/PHP/Error: Call to a member function addEagerConstraints() on null in file

Error: Call to a member function addEagerConstraints() on null in file

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.

Error: Call to a member function addEagerConstraints() on null in file

in your relationship you are missing return statement, 
please follow the following example

public function user() {
        $this->belongsTo(User::class,'user_id','id');
}

to 
  
public function user() {
        return $this->belongsTo(User::class,'user_id','id');
    }

Source: stackoverflow.com

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