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How to change a nullable column to not nullable in a Rails migration?
I created a date column in a previous migration and set it to be nullable. Now I want to change it to be not nullable. How do I go about doing this assuming there are null rows in that database? I'm ok with setting those columns to Time.now if they're currently null.
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Inserting code in this LaTeX document with indentation
...color{dkgreen},
stringstyle=\color{mauve},
breaklines=true,
breakatwhitespace=true,
tabsize=3
}
You can change default language in the middle of document with \lstset{language=Java}.
Example of usage in the document:
\begin{lstlisting}
// Hello.java
import javax.swing.JApplet;
import jav...
The type initializer for 'MyClass' threw an exception
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Check the InnerException property of the TypeInitializationException; it is likely to contain information about the underlying problem, and exactly where it occurred.
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Error “The goal you specified requires a project to execute but there is no POM in this directory” a
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This link helped: https://stackoverflow.com/a/11199865/1307104
I edit my command by adding quotes for every parameter like this:
mvn install:install-file "-DgroupId=org.mozilla" "-DartifactId=jss" "-Dversion=4.2.5" "-Dpackaging=jar" "-Dfile=C:\Users\AArmijos\workspace\componentes-1.0.4\deps\...
How to respond with HTTP 400 error in a Spring MVC @ResponseBody method returning String?
I'm using Spring MVC for a simple JSON API, with @ResponseBody based approach like the following. (I already have a service layer producing JSON directly.)
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How to get GET (query string) variables in Express.js on Node.js?
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In Express it's already done for you and you can simply use req.query for that:
var id = req.query.id; // $_GET["id"]
Otherwise, in NodeJS, you can access req.url and the builtin url module to url.parse it manually:
var url = require('...
Replace whole line containing a string using Sed
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edited Nov 30 '18 at 0:25
answered Jun 28 '12 at 13:15
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How to create a sub array from another array in Java?
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edited Jan 7 '17 at 10:43
Flow
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Reading my own Jar's Manifest
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You can do one of two things:
Call getResources() and iterate through the returned collection of URLs, reading them as manifests until you find yours:
Enumeration<URL> resources = getClass().getClassLoader()
.getResources("META-INF/MANIFEST.MF");
while (resources.hasMor...
convert_tz returns null
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edited Sep 16 at 14:17
answered Jan 22 '13 at 8:37
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