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How to change a nullable column to not nullable in a Rails migration?
I created a date column in a previous migration and set it to be nullable. Now I want to change it to be not nullable. How do I go about doing this assuming there are null rows in that database? I'm ok with setting those columns to Time.now if they're currently null.
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Load multiple packages at once
How can I load a bunch of packages at once with out retyping the require command over and over? I've tried three approaches all of which crash and burn.
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How do I use a custom Serializer with Jackson?
I have two Java classes that I want to serialize to JSON using Jackson:
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How to send an email with Gmail as provider using Python?
I am trying to send email (Gmail) using python, but I am getting following error.
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Why is Thread.Sleep so harmful
I often see it mentioned that Thread.Sleep(); should not be used, but I can't understand why this is so. If Thread.Sleep(); can cause trouble, are there any alternative solutions with the same result that would be safe?
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'this' vs $scope in AngularJS controllers
In the "Create Components" section of AngularJS's homepage , there is this example:
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How to list the properties of a JavaScript object?
Say I create an object thus:
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Difference between int[] array and int array[]
I have recently been thinking about the difference between the two ways of defining an array:
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How do you Encrypt and Decrypt a PHP String?
What I mean is:
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How to pick an image from gallery (SD Card) for my app?
This question was originally asked for Android 1.6.
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