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What is the “__v” field in Mongoose
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Is there a way to hide it from the returned docs from the queries?
– diosney
Dec 14 '13 at 20:41
6
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Group by in LINQ
...ant:
var results = from p in persons
group p.car by p.PersonId into g
select new { PersonId = g.Key, Cars = g.ToList() };
Or as a non-query expression:
var results = persons.GroupBy(
p => p.PersonId,
p => p.car,
(key, g) => new { PersonId = key, ...
What are all the differences between src and data-src attributes?
...image tag where the image loads the JPEG for you and displays it:
<img id="myImage" src="http://mydomain.com/foo.jpg">
<script>
var imageUrl = document.getElementById("myImage").src;
</script>
Example of 'data-src' on a non-image tag where the image is not loaded yet - it's...
Convert JSON to Map
...ou work with Maven project, you will need <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.4.4</version> </dependency>
– LoBo
Nov 2 '15 a...
淘宝应对双\"11\"的技术架构分析 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...带来了挑战。为此，我们设计了通用的数据中间层——glider——来屏蔽这个影响。glider以HTTP协议对外提供restful方式的接口。数据产品可以通过一个唯一的URL获取到它想要的数据。
以上是淘宝海量数据产品在技术架构方面的一...
`Apache` `localhost/~username/` not working
...rectory "/Users/kevin/Sites/">
Options Indexes MultiViews
AllowOverride None
Require all granted
</Directory>
Make sure to restart the Apache server afterwards with:
sudo apachectl restart
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Heroku error: “Permission denied (public key)”
...add <path-to-your-public-key>.
For example, heroku keys:add ~/.ssh/id_rsa.pub
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How to avoid having class data shared among instances?
... def __init__(self):
self.list = []
Declaring the variables inside the class declaration makes them "class" members and not instance members. Declaring them inside the __init__ method makes sure that a new instance of the members is created alongside every new instance of the object, whi...
Preview layout with merge root tag in Intellij IDEA/Android Studio
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There is a new parentTag tools attribute (added in Android Studio 2.2) that you can use to specify the layout type for a merge tag, which will make the layout render correctly in the layout editor preview.
So using your example:
<merge xmlns:android="http://schemas.android.c...
How to get first element in a list of tuples?
I have a list like below where the first element is the id and the other is a string:
12 Answers
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