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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
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What is the best way to count “find” results?
...ull lines :
$ time find -type f | wc -l
8
real 0m0.006s
user 0m0.003s
sys 0m0.000s
So my solution is faster =) (the important part is the real line)
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python requests file upload
...http://example.com', files=files).prepare().body.decode('ascii'))
--c226ce13d09842658ffbd31e0563c6bd
Content-Disposition: form-data; name="upload_file"; filename="file.txt"
--c226ce13d09842658ffbd31e0563c6bd--
Note the filename="file.txt" parameter.
You can use a tuple for the files mapping val...
Retrieving the last record in each group - MySQL
...erflow August data dump. I'll use that for benchmarking. There are 1,114,357 rows in the Posts table. This is running on MySQL 5.0.75 on my Macbook Pro 2.40GHz.
I'll write a query to find the most recent post for a given user ID (mine).
First using the technique shown by @Eric with the GROUP BY...
XSD: What is the difference between xs:integer and xs:int?
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What is the precise meaning of “ours” and “theirs” in git?
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I suspect you're confused here because it's fundamentally confusing. To make things worse, th...
Move window between tmux clients
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DIG mbl
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answered Jun 26 '10 at 10:54
mb14mb14
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jQuery Event : Detect changes to the html/text of a div
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edited Apr 4 at 14:32
Community♦
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answered Apr 30 '13 at 4:41
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How to solve “The specified service has been marked for deletion” error
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answered Dec 13 '13 at 11:23
Arseni MourzenkoArseni Mourzenko
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Reverse a string in Python
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edited Feb 25 '14 at 2:13
Mokolodi1
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answered May 31 '09 at 2:11
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