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how to generate migration to make references polymorphic
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As far as I know, there's no built-in generator for polymorphic associations. Generate a blank migration and then modify it by hand according to your needs.
Update:
You'll need to specify which table you're changing. According to this S...
How do I check if a file exists in Java?
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Using java.io.File:
File f = new File(filePathString);
if(f.exists() && !f.isDirectory()) {
// do something
}
share
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improve this answer
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Get last n lines of a file, similar to tail
...f the file
while lines_to_go > 0 and block_end_byte > 0:
if (block_end_byte - BLOCK_SIZE > 0):
# read the last block we haven't yet read
f.seek(block_number*BLOCK_SIZE, 2)
blocks.append(f.read(BLOCK_SIZE))
else:
# file too ...
MySQL Orderby a number, Nulls last
... as well? I tried applied it to varchar fields, but the order seems to be different than from using either ASC or DESC.
– Sumit Desai
Feb 4 '14 at 7:41
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Can functions be passed as parameters?
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If I understand your question correctly, I think you're looking for a func that returns a func, see here where I replace a hardcoded "quote123" function with a "quote" function that achieves the same result after you pass it ...
Get controller and action name from within controller?
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If you're going to do this (provide the action and controller name), why not just assign them directly???
– MetalPhoenix
Apr 3 '15 at 19:16
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Samples of Scala and Java code where Scala code looks simpler/has fewer lines?
...firstName, lastName);
}
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
Person person = (Person) o;
if (firstName != null ? !firstName.equ...
What is the difference between SessionState and ViewState?
What is the difference between SessionState and ViewState in ASP.NET?
5 Answers
5
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How to deselect a selected UITableView cell?
...ll.
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
Swift 3.0:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//Change the selected background view of the cell.
tableView.deselectRow(at: indexPath, animated: true)
}
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Why is extending native objects a bad practice?
... that this kind of stuff causes all kinds of terrible bugs in javascript.
If you need custom behaviour, it is far better to define your own class (perhaps a subclass) instead of changing a native one. That way you will not break anything at all.
The ability to change how a class works without subc...