Update attributes (feature service)

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Update feature attributes in an online feature service.

screenshot

Use case

Online feature services can be updated with new data. This is useful for updating existing data in real time while working in the field.

How to use the sample

To change the feature's damage property, tap the feature to select it, and update the damage type using the drop down.

How it works

  1. Create a ServiceFeatureTable object from a URL.
    • When the table loads, you can get the domain to determine which options to present in your UI.
  2. Create a FeatureLayer object from the ServiceFeatureTable.
  3. Select features from the FeatureLayer.
  4. To update the feature's attribute, first load it, then use the attributeValue.
  5. Update the table with updateFeature.
  6. After a change, apply the changes on the server using applyEdits.

Relevant API

  • ArcGISFeature
  • FeatureLayer
  • ServiceFeatureTable

Tags

amend, attribute, details, edit, editing, information, value

Sample Code

UpdateAttributesFeatureService.cppUpdateAttributesFeatureService.cppUpdateAttributesFeatureService.hUpdateAttributesFeatureService.qml
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// [WriteFile Name=UpdateAttributesFeatureService, Category=EditData]
// [Legal]
// Copyright 2016 Esri.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

#include "UpdateAttributesFeatureService.h"

#include "Map.h"
#include "MapQuickView.h"
#include "Basemap.h"
#include "Viewpoint.h"
#include "Point.h"
#include "SpatialReference.h"
#include "ServiceFeatureTable.h"
#include "FeatureLayer.h"
#include "Feature.h"
#include "ArcGISFeature.h"
#include "FeatureEditResult.h"
#include "FeatureQueryResult.h"
#include <QUrl>
#include <QUuid>
#include <QMouseEvent>

using namespace Esri::ArcGISRuntime;

namespace
{
  // Convenience RAII struct that deletes all pointers in given container.
  struct FeatureEditListResultLock
  {
    FeatureEditListResultLock(const QList<FeatureEditResult*>& list) : results(list) { }
    ~FeatureEditListResultLock() { qDeleteAll(results); }
    const QList<FeatureEditResult*>& results;
  };
}

UpdateAttributesFeatureService::UpdateAttributesFeatureService(QQuickItem* parent) :
  QQuickItem(parent)
{
}

UpdateAttributesFeatureService::~UpdateAttributesFeatureService() = default;

void UpdateAttributesFeatureService::init()
{
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<UpdateAttributesFeatureService>("Esri.Samples", 1, 0, "UpdateAttributesFeatureServiceSample");
  qmlRegisterUncreatableType<CalloutData>("Esri.Samples", 1, 0, "CalloutData", "CalloutData is an uncreatable type");
}

void UpdateAttributesFeatureService::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");
  m_mapView->setWrapAroundMode(WrapAroundMode::Disabled);

  // create a Map by passing in the Basemap
  m_map = new Map(BasemapStyle::ArcGISStreets, this);
  m_map->setInitialViewpoint(Viewpoint(Point(-10800000, 4500000, SpatialReference(102100)), 3e7));

  // set map on the map view
  m_mapView->setMap(m_map);

  // create the ServiceFeatureTable
  m_featureTable = new ServiceFeatureTable(QUrl("https://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0"), this);

  // create the FeatureLayer with the ServiceFeatureTable and add it to the Map
  m_featureLayer = new FeatureLayer(m_featureTable, this);
  m_map->operationalLayers()->append(m_featureLayer);

  connectSignals();
}

void UpdateAttributesFeatureService::connectSignals()
{
  // connect to the mouse clicked signal on the MapQuickView
  connect(m_mapView, &MapQuickView::mouseClicked, this, [this](QMouseEvent& mouseEvent)
  {
    // first clear the selection
    m_featureLayer->clearSelection();

    // set the properties for qml
    emit hideWindow();

    // call identify on the map view
    m_mapView->identifyLayer(m_featureLayer, mouseEvent.x(), mouseEvent.y(), 5, false, 1);
  });

  // connect to the viewpoint changed signal on the MapQuickView
  connect(m_mapView, &MapQuickView::viewpointChanged, this, [this]()
  {
    m_featureLayer->clearSelection();
    emit hideWindow();
  });

  // connect to the identifyLayerCompleted signal on the map view
  connect(m_mapView, &MapQuickView::identifyLayerCompleted, this, [this](QUuid, IdentifyLayerResult* identifyResult)
  {
    if(!identifyResult)
      return;
    if (!identifyResult->geoElements().empty())
    {
      // select the item in the result
      m_featureLayer->selectFeature(static_cast<Feature*>(identifyResult->geoElements().at(0)));
      // Update the parent so the featureLayer is not deleted when the identifyResult is deleted.
      m_featureLayer->setParent(this);

      // obtain the selected feature with attributes
      QueryParameters queryParams;
      QString whereClause = "objectid=" + identifyResult->geoElements().at(0)->attributes()->attributeValue("objectid").toString();
      queryParams.setWhereClause(whereClause);
      m_featureTable->queryFeatures(queryParams);
    }
  });

  // connect to the queryFeaturesCompleted signal on the feature table
  connect(m_featureTable, &FeatureTable::queryFeaturesCompleted, this, [this](QUuid, FeatureQueryResult* featureQueryResult)
  {
    if (featureQueryResult && featureQueryResult->iterator().hasNext())
    {
      // first delete if not nullptr
      if (m_selectedFeature)
        delete m_selectedFeature;

      // set selected feature member
      m_selectedFeature = static_cast<ArcGISFeature*>(featureQueryResult->iterator().next(this));
      m_selectedFeature->setParent(this);
      m_featureType = m_selectedFeature->attributes()->attributeValue("typdamage").toString();
      m_mapView->calloutData()->setTitle(QString("<br><font size=\"+2\"><b>%1</b></font>").arg(m_featureType));
      m_mapView->calloutData()->setLocation(m_selectedFeature->geometry().extent().center());
      emit featureTypeChanged();
      emit featureSelected();
    }
  });

  // connect to the updateFeatureCompleted signal to determine if the update was successful
  connect(m_featureTable, &ServiceFeatureTable::updateFeatureCompleted, this, [this](QUuid, bool success)
  {
    // if the update was successful, call apply edits to apply to the service
    if (success)
      m_featureTable->applyEdits();
  });

  // connect to the applyEditsCompleted signal from the ServiceFeatureTable
  connect(m_featureTable, &ServiceFeatureTable::applyEditsCompleted, this, [this](QUuid, const QList<FeatureEditResult*>& featureEditResults)
  {
    // Lock is a convenience wrapper that deletes the contents of featureEditResults when we leave scope.
    FeatureEditListResultLock lock(featureEditResults);

    // check if result list is not empty
    if (!lock.results.isEmpty())
    {
      // obtain the first item in the list
      FeatureEditResult* featureEditResult = lock.results.first();
      // check if there were errors, and if not, log the new object ID
      if (!featureEditResult->isCompletedWithErrors())
        qDebug() << "Successfully updated attribute for Object ID:" << featureEditResult->objectId();
      else
        qDebug() << "Apply edits error.";
    }
    m_featureLayer->clearSelection();
  });
}

void UpdateAttributesFeatureService::updateSelectedFeature(QString fieldVal)
{
  // If the last connection is still hanging around we want to ensure it is disconnected.
  disconnect(m_featureLoadStatusChangedConnection);

  // connect to load status changed signal, remember the connection so we can kill it once
  // the slot has invoked.
  m_featureLoadStatusChangedConnection =
      connect(
          m_selectedFeature, &ArcGISFeature::loadStatusChanged,
          this, [this, fieldVal](Esri::ArcGISRuntime::LoadStatus)
                {
                  if (m_selectedFeature->loadStatus() == LoadStatus::Loaded)
                  {
                    // The conenction is invoked so we now forget all about this connection after this point.
                    disconnect(m_featureLoadStatusChangedConnection);

                    // update the select feature's attribute value
                    m_selectedFeature->attributes()->replaceAttribute("typdamage", fieldVal);

                    // update the feature in the feature table
                    m_featureTable->updateFeature(m_selectedFeature);
                  }
                }
  );

  // load selecte feature
  m_selectedFeature->load();
}

QString UpdateAttributesFeatureService::featureType() const
{
  return m_featureType;
}

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