code: function (m1, m2, fship) {
      var query = {_id: m1};
  
      fship.added = new Date();
  
      var updater = {$push: {}};
      updater.$push[pathName] = fship;
  
      return _update(query, updater, fship);
    }
docs: Return a function to create a new friendship between two parties
  
  @api private