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Does SQLAlchemy have an equivalent of Django's get_or_create?
...odel, defaults=None, **kwargs):
instance = session.query(model).filter_by(**kwargs).first()
if instance:
return instance, False
else:
params = dict((k, v) for k, v in kwargs.iteritems() if not isinstance(v, ClauseElement))
params.update(defaults or {})
ins...
Why not use always android:configChanges=“keyboardHidden|orientation”?
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Quick Background
By default, when certain key configuration changes happen on Android (a common example is an orientation change), Android fully restarts the running Activity to help it adjust to such changes.
When you define android:configC...
When to use ' (or quote) in Lisp?
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Short answer
Bypass the default evaluation rules and do not evaluate the expression (symbol or s-exp), passing it along to the function exactly as typed.
Long Answer: The Default Evaluation Rule
When a regular (I'll come to that later) ...
When should one use a spinlock instead of mutex?
...il being woken up, which will be the case once the mutex is being unlocked by whatever thread was holding the lock before. When a thread tries to lock a spinlock and it does not succeed, it will continuously re-try locking it, until it finally succeeds; thus it will not allow another thread to take ...
How does git compute file hashes?
The SHA1 hashes stored in the tree objects (as returned by git ls-tree ) do not match the SHA1 hashes of the file content (as returned by sha1sum )
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How to find an element by matching exact text of the element in Capybara
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This could have been handled by writing click_link(link_text, :text => link_text)
– Remember Why You Started
Dec 13 '18 at 5:50
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Changing capitalization of filenames in Git
...14), a git mv will just work on a case insensitive OS.
See commit baa37bf by David Turner (dturner-tw).
mv: allow renaming to fix case on case insensitive filesystems
"git mv hello.txt Hello.txt" on a case insensitive filesystem always triggers "destination already exists" error, because these tw...
Push git commits & tags simultaneously
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Update August 2020
As mentioned originally in this answer by SoBeRich, and in my own answer, as of git 2.4.x
git push --atomic origin <branch name> <tag>
(Note: this actually work with HTTPS only with Git 2.24)
Update May 2015
As of git 2.4.1, you can do
git config --gl...
What does a Ajax call response like 'for (;;); { json data }' mean? [duplicate]
...ck that gained public attention with an attack on Gmail that was published by Jeremiah Grossman.
The idea is as simple as beautiful: A lot of users tend to be logged in permanently in Gmail or Facebook. So what you do is you set up a site and in your malicious site's Javascript you override the obj...
What is the difference between HTTP_HOST and SERVER_NAME in PHP?
...o ServerName is specified, then the server attempts to deduce the hostname by performing a reverse lookup on the IP address. If no port is specified in the ServerName, then the server will use the port from the incoming request. For optimal reliability and predictability, you should specify an expli...