How to Implement Multi-Condition Filtering in AWS SDK for Go DynamoDB?

Multi-Condition Filtering for AWS SDK for Go DynamoDb with Add Multiple Conditions to FilterExpression

Problem:
Users need a way to filter DynamoDB scans using multiple conditions within the expression builder. The initial implementation overwrites the previous condition, limiting multi-condition filtering capabilities.

Resolution:
Using the ConditionBuilder struct, developers can add multiple conditions by utilizing the And, Or, and Not methods. Here's an example:

<code class="go">package main

import (
    "fmt"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/dynamodb"
    "github.com/aws/aws-sdk-go/service/dynamodb/expression"
)

func main() {
    sess := session.Must(session.NewSessionWithOptions(
        session.Options{
            SharedConfigState: session.SharedConfigEnable,
        },
    ))

    svc := dynamodb.New(sess, &aws.Config{
        Region: aws.String("us-west-1"),
    })

    cond1 := expression.Name("foo").Equal(expression.Value(5))
    cond2 := expression.Name("bar").Equal(expression.Value(6))
    expr, err := expression.NewBuilder().
        WithCondition(cond1.And(cond2)).
        Build()
    if err != nil {
        fmt.Println(err)
    }

    input := &dynamodb.ScanInput{
        ExpressionAttributeNames:  expr.Names(),
        ExpressionAttributeValues: expr.Values(),
        FilterExpression:          expr.Filter(),
        TableName:                 aws.String("Music"),
    }

    _, err = svc.Scan(input)
    if err != nil {
        fmt.Println(err)
    }
}</code>

Documentation:

You can refer to the official documentation for more information on multi-condition filtering with ExpressionBuilder: [https://pkg.go.dev/github.com/aws/aws-sdk-go/aws/session/credentials#Values](https://pkg.go.dev/github.com/aws/aws-sdk-go/service/dynamodb/expression#And)

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