Integrate a Currency Exchange Rates API

Sometimes you will need currency conversions in your Betty Blocks applications, this article will help you do this. In this article I will use the API located at https://fixer.io/

Step 1: Set up the Web Service

• Go to 'Tools' > 'Webservices'
• Create a new Web service
• Fill in the form with the following information:

Name: Exchange Rates API
Protocol: HTTP
Host: api.fixer.io
Authentication Type: None
Request Content-Type: JSON
Response Content-Type: JSON

• Create a new Webservice Endpoint
• Fill in the form for the new Endpoint with the following information

Name: Get the latest foreign exchange rates
HTTP method: GET
Path: "/latest"

• Save the Endpoint
• Perform a 'Run Test'
• When the service responds with JSON hit the 'Generate Custom Model'
• You're done setting up the Webservice.

Step 2: Set up the Datamodel

• Create a model 'Order' to store the example Orders, from here we would like to do the conversions. 
• Add a price property 'euro_value' and add a price property "Converted_price".
• You're all done setting up your datamodel. This also means we are now halfway, time for a break.

Step 3: Set up the Action

• Fill in the action form with following information:

Enabled: True
Description: Convert EURO pricing to USD
Model: Order
Triggers: Manual
Background: False

• Add the following action events
• HTTP Request, select Exchange Rates API and select the Endpoint. Hit Save.
• Add an Update event.
• Select the Order Object
• Add a Variable of the type ""Number with decimal Expression", name it "Conversion". Use the following expression in this variable:

var:record.euro_value * round(var:item.rates.USD, 4 )

The round expressions (with parameter 4) tells Betty Blocks to use a decimal scale of 4.

• Assign the variable to the property "Converted_price"
• Done building the action :)

Step 4: Build the View

We are not Betty Blocks noobs here. If you are integrating Web service I assume you've left your 'How can I set up a view'-days long behind you. I will help, but just with a few easy steps.

• Create a view for Order
• Add the "Convert" action to the order form

Step 5: Start converting

On the order form, fill in a euro pricing. Then press the Action Button to start converting, after conversion the "Converted_price" should be filled.