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How to determine if a record is just created or updated in after_save
The #new_record? function determines if a record has been saved. But it is always false in the after_save hook. Is there a way to determine whether the record is a newly created record or an old one from update?
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How to read a file in Groovy into a string?
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edited Oct 16 '14 at 14:44
answered Oct 11 '11 at 16:28
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Android: How to turn screen on and off programmatically?
Before marking this post as a "duplicate", I am writing this post because no other post holds the solution to the problem.
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Create unique constraint with null columns
I have a table with this layout:
4 Answers
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When is CRC more appropriate to use than MD5/SHA1?
When is it appropriate to use CRC for error detection versus more modern hashing functions such as MD5 or SHA1? Is the former easier to implement on embedded hardware?
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How do I restart nginx only after the configuration test was successful on Ubuntu?
...he service crashes when a nginx configuration file has errors. On a multi-site server this puts down all the sites, even the ones without configuration errors.
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Best way to create a simple python web service [closed]
I've been using python for years, but I have little experience with python web programming. I'd like to create a very simple web service that exposes some functionality from an existing python script for use within my company. It will likely return the results in csv. What's the quickest way to get ...
Difference between ApiController and Controller in ASP.NET MVC
I've been playing around with ASP.NET MVC 4 beta and I see two types of controllers now: ApiController and Controller .
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What does immutable mean?
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It means that once you instantiate the object, you can't change its properties. In your first alert you aren't changing foo. You're creating a new string. This is why in your second alert it will show "foo" instead of oo.
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Can we make unsigned byte in Java
... am receiving is unsigned and Java does not support unsigned byte, so when it reads the data it treats it as signed.
16 Ans...