OfferContainer(1).js

const selectStocksByOfferId = createSelector(
  state => state.data.stocks,
  state, offerId => offerId,
  (stocks, offerId) => stocks && stocks.filter(stock => stock.offerId === offerId)
)

function mapStateToProps(state, ownProps) {
  const { match: { params: { offerId } } } = ownProps
  return {
    offer: selectOfferById(state, offerId),
    stocks: selectStocksByOfferId(state, offerId)
  }
}