function poll_update_7001

Use the poll_choice primary key to record votes in poll_votes rather than the choice order. Rename chorder to weight.

Rename {poll_choices} table to {poll_choice} and {poll_votes} to {poll_vote}.

File

modules/poll/poll.install, line 157

Code

function poll_update_7001() {
    // Add chid column and convert existing votes.
    db_add_field('poll_votes', 'chid', array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
    ));
    db_add_index('poll_votes', 'chid', array(
        'chid',
    ));
    db_update('poll_votes')->expression('chid', Database::getConnection()->prefixTables('COALESCE((SELECT chid FROM {poll_choices} c WHERE {poll_votes}.chorder = c.chorder AND {poll_votes}.nid = c.nid), 0)'))
        ->execute();
    // Delete invalid votes.
    db_delete('poll_votes')->condition('chid', 0)
        ->execute();
    // Remove old chorder column.
    db_drop_field('poll_votes', 'chorder');
    // Change the chorder column to weight in poll_choices.
    db_change_field('poll_choices', 'chorder', 'weight', array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
    ));
    db_rename_table('poll_votes', 'poll_vote');
    db_rename_table('poll_choices', 'poll_choice');
}