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Index on multiple columns in Ruby on Rails
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The order does matter in indexing.
Put the most selective field first, i.e. the field that narrows down the number of rows fastest.
The index will only be used insofar as you use its columns in sequence starting at the beginning. i.e. if you index on [:user_id, :article_id...
Relative paths in Python
...2).resolve()
In the future, it just that simple. :D
Moreover, we can select and check and copy/move those template files with pathlib:
if src_path != cwd:
# When we have different types of files in the `src_path`
for template_path in src_path.glob('*.ini'):
fname = template_pa...
How to parse JSON in Java
... JSON Generation through object serialisation
Support for collection type selection during parsing process
It can be used like this:
JsonParserFactory factory=JsonParserFactory.getInstance();
JSONParser parser=factory.newJsonParser();
Map jsonMap=parser.parseJson(jsonString);
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How do I safely pass objects, especially STL objects, to and from a DLL?
...ply specific packing. The compiler will still apply default packing if you select a pack value bigger than the one the compiler would have chosen, so if you pick a large packing value, a class can still have different packing between compilers. The solution for this is to use #pragma pack(1), which ...
How to use ? : if statements with Razor and inline code blocks
... should work:
<span class="vote-up@(puzzle.UserVote == VoteType.Up ? "-selected" : "")">Vote Up</span>
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How can I apply styles to multiple classes at once?
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although the selected answer is completely correct we can not guarantee that newbies will understand what it is doing. I would go with the one explained more. Since it is more of "how to fish" instead of "here is the fish".
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Entity Framework - Add Navigation Property Manually
...also make sure that you get your Primary Key definition right (right click select related fields, mark them as EntityKey in the properties). Otherwise you might get 'Multiplicity is not valid in Role in relationship Because the Dependent Role refers to the key properties...'
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UML class diagram enum
...using ArgoEclipse or ArgoUML, there's a pulldown menu on the toolbar which selects among Datatype, Enumeration, Signal, etc that will allow you to create your own Enumerations. The compartment that normally contains Attributes can then be populated with EnumerationLiterals for the values of your en...
How accurate is python's time.sleep()?
...ailable), and sleep() will
accept a time with a nonzero fraction
(Unix select is used to implement
this, where available).
And more specifically w.r.t. sleep():
Suspend execution for the given number
of seconds. The argument may be a
floating point number to indicate a
more precise...
How can I get selector from jQuery object
Is there an easy way to get selector from $(this) ? There is a way to select an element by its selector, but what about getting the selector from element ?
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