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Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
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answered Feb 15 '12 at 0:25
Dan WichDan Wich
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Margin while printing html page
...iour, the user must select 'Print preview' and then set the print size to 100% (default is Shrink To Fit).
A better option for full control on printed margins is to use the @page directive to set the paper margin, which will affect the margin on paper outside the html body element, which is normal...
What does tilde-greater-than (~>) mean in Ruby gem dependencies? [duplicate]
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It means "equal to or greater than in the last digit", so e.g. ~> 2.3 means
"equal to 2.3 or...
JavaScript moving element in the DOM
...$('div').eq(2));
$('div').eq(1).insertBefore('div:first');
}, 3000 );
});
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Swapping two variable value without using third variable
...mory locations (rather than different values). This is because (p xor p) = 0 and if both x and y share the same memory location, when one is set to 0, both are set to 0.
When both *x and *y are 0, all other xor operations on *x and *y will equal 0 (as they are the same), which means that the functio...
How can I do a line break (line continuation) in Python?
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10 Answers
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C/C++ NaN constant (literal)?
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answered May 22 '13 at 12:07
Mike SeymourMike Seymour
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How to change max_allowed_packet size
...line under [mysqld] or [client] section in your file:
max_allowed_packet=500M
then restart the MySQL service and you are done.
See the documentation for further information.
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Is it safe to remove selected keys from map within a range loop?
... one iteration to the next. If the map is nil, the number of iterations is 0.
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How to declare a friend assembly?
...:
[assembly:InternalsVisibleTo("Google.ProtocolBuffers.Test,PublicKey="+
"00240000048000009400000006020000002400005253413100040000010001008179f2dd31a648"+
"2a2359dbe33e53701167a888e7c369a9ae3210b64f93861d8a7d286447e58bc167e3d99483beda"+
"72f738140072bb69990bc4f98a21365de2c105e848974a3d210e938b0a561...