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Rails: how do I validate that something is a boolean?

...age: validates :field, inclusion: { in: [ true, false ], message: "Please, select one!" } – tagaism Mar 23 '18 at 9:28  |  show 1 more comment...
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How to execute XPath one-liners from shell?

... You should try these tools : xmlstarlet : can edit, select, transform... Not installed by default, xpath1 xmllint : often installed by default with libxml2-utils, xpath1 (check my wrapper to have --xpath switch on very old releases and newlines delimited output (v < 2.9.9) ...
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Why should I capitalize my SQL keywords? [duplicate]

...ors. This said, while this convention is a good thing for DML/DDL such as SELECT/INSERT queries and such, it can make for heavy look of Procedural extensions to SQL as in stored procs. – mjv Dec 9 '09 at 4:34 ...
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How can I turn a List of Lists into a List in Java 8?

... .collect(Collectors.toList()) This is would be similar in SQL to having SELECT statements within SELECT statements. share | improve this answer | follow | ...
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Is there a way to use SVG as content in a pseudo element :before or :after

I want to place some SVG images before some selected elements. I am using jQuery but that is irrelevant. 8 Answers ...
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How to remove specific element from an array using python

... Thanks for pointing out that arrays aren't the same as lists. The selected answer doesn't work on arrays in 2.7. – EL_DON Feb 8 '17 at 18:37 add a comment ...
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HTTP GET with request body

...e available (on codeplex) managed component that doesn't even allow you to select text. – Evgeniy Berezovsky Sep 2 '11 at 14:10 6 ...
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How to clear MemoryCache?

...od The workaround is: List<string> cacheKeys = MemoryCache.Default.Select(kvp => kvp.Key).ToList(); foreach (string cacheKey in cacheKeys) { MemoryCache.Default.Remove(cacheKey); } share | ...
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TFS: How can you Undo Checkout of Unmodified files in a batch file

...containing' textbox "Tools.External" and assign a shortcut. For instance I selected Tools.ExternalCommand4 since my newly added undo command was the fourth one down. I then assigned shortcut keys Ctrl + Alt + U, Ctrl + Alt + U – Mario Feb 4 '13 at 22:52 ...
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This IP, site or mobile application is not authorized to use this API key

...nsole/ 2) In the Credentials, under Public API Access, Create New key 3) Select the server key from the option. 4) Enter your IP Address on the field and if you have more ip addresses, you can just add on every single line.NOTE: Enter the IP Address only when you want to use it for your testing p...