Using AWS API Gateway to build a patch method

Question

I am using API Gateway to build a patch method. In then Integration Request - Mapping Template i added:

{ "id": "$input.params('subscription-id')",
  "env": "$stageVariables['env']",
  "street": $input.json('street'),
  "address_name": $input.json('address_name'),
  "payment_day": $input.json('payment_day'),
 }

As a patch http method, the user's API is not required to pass all the parameters.

So if the user doesn't pass, for e.g. payment_day, the field is going to be ''. The '' can be a valid value field. So i have two options:

Put a NULL value on the payment_day field.
Remove the payment_day from JSON request.

Is it possible to do this on API Gateway Integration Request -Mapping Template? Does anyone has a workaround?

You could just pass the entire JSON body to your Lambda function (using $input.json('$') and sort it out in the Lambda function. — garnaat
– garnaat, Commented Mar 16, 2016 at 15:48

Bob Kinney · Accepted Answer · 2016-03-22 17:18:59Z

1

You can use Velocity Conditionals to only output optional values if present.

Alternately, as mentioned in comments, you can just pass the entire JSON body using $input.json('$') and handle the presence or lack there of inside your Lambda function.

answered Mar 22, 2016 at 17:18

Bob Kinney

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