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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
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What is the best way to count “find” results?
My current solution would be find <expr> -exec printf '.' \; | wc -c , but this takes far too long when there are more than 10000 results. Is there no faster/better way to do this?
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How can I install MacVim on OS X?
I am using OS X 10.9.1 (Mavericks).
4 Answers
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POST request send json data java HttpUrlConnection
I have developed a java code that convert the following cURL to java code using URL and HttpUrlConnection.
the curl is :
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How to parameterize @Scheduled(fixedDelay) with Spring 3.0 expression language?
When using the Spring 3.0 capability to annotate a scheduled task, I would like to set the fixedDelay as parameter from my configuration file, instead of hard-wiring it into my task class, like currently...
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How do I increase the RAM and set up host-only networking in Vagrant?
I would like to increase the RAM to at least 1 GB and I would like to configure “Host-Only” networking to use "199.188.44.20".
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Clojure: cons (seq) vs. conj (list)
I know that cons returns a seq and conj returns a collection. I also know that conj "adds" the item to the optimal end of the collection, and cons always "adds" the item to the front. This example illustrates both of these points:
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The term 'Get-ADUser' is not recognized as the name of a cmdlet
I have used the following query to list the users in a windows 2008 server, but failed and got the below error.
6 Answers
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What are the differences between a UIView and a CALayer?
Both have most of the same attributes, both support different kind of animations, both represent different data.
What are the differences between a UIView and a CALayer?
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Does Dispose still get called when exception is thrown inside of a using statement?
...going to close and disposed when an exception is thrown if it is within a using statement?
3 Answers
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