Ruby on Rails

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Here's a multi-line block format migration method:

    create_table :friendly_id_slugs do |t|
      t.string   :slug,           :null => false
      t.integer  :sluggable_id,   :null => false
      t.string   :sluggable_type, :limit => 50
      t.string   :scope
      t.datetime :created_at
    end

So you have the method create_table(), which is sent one to two arguments: the table name to be created, and a hash of options, and then optionally passed a block with the details of the table. "t" is the name you gave the block, just the same as "something" in my example. The name itself is not significant, but off of that block hangs the rest of the details for create_table to use when making your table. If you don't pass the block, then the table is created without any columns.