Tobias Mini Tobias Mini - 3 months ago 33
Java Question

Angular JS and Spring - how to filter JSON Object

I try to

PUT
a JSON Object from the Frontend to the Backend via Angular JS and Java Spring using the JHipster Framework. My JSON Object looks as follows:

{
"anzahl": 0,
"category": 0,
"id": 0,
"parkraumId": 0,
"timestamp": "2016-09-07T12:59:04.290Z",
"wochentag": 0
}


But to save it in the database via the Spring Repository method
createCrowdsource(crowdsource)
i need to filter out the values
wochentag
and
anzahl
to get the following JSON Object:

{
"category": 0,
"id": 0,
"parkraumId": 0,
"timestamp": "2016-09-07T12:59:04.290Z"
}


I tried it by specifying the
fields: 'category', 'id', 'parkraumId', 'timestamp'
in the following Angular JS controller and get this Parameter back in the Spring Resource with
@RequestParam String fields
but somehow it doesn´t work.

Angular Controller:

function save() {
vm.isSaving = true;
if (vm.crowdsource.id !== null) {
//JSON needs these two attributes

console.log('Updating!')
Crowdsource.update(vm.crowdsource, onSaveSuccess, onSaveError, {fields: 'category', 'id', 'parkraumId', 'timestamp'});
} else {

Crowdsource.save(vm.crowdsource, onSaveSuccess, onSaveError);
}
}

save()


Angular Service:

(function () {
'use strict';
angular
.module('bahnApp')
.factory('Crowdsource', Crowdsource);

Crowdsource.$inject = ['$resource', 'DateUtils'];

function Crowdsource($resource, DateUtils) {
var resourceUrl = 'api/crowdsources/:siteId';

return $resource(resourceUrl, {}, {
'query': {method: 'GET', isArray: true},
'get': {
method: 'GET',
transformResponse: function (data) {
if (data) {
data = angular.fromJson(data);
data.timestamp = DateUtils.convertDateTimeFromServer(data.timestamp);
}
return data;
}
},
'update': {
method: 'PUT',

}
});
}


})();


Spring Resource:

/**
* PUT /crowdsources : Updates an existing crowdsource.
*
* @param crowdsource the crowdsource to update
* @return the ResponseEntity with status 200 (OK) and with body the updated crowdsource,
* or with status 400 (Bad Request) if the crowdsource is not valid,
* or with status 500 (Internal Server Error) if the crowdsource couldnt be updated
* @throws URISyntaxException if the Location URI syntax is incorrect
*/
@RequestMapping(value = "/crowdsources",
method = RequestMethod.PUT,
produces = MediaType.APPLICATION_JSON_VALUE)
@Timed
public ResponseEntity<Crowdsource> updateCrowdsource(@RequestParam String fields, @RequestBody Crowdsource crowdsource) throws URISyntaxException {
log.debug("REST request to update Crowdsource : {}", crowdsource);
log.debug(crowdsource.toString());
if (crowdsource.getId() == null) {

return createCrowdsource(crowdsource);
}
Crowdsource result = crowdsourceRepository.save(crowdsource);
crowdsourceSearchRepository.save(result);
return ResponseEntity.ok()
.headers(HeaderUtil.createEntityUpdateAlert("crowdsource", crowdsource.getId().toString()))
.body(result);
}


Crowdsource:

/**
* A Crowdsource.
*/
@Entity
@Table(name = "crowdsource")
@Cache(usage = CacheConcurrencyStrategy.NONSTRICT_READ_WRITE)
@Document(indexName = "crowdsource")
@JsonFilter("myFilter")
public class Crowdsource implements Serializable {

private static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;

@Column(name = "category")
private Integer category;

@Column(name = "timestamp")
private ZonedDateTime timestamp;

@Column(name = "parkraum_id")
private Integer parkraumId;


private Integer anzahl;

private Integer wochentag;


public Integer getAnzahl() {
return anzahl;
}

public void setAnzahl(Integer anzahl) {
this.anzahl = anzahl;
}

public Integer getWochentag() {
return wochentag;
}

public void setWochentag(Integer wochentag) {
this.wochentag = wochentag;
}

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

public Integer getCategory() {
return category;
}

public void setCategory(Integer category) {
this.category = category;
}

public ZonedDateTime getTimestamp() {
return timestamp;
}

public void setTimestamp(ZonedDateTime timestamp) {
this.timestamp = timestamp;
}

public Integer getParkraumId() {
return parkraumId;
}

public void setParkraumId(Integer parkraumId) {
this.parkraumId = parkraumId;
}


@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;

Crowdsource that = (Crowdsource) o;

if (id != null ? !id.equals(that.id) : that.id != null) return false;
if (category != null ? !category.equals(that.category) : that.category != null) return false;
if (timestamp != null ? !timestamp.equals(that.timestamp) : that.timestamp != null) return false;
return parkraumId != null ? parkraumId.equals(that.parkraumId) : that.parkraumId == null;

}

@Override
public int hashCode() {
int result = id != null ? id.hashCode() : 0;
result = 31 * result + (category != null ? category.hashCode() : 0);
result = 31 * result + (timestamp != null ? timestamp.hashCode() : 0);
result = 31 * result + (parkraumId != null ? parkraumId.hashCode() : 0);
return result;
}

@Override
public String toString() {
return "Crowdsource{" +
"id=" + id +
", category=" + category +
", timestamp=" + timestamp +
", parkraumId=" + parkraumId +
'}';
}
}

Answer

To avoid persisting the values you can annotate them with @javax.persistence.Transient annotation in the CrowdSource entity. Those will be ignored for persistence.

@Transient private Integer anzahl;

@Transient private Integer wochentag