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Rails migration: t.references with alternative name?

...ly in Rails 5): t.references :transferable_as, index: true, foreign_key: {to_table: :courses} t.references :same_as, index: true, foreign_key: {to_table: :courses} share | improve this answer ...
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Creating folders inside a GitHub repository without using Git

I want to add a new folder to my newly created GitHub repository without installing the Git setup for (Mac, Linux, and Windows). Is it possible to do so? ...
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Getting Django admin url for an object

Before Django 1.0 there was an easy way to get the admin url of an object, and I had written a small filter that I'd use like this: <a href="{{ object|admin_url }}" .... > ... </a> ...
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Using “Object.create” instead of “new”

...t let you see the real benefits of Object.create. This methods allows you to easily implement differential inheritance, where objects can directly inherit from other objects. On your userB example, I don't think that your init method should be public or even exist, if you call again this method on...
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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]

... The best way is to check the type, because undefined/null/false are a tricky thing in JS. So: if(typeof obj !== "undefined") { // obj is a valid variable, do something here. } Note that typeof always returns a string, and doesn't gene...
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How to select/get drop down option in Selenium 2

I am converting my selenium 1 code to selenium 2 and can't find any easy way to select a label in a drop down menu or get the selected value of a drop down. Do you know how to do that in Selenium 2? ...
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How to make a variadic macro (variable number of arguments)

I want to write a macro in C that accepts any number of parameters, not a specific number 5 Answers ...
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ASP.NET MVC - Find Absolute Path to the App_Data folder from Controller

What is the correct way to find the absolute path to the App_Data folder from a Controller in an ASP.NET MVC project? I'd like to be able to temporarily work with an .xml file and I don't want to hardcode the path. ...
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Does use of final keyword in Java improve the performance?

...eeps track of whether the method has actually been overridden, and is able to perform optimizations such as inlining on the assumption that a method hasn't been overridden - until it loads a class which overrides the method, at which point it can undo (or partially undo) those optimizations. (Of co...
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Using node.js as a simple web server

I want to run a very simple HTTP server. Every GET request to example.com should get index.html served to it but as a regular HTML page (i.e., same experience as when you read normal web pages). ...