Link users with a record from a pivot table (many-to-many)

Hi All,

I am trying to build an app where I have students that are studying a specific field (IT, Business, etc) that belongs to a particular degree level (BSc, MSc).

I have created the degrees table and the fields table than I created a pivot table degree_field.

Now, when I register users I need to assign them to a particular degree_field based on the selected field and degree.

I have built already the ajax request to return on the registering form the fields of a selected degree.

Where I store the use how do I create a relationship between users and degree_field.

Thank you for time taken too look over my question !!!