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Why use Ruby instead of Smalltalk? [closed]
...rary of most of the main smalltalk implementations (VisualWorks, VisualAge etc.) was large and had reputation for a fairly steep learning curve. Most key functionality in Smalltalk is hidden away somewhere in the class library, even basic stuff like streams and collections. The language paradigm i...
Is it possible to run JavaFX applications on iOS, Android or Windows Phone 8?
...st is Desktop (Mac,windows,linux) and Embedded (Raspberry Pi, beagle Board etc) .For iOS/android oracle done most of the hardwork and opnesourced javafxports of these platforms as part of OpenJFX ,but there is no JVM from oracle for ios/android.Community is putting all together by filling missing pi...
What is the difference D3 datum vs. data?
..., both of these methods can also be invoked without any input arguments in order to query the bound data/datum in the selection, in which case they once again behave differently and return different things.
Edit - I posted a slightly more detailed answer to this question here, but the post below p...
Full Page
...eems like it's taking away the responsiveness (i.e. collapsing of columns, etc) from the content within the iframe. But somehow only when opening the page with mobile safari, not when resizing a desktop browser. Any ideas what could cause that behaviour?
– psteinweber
...
How do you write a migration to rename an ActiveRecord model and its table in Rails?
... add_index :old_table_name, :column_name
end
end
And rename your files etc, manually as other answers here describe.
See: http://api.rubyonrails.org/classes/ActiveRecord/Migration.html
Make sure you can rollback and roll forward after you write this migration. It can get tricky if you get some...
Convert pem key to ssh-rsa format
... -f dummy-xxx.pem
Notes
OS and software version:
[user@test1 ~]# cat /etc/redhat-release ; uname -a ; openssl version
CentOS release 6.5 (Final)
Linux test1.example.local 2.6.32-431.el6.x86_64 #1 SMP Fri Nov 22 03:15:09 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
OpenSSL 1.0.1e-fips 11 Feb 2013
R...
How to configure MongoDB Java driver MongoOptions for production use?
...t of connections eventually even if the actual query throughput is low (in order words you will see the "conn" statistic in mongostat rise until it hits this number per app server).
There is no need to set this higher than 100 in most cases but this setting is one of those "test it and see" things...
How to remove a single, specific object from a ConcurrentBag?
...
You can't. Its a bag, it isn't ordered. When you put it back, you'll just get stuck in an endless loop.
You want a Set. You can emulate one with ConcurrentDictionary. Or a HashSet that you protect yourself with a lock.
...
What is the difference between Modal and Push segue in Storyboards?
...er, you will lose all the features like navigation bar, animation, gesture etc when you do so. In this case, you should embed your parent view controller inside navigation view controller first and then make push segue to child view controllers.
2. Modal Segue
A modal segue (i.e. present modally...
How to copy an object in Objective-C
...lways, it's not what you want. Objects have internal state, other objects, etc, and often make assumptions that they're the only ones holding references to that data. Bitwise copies break this assumption.
A deep, logical copy. In this, we make a copy of the object, but without actually doing it bit ...