Rails 3 Model attribute type mapping to table columns

How does the attribute types in a Rails model get mapped to the table columns in case the table already exists. e.g., for this table

CREATE TABLE feedback (
    idx NUMBER NOT NULL,
    locale CHAR(20) NOT NULL,
    category VARCHAR(30),
    store VARCHAR(30),
    node VARCHAR(20),
    sort VARCHAR(30),
    page VARCHAR(30),
    vote CHAR(1),
    flag CHAR(1),
    date_val CHAR(10),
    time_val CHAR(8),
    keyword VARCHAR(256),
    url VARCHAR(4000),
    rsp VARCHAR(4000),
    PRIMARY KEY(idx),
);

and this model

class Feedback < ActiveRecord::Base
    self.table_name = 'feedback'

    set_primary_key :idx

    attr_accessible :idx, :locale, :category, :store, :node, :sort, :page
    attr_accessible :vote, :flag, :date_val, :time_val, :keyword, :url, :rsp

end

What type will the values with CHAR(1) be mapped to, is there a way to specify that in the model?