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How to rollback a specific migration?
...on, use: (This corrected command was added AFTER all the comments pointing out the error in the original post)
rake db:migrate VERSION=20100905201547
In order to rollback ONLY ONE specific migration (OUT OF ORDER) use:
rake db:migrate:down VERSION=20100905201547
Note that this will NOT rollbac...
Hash String via SHA-256 in Java
...m to find any good examples of what I want to do. Can anybody here help me out?
9 Answers
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Does Internet Explorer 8 support HTML 5?
...my form validation but did not work. Is there any link where we could find out more about how to get it working?
– Helen Neely
Oct 1 '11 at 12:13
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Parser Error Message: Could not load type 'TestMvcApplication.MvcApplication'
...ther answers worked for me. I fixed my error by changing the web project's output path. I had had it set to bin\debug but the web project doesn't work unless the output path is set to simply "bin"
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How to clear jQuery validation error messages?
... must implement a manual resetting jumping into the inspector and figuring out what classes are applying on errors
– Nestor Colt
Jan 18 '18 at 14:23
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Code signing certificate for open-source projects?
... should encrypt the reply.* The way to encrypt varies by email client. For Outlook, ensure you have an email certificate (freely available), and turn on encryption.
Within a day or so, you should receive an email with a link to collect your certificate. You have to open the link from the same comput...
Should the folders in a solution match the namespace?
... (me) and a team of developers.
I found the simplest and most productive route was to have a single namespace per project and all classes go into that namespace. You are then free to put the class files into whatever project folders you want. There is no messing about adding using statements at the...
How can I pass a list as a command-line argument with argparse?
...get_kwargs():
if value is not None:
print(value)
Here is the output you can expect:
$ python arg.py --default 1234 2345 3456 4567
...
arg.py: error: unrecognized arguments: 2345 3456 4567
$ python arg.py --list-type 1234 2345 3456 4567
...
arg.py: error: unrecognized arguments: 2345 ...
Sorted collection in Java
...he JDK just for the purpose of having a sorted list. It is named (somewhat out of order with the other Sorted* interfaces) "java.util.PriorityQueue". It can sort either Comparable<?>s or using a Comparator.
The difference with a List sorted using Collections.sort(...) is that this will mainta...
Determining if an Object is of primitive type
...ced by o is Integer (due to auto-boxing).
It sounds like you need to find out whether the type is a "wrapper for primitive". I don't think there's anything built into the standard libraries for this, but it's easy to code up:
import java.util.*;
public class Test
{
public static void main(Str...