after MainViewController
![enter image description here][5]

# UPDATE 2: 
I seems to be only iOS 7, iOS 7.1 issue.


  [1]: http://i.stack.imgur.com/hdOls.png
  [2]: http://i.stack.imgur.com/IkDXR.png
  [3]: http://i.stack.imgur.com/le75A.png
  [4]: http://i.stack.imgur.com/3uPOx.png
  [5]: http://i.stack.imgur.com/Tzo4p.png

Adaptive segue in storyboard Xcode 6. Is push deprecated?

How can I get the Device Token for remote notification in iOS 8?
I used the method `didRegisterForRemoteNotificationsWithDeviceToken` in `AppDelegate` in iOS &lt; 8, and it returned the device token. But in iOS 8, it does not.

Swipe to expose “More” "Flag" "Archive" buttons (like in Mail app on iOS 8)

Uitableview Problem Overview

Uitableview Solutions

Postgres SSL SYSCALL error: EOF detected with python and psycopg

undefined method 'devise' for User

Attributions