objection-querystring-parser

This library builds on top of @bitovi/querystring-parser to transform CRUD-related querystrings into structured data for the Objection ORM.

• Installation
• Usage
  • Sort Parameters
  • Pagination Parameters
  • Fields Parameters
  • Include Parameters
  • Filter Parameters
• Example
• Further Documentation
• Home

Installation

npm install @bitovi/objection-querystring-parser

If you do not plan to use this library with Objection, please install @bitovi/querystring-parser.

Usage

• This parser returns an array of results that can be chained together
• Each result is an object that contains an fx, isNested and a parameters key in the format { fx: 'limit', isNested: false, parameters: [10] }
• fx is the name of the function to be chained to the query
• isNested is a boolean that indicates if a Query is Nested(AND, OR, NOT).
• parameters where isNested is true is an array of results each with its own fx, isNested and parameters.
• parameters where isNested is false is an array of parameters to be added to the function fx, the parameters value is an array that you would spread into your function fx.
• The results are used in the format Query[fx1](...parameters1)[fx2](...parameters2).
• This is better shown with an example here.

const querystringParser = require("@bitovi/objection-querystring-parser");

Sort Parameters

Reference: JSON:API - Sorting

const result = querystringParser.parse("sort=-date,name");
console.log(result);
// {
//   orm: "objection",
//   data: [
//     {
//       fx: "orderBy",
//       parameters: [[
//         { column: "date", order: "DESC" },
//         { column: "name", order: "ASC" },
//       ]],
//     }
//   ],
//   errors: [],
// };

Pagination Parameters

Reference: JSON:API - Pagination

const result = querystringParser.parse("page[number]=1&page[size]=10");
console.log(result);
// {
//   orm: "objection",
//   data: [
//     [
//       {
//         fx: "offset",
//         isNested: false,
//         parameters: [0],
//       },
//       {
//         fx: "limit",
//         isNested: false,
//         parameters: [10],
//       },
//     ],
//   ],
//   errors: [],
// };

Fields Parameters

Reference: JSON:API - Inclusion of Related Resources

const result = querystringParser.parse("fields[people]=id,name");
console.log(result);
// {
//   orm: "objection",
//   data: [
//     [
//       {
//         fx: "select",
//         isNested: false,
//         parameters: ["id","name"],
//       },
//     ],
//   ],
//   errors: [],
// };

Include Parameters

Reference: JSON:API - Inclusion of Related Resources

const result = querystringParser.parse("include=pets,dogs");
console.log(result);
// {
//   orm: "objection",
//   data: [
//     [
//       {
//         fx: "withGraphFetched",
//         isNested: false,
//         parameters: ["pets", "dogs"],
//       },
//     ],
//   ],
//   errors: [],
// };

Filter Parameters

const result = querystringParser.parse("filter=or(any(age,'10','20'),equals(name,'mike'))");
console.log(result);
// {
//   orm: "objection",
//   data: [
//     {
//       fx: "where",
//       isNested: true,
//       parameters: [
//         {
//           fx: "whereIn",
//           isNested: false,
//           parameters: ["age", [10, 20]],
//         },
//         {
//           fx: "orWhere",
//           parameters: ["name", "=", "mike"],
//         },
//       ],
//     },
//   ],
//   errors: [],
// };

const result = querystringParser.parse("filter=not(lessOrEqual(age,'10'),equals(name,null))");
console.log(result);
// {
//   orm: "objection",
//   data: [
//     {
//       fx: "whereNot",
//       isNested: true,
//       parameters: [
//         {
//           fx: "where",
//           isNested: false,
//           parameters: ["age", "<=", 10],
//         },
//         {
//           fx: "whereNull",
//           parameters: ["name"],
//         },
//       ],
//     },
//   ],
//   errors: [],
// };

Note: Database Validations should be done before or after passing the query to the library before the database call is made.

Example

A more practical example on how to use this library in your project can be found here.

Further Documentation

This library builds on @bitovi/querystring-parser. See its documentation for more on using querystring-parser.