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find vs find_by vs where
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Use whichever one you feel suits your needs best.
The find method is usually used to retrieve a row by ID:
Model.find(1)
It's worth noting that find will throw an exception if the item is not found by the attribute that you supply. Us...
Filter dict to contain only certain keys?
...ested in a select few of them. Is there an easy way to prune all the other ones out?
15 Answers
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How do I empty an array in JavaScript?
...o say. b holds a reference to the old array even after a is assigned a new one. c and d continue to reference the same array. The difference in outputs is therefore expected.
– shovavnik
Aug 17 '14 at 8:03
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How to resolve merge conflicts in Git?
...er comment:
The command
doesn't necessarily open a GUI unless you install one. Running git mergetool for me resulted in vimdiff being used. You can install
one of the following tools to use it instead: meld, opendiff,
kdiff3, tkdiff, xxdiff, tortoisemerge, gvimdiff, diffuse,
ecmerge, p4merge, araxi...
Finding all cycles in a directed graph
... page in my search and since cycles are not same as strongly connected components, I kept on searching and finally, I found an efficient algorithm which lists all (elementary) cycles of a directed graph. It is from Donald B. Johnson and the paper can be found in the following link:
http://www.cs.tu...
How do I tell Matplotlib to create a second (new) plot, then later plot on the old one?
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But how can one change the label and axis limits with this approach. If I use ax1.ylabel it says that it is not found. Same with fig1.ylabel ...
– George Datseris
Aug 28 '16 at 7:45
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Mediator Vs Observer Object-Oriented Design Patterns
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The Observer pattern:
Defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
The Mediator pattern:
Define an object that encapsulates how a set of objects interact...
How do I get ruby to print a full backtrace instead of a truncated one?
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You could also do this if you'd like a simple one-liner:
puts caller
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jQuery callback on image load (even when the image is cached)
...hecking and triggering the event based off .complete, like this:
$("img").one("load", function() {
// do stuff
}).each(function() {
if(this.complete) {
$(this).load(); // For jQuery < 3.0
// $(this).trigger('load'); // For jQuery >= 3.0
}
});
Note the change from .bind()...
What is the pythonic way to detect the last element in a 'for' loop?
...hat should be called only between elements, being suppressed in the last one.
24 Answers
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