Add Generate and Edit Rails Migration to vim til.

README.md

@@ -18,6 +18,7 @@ I shamelessly stole this idea from
 
 ## vim
 
+- [Generate and Edit Rails Migration](vim/generate-and-edit-rails-migration.md)
 - [Head of File Name](vim/head-of-file-name.md)
 - [Preview Buffer](vim/previous-buffer.md)
 - [Quick File Info](quick-file-info.md)

vim/generate-and-edit-rails-migration.md

@@ -0,0 +1,15 @@
+# Generate and Edit Rails Migration
+
+Creating a new Rails migration has always involved two distinct steps for
+me. The first is to run `rails g migration CreateSomeTable` to create a
+migration file. The second is to copy and paste the migration's filename
+after `vi` to actually start editing it.
+
+[Rails.vim](https://github.com/tpope/vim-rails) collapses these steps into
+one:
+
+```
+:Rgenerate migration CreateSomeTable
+```
+
+[source](http://stackoverflow.com/questions/7857177/with-vim-rails-can-you-create-a-new-migration-file-and-open-it-in-one-go)