Question

i have a tweet table that stores tweets and its replies like this

tweet(id, parent_id, tweet_message, time)

where parent_id is a self id if its a tweet and is of parent id if its a reply. how to do a find to pull out tweets where id = parent_id

example:

tweet(1, 1, ‘My name is Harsha’, ‘time’) parent_id = id since its a tweet and not a reply
tweet(2, 1, ‘Hello Harsha’, ‘time’) parent_id = 1 which tells its a reply to the tweet with id = 1

Answer 1

This should theoretically work. Look at the SQL Debug log to find out what it does if there are any errors

$conditions = array(
    'Tweet.id = Tweet.parent_id'
    );
$tweets = $Tweet->find('all', $conditions);

Or if you are looking for a specific ID you can do

$conditions = array(
    'Tweet.id' => 1,
    'Tweet.parent_id' => 1
    );
$tweets = $Tweet->find('all', $conditions);

you can use MySQL <> not operator to search for all nonroot tweets

$conditions = array(
    'Tweet.id' => 1,
    'Tweet.parent_id <>' => 1
    );
$tweets = $Tweet->find('all', $conditions);

or

'Tweet.id <> = Tweet.parent_id'