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Many-to-many relationship with the same model in rails?
...o use, which is to copy what 'Community Engine' did.
You can refer to:
https://github.com/bborn/communityengine/blob/master/app/models/friendship.rb
and
https://github.com/bborn/communityengine/blob/master/app/models/user.rb
for more information.
TL;DR
# user.rb
has_many :friendships, :fore...
Namespace + functions versus static methods on a class
... online reference to this principle in an article from Herb Sutter: http://www.gotw.ca/gotw/084.htm
The important thing to know is that: In C++ functions in the same namespace as a class belong to that class' interface (because ADL will search those functions when resolving function calls).
Namesp...
What to learn for making Java web applications in Java EE 6? [closed]
... you want to learn Hibernate get "Hibernate Made Easy" by Cameron McKenzie(www.hiberbook.com). It is worth every penny. You can finish reading that book in 2 days(literally). it is like a novel and at the end you find yourself dealing with Hibernate like a Semi-Pro.
...
Cooler ASCII Spinners? [closed]
...⠄⡀⢀⠠⠐⠈ The entire braille block, even in random order http://www.fileformat.info/info/unicode/block/braille_patterns/images.htm
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财务计算器拓展：复利计算、平均值、中位数、众数、方差计算 - App Invento...
... cumulative probability of a standard normal distribution.
来源：https://community.kodular.io/t/f ... or-extension/240189
Counting the number of option tags in a select tag in jQuery
....size());
console.log($('#input1 option').length);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<select data-attr="dropdown" id="input1">
<option value="Male" id="Male">Male</option>
<option value="Female" id...
Do any JVM's JIT compilers generate code that uses vectorized floating point instructions?
... could write OpenCl kernel to do the computing and run it from java http://www.jocl.org/.
Code can be run on CPU and/or GPU and OpenCL language supports also vector types so you should be able to take explicitly advantage of e.g. SSE3/4 instructions.
...
Formula to determine brightness of RGB color
...ce (relative)
0.2126 * R + 0.7152 * G + 0.0722 * B
2nd picture - http://www.w3.org/TR/AERT#color-contrast
0.299 * R + 0.587 * G + 0.114 * B
3rd picture - HSP Color Model
sqrt(0.299 * R^2 + 0.587 * G^2 + 0.114 * B^2)
4th picture - WCAG 2.0 SC 1.4.3 relative luminance and contrast ratio form...
Is there a good JavaScript minifier? [closed]
...
Use HTTPS instead
– PYK
Sep 15 at 7:48
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Android Studio could not find any version that matches com.android.support:appcompat-v7:+
...
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
}
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