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mongodb: insert if not exists
... specify what data you want to write:
data = {"$set":{"key2":"value2"}}
Now your selected document will update the value of "key2" only and leave everything else untouched.
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Changing Ctrl + Tab behavior for moving between documents in Visual Studio
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This is the best answer now for visual studio 2010. This was very helpful. The accepted macro solution is inferior to this one.
– jmq
Mar 1 '11 at 21:19
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How does JavaScript .prototype work?
... really got my head around this prototype-based programming, does any one know how this works?
26 Answers
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What are some methods to debug Javascript inside of a UIWebView?
... why something with Javascript isn't working inside of a UIWebView. To my knowledge, there is no way to set a breakpoint inside of XCode for a js file. No problemo, I'll just go back to 2004 and use alert statemen-- oh wait they don't seem to work inside of a UIWebView either!
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Best way to create unique token in Rails?
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-- Update --
As of January 9th, 2015. the solution is now implemented in Rails 5 ActiveRecord's secure token implementation.
-- Rails 4 & 3 --
Just for future reference, creating safe random token and ensuring it's uniqueness for the model (when using Ruby 1.9 and ActiveR...
Memoization in Haskell?
...u can check the work so far by verifying that toList nats gives you [0..]
Now,
f_tree :: Tree Int
f_tree = fmap (f fastest_f) nats
fastest_f :: Int -> Int
fastest_f = index f_tree
works just like with list above, but instead of taking linear time to find each node, can chase it down in loga...
Why use pip over easy_install? [closed]
...Roseman is not). Here's the current state of things:
Binary packages are now distributed as wheels (.whl files)—not just on PyPI, but in third-party repositories like Christoph Gohlke's Extension Packages for Windows. pip can handle wheels; easy_install cannot.
Virtual environments (which come b...
Show current state of Jenkins build on GitHub repo
... Set build status on GitHub commit to the post-build steps
That's it. Now do a test build and go to GitHub repository to see if it worked. Click on Branches in the main repository page to see build statuses.
You should see green checkmarks:
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How to find what code is run by a button or element in Chrome using Developer Tools
...glement of minified code:
(click to zoom)
3. Find the glorious code!
Now, the trick here is to not get carried away pressing the key, and keep an eye out on the screen.
Press the F11 key (Step In) until desired source code appears
Source code finally reached
In the jsFiddle sample provided...
MySQL Query - Records between Today and Last 30 Days
...ery will not select the today's records.
In this case, you'll need to use NOW instead:
SELECT DATE_FORMAT(create_date, '%m/%d/%Y')
FROM mytable
WHERE create_date BETWEEN NOW() - INTERVAL 30 DAY AND NOW()
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