如何在AppSync解析器中使用多个过滤器表达式

const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB.DocumentClient();

exports.handler = async (event) => {
  const filters = {
    filter1: {
      field: 'name',
      operator: 'eq',
      value: 'John'
    },
    filter2: {
      field: 'age',
      operator: 'gt',
      value: 18
    }
  };

  const params = {
    TableName: 'yourTableName',
    FilterExpression: buildFilterExpression(filters),
    ExpressionAttributeValues: buildExpressionAttributeValues(filters)
  };

  try {
    const result = await dynamodb.scan(params).promise();
    return result.Items;
  } catch (error) {
    console.error(error);
    throw new Error('Error querying data');
  }
};

function buildFilterExpression(filters) {
  let filterExpression = '';
  Object.keys(filters).forEach((key, index) => {
    const filter = filters[key];
    filterExpression += `${filter.field} ${filter.operator} :value${index}`;
    if (index < Object.keys(filters).length - 1) {
      filterExpression += ' AND ';
    }
  });
  return filterExpression;
}

function buildExpressionAttributeValues(filters) {
  let expressionAttributeValues = {};
  Object.keys(filters).forEach((key, index) => {
    const filter = filters[key];
    expressionAttributeValues[`:value${index}`] = filter.value;
  });
  return expressionAttributeValues;
}