betterddb/dist/operator.js

A definition-based DynamoDB wrapper library that provides a schema-driven and fully typesafe DAL.

export function getOperatorExpression(operator, nameKey, valueKey, secondValueKey) {
    switch (operator) {
        case "==":
            return `${nameKey} = ${valueKey}`;
        case "!=":
            return `${nameKey} <> ${valueKey}`;
        case "<":
            return `${nameKey} < ${valueKey}`;
        case "<=":
            return `${nameKey} <= ${valueKey}`;
        case ">":
            return `${nameKey} > ${valueKey}`;
        case ">=":
            return `${nameKey} >= ${valueKey}`;
        case "begins_with":
            return `begins_with(${nameKey}, ${valueKey})`;
        case "between":
            if (!secondValueKey) {
                throw new Error("The 'between' operator requires two value keys");
            }
            return `${nameKey} BETWEEN ${valueKey} AND ${secondValueKey}`;
        case "contains":
            return `contains(${nameKey}, ${valueKey})`;
        default:
            throw new Error("Unsupported operator");
    }
}
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