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Add a new column to existing table in a migration

...ing migrations is also covered in the documentation. You should give it a more specific name, like "add_paid_to_users", this way it will not clash with your model clash. – Phill Sparks May 28 '13 at 12:55 ...
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What is in your Mathematica tool bag? [closed]

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Check if a given key already exists in a dictionary

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How do I use InputFilter to limit characters in an EditText in Android?

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Check for null in foreach loop

...he getter, this would be my own preferred since it expresses the intention more clearly by giving the operation a name (OrEmptyIfNull) The extension method mentioned above might make certain optimizations impossible for the optimizer to detect. Specifically, those that are related to IList using me...
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How to order results with findBy() in Doctrine

... edited Apr 15 '13 at 11:57 Tessmore 1,00488 silver badges2323 bronze badges answered Aug 21 '12 at 4:45 xdazz...
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How can I tell if one commit is a descendant of another commit?

... Possibly the fastest way would be to git checkout -b quickcheck <more-recent-commit-ID> and then git branch --contains <older-commit-ID> (and then git branch -D quickcheck to get rid of the temporary branch). – clee Jun 10 '10 at 20:23 ...
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How can I see what I am about to push with git?

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Chrome browser reload options new feature

...refresh button you get this tooltip saying: "Reload this page, hold to see more options" and when I do it I get these three awesome options. 1. Normal Reload 2. Hard Reload 3. Empty Cache and Hard Reload (this is very useful option I believe) ...
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What are sessions? How do they work?

...asd=lol&boo=no ) are both suitable ways to transport data between 2 or more request. However they are not good in case you don't want that data to be readable/editable on client side. The solution is to store that data server side, give it an "id", and let the client only know (and pass back at...