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Ruby on Rails. How do I use the Active Record .build method in a :belongs to relationship?
...m the API documentation under the has_many association in "Module ActiveRecord::Associations::ClassMethods"
collection.build(attributes = {}, …)
Returns one or more new objects of the
collection type that have been
instantiated with attributes and
linked to this object through a
fore...
What is the difference between exit and return? [duplicate]
...
return returns from the current function; it's a language keyword like for or break.
exit() terminates the whole program, wherever you call it from. (After flushing stdio buffers and so on).
The only case when both do (nearly) the same thing is in the main() function, as a return from...
What are the git concepts of HEAD, master, origin?
As I'm learning about git, I keep coming across the terms HEAD, master, origin, and I'm not sure what the differences are. If I understand correctly, HEAD is always equal to the latest revision? And if so, is that the latest revision of the whole repository, or of a specific branch or tag? This is s...
node.js hash string?
...
Take a look at crypto.createHash(algorithm)
var filename = process.argv[2];
var crypto = require('crypto');
var fs = require('fs');
var md5sum = crypto.createHash('md5');
var s = fs.ReadStream(filename);
s.on('data', function(d) {
md5sum.update(d);
});
s....
Sublime text 2 - find and replace globally ( all files and in all directories )
... in the search bar:
The first (show context) toggles context in result format (if enabled, some lines of text are shown before and after the matching line). The second allows to show the result in a new buffer, or in a console.
...
C++ where to initialize static const
...al types can be initialized here (*)...
static const int j; // ... OR in cpp.
};
foo.cpp
#include "foo.h"
const string foo::s = "foo string";
const char* foo::cs = "foo C string";
// No definition for i. (*)
const int foo::j = 4;
(*) According to the standards you must define i outside ...
Difference between GeoJSON and TopoJSON
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If you care about file size or topology, then use TopoJSON. If you don’t care about either, then use GeoJSON for simplicity’s sake.
The primary advantage of TopoJSON is size. By eliminating redundancy and using a more efficent fixed-precision integ...
How to check if running in Cygwin, Mac or Linux?
... Windows/Cygwin and Mac and Linux. It needs slightly different variables for each versions.
11 Answers
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Outputting data from unit test in python
... from a failed test, so I can examine it to help deduce what caused the error? I am aware of the ability to create a customized message, which can carry some information, but sometimes you might deal with more complex data, that can't easily be represented as a string.
...
Font size in CSS - % or em?
... setting the size of fonts in CSS, should I be using a percent value ( % ) or em ? Can you explain the advantage?
8 Answer...