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Run a callback only if an attribute has changed in Rails

...5.7307 4.9328 45.2525 4.66231 44.6595 4.66231C43.6264 4.66231 43.1481 5.28821 43.1481 6.59048V11.9512C43.1481 13.2535 43.6264 13.8962 44.6595 13.8962C45.6924 13.8962 46.1709 13.2535 46.1709 11.9512V9.17788Z\"/\u003e\u003cpath d=\"M32.492 10.1419C32.492 12.6954 34.1182 14.0484 37.0451 14.0484C39.9723...
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Private vs Public in Cache-Control

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Remove leading or trailing spaces in an entire column of data

... hydrox467hydrox467 1,65511 gold badge1212 silver badges1515 bronze badges 7 ...
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Python memory usage of numpy arrays

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Serialize an object to XML

...itkevicius 46.1k2323 gold badges200200 silver badges211211 bronze badges answered Nov 8 '10 at 12:05 RameshVelRameshVel 58.4k2525 ...
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The difference between try/catch/throw and try/catch(e)/throw e

... answered Nov 8 '09 at 17:21 Otávio DécioOtávio Décio 68.9k1414 gold badges152152 silver badges219219 bronze badges ...
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How do I strip non alphanumeric characters from a string and keep spaces?

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Can I have an IF block in DOS batch file?

... answered Feb 13 '11 at 10:21 Cody Gray♦Cody Gray 215k4040 gold badges447447 silver badges523523 bronze badges ...
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Xcode 4 - “Archive” is greyed out?

...nceptual/Xcode4UserGuide/DistApps/DistApps.html#//apple_ref/doc/uid/TP40010215-CH11-DontLinkElementID_69 But I still can't get the actual archives to show up in Organizer (even though the files exist) share | ...
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What does SQL clause “GROUP BY 1” mean?

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