Editing-enabled MongoDB provider

This sample demonstrates how to create an editing-enabled custom data provider that allows for creating, reading, updating, and deleting polygon features served from a MongoDB instance. Click here to access the source code and dataset for the provider.
Before you begin, you will need to setup your own MongoDB instance and populate it with the provided dataset. The data are found in data/polygon.json.

How the Provider Works

This sample provider will read and write to a MongoDB instance that is populated with documents in the format below.

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{
  "_id": "1150d48a-4283-409f-95dc-d97487b8ad84",
  "fireId": "AK6448214467319840607",
  "fireName": "GLACIER CREEK",
  "fireType": "Wildfire",
  "acres": 1897,
  "location": {
    "type": "Polygon",
    "coordinates": [
      [
        [
          -104.05,
          48.99
        ],
        [
          -97.22,
          48.98
        ],
        [
          -96.58,
          45.94
        ],
        [
          -104.03,
          45.94
        ],
        [
          -104.05,
          48.99
        ]
      ]
    ]
  },
  "alternateID": 12345678
}

Notice in the document above the attribute alternateID. ArcGIS does not currently support strings as ObjectIDs, so the _id field generated by MongoDB cannot be used. If you inspect the sample code, there is a function that hashes the _id and saves the hashed integer as the alternateID in the document. This alternateID is used as the ObjectID. See the API Reference for details on designating a feature attribute as the ObjectID with the idField metadata property.

Set up the Provider

1. In a command prompt, run the cdf createapp mongodb-app command to create a new custom data app, or navigate to an existing custom data app.
2. Inside either the newly-created mongodb-app directory or an existing custom data app directory, run the cdf createprovider mongo-polygon-edits-provider command to create a custom data provider.
3. Copy the contents of the src folder in the provided source code into the src folder inside your providers/mongo-polygon-edits-provider/src directory.
4. Navigate to the providers/mongo-polygon-edits-provider directory in a command prompt, and run the command npm install config mongodb proj4 @esri/proj-codes to install the needed modules. proj4 and @esri/proj-codes are tools that are used for coordinate system conversion.

Configure the Provider

1. In the providers/mongo-polygon-edits-provider/cdconfig.json file, set the value of the properties.hosts field to true and properties.disableIdParam field to false.

2. In the provider/mongo-polygon-edits-provider/config directory, configure your MongoDB connection in the default.json file. The connectString in this sample assumes a locally running instance of MongoDB. It will look similar to this:

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{
    "editable_mongodb_polygon_provider": {
        "connectString": "mongodb://127.0.0.1:27017",
        "definedCollectionsOnly": true,
        "databases": {
            "edit-polygon-db": {
                "polygons": {
                    "geometryField": "location",
                    "idField": "alternateID",
                    "cacheTtl": 0,
                    "crs": 4326,
                    "maxRecordCount": 2000
                }
            }
        }
    }
}

Test the Provider

1. Navigate to the mongodb-app directory in a command prompt, and run the npm start command to start the custom data app.
2. In a web browser, navigate to http://localhost:8080/mongo-polygon-edits-provider/rest/services/edit-polygon-db/polygons/FeatureServer/0/query, and verify that the MongoDB provider is returning data points.

Build and Deploy the Custom Data Provider Package File

3. Stop the custom data app if it is running.
4. Open a command prompt and navigate to the custom data app directory.
5. Run the cdf export mongo-polygon-edits-provider command.
6. In a web browser, navigate to the ArcGIS Server Administrator Directory and sign in as an administrator.
7. Click uploads > upload.
8. On the Upload Item page, click Choose File and select the mongo-polygon-edits-provider.cdpk file. Optionally, provide a description in the Description text box.
9. Click Upload. Once the file is uploaded, you will be directed to a page with the following header: Uploaded item - <item_id> . Copy the item id.
10. Browse back to the root of the Administrator Directory and then click services > types > customdataproviders.
11. On the Registered Customdata Providers page, click register and paste the item id into the Id of uploaded item field.
12. Click Register.

Create Feature Service

1. Browse back to the root of the Administrator Directory and click services > createService.

2. On the Create Service page, copy and paste the following JSON into the Service (in JSON format) text box.

   Use dark colors for code blocksCopy

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   {
       "serviceName": "mongoEditPolygonFires",
       "type": "FeatureServer",
       "description": "",
       "capabilities": "Query",
       "provider": "CUSTOMDATA",
       "clusterName": "default",
       "minInstancesPerNode": 0,
       "maxInstancesPerNode": 0,
       "instancesPerContainer": 1,
       "maxWaitTime": 60,
       "maxStartupTime": 300,
       "maxIdleTime": 1800,
       "maxUsageTime": 600,
       "loadBalancing": "ROUND_ROBIN",
       "isolationLevel": "HIGH",
       "configuredState": "STARTED",
       "recycleInterval": 24,
       "recycleStartTime": "00:00",
       "keepAliveInterval": 1800,
       "private": false,
       "isDefault": false,
       "maxUploadFileSize": 0,
       "allowedUploadFileTypes": "",
       "properties": {
           "disableCaching": "true"
       },
       "jsonProperties": {
           "customDataProviderInfo": {
               "dataProviderName": "mongo-polygon-edits-provider",
               "dataProviderHost": "edit-polygon-db",
               "dataProviderId": "polygons"
           }
       },
       "extensions": [],
       "frameworkProperties": {},
       "datasets": []
   }

3. Click Create.

4. In ArcGIS Server Administrator Directory, navigate to Home > services > mongoEditPolygonFires > edit

5. Change the value of capabilities to Query,Editing, and click the Save Edits button.

Keep in mind that the provider code we used above assumes a database named edit-polygon-db and a collection named polygons. If you used different names in your MongoDB instance, update the values of dataProviderHost and dataProviderId accordingly.

Consume Feature Service

To access the MongoDB feature service that you created in the previous section, use the appropriate URL (e.g. https://<domain_or_machine_name>/<webadaptor_name>/rest/services/mongoEditPolygonFires/FeatureServer). You can use this URL to consume data from MongoDB in ArcGIS clients like ArcGIS Pro, ArcGIS Online, and ArcGIS Enterprise.