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How do you make a deep copy of an object?
It's a bit difficult to implement a deep object copy function. What steps you take to ensure the original object and the cloned one share no reference?
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XML Serialization - Disable rendering root element of array
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Note you must also replace [XmlArray] if present.
– dbc
Jun 27 '19 at 19:22
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No output to console from a WPF application?
...o; }
}
/// <summary>
/// Creates a new console instance if the process is not attached to a console already.
/// </summary>
public static void Show()
{
//#if DEBUG
if (!HasConsole)
{
AllocConsole();
InvalidateOutAnd...
Is it possible to create a multi-line string variable in a Makefile
...tricky part is getting your multi-line variable back out of the makefile. If you just do the obvious thing of using "echo $(ANNOUNCE_BODY)", you'll see the result that others have posted here -- the shell tries to handle the second and subsequent lines of the variable as commands themselves.
Howev...
What exactly does a jar file contain?
...ary formats - but the class file is compiled code instead of source code.
If you either open the jar file with a zip utility or run jar xf foo.jar you can extract the files from it, and have a look at them. Note that you don't need a jar file to run Java code - classloaders can load class data dire...
How to convert an Array to a Set in Java
...T> mySet = new HashSet<>(Arrays.asList(someArray));
In Java 9+, if unmodifiable set is ok:
Set<T> mySet = Set.of(someArray);
In Java 10+, the generic type parameter can be inferred from the arrays component type:
var mySet = Set.of(someArray);
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Save image from URL by paperclip
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If you need to use update_attributes rename picture_from_url to picture_url=(value) for example.
– Daniel Rikowski
Jun 2 '13 at 13:07
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Python 2.7: Print to File
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If you want to use the print function in Python 2, you have to import from __future__:
from __future__ import print_function
But you can have the same effect without using the function, too:
print >>f1, 'This is a t...
Slide right to left?
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The only trouble is that if there is content inside, it "squashes" it horizontally, causing controls to move about/resize/wrap etc. Is there a good solution for that?
– Neil Barnwell
May 15 '17 at 22:51
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Rails: select unique values from a column
...ts. Not plain ratings. And from uniq's point of view, they are completely different. You can use this:
Model.select(:rating).map(&:rating).uniq
or this (most efficient)
Model.uniq.pluck(:rating)
# rails 5+
Model.distinct.pluck(:rating)
Update
Apparently, as of rails 5.0.0.1, it works onl...