code: function _removeOne(
    ownerModel,
    ownerId,
    childModel,
    childId,
    associationName,
    Log
  ) {
    let request = { params: { ownerId: ownerId, childId: childId } }
    return _removeOneHandler(
      ownerModel,
      ownerId,
      childModel,
      childId,
      associationName,
      request,
      Log
    )
  }
docs: RemoveOne function exposed as a mongoose wrapper.
  @param ownerModel: The model that is being removed from.
  @param ownerId: The id of the owner document.
  @param childModel: The model that is being removed.
  @param childId: The id of the child document.
  @param associationName: The name of the association from the ownerModel's perspective.
  @param Log: A logging object
  @returns {object} A promise returning true if the remove succeeds.
  @private