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Best Practice - NSError domains and codes for your own project/app
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I personally use a reverse-DNS style domain. For example:
NSError * myInternalError = [NSError errorWithDomain:@"com.davedelong.myproject" code:42 userInfo:someUserInfo];
The third part of the domain (@"myproject") is just used t...
Rails migration: t.references with alternative name?
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You can do this all in the initial migration/column definition (at least currently in Rails 5):
t.references :transferable_as, index: true, foreign_key: {to_table: :courses}
t.references :same_as, index: true, foreign_key: {to_table: :cours...
Removing duplicate rows in vi?
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this hightlights all the duplicate lines for me but doesn't delete, am I missing a step here?
– ak85
Sep 14 '12 at 23:57
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Window appears off screen on ubuntu [closed]
...): go to Appearance, Behavior, and then check / uncheck Enable workspaces. All windows magically appear!
– Roman Susi
Nov 8 '16 at 15:16
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Getting exact error type in from DbValidationException
...ity.Validation.DbEntityValidationResult} which gives me no information at all about what field it was unable to initialize.
Is there a way to get more info about this error?
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Why is document.body null in my javascript?
...body hasn't been defined at this point yet. In general, you want to create all elements before you execute javascript that uses these elements. In this case you have some javascript in the head section that uses body. Not cool.
You want to wrap this code in a window.onload handler or place it after...
How is mime type of an uploaded file determined by browser?
...dden), and then if not found there, we defer to the system registry.
// Finally, we scan a secondary hard-coded list to catch types that we can
// deduce but that we also want to allow the OS to override.
The hard-coded lists come a bit earlier in the file: https://cs.chromium.org/chromium/src/net/...
Difference between namespace in C# and package in Java
...n java you have to import a class, not a package. It IS possible to import all classes in a package with an import package.* but that too imports the classes, not the package.
– Imus
May 23 '18 at 7:54
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using awk with column value conditions
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All awk implementations support both "==" and "~".
– Ed Morton
Feb 7 '13 at 5:00
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How to show line number when executing bash script
...ly executing.
If you need to know the line number where the function was called, try $BASH_LINENO. Note that this variable is an array.
For example:
#!/bin/bash
function log() {
echo "LINENO: ${LINENO}"
echo "BASH_LINENO: ${BASH_LINENO[*]}"
}
function foo() {
log "$@"
}
foo ...