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Django migration strategy for renaming a model and relationship fields
...go 2.0 if you change your model name, the ./manage.py makemigrations myapp command will ask you if you renamed your model. E.g.: Did you rename the myapp.Foo model to Bar? [y/N] If you answer 'y' your migration will contain the migration.RenameModel('Foo', 'Bar') Same counts for the renamed fields ...
delegate keyword vs. lambda notation
Once it is compiled, is there a difference between:
6 Answers
6
...
Is it safe to resolve a promise multiple times?
... Here's a JSBin illustrating that all of above is actually true: jsbin.com/gemepay/3/edit?js,console Only the first resolve is ever used.
– konrad
Feb 9 '17 at 8:47
4
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New self vs. new static
...the first method, whereas static is bound to the called class (also see get_called_class()).
class A {
public static function get_self() {
return new self();
}
public static function get_static() {
return new static();
}
}
class B extends A {}
echo get_class(B::ge...
Run a string as a command within a Bash script
I have a Bash script that builds a string to run as a command
8 Answers
8
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How to change a table name using an SQL query?
...
Use sp_rename:
EXEC sp_rename 'Stu_Table', 'Stu_Table_10'
You can find documentation on this procedure on MSDN.
If you need to include a schema name, this can only be included in the first parameter (that is, this cannot be use...
warning this call is not awaited, execution of the current method continues
... edited May 23 '17 at 11:47
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answered Feb 15 '13 at 22:03
Nikolay KhilNikolay...
UILabel sizeToFit doesn't work with autolayout ios6
...s = [NSLayoutConstraint constraintsWithVisualFormat:@"|-8-[descriptionLabel_]-8-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(descriptionLabel_)];
[self addConstraints:constrs];
[self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-8-[descriptionLabel_]" options:...
Swift: declare an empty dictionary
...hat an array is always declared as var as I suggested you: developer.apple.com/library/prerelease/ios/documentation/Swift/…
– damirstuhec
Jun 4 '14 at 11:06
1
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Copy a file in a sane, safe and efficient way
...lems because I was using it to copy HDF5 files that were many GB in size.
http://man7.org/linux/man-pages/man2/sendfile.2.html
sendfile() will transfer at most 0x7ffff000 (2,147,479,552) bytes,
returning the number of bytes actually transferred. (This is true on
both 32-bit and 64-bit syst...