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How to listen for changes to a MongoDB collection?
...tricks. The key here is the oplog.
When you run MongoDB in a Replica Set, all of the MongoDB actions are logged to an operations log (known as the oplog). The oplog is basically just a running list of the modifications made to the data. Replicas Sets function by listening to changes on this oplog a...
How to redirect 404 errors to a page in ExpressJS?
...:
https://github.com/visionmedia/express/blob/master/examples/error-pages/index.js
So it is actually this part:
// "app.router" positions our routes
// above the middleware defined below,
// this means that Express will attempt
// to match & call routes _before_ continuing
// on, at which poi...
How to post pictures to instagram using API
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@usama unfortunately not officially but I've heard rumours that if you go on to their website and scale it down to mobile view you can. Not tried it myself though
– Albzi
Jul 2 '17 at 13:16
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Difference between id and name attributes in HTML
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To put it very informally, id is what your frontend (CSS, JS) works with, while name is what your server receives and can then process. This is basically what Greeso's answer says.
– Saraph
Dec 6 '16 at 8:15...
How can you find and replace text in a file using the Windows command-line environment?
... comes with PowerShell built-in. Here is the script I used to find/replace all instances of text in a file:
powershell -Command "(gc myFile.txt) -replace 'foo', 'bar' | Out-File -encoding ASCII myFile.txt"
To explain it:
powershell starts up powershell.exe, which is included in Windows 7
-Command ...
What do Clustered and Non clustered index actually mean?
...pplication programmer. I want to know about Clustered and Non clustered indexes .
I googled and what I found was :
11 An...
Download file from web in Python 3
...download_and_keep_on_memory(URL('http://statics.591.com.tw/tools/showPhone.php?info_data=rLsGZe4U%2FbphHOimi2PT%2FhxTPqI&type=rLEFMu4XrrpgEw'),
headers, # You may need this. Otherwise, some websites will send the 404 error to you.
...
Method overloading in Objective-C?
...that method overloading is not supported in Objective-C. It is similar to PHP in that sense. As he also points out, it is common practice to define two or more methods with different signatures in the manner he examples. However, it is also possible to create one method using the "id" type. Via ...
Application not picking up .css file (flask/python)
...ollows:
app_folder/ flask_app.py/ static/ style.css/ templates/
index.html
(Please note that 'static' and 'templates' are folders, which should be named exactly the same thing.)
To check what version of flask you are running, you should open Python in terminal and type the following ac...
Fat models and skinny controllers sounds like creating God models [closed]
...ontrollers approach, esp. the Rails camp. As a result the routers is basically just figuring out what method to call on what controller and all the controller method does is call the corresponding method on the model and then bring up the view. So I've two concerns here which I don't understand:
...