query-strings-parser/lib/mapper/ordination.js

Middleware to transform query strings in a format that is recognized by the MongoDB, MySQL and other databases...

'use strict'

function ordination(query, options) {
    const result = {}
    if (query.sort) {
        if (query.sort instanceof Array) {
            query.sort.forEach(function (elem) {
                Object.assign(result, processQuery(elem))
            })
            return validate_sort(result, options.default.sort)
        }
        return validate_sort(processQuery(query.sort), options.default.sort)
    }
    return options.default.sort
}

function processQuery(query) {
    const result = {}
    query = query.replace(/([^\w\s,.-])|(\s{1,})/gi, '')
    query.split(',').forEach(function (elem) {
        elem = elem.trim()
        if (elem[0] === '-') result[elem.substr(1)] = -1
        else result[elem] = 1
    })
    return result
}


function validate_sort(_values, _default) {
    return {
        ..._default, ..._values
    }
}

exports = module.exports = {
    sort: ordination
}