odatafy-mongodb/dist/src/selectGenerator.js

convert oData requests through odatafy to MongoDB queries

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.generateProjectStage = exports.generateProjectFromSelectExpr = void 0;
var odatafy_parser_1 = require("odatafy-parser");
/**
 * Get a MongoDB project stage based on oData select parameter
 * @param expr value of select url parameter
 * @returns MongoDB aggregation pipline project stage
 */
function generateProjectFromSelectExpr(expr) {
    var select = odatafy_parser_1.selectParser.parse(expr);
    return generateProjectStage(select);
}
exports.generateProjectFromSelectExpr = generateProjectFromSelectExpr;
/**
 * Get MongoDB project stage based on a parsed select expression
 * @param select ast parsed select from a select expression
 * @returns MongoDB aggregation pipline project stage
 */
function generateProjectStage(selectNode) {
    var projection = {};
    //iterate through selectnode
    selectNode.value.forEach(function (selectPathNode) {
        var extractedPaths = [];
        if (selectPathNode.nodeType == odatafy_parser_1.NodeTypes.SelectPathNode) {
            selectPathNode.value.forEach(function (selectItemNode) {
                //only include identifier nodes
                if (selectItemNode.nodeType == odatafy_parser_1.NodeTypes.SelectIdentifierNode) {
                    extractedPaths.push(selectItemNode.value);
                }
            });
            var path = extractedPaths.join('.');
            projection[path] = 1;
        }
    });
    return {
        '$project': projection
    };
}
exports.generateProjectStage = generateProjectStage;