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Rails Migration: Remove constraint
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In Rails 4+ in order to remove not-null constraint, you can use change_column_null:
change_column_null :users, :address, true
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im...
How to compare two floating point numbers in Bash?
... then
echo "${FOO} > ${BAR}";
else
echo "${FOO} <= ${BAR}";
fi
Order of logical operators matters. Integer parts are compared as numbers and fractional parts are intentionally compared as strings. Variables are split into integer and fractional parts using this method.
Won't compare flo...
ssh: connect to host github.com port 22: Connection timed out
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I had to remove the .git from the url in order for this to work for me. url = github.com/username/repo
– Jesse Buss
Dec 21 '17 at 15:38
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Why does ConcurrentHashMap prevent null keys and values?
...re is other sorts of locking done. That's what makes it "Concurrent". In order to do that, it needs an Object to hang on.
– Paul Tomblin
Mar 30 '09 at 19:26
2
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How to get back to the latest commit after checking out a previous commit?
... listed first, local branches are listed last in alphabetically descending order, so the one remaining will be the alphabetically first branch name
Note:
This will always only use the (alphabetically) first branch name if there are multiple for that commit.
Anyway, I think the best solution wou...
Naming “class” and “id” HTML attributes - dashes vs. underlines [closed]
...selectors by any characters (including none at all) other than hyphens, in order to improve understanding and scannability.
/* Not recommended: does not separate the words “demo” and “image” */
.demoimage {}
/* Not recommended: uses underscore instead of hyphen */
.error_status {}
/* Reco...
throws Exception in finally blocks
...e close method will be called on each of these three resources in opposite order in which they were created. It means the close method would be called first for ResultSetm then the Statement and at the end for the Connection object.
It's also important to know that any exceptions that occur when th...
How to change a django QueryDict to Python Dict?
...licitly iterating the dictionary contents: dict(querydict.iterlists())
In order to retrieve a dictionary-like value that functions as the original, an inverse function uses QueryDict.setlist() to populate a new QueryDict value. In this case, I don't think the explicit iteration is avoidable.
My h...
Get current AUTO_INCREMENT value for any table
...A AND t.TABLE_NAME = c.TABLE_NAME)
WHERE
c.TABLE_SCHEMA = 'YOUR_SCHEMA'
ORDER BY
`Usage (%)` DESC;
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Completely uninstall PostgreSQL 9.0.4 from Mac OSX Lion?
... tanks again @JamesA. do i need to remove anything manually in order to be sure the slate is wiped completely clean? You can check my latest update with the output of "sudo find"
– Ramy
Nov 7 '11 at 15:26
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