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How to change a nullable column to not nullable in a Rails migration?
...umn => Time.now}, {:date_column => nil}). The query in your original form just made all my models have nil value in the field.
– dimitarvp
Aug 1 '12 at 12:16
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What is the 'instanceof' operator used for in Java?
...not sure what they are. Let's say you've got a collection of controls on a form. You want to read the checked state of whatever checkboxes are there, but you can't ask a plain old object for its checked state. Instead, you'd see if each object is a checkbox, and if it is, cast it to a checkbox and c...
javascript: Clear all timeouts?
...h is not required by specification). Althrough the starting number differs form browser to browser. It seems that Opera, Safari, Chrome and IE > 8 starts timeout ids from 1, Gecko-based browsers from 2 and IE <= 8 from some random number that is magically saved across tab refresh. You can disc...
Make Vim show ALL white spaces as a character
...sual, to understand how listchars works, use the help. It provides great information about what chars can be displayed (like trailing space, for instance) and how to do it:
:help listchars
It might be helpful to add a toggle to it so you can see the changes mid editing easily (source: VIM :set li...
How to get the last day of the month?
...ll:
>>> from calendar import monthrange
>>> monthrange(2012, 2)
(2, 29)
My previous answer still works, but is clearly suboptimal.
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How can I calculate the time between 2 Dates in typescript
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Use the getTime method to get the time in total milliseconds since 1970-01-01, and subtract those:
var time = new Date().getTime() - new Date("2013-02-20T12:01:04.753Z").getTime();
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What is stdClass in PHP?
...for booleans will be extremely old, probably written before standards were formed. Let's be honest, PHP was originally written as a complete mess without any standards (see the wide range of variable/function/object naming conventions used). I've honestly never seen any PHP code where the developer ...
Is PHP compiled or interpreted?
... to produce bytecode for processing by the Zend Engine, giving improved performance over its interpreter predecessor.
– kiranvj
Jul 28 '12 at 16:17
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How do I check if file exists in jQuery or pure JavaScript?
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its some more details on the non-jQuery form which can be helpful
– tim peterson
Jul 2 '13 at 14:12
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How can I calculate the difference between two dates?
How can I calculate the days between 1 Jan 2010 and (for example) 3 Feb 2010?
9 Answers
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