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Does MongoDB's $in clause guarantee order
...by the selected index order as shown.
If you need to preserve this order, then you basically have two options.
So let's say that you were matching on the values of _id in your documents with an array that is going to be passed in to the $in as [ 4, 2, 8 ].
Approach using Aggregate
var list =...
Print newline in PHP in single quotes
... yessir. He answered it in under 10 min. I had to wait till then to accept, then I forgot about it haha.
– Matt
Mar 28 '10 at 7:46
1
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How do I pass a variable by reference?
...= something_to_do_with_the_old_string(the_string)
return new_string
# then you could call it like
my_string = return_a_whole_new_string(my_string)
If you really wanted to avoid using a return value, you could create a class to hold your value and pass it into the function or use an existing c...
Is an HTTPS query string secure?
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Then why is that OAuth2 specification isn't recommend to send sensitive data in query parameters (in the URL) ? Even though it's recommend to use TLS (HTTPS) always. Refer to the last point in tools.ietf.org/html/draft-ietf-o...
How to configure postgresql for the first time?
...:
sudo -u postgres psql template1
Set the password for user postgres, then exit psql (Ctrl-D):
ALTER USER postgres with encrypted password 'xxxxxxx';
Edit the pg_hba.conf file:
sudo vim /etc/postgresql/9.1/main/pg_hba.conf
and change "peer" to "md5" on the line concerning postgres:
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How to safely upgrade an Amazon EC2 instance from t1.micro to large? [closed]
...my experience, the way I do it is create a snapshot of your current image, then once its done you'll see it as an option when launching new instances. Simply launch it as a large instance at that point.
This is my approach if I do not want any downtime(i.e. production server) because this solution...
Python dictionary from an object's fields
..., depending on what you want to do, it might be nice to inherit from dict. Then your class is already a dictionary, and if you want you can override getattr and/or setattr to call through and set the dict. For example:
class Foo(dict):
def __init__(self):
pass
def __getattr__(self, ...
Check if database exists in PostgreSQL using shell
... a conditional:
if psql -lqt | cut -d \| -f 1 | grep -qw <db_name>; then
# database exists
# $? is 0
else
# ruh-roh
# $? is 1
fi
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In vim, how do I go back to where I was before a search?
Programming in vim I often go search for something, yank it, then go back to where I was, insert it, modify it.
7 Answers
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How do I directly modify a Google Chrome Extension File? (.CRX)
...learn how to write an extension yourself, or modify it for your own needs.
Then you can pack it back up with Chrome’s internal tools which automatically create the file back into CRX. Installing it just requires a click.
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