code: function backwardsOneToOneDescriptor(declaredFieldName, declaredFromModelName) {
      return {
          get() {
              const {
                  session: {
                      [declaredFromModelName]: DeclaredFromModel,
                  },
              } = this.getClass();
  
              return DeclaredFromModel.get({
                  [declaredFieldName]: this.getId(),
              });
          },
          set() {
              throw new Error('Can\'t mutate a reverse one-to-one relation.');
          },
      };
  }
docs: Here we resolve 1-to-1 relationships starting at the model on which the
  field was not installed. This means we need to find the instance of the
  other model whose {@link module:fields.oneToOne|oneToOne} FK field contains the current model's primary key.
  
  @param  {string} declaredFieldName - the name of the field referencing the current model.
  @param  {string} declaredFromModelName - the name of the other model.