Creating Movie classes

The movie data model shows entities for movies, people, and the relationships between them. You will start your application domain with the Movie entity.

Movie domain class

A Java domain class will represent the Movie entity. While you wouldn’t need to map all of the fields on the Movie node, you will go ahead and map all of them for this example.

Open the Movie.java class in the src/main/java/com/example/appspringdata directory.

Click to reveal completed Movie domain class code

java

package com.example.appspringdata;

import org.springframework.data.annotation.Id;
import org.springframework.data.neo4j.core.schema.Node;

@Node
public class Movie {

    @Id
    private String movieId;

    private String title;
    private String plot;
    private String poster;
    private String url;
    private String imdbId;
    private String tmdbId;
    private String released;

    private Long year;
    private Long runtime;
    private Long budget;
    private Long revenue;
    private Long imdbVotes;

    private Double imdbRating;

    private String[] languages;
    private String[] countries;

    public Movie(String movieId, String title, String plot, String poster, String url, String imdbId, String tmdbId,
            String released, Long year, Long runtime, Long budget, Long revenue, Long imdbVotes, Double imdbRating,
            String[] languages, String[] countries) {
        this.movieId = movieId;
        this.title = title;
        this.plot = plot;
        this.poster = poster;
        this.url = url;
        this.imdbId = imdbId;
        this.tmdbId = tmdbId;
        this.released = released;
        this.year = year;
        this.runtime = runtime;
        this.budget = budget;
        this.revenue = revenue;
        this.imdbVotes = imdbVotes;
        this.imdbRating = imdbRating;
        this.languages = languages;
        this.countries = countries;
    }

    public String getMovieId() {
        return movieId;
    }

    public String getTitle() {
        return title;
    }

    public String getPlot() {
        return plot;
    }

    public String getPoster() {
        return poster;
    }

    public String getUrl() {
        return url;
    }

    public String getImdbId() {
        return imdbId;
    }

    public String getTmdbId() {
        return tmdbId;
    }

    public String getReleased() {
        return released;
    }

    public Long getYear() {
        return year;
    }

    public Long getRuntime() {
        return runtime;
    }

    public Long getBudget() {
        return budget;
    }

    public Long getRevenue() {
        return revenue;
    }

    public Long getImdbVotes() {
        return imdbVotes;
    }

    public Double getImdbRating() {
        return imdbRating;
    }

    public String[] getLanguages() {
        return languages;
    }

    public String[] getCountries() {
        return countries;
    }
}

Review the code and note the following:

The Movie class definition:
java
```
@Node
public class Movie {
```
The @Node annotation above the class definition marks the class as a node entity.

That Movie node properties are mapped to Movie class attributes with a relevant data type:

text

Movie node properties and data types

{
  budget:"INTEGER",
  movieId:"STRING",
  tmdbId:"STRING",
  imdbVotes:"INTEGER",
  runtime:"INTEGER",
  countries:"LIST OF STRING",
  imdbId:"STRING",
  url:"STRING",
  plot:"STRING",
  released:"STRING",
  languages:"LIST OF STRING",
  imdbRating:"FLOAT",
  title:"STRING",
  poster:"STRING",
  year:"INTEGER",
  revenue:"INTEGER"
}

java

Movie class attributes

    @Id
    private String movieId;

    private String title;
    private String plot;
    private String poster;
    private String url;
    private String imdbId;
    private String tmdbId;
    private String released;

    private Long year;
    private Long runtime;
    private Long budget;
    private Long revenue;
    private Long imdbVotes;

    private Double imdbRating;

    private String[] languages;
    private String[] countries;

The @Id annotation on the movieId field marks it as the node identifier.

The class constructor:

java

    public Movie(String movieId, String title, String plot, String poster, String url, String imdbId, String tmdbId,
            String released, Long year, Long runtime, Long budget, Long revenue, Long imdbVotes, Double imdbRating,
            String[] languages, String[] countries) {
        this.movieId = movieId;
        this.title = title;
        this.plot = plot;
        this.poster = poster;
        this.url = url;
        this.imdbId = imdbId;
        this.tmdbId = tmdbId;
        this.released = released;
        this.year = year;
        this.runtime = runtime;
        this.budget = budget;
        this.revenue = revenue;
        this.imdbVotes = imdbVotes;
        this.imdbRating = imdbRating;
        this.languages = languages;
        this.countries = countries;
    }

Getter and setters for each property:

    public String getMovieId() {
        return movieId;
    }

    public String getTitle() {
        return title;
    }
    ...

The Neo4j Values and types documentation (Table 1) shows theNeo4j data types and equivalent Java type.

MovieId

For simplicity, you are using the existing movieId key value and only the @Id annotation. The preferred method is to use a UUIDGenerator or optimistic locking with external id values.

Related entity in constructor

You can include the related entity in the constructor because there isn’t a bidirectional relationship defined (Movie←Person, Person→Movie) and the data model is not cyclic (you cannot iterate over same movie and person multiple times).

Advice on how to manage bidirectional relationships is covered later in this module.

Summary

In this lesson, you created the Movie domain class.

Next, you will complete a challenge to apply the skills you learned here to create the Person domain class.

Building Neo4j Applications with Spring Data

Getting Started

The Application Domain Model

Reading Data from Neo4j

Writing Data to Neo4j

Custom Cypher for Read and Write

Next Steps

Creating Movie classes

Movie domain class

Summary