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What does !! mean in ruby?

...rn false end end class LinkStatus::Denied < LinkStatus end Then in service code I have, for example: raise Application::Error unless !!object.link_status # => raises exception for "No" and "Denied" states. Effectively the bangbang operator has become what I might otherwise have writt...
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Missing Push Notification Entitlement

...cation enabled) App Store and Ad Hoc certificate Apple Push Notification service SSL (Sandbox) certificate Third Provisioning Profiles From Distribution section create App Store profile with your id Finally while you upload your bin , you must check what provisioning profile used...
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data type not understood

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Spring MVC: How to perform validation?

...ate it in the default constructor of the controller. Or have a @Component/@Service UserValidator that you inject (@Autowired) in your controller : very useful, because most validators are singletons + unit test mocking becomes easier + your validator could call other Spring components. Method 3 : ...
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index.php not loading by default

...irectoryIndex index.html Using the commands: sudo a2enmod dir sudo sudo service apache2 restart Fixed the issue. share | improve this answer | follow | ...
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What is your preferred php deployment strategy? [closed]

...lternative to home-made deployment scripts is to deploy to a platform-as-a-service which abstracts away a lot of that work for you. A PaaS will typically offer its own code deployment tool, as well as scaling, fault-tolerance (eg. not going down when hardware fails), and usually a great toolkit for ...
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Google Maps v2 - set both my location and zoom in

...MyLocationEnabled(true); locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE); locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME, MIN_DISTANCE, this); } @Override public void onLocationChanged(Location location) { LatLng latL...
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“used as value” in function call

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Command-line Tool to find Java Heap Size and Memory Used (Linux)?

...et dynamic information without JMX by default but you could write your own service to do this. BTW: I prefer to use VisualVM rather than JConsole. share | improve this answer | ...
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Disable all gcc warnings

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