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TransactionManagementError “You can't execute queries until the end of the 'atomic' block” while usi
...ransactionManagementError when trying to save a Django User model instance and in its post_save signal, I'm saving some models that have the user as the foreign key.
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How to get the IP address of the server on which my C# application is running on?
I am running a server, and I want to display my own IP address.
26 Answers
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svn cleanup: sqlite: database disk image is malformed
... do a svn cleanup because I can't commit the changes in my working copy, and I got the following error:
17 Answers
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Least common multiple for 3 or more numbers
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Given a function f and a list l = [a,b,c,d], reduce(f,l) returns f(f(f(a,b),c),d). It's the functional implementation of "lcm can be computed by iteratively computing the lcm of the current value and the next element of the list."
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How can I know if a branch has been already merged into master?
...this applies to only the local branches. The -a flag will show both local and remote branches, and the -r flag shows only the remote branches.
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Why are variables “i” and “j” used for counters?
...ation notation traditionally uses i for the first index, j for the second, and so on. Example (from http://en.wikipedia.org/wiki/Summation):
It's also used that way for collections of things, like if you have a bunch of variables x1, x2, ... xn, then an arbitrary one will be known as xi.
As...
Turning multi-line string into single comma-separated
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You can use awk and sed:
awk -vORS=, '{ print $2 }' file.txt | sed 's/,$/\n/'
Or if you want to use a pipe:
echo "data" | awk -vORS=, '{ print $2 }' | sed 's/,$/\n/'
To break it down:
awk is great at handling data broken down into fi...
Classes vs. Modules in VB.NET
...C# static classes. When your class is designed solely for helper functions and extension methods and you don't want to allow inheritance and instantiation, you use a Module.
By the way, using Module is not really subjective and it's not deprecated. Indeed you must use a Module when it's appropriate...
How can javascript upload a blob?
...n(data) {
console.log(data);
});
You need to use the FormData API and set the jQuery.ajax's processData and contentType to false.
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Create and append dynamically
...id='block'> you've created. You just need to create another <div> and call appendChild().
// Your existing code unmodified...
var iDiv = document.createElement('div');
iDiv.id = 'block';
iDiv.className = 'block';
document.getElementsByTagName('body')[0].appendChild(iDiv);
// Now create an...