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What exactly is Arel in Rails 3.0?
...ment for named_scopes. In fact, ARel is pretty much the realization of the idea that "every query is a named_scope". And, whaddayaknow: both were written by the same guy.
and that it uses objects instead of queries.
No, it uses objects as queries.
why is this better?
Ruby is an object-oriented l...
Using Spring MVC Test to unit test multipart POST request
...ic String getJson() {
return json;
}
public void setJson(String json) {
this.json = json;
}
}
}
and a unit test
@WebAppConfiguration
@ContextConfiguration(classes = WebConfig.class)
@RunWith(SpringJUnit4ClassRunner.class)
public class Example...
Serializing an object as UTF-8 XML in .NET
...into a string again, so its no longer in UTF-8, but back in UTF-16 (though ideally its best to consider strings at a higher level than any encoding, except when forced to do so).
To get the actual UTF-8 octets you could use:
var serializer = new XmlSerializer(typeof(SomeSerializableObject));
var ...
What is a .snk for?
...ts of
a simple text name, version number,
and culture information (if
provided)—plus a public key and a
digital signature.
The SNK contains a unique key pair - a private and public key that can be used to ensure that you have a unique strong name for the assembly. When the assembly is strongly-n...
Why does Dijkstra's algorithm use decrease-key?
...stra's beyond what's possible if you keep doing enqueues and dequeues.
Besides this point, some more advanced algorithms, such as Gabow's Shortest Paths Algorithm, use Dijkstra's algorithm as a subroutine and rely heavily on the decrease-key implementation. They use the fact that if you know the r...
Find XOR of all numbers in a given range
...e every 4. So, that's how to arrive at that little lookup table.
Now, consider for a general range of [a,b]. We can use f() to find the XOR for [0,a-1] and [0,b]. Since any value XOR'd with itself is zero, the f(a-1) just cancels out all the values in the XOR run less than a, leaving you with the X...
When do I need to use a semicolon vs a slash in Oracle SQL?
...one) tool to execute SQL scripts - and the "correctness" of a script is validated using that tool. Similar to having one compiler for your programming language or one specific version of your runtime environment (Java 7, .Net 4.0, PHP 5.x, ...)
– a_horse_with_no_name
...
using gitignore to ignore (but not delete) files
...ing your changes will apply the removal. I don't think there's a way to avoid that from your own repository. You must do something on the other repositories, or accept the files will be removed.
To prevent the removal on each other repository you can:
(obviously) backup the files somewhere, pull ...
Python - write() versus writelines() and concatenated strings
...e a string for a newline in write() but I can use it in writelines()?
The idea is the following: if you want to write a single string you can do this with write(). If you have a sequence of strings you can write them all using writelines().
write(arg) expects a string as argument and writes it to ...
What's the difference between an exclusive lock and a shared lock?
...ad threads to wait when write thread is started waiting? Because how to avoid starvation of write thread because of continuous read request?
– Kanagavelu Sugumar
Jun 22 '16 at 12:31
...