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How can I rename a database column in a Ruby on Rails migration?
...cord::Migration
def up
add_column :table, :correct_name_column_one, :string
add_column :table, :correct_name_column_two, :string
puts 'Updating correctly named columns'
execute "UPDATE table_name SET correct_name_column_one = old_name_column_one, correct_name_column_two = old_name...
How to generate JAXB classes from XSD?
....w3._2005.atom.FeedType;
public class Demo {
public static void main(String[] args) throws Exception {
JAXBContext jc = JAXBContext.newInstance("org.w3._2005.atom");
Unmarshaller unmarshaller = jc.createUnmarshaller();
URL url = new URL("http://bdoughan.blogspot.com/at...
What is the best way to give a C# auto-property an initial value?
...st()
{
var db = DefaultValueBool;
var ds = DefaultValueString;
var di = DefaultValueInt;
}
[System.ComponentModel.DefaultValue(true)]
public bool DefaultValueBool { get; set; }
[System.ComponentModel.DefaultValue("Good")]
public string DefaultValueS...
C/C++ macro string concatenation
...
If they're both strings you can just do:
#define STR3 STR1 STR2
The preprocessor automatically concatenates adjacent strings.
EDIT:
As noted below, it's not the preprocessor but the compiler that does the concatenation.
...
How to overload __init__ method based on argument type?
...ou to do with the datatype it gave you. The problem with isinstance(x, basestring) is that there is no way for the caller to tell you, for instance, that even though the type is not a basestring, you should treat it as a string (and not another sequence.) And perhaps the caller would like to use the...
How to modify a global variable within a function in bash?
...
Thanks for the point, but I have to return an string array, and within the function I have to add elements to two global string arrays.
– harrison4
May 9 '14 at 13:00
...
How to avoid null checking in Java?
...dition> is a boolean expression and <object> is an object whose toString() method's output will be included in the error.
An assert statement throws an Error (AssertionError) if the condition is not true. By default, Java ignores assertions. You can enable assertions by passing the optio...
Single Page Application: advantages and disadvantages [closed]
...can authenticate). This approach maps directly to a more traditional query string, the difference is merely in the execution. With HTML5 pushState() you can eliminate the #hash and use completely classic URLs which can resolve on the server on the first request and then load via ajax on subsequent ...
Finding what methods a Python object has
...lp(dir) output on your Python Shell:
dir(...)
dir([object]) -> list of strings
If called without an argument, return the names in the current scope.
Else, return an alphabetized list of names comprising (some of) the attributes of the given object, and of attributes reachable from it.
If the ...
Difference between path.normalize and path.resolve in Node.js
....normalize can handle any paths you might want to normalize and means only string manipulation of the path, while path.resolve will use the filesystem and current directory to resolve the path to an absolute path. This makes them behave quite different as path.normalize might be used on a path insid...