Chapter 9: Building the Frontend with S3

1. Implement a Lambda function that takes the movie category as input and returns a list of movies that corresponds to that category.
   Answer:

func filter(category string)(events.APIGatewayProxyResponse, error) {
    ...

    filter: = expression.Name("category").Equal(expression.Value(category))
    projection: = expression.NamesList(expression.Name("id"), expression.Name("name"), expression.Name("description"))
    expr, err: = expression.NewBuilder().WithFilter(filter).WithProjection(projection).Build()
    if err != nil {
        return events.APIGatewayProxyResponse {
            StatusCode: http.StatusInternalServerError,
            Body: "Error while building DynamoDB expression",
        }, nil
    }

    svc: = dynamodb.New(cfg)
    req: = svc.ScanRequest( & dynamodb.ScanInput {
        TableName...