dynamodb-fast-access/dist/db/ExpressionCreator.js

Default CRUD operations for managing AWS DynamoDB table items in an easy-to-extend structure.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class ExpressionCreator {
    static getUpdateExpression(attributes) {
        const attrib = attributes;
        let expression = '';
        Object.keys(attrib).forEach(field => {
            if (attrib[field] !== undefined) {
                if (expression !== '')
                    expression += ', ';
                expression += '#' + field + ' = ' + ':' + field;
            }
        });
        return expression;
    }
    static getUpdateExpressionRemove(attributes) {
        let expression = '';
        for (const attribute of attributes) {
            if (attribute !== '') {
                if (expression !== '')
                    expression += ', ';
                expression += '#' + attributes;
            }
        }
        return expression;
    }
    static getFilterExpression(attributes) {
        const attrib = attributes;
        let expression = '';
        Object.keys(attrib).forEach(field => {
            if (attrib[field] !== undefined) {
                if (expression !== '')
                    expression += ' and ';
                expression += '#' + field + ' = ' + ':' + field;
            }
        });
        return expression;
    }
    static getExpressionAttributeValues(attributes) {
        const attrib = attributes;
        const expression = {};
        Object.keys(attrib).forEach(field => {
            if (attrib[field] !== undefined) {
                expression[':' + field] = attrib[field];
            }
        });
        return expression;
    }
    static getExpressionAttributeNames(attributes) {
        const attrib = attributes;
        const expression = {};
        Object.keys(attrib).forEach(field => {
            if (attrib[field] !== undefined) {
                expression['#' + field] = field;
            }
        });
        return expression;
    }
}
exports.ExpressionCreator = ExpressionCreator;