So verschachteln Sie Entitäten mit Spring Data REST

Baue ich eine Spring Data REST-Anwendung und ich habe einige Probleme wenn ich versuche zu POSTEN. Die Hauptorganisation hat die anderen zwei verbundene Einheiten geschachtelt sind.

Gibt es eine "Abfrage" Objekt, das die vielen Antworten und jede dieser Antworten haben viele Antworten.

Generiere ich eine JSON-wie dies von der Vorderseite Anwendung für die POST Abfrage:

{
    "user": "http://localhost:8080/users/1",
    "status": 1,
    "answers": [
        {
            "img": "urlOfImg",
            "question": "http://localhost:8080/question/6",
            "replies": [
                {
                    "literal": "http://localhost:8080/literal/1",
                    "result": "6"
                },
                {
                    "literal": "http://localhost:8080/literal/1",
                    "result": "6"
                }
            ]
        },
        {
            "img": "urlOfImg",
            "question": "http://localhost:8080/question/6",
            "replies": [
                {
                    "literal": "http://localhost:8080/literal/3",
                    "result": "10"
                }
            ]
        }
    ]
}

Aber wenn ich versuche, es zu senden, bekomme ich folgende Fehler-Antwort:

{

    "cause" : {
        "cause" : {
          "cause" : null,
          "message" : "Template must not be null or empty!"
        },
        "message" : "Template must not be null or empty! (through reference chain: project.models.Questionary[\"answers\"])"
      },
      "message" : "Could not read JSON: Template must not be null or empty! (through reference chain: project.models.Questionary[\"answers\"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Template must not be null or empty! (through reference chain: project.models.Questionary[\"answers\"])"
}

Edit:

Stell ich auch mein repository:

@RepositoryRestResource(collectionResourceRel = "questionaries", path = "questionaries")
public interface InspeccionRepository extends JpaRepository<Inspeccion, Integer> {
    @RestResource(rel="byUser", path="byUser")
    public List<Questionary> findByUser (@Param("user") User user);
}

Meiner Entität Fragebogen Klasse ist :

@Entity @Table(name="QUESTIONARY", schema="enco" )
public class Questionary implements Serializable {
     private static final long serialVersionUID = 1L;
     //----------------------------------------------------------------------
     //ENTITY PRIMARY KEY ( BASED ON A SINGLE FIELD )
     //----------------------------------------------------------------------
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEC_QUESTIONARY")
     @SequenceGenerator(name = "SEC_QUESTIONARY", sequenceName = "ENCO.SEC_QUESTIONARY", allocationSize = 1)
     @Column(name="IDQUES", nullable=false)
     private Integer idques        ;

     //----------------------------------------------------------------------
     //ENTITY DATA FIELDS 
     //----------------------------------------------------------------------    

     @Column(name="ESTATUS")
     private Integer estatus       ;


     //----------------------------------------------------------------------
     //ENTITY LINKS ( RELATIONSHIP )
     //----------------------------------------------------------------------

     @ManyToOne
     @JoinColumn(name="IDUSER", referencedColumnName="IDUSER")
     private User user;

     @OneToMany(mappedBy="questionary", targetEntity=Answer.class)
     private List<Answer> answers;



     //----------------------------------------------------------------------
     //CONSTRUCTOR(S)
     //----------------------------------------------------------------------
     public Questionary()
     {
        super();
     }


     //----------------------------------------------------------------------
     //GETTERS & SETTERS FOR FIELDS
     //----------------------------------------------------------------------

     //--- DATABASE MAPPING : IDNSE ( NUMBER ) 
     public void setIdnse( Integer idnse )
     {
         this.idnse = idnse;
     }
     public Integer getIdnse()
     {
         return this.idnse;
     }

     //--- DATABASE MAPPING : ESTADO ( NUMBER ) 
     public void setEstatus Integer estatus )
     {
         this.estatus = estatus;
     }
     public Integer getEstatus()
     {
         return this.estatus;
     }      
     //----------------------------------------------------------------------
     //GETTERS & SETTERS FOR LINKS
     //----------------------------------------------------------------------
     public void setUser( Usuario user )
     {
         this.user = user;
     }
     public User getUser()
     {
         return this.user;
     }


     public void setAnswers( List<Respuesta> answers )
     {
         this.answers = answer;
     }
     public List<Answer> getAnswers()
     {
         return this.answers;
     }


     //Get Complete Object method      public List<Answer>
     getAnswerComplete() {
         List<Answer> answers = this.answers;
         return answers;
    }
}

Meine Antwort Einheit:

 @Entity @Table(name="ANSWER", schema="enco" ) public class Answer
 implements Serializable {
     private static final long serialVersionUID = 1L;

     //----------------------------------------------------------------------
     //ENTITY PRIMARY KEY ( BASED ON A SINGLE FIELD )
     //----------------------------------------------------------------------
     @Id
     @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "SEC_ANSWER")
     @SequenceGenerator(name = "SEC_ANSWER", sequenceName = "ENCOADMIN.SEC_ANSWER", allocationSize = 1)
     @Column(name="IDANS", nullable=false)
     private Integer idans        ;


     //----------------------------------------------------------------------
     //ENTITY DATA FIELDS 
     //----------------------------------------------------------------------    

     @Column(name="IMG", length=100)
     private String     img       ;


     //----------------------------------------------------------------------
     //ENTITY LINKS ( RELATIONSHIP )
     //----------------------------------------------------------------------
     @ManyToOne
     @JoinColumn(name="IDQUES", referencedColumnName="IDQUES")
     private Questionary questionary  ;

     @OneToMany(mappedBy="answer", targetEntity=Reply.class)
     private List<Reply> replies;

     @ManyToOne
     @JoinColumn(name="IDQUE", referencedColumnName="IDQUE")
     private Question Question    ;


     //----------------------------------------------------------------------
     //CONSTRUCTOR(S)
     //----------------------------------------------------------------------
     public Answer()
     {
        super();
     }

     //----------------------------------------------------------------------
     //GETTER & SETTER FOR THE KEY FIELD
     //----------------------------------------------------------------------
     public void setIdans( Integer idans )
     {
         this.idans = idans ;
     }
     public Integer getIdans()
     {
         return this.idans;
     }

     //----------------------------------------------------------------------
     //GETTERS & SETTERS FOR FIELDS
     //----------------------------------------------------------------------

     //--- DATABASE MAPPING : IMAGEN ( VARCHAR2 ) 
     public void setImg( String img )
     {
         this.img = img;
     }
     public String getImg()
     {
         return this.img;
     }


     //----------------------------------------------------------------------
     //GETTERS & SETTERS FOR LINKS
     //----------------------------------------------------------------------
     public void setQuestionary( Questionary questionary )
     {
         this.questionary = questionary;
     }
     public Questionary getQuestionary()
     {
         return this.questionary;
     }

     public void setReplies( List<Reply> contestaciones )
     {
         this.replies = replies;
     }
     public List<Reply> getReplies()
     {
         return this.replies;
     }

     public void setQuestion( Question question )
     {
         this.question = question;
     }
     public Question getQuestion()
     {
         return this.question;
     }


}

- Und dies ist der Fehler-Konsole:

Caused by: com.fasterxml.jackson.databind.JsonMappingException:
Template must not be null or empty! (through reference chain:
project.models.Questionary["answers"])  at
  com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.java:232)
 ~[jackson-databind-2.3.3.jar:2.3.3]    at *snip*

InformationsquelleAutor der Frage 73nko | 2014-07-04