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Difference between Repository and Service Layer?
... bool Delete(int id);
T Get(int id);
bool SaveChanges();
}
and call Get(id). Repository layer exposes basic CRUD operations.
Service layer exposes business logic, which uses repository. Example service could look like:
public interface IUserService
{
User GetByUserName(string userN...
How to implement has_many :through relationships with Mongoid and mongodb?
...through or an equivalent feature. It would not be so useful with MongoDB because it does not support join queries so even if you could reference a related collection via another it would still require multiple queries.
https://github.com/mongoid/mongoid/issues/544
Normally if you have a many-many ...
Covariance, Invariance and Contravariance explained in plain English?
...
will.
Another example where the subtype relation matters is a method invocation expression:
result = method(a);
Informally speaking, this statement is evaluated by assigning the value of a to the method's first parameter, then executing the body of the method, and then assigning the methods ret...
How to create a custom attribute in C#
...to a class, property or module - just data. However, using reflection, one can leverage those attributes in order to create functionality.
So, for instance, let's look at the Validation Application Block, from Microsoft's Enterprise Library. If you look at a code example, you'll see:
/// <s...
Differences between ExpandoObject, DynamicObject and dynamic
...ic keyword to interact with a normal instance, the DLR performs late-bound calls to the instance's normal methods.
The IDynamicMetaObjectProvider interface allows a class to take control of its late-bound behavior.
When you use the dynamic keyword to interact with an IDynamicMetaObjectProvider impl...
Java 8: performance of Streams vs Collections
...t(TimeUnit.NANOSECONDS)
@BenchmarkMode(Mode.AverageTime)
@OperationsPerInvocation(StreamVsVanilla.N)
public class StreamVsVanilla {
public static final int N = 10000;
static List<Integer> sourceList = new ArrayList<>();
static {
for (int i = 0; i < N; i++) {
...
Node.js / Express.js - How does app.router work?
... use is app.use() . When the middleware is being executed, it will either call the next middleware by using next() or make it so no more middleware get called. That means that the order in which I place my middleware calls is important, because some middleware depends on other middleware, and som...
.NET Global exception handler in console application
...ine a global exception handler for unhandled exceptions in my console application. In asp.net, one can define one in global.asax, and in windows applications /services, one can define as below
...
Change one value based on another value in pandas
...
One option is to use Python's slicing and indexing features to logically evaluate the places where your condition holds and overwrite the data there.
Assuming you can load your data directly into pandas with pandas.read_csv then the following code might be helpful for you.
import pandas
df...
Decompile .smali files on an APK [duplicate]
... it.
dex2jar: https://github.com/pxb1988/dex2jar
jd-gui: http://jd.benow.ca/
Edit: I knew there was somewhere here in SO a question with very similar answers... decompiling DEX into Java sourcecode
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