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What's the $unwind operator in MongoDB?
... the following:
db.article.aggregate(
{ $project : {
author : 1 ,
title : 1 ,
tags : 1
}},
{ $unwind : "$tags" }
);
would return the following documents:
{
"result" : [
{
"_id" : ObjectId("4e6e4ef557b77501a49233f6"),
...
URL matrix parameters vs. query parameters
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213
The important difference is that matrix parameters apply to a particular path element while que...
Scala underscore - ERROR: missing parameter type for expanded function
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1 Answer
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How can I convert NSDictionary to NSData and vice versa?
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edited Nov 5 '13 at 15:54
KIDdAe
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ans...
C++11 range based loop: get item by value or reference to const
Reading some examples of range based loops they suggest two main ways 1, 2, 3, 4
4 Answers
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Restore file from old commit in git
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edited Jan 9 '13 at 18:23
Colin R
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an...
After array_filter(), how can I reset the keys to go in numerical order starting at 0
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edited Jun 21 at 16:51
Salman A
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WPF Databinding: How do I access the “parent” data context?
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answered Jul 14 '09 at 20:51
flqflq
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What is the Scala identifier “implicitly”?
... a type with selection defined, or equivalent implicit methods.
scala> 1.min(2) // Int doesn't have min defined, where did that come from?
res21: Int = 1
scala> implicitly[Int => { def min(i: Int): Any }]
res22: (Int) => AnyRef{def min(i: Int): Any} =...
SQLite select where empty?
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answered Sep 1 '10 at 18:06
GuffaGuffa
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