feature: recommended-movies-according-to-rating-in-same-genre (eb3a7786) · Commits · Lukáš Chudíček / iamdb

movie-recommender-microservice/README.md

+2 −0

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		@@ -29,7 +29,9 @@ Returns best rated movie in given genre.

		Returns recommended movie according to given movie id.

		### `GET /api/v1/movie-recommender/recommended-movies-according-to-rating-in-same-genre/{id}`

		Returns recommended movies according to rating in same genre.
		## Testing

		You can use swagger with url /api/v1/movie-recommender/swagger-ui/index.html to test the endpoints.

movie-recommender-microservice/src/main/java/cz/muni/fi/iamdb/rest/MovieRecommenderController.java

+7 −0

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		@@ -33,4 +33,11 @@ public class MovieRecommenderController {
		public Optional<MovieBasicViewDto> getBestRatedMovieInGenre(@PathVariable UUID id) {
		return movieRecommenderService.getBestRatedMovieInGenre(id);
		}

		@GetMapping("/recommended-movies-according-to-rating-in-same-genre/{id}")
		@Operation(summary = "Find recommended movies according to the rating in the same genre as the movie with the given id")
		@ApiResponse(responseCode = "200", description = "Movie found")
		public List<MovieBasicViewDto> getRecommendedMoviesAccordingToRatingInSameGenre(@PathVariable UUID id) {
		return movieRecommenderService.getRecommendedMoviesAccordingToRatingInSameGenre(id);
		}
		}

movie-recommender-microservice/src/main/java/cz/muni/fi/iamdb/service/MovieRecommenderService.java

+54 −0

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		@@ -65,6 +65,42 @@ public class MovieRecommenderService {
		.collect(Collectors.toList());
		}

		public List<MovieBasicViewDto> getRecommendedMoviesAccordingToRatingInSameGenre(UUID movieId) {
		ResponseEntity<MovieBasicViewDto> givenMoviesResponse = restTemplate.getForEntity(
		MOVIES_URL + "/" + movieId,
		MovieBasicViewDto.class
		);

		var givenMovie = givenMoviesResponse.getBody();
		if (givenMovie == null) {
		return Collections.emptyList();
		}

		var genreId = givenMovie.genres()[0].getId();

		ResponseEntity<MovieBasicViewDto[]> moviesWithGivenGenreResponse = restTemplate.getForEntity(
		MOVIES_URL + "?genreId=" + genreId,
		MovieBasicViewDto[].class
		);

		var moviesWithGivenGenre = moviesWithGivenGenreResponse.getBody();

		if (moviesWithGivenGenre == null \|\| moviesWithGivenGenre.length == 0) {
		return Collections.emptyList();
		}

		Map<UUID, Double> movieRatings = Arrays.stream(moviesWithGivenGenre)
		.collect(Collectors.toMap(MovieBasicViewDto::id, this::calculateMovieRating));

		return Arrays.stream(moviesWithGivenGenre)
		.map(movie -> new MovieRating(movie, movieRatings.getOrDefault(movie.id(), 0.0)))
		.sorted()
		.limit(5)
		.map(movieRating -> movieRating.movie)
		.collect(Collectors.toList());

		}

		public Optional<MovieBasicViewDto> getBestRatedMovieInGenre(UUID genreId) {
		ResponseEntity<MovieBasicViewDto[]> moviesWithGivenGenreResponse = restTemplate.exchange(
		MOVIES_URL + "?genreId=" + genreId,
		@@ -140,5 +176,23 @@ public class MovieRecommenderService {
		return intersection / union;
		}

		private double calculateMovieRating(MovieBasicViewDto movie){
		ResponseEntity<RatingDto[]> ratingsResponse = restTemplate.getForEntity(
		RATINGS_URL + "/movie/" + movie.id(),
		RatingDto[].class
		);

		var ratings = ratingsResponse.getBody();

		if (ratings == null \|\| ratings.length == 0) {
		return 0;
		}

		return Arrays.stream(ratings)
		.mapToDouble(RatingDto::getScore)
		.average()
		.orElse(0);
		}


		}

movie-recommender-microservice/src/test/java/cz/muni/fi/iamdb/rest/MovieRecommenderRestControllerTest.java

+42 −1

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		@@ -17,7 +17,6 @@ import java.util.Optional;
		import java.util.UUID;

		import static org.assertj.core.api.Assertions.assertThat;
		import static org.junit.jupiter.api.Assertions.assertThrows;

		@ExtendWith(MockitoExtension.class)
		public class MovieRecommenderRestControllerTest {
		@@ -94,4 +93,46 @@ public class MovieRecommenderRestControllerTest {
		// assert
		assertThat(response).containsExactly(movie1, movie2);
		}

		@Test
		void getBestRatedMovieInGenre_noMovies_returnsEmptyOptional() {
		// setup
		UUID id = UUID.randomUUID();
		Mockito.when(movieRecommenderService.getBestRatedMovieInGenre(id)).thenReturn(Optional.empty());

		// act
		var response = movieRecommenderController.getBestRatedMovieInGenre(id);

		// assert
		assertThat(response).isEmpty();
		}

		@Test
		void getRecommendedMoviesAccordingToRatingInSameGenre_noMovies_returnsEmptyList() {
		// setup
		UUID id = UUID.randomUUID();
		Mockito.when(movieRecommenderService.getRecommendedMoviesAccordingToRatingInSameGenre(id)).thenReturn(Collections.emptyList());

		// act
		var response = movieRecommenderController.getRecommendedMoviesAccordingToRatingInSameGenre(id);

		// assert
		assertThat(response).isEmpty();
		}

		@Test
		void getRecommendedMoviesAccordingToRatingInSameGenre_singleMovie_returnsThatMovie() {
		// setup
		UUID id = UUID.randomUUID();
		GenreDto genre = new GenreDto();
		genre.setName("Action");
		var movie = new MovieBasicViewDto(id, "title", 1, 1, new GenreDto[] {genre});
		Mockito.when(movieRecommenderService.getRecommendedMoviesAccordingToRatingInSameGenre(id)).thenReturn(Collections.singletonList(movie));

		// act
		var response = movieRecommenderController.getRecommendedMoviesAccordingToRatingInSameGenre(id);

		// assert
		assertThat(response).containsExactly(movie);
		}
		}

movie-recommender-microservice/src/test/java/cz/muni/fi/iamdb/service/MovieRecommenderServiceTest.java

+83 −0

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		package cz.muni.fi.iamdb.service;

		import cz.muni.fi.iamdb.api.RatingDto;
		import org.junit.jupiter.api.Test;
		import org.junit.jupiter.api.extension.ExtendWith;
		import org.mockito.InjectMocks;
		@@ -20,6 +21,9 @@ public class MovieRecommenderServiceTest {
		@Value("${app.urls.movies}")
		private String MOVIES_URL;

		@Value("${app.urls.ratings}")
		private String RATINGS_URL;

		@Mock
		private RestTemplate restTemplate;

		@@ -60,6 +64,85 @@ public class MovieRecommenderServiceTest {
		// assert
		assertThat(response).isEmpty();
		}

		@Test
		void getRecommendedMovies_noGivenMovie() {
		// setup
		UUID id = UUID.randomUUID();
		GenreDto genre = new GenreDto();
		genre.setName("Action");
		var movie = new MovieBasicViewDto(UUID.randomUUID(), "title", 1, 1, new GenreDto[] {genre});

		Mockito.when(restTemplate.getForEntity(MOVIES_URL, MovieBasicViewDto[].class)).thenReturn(ResponseEntity.ok(new MovieBasicViewDto[] {movie}));

		// act
		var response = movieRecommenderService.getRecommendedMovies(id);

		// assert
		assertThat(response).isEmpty();
		}


		@Test
		void getRecommendedMoviesAccordingToRatingInSameGenre_noGivenMovie() {
		// setup
		UUID id = UUID.randomUUID();
		Mockito.when(restTemplate.getForEntity(MOVIES_URL + "/" + id, MovieBasicViewDto.class)).thenReturn(ResponseEntity.ok(null));

		// act
		var response = movieRecommenderService.getRecommendedMoviesAccordingToRatingInSameGenre(id);

		// assert
		assertThat(response).isEmpty();
		}

		@Test
		void getRecommendedMoviesAccordingToRatingInSameGenre_noMoviesWithGivenGenre() {
		// setup
		UUID id = UUID.randomUUID();
		GenreDto genre = new GenreDto();
		genre.setId(UUID.randomUUID());
		genre.setName("Action");
		var movie = new MovieBasicViewDto(id, "title", 1, 1, new GenreDto[] {genre});

		Mockito.when(restTemplate.getForEntity(MOVIES_URL + "/" + id, MovieBasicViewDto.class)).thenReturn(ResponseEntity.ok(movie));
		Mockito.when(restTemplate.getForEntity(MOVIES_URL + "?genreId=" + genre.getId(), MovieBasicViewDto[].class)).thenReturn(ResponseEntity.ok(new MovieBasicViewDto[0]));

		// act
		var response = movieRecommenderService.getRecommendedMoviesAccordingToRatingInSameGenre(id);

		// assert
		assertThat(response).isEmpty();
		}

		@Test
		void getRecommendedMoviesAccordingToRatingInSameGenre() {
		// setup
		UUID id = UUID.randomUUID();
		GenreDto genre = new GenreDto();
		genre.setName("Action");
		var movie = new MovieBasicViewDto(id, "title", 1, 1, new GenreDto[] {genre});

		UUID id_2 = UUID.randomUUID();
		GenreDto genre_2 = new GenreDto();
		genre_2.setName("Action");
		var movie_2 = new MovieBasicViewDto(id_2, "title2", 2, 2, new GenreDto[] {genre_2});

		RatingDto rating = new RatingDto();
		rating.setScore(5.0);
		rating.setMovieId(id_2);

		Mockito.when(restTemplate.getForEntity(MOVIES_URL + "/" + id, MovieBasicViewDto.class)).thenReturn(ResponseEntity.ok(movie));
		Mockito.when(restTemplate.getForEntity(MOVIES_URL + "?genreId=" + genre.getId(), MovieBasicViewDto[].class)).thenReturn(ResponseEntity.ok(new MovieBasicViewDto[] {movie_2}));
		Mockito.when(restTemplate.getForEntity(RATINGS_URL + "/movie/" + id_2, RatingDto[].class))
		.thenReturn(ResponseEntity.ok(new RatingDto[] {rating}));
		// act
		var response = movieRecommenderService.getRecommendedMoviesAccordingToRatingInSameGenre(id);

		// assert
		assertThat(response).containsExactly(movie_2);
		}

		}