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What is Rack middleware?
...equest. Rack allows you to add multiple middlewares that are called in the order they are added. It's just a great way to add functionality without changing the core of the rack application.
Rack - The Gem
Although rack - first of all - is a convention it also is a gem that provides great function...
What is eager loading?
What is eager loading? I code in PHP/JS but a more generalised answer will be just fine.
4 Answers
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#include in .h or .c / .cpp?
...ample above, then header A should include header B directly. Do NOT try to order your includes in the .c file to satisfy dependencies (that is, including header B before header A); that is a big ol' pile of heartburn waiting to happen. I mean it. I've been in that movie several times, and it alway...
What is the difference between an ORM and an ODM?
...u can have hybrid ORM/ODM frameworks, like mORMot for Delphi, Doctrine for PHP or Hibernate OGM for Java. And some SQL databases have strong support to documents, e.g. the great PostgresSQL which features JSON or JSONB data types so you can mix RDBMS and Document-oriented storage within the same tab...
Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.
...l attempt and the following answer is no longer necessary.
You can use DT[order(-rank(x), y)].
x y v
1: c 1 7
2: c 3 8
3: c 6 9
4: b 1 1
5: b 3 2
6: b 6 3
7: a 1 4
8: a 3 5
9: a 6 6
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Resize svg when window is resized in d3.js
...sive
http://soqr.fr/testsvg/embed-svg-liquid-layout-responsive-web-design.php
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What characters are valid for JavaScript variable names?
...s vary, but you’ll safely have 1000 characters and probably several more orders of magnitude than that.)
Links to the character categories:
Letters: Lu, Ll, Lt, Lm, Lo, Nl(combined in the regex above as “L”)
Combining marks (“modifiers”): Mn, Mc
Digits: Nd
Connectors: Pc
*n.b. This ...
PostgreSQL array_agg order
...8.4/static/functions-aggregate.html
In the current implementation, the order of the input is in principle unspecified. Supplying the input values from a sorted subquery will usually work, however. For example:
SELECT xmlagg(x) FROM (SELECT x FROM test ORDER BY y DESC) AS tab;
So in your c...
Placing/Overlapping(z-index) a view above another view in android
...you can use a FrameLayout. In a FrameLayout, the z-index is defined by the order in which the items are added, for example:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
&l...
Does the join order matter in SQL?
...
For INNER joins, no, the order doesn't matter. The queries will return same results, as long as you change your selects from SELECT * to SELECT a.*, b.*, c.*.
For (LEFT, RIGHT or FULL) OUTER joins, yes, the order matters - and (updated) things are...