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How do I get the object if it exists, or None if it does not exist?
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From django docs
get() raises a DoesNotExist exception if an object is not found for the given parameters. This exception is also an attribute of the model class. The DoesNotExist exception inherits from django.core.exce...
How do I get the key at a specific index from a Dictionary in Swift?
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From https://developer.apple.com/library/prerelease/ios/documentation/swift/conceptual/swift_programming_language/CollectionTypes.html:
If you need to use a dictionary’s keys or values with an API that takes an Array insta...
Java8: Why is it forbidden to define a default method for a method from java.lang.Object
...concludes that to get reference equality, all he need do is inherit equals from Object. Then, next week, the library maintainer for Bar "helpfully" adds a default equals implementation. Ooops! Now the semantics of Foo have been broken by an interface in another maintenance domain "helpfully" addi...
Rails: where does the infamous “current_user” come from?
... that there are a lot of references to current_user . Does this only come from Devise? and do I have to manually define it myself even if I use Devise? Are there prerequisites to using current_user (like the existence of sessions, users, etc)?
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Invert “if” statement to reduce nesting
...iredAmount();
return normalPayAmount();
};
I've picked this code from the refactoring catalog. This specific refactoring is called: Replace Nested Conditional with Guard Clauses.
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When is it appropriate to use C# partial classes?
...nting interfaces in C#, and keeping the interface members clearly seperate from the class-members: stackoverflow.com/questions/3601901/why-use-partial-classes/…
– STW
Aug 30 '10 at 21:14
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What did MongoDB not being ACID compliant before v4 really mean?
...DB can only work against a single document.
If you need to remove an item from inventory and add it to someone's order at the same time - you can't. Unless those two things - inventory and orders - exist in the same document (which they probably do not).
I encountered this very same issue in an a...
How does SSL really work?
...ing (#2 above).
But what if an adversary could modify packets sent to and from the server, and what if that adversary modified the certificate you were presented with and inserted their own public key or changed any other important details? If that happened, the adversary could intercept and modify...
Custom domain for GitHub project pages
...c are not clear or linear.
Step 1: Enable GitHub pages in GitHub settings
From your repo, click on the tab
Scroll down to the GitHub Pages section. You have two options:
Choosing master branch will treat /README.md as your web index.html. Choosing master branch /docs folder will treat /docs/REA...
Delete everything in a MongoDB database
...very single collection, and whatever else might be lying around, and start from scratch. Is there a single line of code that will let me do this? Bonus points for giving both a MongoDB console method and a MongoDB Ruby driver method.
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