External Lookups

An External Lookup field retrieves one or more records from a Web Service. Returned data is then mapped to one or more fields in the current record. The External Lookup field can do either of the following, or both:

• Get a single record to copy data from.
• Get multiple records, and let the user select the record to copy from.

Prerequisite

A Web Service must be configured.

How an External Lookup Works

Operation

An External Lookup field references data provided by a foreign data source, accessed using a Web Service. When an object record is added or updated, fields contained in the object record are used to identify the Lookup target. Thereafter, the fields returned from the foreign data source are available as read-only fields in the platform object record (like Lookup-Dependent Fields). For example, they can be used in a Rule condition or Document Template.

Considerations

• The field(s) used to identify the target record should constitute a unique key in the foreign data, so that only one record is returned. If multiple records are returned as target candidates, the last one returned is used.
• If no records are returned, the dependent fields remain empty.
• External Lookup-dependent fields are available for use in HTML, Word, and PowerPoint document templates. They are not available for use in JSP templates.
• An External Lookup is executed when a record is accessed. If the Web Service fails, an error message is displayed.

Sample Use

A customer record could contain a field that contains the customer ID from a SalesForce database. An External Lookup field can be used to automatically display data like contact information and credit score from that database, without having to maintain a separate copy of it in the platform.

Tip: A single External Lookup field lets you add multiple display-only fields to an object record. That's ideal when you always want to see the latest information retrieved from a central location. (Say, customer contact information.) On the other hand, there are times when you want to retrieve information from a remote source and store it locally. For example, today's price for fish might be retrieved from a central source, but you would need to store it in the record, and retrieve that information only when a new record is added (and not when some extraneous field is updated). For that situation, you should invoke a Web Service from a Process.

Settings

Basic Information

• Label - The name of the field. The user clicks in this field to select a record.
• Field Type - External Lookup
• Web Service - Choose a Web Service that has been configured for use in this application.
• Always Required - Clicking this checkbox prevents a record from being saved until this field has a value.
• Field Name - This value is pre-filled based on the field label, but can be modified when the field is first created, if desired.

External Lookup Configuration

• Input Mapping - Specify one mapping for each Web Service input.

The input fields allow filtering data to be sent to the Web Service. The combination of fields should produce exactly one record. (If more than one is returned, the last one is used.) The mapping choices are:

• Use Object Field - Use a Record field value for a Web Service input
• Use Fixed Value - Specify a value.

(This is the only option available when onFormLoad is specified.)

• Use Expression - Specify an expression using any combination of the above

Click the [+] and [-] icons to add or remove items.

• Output Mapping - Specify one mapping for each value returned by the Web Service.

• Ignore - Disregard the value returned from the web service.
• Display - The value is displayed to the user, with the label you specify.
  (It appears as a field that can be placed at the desired location in the record form.)

Click the [+] and [-] icons to add or remove items.

Search Service Configuration

The remaining configuration options work the same as a normal Lookup field.