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Django filter versus get for single object?
...rhead to a return. For a simplified proof you can look at this.
2 This is what Django is doing in the backend. get calls filter and raises an exception if no item is found or if more than one object is found.
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Reset Entity-Framework Migrations
...ing tables in the database as EF wants to create the tables from scratch.
What to do:
Delete existing migrations from Migrations_History table.
Delete existing migrations from the Migrations Folder.
Run add-migration Reset. This will create a migration in your Migration folder that includes crea...
See what process is using a file in Mac OS X
... I spent 2 minutes Googling and found your answer here.
$ lsof | grep [whatever]
Where [whatever] is replaced with the filename you're looking for.
With this, you can see which program is desperately holding onto your
about-to-be-trashed file. Once you exit that program, your trash will...
Check whether variable is number or string in JavaScript
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what's wrong with function is_number(n) { return /^-?[\d.]+(?:e-?\d+)?$/.test(n);}
– OneOfOne
Sep 29 '13 at 20:08
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Reducing memory usage of .NET applications?
What are some tips to reduce the memory usage of .NET applications? Consider the following simple C# program.
9 Answers
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How to recursively delete an entire directory with PowerShell 2.0?
What is the simplest way to forcefully delete a directory and all its subdirectories in PowerShell? I am using PowerShell V2 in Windows 7.
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jQuery 'input' event
... I just googled 'js input event'. There is a knack for knowing what terms to use to find what you want on google; it comes with experience. And then, of course, google records everything and uses it to learn what you actually want. Most of my searches are for API docs and programming que...
Properties file in python (similar to Java Properties)
...tension is still .properties, but I had to add a section header similar to what you see in .ini files... a bit of a bastardization, but it works.
The python file: PythonPropertyReader.py
#!/usr/bin/python
import ConfigParser
config = ConfigParser.RawConfigParser()
config.read('ConfigFile.prope...
What is the JSF resource library for and how should it be used?
...t> and <h:graphicImage> components have a library attribute. What is this and how should this be used? There are a lot of examples on the web which use it as follows with the common content/file type css , js and img (or image ) as library name depending on the tag used:
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For each row in an R dataframe
... Be careful, as the dataframe is converted to a matrix, and what you end up with (x) is a vector. This is why the above example has to use numeric indexes; the by() approach gives you a data.frame, which makes your code more robust.
– Darren Cook
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