This 2 parts tutorial will show you how we came up with a new symfony sfForm widget to handle many-to-many relationships. In our specific case, existing widgets for such relationships were found extremely unuser-friendly to say the least, we had to think about a new widget to help our users in their daily operation.
We do not pretend that our solution is the best in all user-cases but it is definitively a better approach when you have a lot of potential items to associate with your current object and a short list of associated items; the relationship between a classroom and students for example: you have a class of students (the class is less than 40 students usually) within a University of thousands of students.

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