find query for many to many relation propel

Question

i am new for propel . i face a problem to fetch all record form both table which have many to many relation .

i have a user and group table. and a join table us

Answer 1

You cannot join a many-to-many relation directly since there is no such thing in MySQL. You can do one of two things...

If you have a User object already, then you can simply "get" the related Groups this way:

$relatedGroups = $userObject->getGroups();

If you don't have a User object yet, and you want to populate all records (users and groups), then I think you could do this:

$users = UserQuery::create()
           ->join('User.UserGroup')
           ->join('UserGroup.Group')
           ->with('Group')  // this line hydrates Group objects as well as Users
           ->find();

Now in your code you can loop through Users and get each one's Groups without an extra DB hit:

foreach ($users as $user) {
  $user->getGroups();
  // normally this would be an extra DB hit, but because we used "->with('Group')"
  // above in the query, the objects are already hydrated.
}

Hope this helps. There is info on minimizing queries using "with()" on the Propel site as well info on many-to-many relationships (with query examples).