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Rails “validates_uniqueness_of” Case Sensitivity
... If you do not have a database constraint, the insert will succeed and you now have two rows with 'foo' as the name.
See also "Concurrency and integrity" in the validates_uniqueness_of Rails documentation.
From Ruby on Rails 3rd Edition:
...despite its name, validates_uniqueness_of doesn’t ...
What is the difference between persist() and merge() in JPA and Hibernate?
...entity (updated) and a copy of this updated entity will return back. (from now on any changes should be made on this returned entity if you want to reflect your changes in persistence context)
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Bash history without line numbers
...irst that the history command was padding the line numbers with spaces and now the cut syntax makes more sense :) Thanks @Keith Thompson for your solution that will work for > 100k histories.
– cwd
Aug 18 '11 at 16:00
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How to query as GROUP BY in django?
...= ['designation']
results = QuerySet(query=query, model=Members)
You can now iterate over the results variable to retrieve your results. Note that group_by is not documented and may be changed in future version of Django.
And... why do you want to use group_by? If you don't use aggregation, you c...
How to convert array to SimpleXML
...xml = new SimpleXMLElement('<rootTag/>');
to_xml($xml, $my_array);
Now $xml contains a beautiful XML object based on your array exactly how you wrote it.
print $xml->asXML();
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im...
What is the purpose of double curly braces in React's JSX syntax?
...ing in Boulder? Lets grab coffee or lunch sometime... it would be good to know someone with the inside scoop on React since we're just starting a big project with it.
– B Robster
Mar 26 '14 at 23:52
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How do I compile C++ with Clang?
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I have the source code of Clang in front of my eyes now. During build (on Windows), it first builds clang.exe, and then copies that executable into clang++.exe. So it's the same executable, just at runtime it checks its own name to distinguish whether to behave as C or C++ com...
How to specify font attributes for all elements on an html web page?
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I know it's been 5 years, but I'm surprised nobody has noticed until now: you should never specify just a Windows font in "font-family" (unless of course it's a webfont) - Arial,helvetica,sans-serif is more compatible.
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What is the difference between re.search and re.match?
...e optional pos
argument regardless of whether a
newline precedes it.
Now, enough talk. Time to see some example code:
# example code:
string_with_newlines = """something
someotherthing"""
import re
print re.match('some', string_with_newlines) # matches
print re.match('someother',
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How to serialize a TimeSpan to XML
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The connect link is now broken, maybe it can be replaced with this one:connect.microsoft.com/VisualStudio/feedback/details/684819/… ? The technique also looks a little different...
– TJB
May 11 '15 at 23:...