Rails Migration changing column to use Postgres arrays

Question

I am trying to change a column in my database so that it can use the Postgres array data type. Currently the table column is of type string.

I am using the following

Answer 1

def change

    change_column :table, :dummy_column, :string, array: true, default: '{}'

end

Notice:

it's specified as data type :string with array: true to default the column to an empty array ( [] ), you use default: '{}'