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Overview

Vali-Flow.NoSql.DynamoDB translates a ValiFlow<T> expression tree into a DynamoDB FilterExpression string together with the ExpressionAttributeNames and ExpressionAttributeValues dictionaries required by ScanRequest and QueryRequest.

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The package depends only on AWSSDK.DynamoDBv2. It is a pure query builder with no connection or execution concerns.

Installation​

dotnet add package Vali-Flow.NoSql.DynamoDB

Vali-Flow.Core is included as a transitive dependency.

Quick Start​

using Amazon.DynamoDBv2;
using Amazon.DynamoDBv2.Model;
using Vali_Flow.Core.Builder;
using Vali_Flow.NoSql.DynamoDB.Extensions;
using Vali_Flow.NoSql.DynamoDB.Models;

var filter = new ValiFlow<Order>()
    .EqualTo(x => x.Status, "Active")
    .GreaterThan(x => x.Total, 100m);

DynamoFilterExpression f = filter.ToDynamoDB();

var request = new ScanRequest
{
    TableName                 = "Orders",
    FilterExpression          = f.FilterExpression,
    ExpressionAttributeNames  = f.ExpressionAttributeNames.ToDictionary(),
    ExpressionAttributeValues = f.ExpressionAttributeValues.ToDictionary()
};

ScanResponse response = await client.ScanAsync(request);

More Examples​

var filter = new ValiFlow<User>()
    .IsNotNullOrEmpty(x => x.Email)
    .ToDynamoDB();