code: @Override
      public final Iterable<TrailerDocument> findAll(final String filename) {
          final Query searchQuery =
                  new Query(Criteria.where("filename").is(filename));
          final List<TrailerDocumentMongo> trailerDocumentsMongo =
                  mongoTemplate.find(searchQuery, TrailerDocumentMongo.class);
          if (trailerDocumentsMongo == null) {
              return null;
          }
          final List<TrailerDocument> trailerDocuments = new ArrayList<>();
          for (final TrailerDocument trailerDocument : trailerDocumentsMongo) {
              final Trailer trailer = (Trailer) toObjConverter.createGedObject(
                      null, trailerDocument);
              trailerDocument.setGedObject(trailer);
              trailerDocuments.add(trailerDocument);
          }
          return trailerDocuments;
      }
docs: {@inheritDoc}