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All Ruby tests raising: undefined method `authenticate' for nil:NilClass

Most of my tests are raising the following and I don't understand why. All methods call raise the 'authenticate' error. I've checked the code if there was a method called "authenticate" but there is no such method. ...
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How to link godaddy domain with AWS Elastic Beanstalk environment?

...to create a CNAME or do any forwarding - this is bad from the point of SEO and not recommended by Amazon. Even you should not point a record to IP directly - it will cause a lot of troubles in the future because IP can be changed any moment. The most elegant way is to migrate DNS service from GoDad...
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CSS Background Opacity [duplicate]

... Children inherit opacity. It'd be weird and inconvenient if they didn't. You can use a translucent PNG file for your background image, or use an RGBa (a for alpha) color for your background color. Example, 50% faded black background: <div style="backgroun...
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Disable same origin policy in Chrome

... Close chrome (or chromium) and restart with the --disable-web-security argument. I just tested this and verified that I can access the contents of an iframe with src="http://google.com" embedded in a page served from "localhost" (tested under chromium ...
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Remove folder and its contents from git/GitHub's history

I was working on a repository on my GitHub account and this is a problem I stumbled upon. 8 Answers ...
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How to specify an element after which to wrap in css flexbox? [duplicate]

I don't think this is part of the flexbox standard yet, but is there maybe a trick to suggest or force wrapping after a certain element? I'd like to respond to different page sizes and wrap a list differently without extra markup, so that rather than having (for example) orphaned menu items on the n...
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Google Play app description formatting

I've made an Android application that is available on Google Play. Now I want to add some more formatting to my app description (eg. indent, links, lists..). But I cannot find any website where possible formatting is listed. Google Help pages cannot help me either on this subject. There exists a lot...
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static function in C

...ogy to use here? Wouldn't object file be more accurate? From what I understand, a static function is hidden from the linker and the linker does not operate on translation units. – Steven Eckhoff Feb 13 '14 at 18:32 ...
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Add a tooltip to a div

... @RayL It isn't standard behavior for a tooltip to be clickable - this blurs links and tooltips, preventing the user from knowing whether a highlighted word will 1) give them more information or 2) take them to another page entirely. In genera...
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ListView item background via custom selector

... I've been frustrated by this myself and finally solved it. As Romain Guy hinted to, there's another state, "android:state_selected", that you must use. Use a state drawable for the background of your list item, and use a different state drawable for listSelecto...