Reusable DynamoDb Function to Update Multiple Fields at Once

updateUserFields.ts

import { DateTime } from "luxon";
import {
  AttributeValue,
  DynamoDBClient,
  QueryCommand,
  UpdateItemCommand,
} from "@aws-sdk/client-dynamodb";
const dynamoDBClient = new DynamoDBClient({});

interface UserFields {
  [key: string]: string | boolean | number;
}

export const updateUserFields = async (
  userId: string,
  fields: UserFields
): Promise<boolean> => {

  const currentDateTime = DateTime.now();
  const now = currentDateTime.toFormat("MM/dd/yy hh:mm:ss a");
  const userTable = "users";

  try {
    // Construct update expression
    const updateExpressions = [];
    Object.keys(fields).forEach((field: string) => {
      updateExpressions.push(`#${field} = :${field}`);
    });
    updateExpressions.push("#updated_at = :updated_at");
    const updateExpression = "SET " + updateExpressions.join(", ");

    const expressionAttributeNames: Record<string, string> = {};
    const expressionAttributeValues: Record<string, AttributeValue> = {};

    // Construction attribute names and values
    Object.keys(fields).forEach((field: string) => {
      const value = fields[field];
      const namePlaceholder = `#${field}`;
      const valuePlaceholder = `:${field}`;
      expressionAttributeNames[namePlaceholder] = field;
      if (typeof value === "boolean") {
        expressionAttributeValues[valuePlaceholder] = { BOOL: value };
      } else if (typeof value === "number") {
        expressionAttributeValues[valuePlaceholder] = { N: value.toString() };
      } else if (typeof value === "string") {
        expressionAttributeValues[valuePlaceholder] = { S: value };
      }
      // Add support for other data types...
    });
    expressionAttributeNames["#updated_at"] = "updated_at";
    expressionAttributeValues[":updated_at"] = { S: now };

    const updateCommand = new UpdateItemCommand({
      TableName: userMetadataTableName,
      Key: { user_id: { S: userId } },
      UpdateExpression: updateExpression,
      ExpressionAttributeNames: expressionAttributeNames,
      ExpressionAttributeValues: expressionAttributeValues,
    });

    await dynamoDBClient.send(updateCommand);

    return true;
  } catch (error: any) {
    // Your own error handling here...
  }
};