migration options

Does anyone know where I can find all the options for each migration type?

for example :limit => 30

where I could use like that:

t.string :name, :limit => 30

I’d like to know the options similar to :limit => 30

Thank you,

Rodrigo

http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/TableDefinition.html#method-i-column