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Ternary Operator Similar To ?:
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We can combine How to define a ternary operator in Scala which preserves leading tokens? with the answer to Is Option wrapping a value a good pattern? to get
scala> "Hi".getClass.getSimpleName |> {x => x.endsWith("$") ? x.init | x}
res0: String = String
sca...
What is the session's “secret” option?
...you change it, but you should change it.
– Michael Mior
Sep 3 '12 at 2:29
1
@MichaelMior, how oft...
How can I know when an EditText loses focus?
...onFocusChange of setOnFocusChangeListener and there's a boolean parameter for hasFocus. When this is false, you've lost focus to another control.
EditText txtEdit = (EditText) findViewById(R.id.edittxt);
txtEdit.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
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How to add multiple objects to ManyToMany relationship at once in Django ?
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add(*[obj1, obj2, obj3])
Addendum:
Django does not call obj.save() for each item but uses bulk_create(), instead.
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View a file in a different Git branch without changing branches
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This should work:
git show branch:file
Where branch can be any ref (branch, tag, HEAD, ...) and file is the full path of the file. To export it you could use
git show branch:file > exported_file
You should also look at VonC's ans...
How to pipe input to a Bash while loop and preserve variables after loop ends
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The correct notation for Process Substitution is:
while read i; do echo $i; done < <(echo "$FILECONTENT")
The last value of i assigned in the loop is then available when the loop terminates.
An alternative is:
echo $FILECON...
Android: AutoCompleteTextView show suggestions when no text entered
...I want to show suggestions even if it has no text - but setThreshold(0) works exactly the same as setThreshold(1) - so the user has to enter at least 1 character to show the suggestions.
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How to apply a patch generated with git format-patch?
I have 2 git local repositories both pointing to the same remote repository.
6 Answers
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When saving, how can you check if a field has changed?
...verride the __init__ method of models.Model so that you keep a copy of the original value. This makes it so that you don't have to do another DB lookup (which is always a good thing).
class Person(models.Model):
name = models.CharField()
__original_name = None
def __init__(self, *arg...
Routes with Dash `-` Instead of Underscore `_` in Ruby on Rails
I want my urls to use dash - instead of underscore _ as word separators. For example controller/my-action instead of controller/my_action .
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