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Combine two ActiveRecord::Relation objects
...solution for me.
Instead of searching for right method creating an union from these two sets, I focused on algebra of sets. You can do it in different way using De Morgan's law
ActiveRecord provides merge method (AND) and also you can use not method or none_of (NOT).
search.where.none_of(search...
Divide a number by 3 without using *, /, +, -, % operators
.../ 3 = a/4 + a/16 + a/64 + (..). Dividing by 4 is where the bit shift comes from. The last check on num==3 is needed because we've only got integers to work with.
– Yorick Sijsling
Jul 30 '12 at 12:40
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File path to resource in our war/WEB-INF folder?
...lder of my app engine project. I read in the FAQs that you can read a file from there in a servlet context. I don't know how to form the path to the resource though:
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Handling a colon in an element ID in a CSS selector [duplicate]
...tion are incorrect. You need to escape both the underscore (to prevent IE6 from ignoring the rule altogether in some edge cases) and the colon character for the selector to work properly across different browsers.
Technically, the colon character can be escaped as \:, but that doesn’t work in IE ...
Padding is invalid and cannot be removed?
...zation vector are used for encoding and decoding, this issue does not come from data decoding but from data encoding.
After you called Write method on a CryptoStream object, you must ALWAYS call FlushFinalBlock method before Close method.
MSDN documentation on CryptoStream.FlushFinalBlock meth...
What does !! mean in ruby?
... thing that is it used for legitimately is preventing a huge chunk of data from being returned. For example you probably don't want to return 3MB of image data in your has_image? method, or you may not want to return your entire user object in the logged_in? method. Using !! converts these objects...
Get current directory name (without full path) in a Bash script
...variable; all built-in variable names are in all-caps (to distinguish them from local variables, which should always have at least one lower-case character). result=${PWD#*/} does not evaluate to /full/path/to/directory; instead, it strips only the first element, making it path/to/directory; using t...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...40,947,991,047,334,197,581,225,628,107,021,573... hope that helps someones from getting angry at their hex conversion.
– EmpathicSage
May 13 '16 at 20:17
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Good Hash Function for Strings
...collisions. But if I SHA-256 the string value and then generate a hashcode from the digested string, the collision ratio is less than 0.0001%. Thanks!
– benjismith
Nov 18 '10 at 18:54
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Return a “NULL” object if search result not found
...ava, if I had class with a 'search' method that would return an object T from a Collection< T > that matched a specific parameter, I would return that object and if the object was not found in the collection, I would return null . Then in my calling function I would just check if(tResult...