CODEWITHSUNDEEP
javajsonjackson
TVH7
TVH7

Reputation: 465

Ignore Jackson property

{admin": false,
    "email": "[email protected]",
    "firstName": "Student",
    "idGroup": {
      "idGroup": 1,
      "name": "BlijkbaarGeenGroep",
      "teacher": {
        "admin": true,
        "email": "1",
        "firstName": "Example",
        "idUser": 1,
        "lastName": "User",
        "teacher": true
      }
    }

The folliwing is returned. What I want jackson todo is to ignore teacher. I don't really care about the teacher items for this call. Problem is I don't want to access the GroupEntity because I do need groupinfo sometimes. 

     package org.hva.folivora.daomodel.user;

    import com.owlike.genson.annotation.JsonIgnore;
    import com.owlike.genson.annotation.JsonProperty;
    import org.codehaus.jackson.annotate.JsonIgnoreProperties;
    import org.codehaus.jackson.annotate.JsonIgnoreType;
    import org.hva.folivora.daomodel.global.GroupEntity;

    import javax.persistence.*;
    import java.io.Serializable;

    /**
     * @author
     */
    @Entity
    @Table(name = "Student", schema = "pad_ijburg", catalog = "")
    public class StudentEntity extends UserEntity implements Serializable {
        private GroupEntity idGroup;

        public StudentEntity(String email, String firstName, String lastName, String password, GroupEntity idGroup) {
            //A student cannot be an admin or teacher. (False, False)
            super(email, firstName, lastName, password, false, false);
            this.idGroup = idGroup;
        }

        public StudentEntity() {

        }

//Something like ignore all but idgroup??!
        @ManyToOne(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
        @JoinColumn(name = "idGroup")
        public GroupEntity getIdGroup() {
            return idGroup;
        }

        public void setIdGroup(GroupEntity idGroup) {
            this.idGroup = idGroup;
        }

    }

Upvotes: 0

Views: 834

Answers (2)

Benjamin M
Benjamin M

Reputation: 24527

You have multiple options:

  1. Put @JsonIgnoreProperties on your StudentEntity class. See: JsonIgnoreProperties (Jackson-annotations 2.7.4 API).

  2. Write a custom JsonSerializer for StudentEntity. Here you will have to write down code that constructs each field for the output JSON. See: Jackson - Custom Serializer | Baeldung.

  3. Use a Mixin, which is basically an interface that matches your StudentEntity. Here you can use @JsonIgnore on the getTeacher() method. See: JacksonMixInAnnotations · FasterXML/jackson-docs Wiki · GitHub.

  4. Put a @JsonSerialize on you idGroup property within your StudentEntity class. The annotation takes a class as argument that implements JsonSerializer. Though you can specify a way to serialize the idGroup property if (and only if) Jackson serializes an instance of StudentEntity. (this is more or less just like option 2., but much more simple to implement)

  5. Write a DTO class that matches your output format. Then copy field by field from your StudentEntity object to the StudentEntityDTO object (which doesn't have a teacher property) and then let Jackson serialize the DTO object instead of the original StudentEntity object. That's a lot of code to write and only useful if the output JSON is really much different from the original object.

I'd go for one of the first four options.

Upvotes: 2

Tanvi B
Tanvi B

Reputation: 1567

Put @JsonIgnore on getter of teacher, it will not come in out put json

Upvotes: 0

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