Symfony\Component\Debug\Exception\FatalThrowableError Call to a member function addEagerConstraints() on null code example

Example 1: Call to a member function addEagerConstraints() on null

You are missing return statements in the methods that define relations. They need to return relation definition.

Example 2: Symfony\Component\Debug\Exception\FatalThrowableError : Call to a member function nullable() on null

you have to write timestamp instead of timestamps