code: function backwardsManyToOneDescriptor(declaredFieldName, declaredFromModelName) {
      return {
          get() {
              const {
                  session: {
                      [declaredFromModelName]: DeclaredFromModel,
                  },
              } = this.getClass();
  
              return DeclaredFromModel.filter({
                  [declaredFieldName]: this.getId(),
              });
          },
          set() {
              throw new Error('Can\'t mutate a reverse many-to-one relation.');
          },
      };
  }
docs: The backwards direction of a n-to-1 relationship (i.e. 1-to-n),
  meaning this will return an a collection (`QuerySet`) of model instances.
  
  An example would be `author.books` referencing all instances of
  the `Book` model that reference the author using `fk()`.