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How to get equal width of input and select fields
... the form, I have one select and two input fields. These elements are vertically aligned. Unfortunately, I can't get equal width of these elements.
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Understanding :source option of has_one/has_many through of Rails
... you want to use for an association on the model isn't the same as the assocation on the :through model, you can use :source to specify it.
I don't think the above paragraph is much clearer than the one in the docs, so here's an example. Let's assume we have three models, Pet, Dog and Dog::Breed.
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Different results with Java's digest versus external utilities
...ave written a simple Java class to generate the hash values of the Windows Calculator file. I am using Windows 7 Professional with SP1 . I have tried Java 6.0.29 and Java 7.0.03 . Can someone tell me why I am getting different hash values from Java versus (many!) external utilities and/or web...
How does MongoDB sort records when no sort order is specified?
...es not mandate predictability outside of an explicit sort() or the special case of fixed-sized capped collections which have associated usage restrictions. For typical workloads it is desirable for the storage engine to try to reuse available preallocated space and make decisions about how to most e...
Bash if statement with multiple conditions throws an error
I'm trying to write a script that will check two error flags, and in case one flag (or both) are changed it'll echo-- error happened. My script:
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Difference between HEAD and master
...hen push to this.
Here is a visual example:
On your own repository you can check where the HEAD is pointing to by running this:
$ git symbolic-ref HEAD
refs/heads/master
However, finding out where the remotes/origin/HEAD is pointing to is more tricky because it is on the remote machine.
Ther...
What is the difference between Caching and Memoization?
I would like to know what the actual difference between caching and memoization is.
As I see it, both involve avoiding repeated function calls to get data by storing it .
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How can I extract a good quality JPEG image from a video file with ffmpeg?
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Use -qscale:v to control quality
Use -qscale:v (or the alias -q:v) as an output option.
Normal range for JPEG is 2-31 with 31 being the worst quality.
The scale is linear with double the qscale being roughly half the bitrate.
Recom...
How do I use vi keys in ipython under *nix?
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In case someone's wandering in here recently, IPython 5.0 switched from readline to prompt_toolkit, so an updated answer to this question is to pass an option:
$ ipython --TerminalInteractiveShell.editing_mode=vi
... or to se...
What does each of the [y,n,q,a,d,/,K,j,J,g,e,?] stand for in context of git -p
...g tree file and asks you if you want to stage the change of each hunk. You can select one of the following options and type return:
y - stage this hunk
n - do not stage this hunk
q - quit; do not stage this hunk nor any of the remaining ones
a - stage thi...