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Ruby on Rails Callback, what is difference between :before_save and :before_create?

... You can use: before_save :generate_api_key, :if => :new_record? – Kasper Grubbe Nov 17 '13 at 22:09 add a comment ...
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Mipmap drawables for icons

...n access the drawable resources for the desired density. The actual mipmap API from 4.3. I haven't used this and am not familiar with it. It's not used by the Android Open Source Project launchers and I'm not aware of any other launcher using. ...
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Custom attributes - Yea or nay?

...="http://www.w3.org/1999/xhtml" xmlns:addthis="http://www.addthis.com/help/api-spec"> ... <a addthis:title="" addthis:url="" ...> Facebook (even tags) <html xmlns:og="http://opengraphprotocol.org/schema/" xmlns:fb="http://www.facebook.com/2008/fbml"> ... <fb:like href="http://de...
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Career day in kindergarten: how to demonstrate programming in 20 minutes? [closed]

...build "programs" that need to run alongside without crashing (Kind of like API programming.) It would need some additional incentive component - not to just do steps, but to reach some sort of goal. Maybe getting a flag in a grid of squares and bringing it to a different spot on the grid.... ...
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How do I install imagemagick with homebrew?

... this worked for me perfectly on mac os 10.11.1 El Capitan – otmezger Nov 9 '15 at 19:24 13 ...
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What is the difference between XMLHttpRequest, jQuery.ajax, jQuery.post, jQuery.get

...uery.ajax, which is a wrapper to XMLHttpRequest. XMLHttpRequest and Fetch API (experimental at this time) are the only in DOM, so should be the fastest. I saw a lot of information that is not accurate anymore, so I made a test page where anyone can test version from version which one is best at an...
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When is it acceptable to call GC.Collect?

...cts are currently referenced. I would rather have a garbage collection API when I could give it hints about this type of thing without having to force a GC my self. See also "Rico Mariani's Performance Tidbits" share ...
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How to change font face of Webview in Android?

... In my case , data is returning in the form of tags from ck editor(backend api) <div style=\"text-align: center;\"> <span style=\"background-color: transparent;\"> <font color=\"#f20505\" size=\"5\" face=\"Comic Sans MS\">Please share your feedback with us<\/font> <\/spa...
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How can you escape the @ character in javadoc?

...te it as an HTML entity: @ From the document "javadoc - The Java API Documentation Generator" If you want to start a line with the @ character and not have it be interpreted, use the HTML entity @. This implies that you can use HTML entities for any character that you would need to escap...
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What is &amp used for

...of characters. make: let linkGoogle = 'https://www.google.com/maps/dir/?api=1'; let origin = '&origin=' + locations[0][1] + ',' + locations[0][2]; aNav.href = linkGoogle + origin; share | ...