spring data neo4j ,i can't solve it - spring

Question

I use spring data neo4j,i have user.class.movie.class,rating.class,i create relationship between movie and rating,when i run the programer,i can get the rating(star,comment)but cannot get the movie's title(null)
movie.class
package com.oberon.fm.domain;
#NodeEntity
public class Movie {
#GraphId
Long nodeId;
#Indexed(indexType = IndexType.FULLTEXT, indexName = "id")
String id;
#Indexed(indexType = IndexType.FULLTEXT, indexName = "search", numeric = false)
String title;
String description;
#RelatedTo(type = "DIRECTED", direction = INCOMING)
Person director;
#RelatedTo(type = "ACTS_IN", direction = INCOMING)
Set<Person> actors;
#RelatedToVia(elementClass = Role.class, type = "ACTS_IN", direction = INCOMING)
// Iterable<Role> roles;
Set<Role> roles = new HashSet<>();
#RelatedToVia(elementClass = Rating.class, type = "RATED", direction = INCOMING)
#Fetch
Iterable<Rating> ratings;
// Set<Rating> ratings = new HashSet<>();
private String language;
private String imdbId;
private String tagline;
private Date releaseDate;
private Integer runtime;
private String homepage;
private String trailer;
private String genre;
private String studio;
private Integer version;
private Date lastModified;
private String imageUrl;
public Movie() {
}
public Long getNodeId() {
return nodeId;
}
public void setNodeId(Long nodeId) {
this.nodeId = nodeId;
}
public Movie(String id, String title) {
this.id = id;
this.title = title;
}
public Collection<Person> getActors() {
return actors;
}
public Collection<Role> getRoles() {
return IteratorUtil.asCollection(roles);
}
public int getYear() {
if (releaseDate == null)
return 0;
Calendar cal = Calendar.getInstance();
cal.setTime(releaseDate);
return cal.get(Calendar.YEAR);
}
public String getId() {
return id;
}
public String getTitle() {
return title;
}
#Override
public String toString() {
return String.format("%s (%s) [%s]", title, releaseDate, id);
}
public String getDescription() {
return description;
}
public int getStars() {
Iterable<Rating> allRatings = ratings;
if (allRatings == null)
return 0;
int stars = 0, count = 0;
for (Rating rating : allRatings) {
stars += rating.getStars();
count++;
}
return count == 0 ? 0 : stars / count;
}
public Collection<Rating> getRatings() {
Iterable<Rating> allRatings = ratings;
return allRatings == null ? Collections.<Rating> emptyList()
: IteratorUtil.asCollection(allRatings);
}
/*
* public Set<Rating> getRatings() { return ratings; }
*/
public void setRatings(Set<Rating> ratings) {
this.ratings = ratings;
}
/*
* public void addRating(Rating rating) { ratings.add(rating); }
*/
public void setTitle(String title) {
this.title = title;
}
public void setLanguage(String language) {
this.language = language;
}
public void setImdbId(String imdbId) {
this.imdbId = imdbId;
}
public void setTagline(String tagline) {
this.tagline = tagline;
}
public void setDescription(String description) {
this.description = description;
}
public void setReleaseDate(Date releaseDate) {
this.releaseDate = releaseDate;
}
public void setRuntime(Integer runtime) {
this.runtime = runtime;
}
public void setHomepage(String homepage) {
this.homepage = homepage;
}
public void setTrailer(String trailer) {
this.trailer = trailer;
}
public void setGenre(String genre) {
this.genre = genre;
}
public void setStudio(String studio) {
this.studio = studio;
}
public void setVersion(Integer version) {
this.version = version;
}
public void setLastModified(Date lastModified) {
this.lastModified = lastModified;
}
public void setImageUrl(String imageUrl) {
this.imageUrl = imageUrl;
}
public String getLanguage() {
return language;
}
public String getImdbId() {
return imdbId;
}
public String getTagline() {
return tagline;
}
public Date getReleaseDate() {
return releaseDate;
}
public Integer getRuntime() {
return runtime;
}
public String getHomepage() {
return homepage;
}
public String getTrailer() {
return trailer;
}
public String getGenre() {
return genre;
}
public String getStudio() {
return studio;
}
public Integer getVersion() {
return version;
}
public Date getLastModified() {
return lastModified;
}
public String getImageUrl() {
return imageUrl;
}
public String getYoutubeId() {
String trailerUrl = trailer;
if (trailerUrl == null || !trailerUrl.contains("youtu"))
return null;
String[] parts = trailerUrl.split("[=/]");
int numberOfParts = parts.length;
return numberOfParts > 0 ? parts[numberOfParts - 1] : null;
}
#Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
Movie movie = (Movie) o;
if (nodeId == null)
return super.equals(o);
return nodeId.equals(movie.nodeId);
}
#Override
public int hashCode() {
return nodeId != null ? nodeId.hashCode() : super.hashCode();
}
public Person getDirector() {
return director;
}
}
user.class
package com.oberon.fm.domain;
#NodeEntity
public class User {
#GraphId
Long nodeId;
public static final String SALT = "cewuiqwzie";
public static final String FRIEND = "FRIEND";
public static final String RATED = "RATED";
#Indexed(indexType = IndexType.FULLTEXT, indexName = "login")
String login;
#Indexed
String name;
String password;
public void setPassword(String password) {
this.password = password;
}
String info;
private Roles[] roles;
public User() {
}
public User(String login, String name, String password, Roles... roles) {
this.login = login;
this.name = name;
this.password = encode(password);
this.roles = roles;
}
private String encode(String password) {
return new Md5PasswordEncoder().encodePassword(password, SALT);
}
#RelatedToVia(type = RATED)
#Fetch
Iterable<Rating> ratings;
// Set<Rating> ratings = new HashSet<>();
#RelatedTo(type = RATED)
Set<Movie> favorites;
public Set<Movie> getFavorites() {
return favorites;
}
public void setFavorites(Set<Movie> favorites) {
this.favorites = favorites;
}
#RelatedTo(type = FRIEND, direction = Direction.BOTH)
#Fetch
Set<User> friends;
public void addFriend(User friend) {
this.friends.add(friend);
}
public Rating rate(Neo4jOperations template, Movie movie, int stars,
String comment) {
final Rating rating = template.createRelationshipBetween(this, movie,
Rating.class, RATED, false).rate(stars, comment);
return template.save(rating);
}
/*
* public Rating rate(Movie movie, int stars, String comment) { if (ratings
* == null) { ratings = new HashSet<>(); }
*
* Rating rating = new Rating(this, movie, stars, comment);
* ratings.add(rating); movie.addRating(rating); return rating; }
*/
public Collection<Rating> getRatings() {
return IteratorUtil.asCollection(ratings);
}
/*
* public Set<Rating> getRatings() { return ratings; }
*/
#Override
public String toString() {
return String.format("%s (%s)", name, login);
}
public String getName() {
return name;
}
public Set<User> getFriends() {
return friends;
}
public Roles[] getRole() {
return roles;
}
public String getLogin() {
return login;
}
public String getPassword() {
return password;
}
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
public void updatePassword(String old, String newPass1, String newPass2) {
if (!password.equals(encode(old)))
throw new IllegalArgumentException("Existing Password invalid");
if (!newPass1.equals(newPass2))
throw new IllegalArgumentException("New Passwords don't match");
this.password = encode(newPass1);
}
public void setName(String name) {
this.name = name;
}
public boolean isFriend(User other) {
return other != null && getFriends().contains(other);
}
public enum Roles implements GrantedAuthority {
ROLE_USER, ROLE_ADMIN;
#Override
public String getAuthority() {
return name();
}
}
#Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
User user = (User) o;
if (nodeId == null)
return super.equals(o);
return nodeId.equals(user.nodeId);
}
public Long getId() {
return nodeId;
}
#Override
public int hashCode() {
return nodeId != null ? nodeId.hashCode() : super.hashCode();
}
}
rating.class
package com.oberon.fm.domain;
#RelationshipEntity
public class Rating {
private static final int MAX_STARS = 5;
private static final int MIN_STARS = 0;
#GraphId
Long id;
#StartNode
User user;
#EndNode
Movie movie;
int stars;
String comment;
public User getUser() {
return user;
}
public Movie getMovie() {
return movie;
}
public int getStars() {
return stars;
}
public void setStars(int stars) {
this.stars = stars;
}
public String getComment() {
return comment;
}
public void setComment(String comment) {
this.comment = comment;
}
public Rating rate(int stars, String comment) {
if (stars >= MIN_STARS && stars <= MAX_STARS)
this.stars = stars;
if (comment != null && !comment.isEmpty())
this.comment = comment;
return this;
}
public Rating() {
}
public void setUser(User user) {
this.user = user;
}
public void setMovie(Movie movie) {
this.movie = movie;
}
#Override
public boolean equals(Object o) {
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
Rating rating = (Rating) o;
if (id == null)
return super.equals(o);
return id.equals(rating.id);
}
#Override
public int hashCode() {
return id != null ? id.hashCode() : super.hashCode();
}
}
controller
#RequestMapping(value = "/user", method = RequestMethod.GET)
public String profile(Model model, HttpServletRequest request) {
// User user=populator.getUserFromSession();
HttpSession session = request.getSession(false);
User user = (User) session.getAttribute("user");
model.addAttribute("user", user);
if (user != null) {
List<MovieRecommendation> mr = movieRepository.getRecommendations(user.getLogin());
MovieRecommendation movie = new MovieRecommendation();
Movie m = new Movie();
m.setTitle("AA");
movie.setMovie(m);
mr.add(movie);
model.addAttribute("recommendations", mr);
}
return "user/index";
}![enter image description here][4]

Answer 1

It only loads the movie's id by default, if you don't specify #Fetch on the movie field. But I'd rather recommend to use template.fetch(rating.movie) to load it only when you need it.