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Difference between Destroy and Delete
...llbacks on the model while delete doesn't.
From the Rails API:
ActiveRecord::Persistence.delete
Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can't be persisted). Returns the frozen instance.
The row is simply removed w...
What are unit tests, integration tests, smoke tests, and regression tests?
...n tests? What are the differences between them and which tools can I use for each of them?
17 Answers
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Converting Secret Key into a String and Vice Versa
I am generating a key and need to store it in DB, so I convert it into a String, but to get back the key from the String. What are the possible ways of accomplishing this?
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Best practices for API versioning? [closed]
Are there any known how-tos or best practices for web service REST API versioning?
7 Answers
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Cache Invalidation — Is there a General Solution?
...gh then you either:
accept that you sometime operate with out of date information and do not always check b
do your level best to make checking b as fast as possible
You cannot have your cake and eat it...
If you can layer an additional cache based on a over the top then this affects the initia...
json.dumps vs flask.jsonify
...t that already has the appropriate content-type header 'application/json' for use with json responses. Whereas, the json.dumps() method will just return an encoded string, which would require manually adding the MIME type header.
See more about the jsonify() function here for full reference.
Edit:...
What is the difference between JDK and JRE?
...new programs.
The JDK is the Java Development Kit, the full-featured SDK for Java. It has everything the JRE has, but also the compiler (javac) and tools (like javadoc and jdb). It is capable of creating and compiling programs.
Usually, if you only care about running Java programs on computer you ...
Why in C++ do we use DWORD rather than unsigned int? [duplicate]
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DWORD is not a C++ type, it's defined in <windows.h>.
The reason is that DWORD has a specific range and format Windows functions rely on, so if you require that specific range use that type. (Or as they say "When in Rome...
When should I use RequestFactory vs GWT-RPC?
...gure out if I should migrate my gwt-rpc calls to the new GWT2.1 RequestFactory cals.
8 Answers
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How to initialize a two-dimensional array in Python?
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A pattern that often came up in Python was
bar = []
for item in some_iterable:
bar.append(SOME EXPRESSION)
which helped motivate the introduction of list comprehensions, which convert that snippet to
bar = [SOME EXPRESSION for item in some_iterable]
which is shorter an...