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Rails find record with zero has_many records associated [duplicate]
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Bah, found it here: https://stackoverflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
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Get value from hidden field using jQuery
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answered Jun 22 '10 at 8:18
SarfrazSarfraz
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Xcode Product -> Archive disabled
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1360
You've changed your scheme destination to a simulator instead of Generic iOS Device.
That's why...
Is returning by rvalue reference more efficient?
...O to omit doing a move or copy altogether. I recommend you to read BoostCon09 Rvalue References 101 which explains the matter, and how (N)RVO happens to interact with this.
Your case of returning an rvalue reference would be a good idea in other occasions. Imagine you have a getAB() function whic...
SQLite table constraint - unique on multiple columns
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answered Apr 23 '10 at 20:50
Ayman HouriehAyman Hourieh
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How to get first 5 characters from string [duplicate]
...F-16, etc.) use mb_substr:
// singlebyte strings
$result = substr($myStr, 0, 5);
// multibyte strings
$result = mb_substr($myStr, 0, 5);
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follo...
image.onload event and browser cache
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answered Sep 10 '12 at 15:41
Fabrício MattéFabrício Matté
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How to remove the lines which appear on file B from another file A?
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207
If the files are sorted (they are in your example):
comm -23 file1 file2
-23 suppresses the ...
How do you create optional arguments in php?
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jeremy
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answered Aug 29 '08 at 17:58
Jeff WinkworthJeff...
Rails 4: before_filter vs. before_action
In rails >4.0.0 generators creates CRUD operations with before_action not before_filter . It seems to do the same thing. So what's the difference between these two?
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