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How to fix “containing working copy admin area is missing” in SVN?
I deleted manually a directory I just added, offline, in my repository. I can't restore the directory.
21 Answers
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Oracle SQL Query for listing all Schemas in a DB
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SELECT username FROM all_users ORDER BY username;
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What is the difference between association, aggregation and composition?
...eans there is almost always a link between objects (they are associated).
Order object has a Customer object
public class Order {
private Customer customer
}
Aggregation (has-a + whole-part)
Special kind of association where there is whole-part relation between two objects. they might live w...
Create singleton using GCD's dispatch_once in Objective-C
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@WalterMartinVargas-Pena the strong reference is held by the static variable
– Dave DeLong
Nov 15 '13 at 0:42
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Determine what attributes were changed in Rails after_save callback?
I'm setting up an after_save callback in my model observer to send a notification only if the model's published attribute was changed from false to true. Since methods such as changed? are only useful before the model is saved, the way I'm currently (and unsuccessfully) trying to do so is as fol...
Mongoose query where value is not null
...o list the profiles where user ref is not null (because I already filtered by rol during the population), but
after googleing a few hours I cannot figure out how to get this. I
have this query:
const profiles = await Profile.find({ user: {$exists: true, $ne: null }})
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How to check whether dynamically attached event listener exists or not?
...ere is my problem: is it possible somehow to check for existence of dynamically attached event listener? Or how can I check the status of the "onclick" (?) property in DOM? I have searched internet just like Stack Overflow for a solution, but no luck. Here is my html:
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Why does git perform fast-forward merges by default?
...-lived branches.
To me, a short-lived branch is one that I create in order to make a certain operation easier (rebasing, likely, or quick patching and testing), and then immediately delete once I'm done.
That means it likely should be absorbed into the topic branch it forked from, and the to...
JavaScript: filter() for Objects
...rible things will happen to your code. Things will break. You're extending all object types, including object literals.
Here's a quick example you can try:
// Extend Object.prototype
Object.prototype.extended = "I'm everywhere!";
// See the result
alert( {}.extended ); // "I'm ev...
How to set a Django model field's default value to a function call / callable (e.g., a date relative
... to create a field in the class.
PRE Django 1.7
Django lets you pass a callable as the default, and it will invoke it each time, just as you want:
from datetime import datetime, timedelta
class MyModel(models.Model):
# default to 1 day from now
my_date = models.DateTimeField(default=lambda: ...