I discovered application templates today, and I've been banging my head 
against the wall for an hour now about generating a one-line migration. 

g = Rails::Generators::Base.new
g.extend Rails::Generators::Migration
g.instance_variable_set(:@source_paths, [File.expand_path(File.dirname(
__FILE__))])

g.migration_template "migrations/enable_uuid.rb", 
"db/migrate/enable_uuid.rb"


Seems to me like there should be an easy API endpoint about generating 
migrations. (I would've used the generator, but my migration doesn't fit 
the generator invocation, it's about enabling a DB extension)

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