I\'m new to Ruby on Rails and so far, I\'m having a lot of fun learning it. Coming from the .NET world, it\'s been quite a switch as my IDE (Visual Studio 2008) sort of hand
Try Netbeans Ruby Edition. It's not quite as nice as RubyMine but it has built-in svn support and similar templates to TextMate. I like it, but then again, I also haven't released the project I'm developing yet so I can't speak much to productivity.
Just remember that the open source world is about choice, so there are tons of IDEs. A popular one is Eclipse that should include rails development as a plugin (and they are very simple to install). Netbeans also supports rails IIRC.
Maybe it is time to get down and dirty with basic component tools, and then find an IDE. I always find when starting a new language that it helps to understand the raw toolchain and how things work before automating.
Personally, unless it is Java development (convoluted in itself) I stay away from traditional IDES and use a modular solution of Vim/Gedit/Makefiles and other automations.
GEdit on Linux/Gnome is a great compromise. You have a basic text-editor with syntax highlighting and a terminal embedded. Then you can add in plugins for auto-completion and class browsing if you want that.
Good Luck
When I learned on Ubuntu, I used gedit. I tried to make it like TextMate using different add-ons.
I liked having to use the terminal while I was learning as it helps you to understand all the aspects of the build process. Using a heavy-duty IDE like RubyMine or Eclipse might hide all that and therefore limit your understanding of what is going on "under the covers". Usually this lack of knowledge will pose problems as you get into developing more complex applications.
In my opinion, SVN support is sort of unnecessary in an IDE. It's pretty easy just to open up the terminal to manage your repository, or to use some GUI tool like Tortoise.
I think the only real benefit to using an IDE like RubyMine would be the auto/code-completion functionality. I too am a big fan of ReSharper (used it for C# development) and I would have loved to have some tool like it when I was learning Rails- but doesn't TextMate have support for auto/code-completion?
I would say don't jump into using and RubyMine for at least several months, or even a year, if ever. The extra work that you have to do will pay off in the long run. Stick with TextMate.
Disclaimer: I have only used ruby for a very short period of time. But I do believe that my experience as a .NET developer learning other languages is valuable to you.
I'm going to disagree with most people here and say go with the IDE. An IDE is there to make your life easier, not harder. I know that coming from a .NET background autocompletion is how I learn languages. I don't read documentation. I see what my IDE suggests and I see what it does.
I really wouldn't worry too much about not knowing the full details of what goes on on the background, you will figure it out when you need to. In the meantime you will have quite enough to be getting on with learning the ins and outs of the language. You need all the help you can get, if you have written .NET in the past then an IDE will be an enourmous help.
I'm going to take a different stance than the others here. I think for most issues you'll spend a great deal of time poking your head in dark corners just trying to learn the basics when you don't use an IDE. They make your life easier and in most cases actually teach you about the software platform you're using. The code suggestions, automatic formatting, integrated help, etc. help you discover the features of the language much faster than say Notepad.
It is definitely important to know the tool chain but I prefer to examine it as I learn from the IDE. See how and why the IDE chose to do something the way it did. In many cases the IDE will use the best practices and/or most popular practices which you can learn a lot from.
I would use the basics to start (terminal and a simple text editor) until you really get a good understanding of Ruby on Rails. Then once you have that basic underlying knowledge of the framework move to an IDE.
In my opinion if you want to learn use the terminal and an editor, but if you want to be productive use an IDE.
At home I use the basic setup since I am in the process of learning Ruby on Rails. However, at work, where I am a Java developer, I use an IDE. Using the IDE allows me not worry about the small tedious tasks and just worry about programming. Having tools like auto-completion, integrated svn, and integrated debugging tools increases my productivity.
[edit] Also, I don't think the particular IDE matters. They all have the similar functionality. Whatever your the most comfortable with is the best.