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When to use a key/value store such as Redis instead/along side of a SQL database?
...dding-it-to-your-stack.html
I bet you'll have an aha! moment. ;)
A quote from a previous reader:
I've read about Redis before and heard how companies are using it, but never completely understood it's purpose. After reading this I can actually say I understand Redis now and how it's useful. Am...
Copy array by value
...rray();
const objectPrototype = new Object(); // or `new function () {}`
From these elements we can create three types of arrays.
// 1) Array of literal-values (boolean, number, string)
const type1 = [true, 1, "true"];
// 2) Array of literal-structures (array, object)
const type2 = [[], {}];
/...
What are copy elision and return value optimization?
...if copying/moving the object has side-effects.
The following example taken from Wikipedia:
struct C {
C() {}
C(const C&) { std::cout << "A copy was made.\n"; }
};
C f() {
return C();
}
int main() {
std::cout << "Hello World!\n";
C obj = f();
}
Depending on the compiler...
What is a Maven artifact?
...and libraries. A repository manager doesn't care where its artifacts come from (maybe they came from a Maven build, or a local file, or an Ant build, or a by-hand compilation...).
A Maven Artifact is a Java class that represents the kind of "name" that gets dereferenced by a repository manager int...
About Android image and asset sizes
...
How do you decide you have to start from a 48dip ? Say you only have a tablet (mdpi) at hand, do you start with a random size, and iterate until it looks "big enough" ?
– phtrivier
Jan 6 '15 at 11:13
...
Where should signal handlers live in a django project?
...aving a hard time figuring out where I should put them. The documentation from the django site has this to say:
7 Answers
...
Django CSRF check failing with an Ajax POST request
...:
https://docs.djangoproject.com/en/2.2/ref/csrf/
The working code, comes from this Django entry: http://www.djangoproject.com/weblog/2011/feb/08/security/
So the general solution is: "use ajaxSetup handler instead of ajaxSend handler". I don't know why it works. But it works for me :)
Previous p...
Postgres - FATAL: database files are incompatible with server
...
If you recently upgraded to 11 or 12 from 10.x you can run the below command to upgrade your postgres data directory retaining all data:
brew postgresql-upgrade-database
The above command is taken from the output of brew info postgres
...
What did MongoDB not being ACID compliant before v4 really mean?
...DB can only work against a single document.
If you need to remove an item from inventory and add it to someone's order at the same time - you can't. Unless those two things - inventory and orders - exist in the same document (which they probably do not).
I encountered this very same issue in an a...
Remove URL parameters without refreshing page
...tents)
to programmatically access the data through the stateObj then parse from the anchor
As I understood from your comment, you want to clean your URL without redirecting again.
Note that you cannot change the whole URL. You can just change what comes after the domain's name. This means that...