Example of a mutation resolver which evicts the entry from the AppSync cache

serverless-blog-stack.ts

// updateBlog mutation with cache invalidation
blogTableDataSource.createResolver({
  typeName: "Mutation",
  fieldName: "updateBlog",
  // this is an example of a vtl template generated with the helper methods
  requestMappingTemplate: appsync.MappingTemplate.dynamoDbPutItem(
    appsync.PrimaryKey.partition("id").is("input.id"),
    appsync.Values.projecting("input")
  ),
  // this is an example of an inline vtl response template (you can also pull in from a file)
  responseMappingTemplate: appsync.MappingTemplate.fromString(`
  #set($cachingKeys = {})
  $util.qr($cachingKeys.put("context.arguments.id", $context.arguments.input.id))
  $extensions.evictFromApiCache("Query", "getBlogNoDax", $cachingKeys)

  $util.toJson($context.result)
  `),
});