@sap/xsodata/lib/uri/checks/checkFilterOnAggregatedColumn.js

Expose data from a HANA database as OData V2 service with help of .xsodata files.

'use strict';

var Http400_BadRequest= require('../../utils/errors/http/badRequest');

module.exports = function checkFilterOnAggregatedColumn(context, callback) {

    var aggs = context.oData.dbSegmentLast.entityType.getAggregates();
    var filter = context.oData.systemQueryParameters.filter;

    if (aggs.length === 0 || !filter){
        return callback(null, context);
    }

    if(check(aggs, filter)){
        return callback(createError(), context);
    }

    return callback(null, context);

};

function createError() {
    var errorMessage = '$filter is not allowed for aggregated columns.';
    return new Http400_BadRequest(errorMessage);
}

function check(aggs, type){
    var violation = aggs.some(function(agg){
        return agg.column === type.property;
    });

    if (!violation){
        violation = type.getChildren().some(check.bind(null, aggs));
    }

    return violation;

}