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Mongod complains that there is no /data/db folder
..., e.g. sudo mkdir -p /data/db
Or you need to do su - to become superuser, and then create the directory with mkdir -p /data/db
Note:
MongoDB also has an option where you can create the data directory in another location, but that's generally not a good idea, because it just slightly complicate...
JavaScript null check
...argument, that argument is always declared even if its value is undefined, and so there won’t be any error. You are right about != null followed by !== undefined being useless, though.
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The located assembly's manifest definition does not match the assembly reference
...un some unit tests in a C# Windows Forms application (Visual Studio 2005), and I get the following error:
53 Answers
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Boolean vs boolean in Java
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Yes you can use Boolean/boolean instead.
First one is Object and second one is primitive type.
On first one, you will get more methods which will be useful.
Second one is cheap considering memory expense The second will save you a lot more memory, so go for it
Now choose your way....
How to exit from PostgreSQL command line utility: psql
What command or short key can I use to exit the PostgreSQL command line utility psql ?
9 Answers
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Google Gson - deserialize list object? (generic type)
...n<...>() {}.getType() captures a compile-time type (between the < and >) into a runtime java.lang.reflect.Type object. Unlike a Class object, which can only represent a raw (erased) type, the Type object can represent any type in the Java language, including a parameterized instantiation...
differentiate null=True, blank=True in django
...mines whether the field will be required in forms. This includes the admin and your custom forms. If blank=True then the field will not be required, whereas if it's False the field cannot be blank.
The combo of the two is so frequent because typically if you're going to allow a field to be blank in...
Update Item to Revision vs Revert to Revision
I've started to use Subversion with TortoiseSVN. If I open up the log and right click on an old revision I see two options that sound like they roll back to an older version: "Update item to revision" and "Revert to this revision".
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How many concurrent requests does a single Flask process receive?
I'm building an app with Flask, but I don't know much about WSGI and it's HTTP base, Werkzeug. When I start serving a Flask application with gunicorn and 4 worker processes, does this mean that I can handle 4 concurrent requests?
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What is a .pid file and what does it contain?
I recently come across a file with the extension .pid and explored inside it but didn't find much. The documentation says:
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