afas-filter-builder

A TypeScript library for building filters and query parameters for AFAS GetConnectors. This library provides a fluent API to construct filters, sorting, and pagination for AFAS API requests.

Features

• Fluent API: Easily chain methods to build complex filters.
• Type-Safe: Leverages TypeScript generics to ensure type safety.
• Flexible Filtering: Add filters with various operators like EqualTo, Contains, NotEqualTo, etc.
• Sorting: Add sorting with ascending or descending order.
• Pagination: Support for skip and take parameters.

Installation

Install the library using npm:

npm install afas-filter-builder

Usage

Basic Example

import { AfasFilter } from "afas-filter-builder";
import { Operator } from "afas-filter-builder/src/operator";
import { OrderBy } from "afas-filter-builder/src/order-by";

type ExampleType = {
	id: number;
	name: string | null;
	isActive: boolean;
};

const filter = AfasFilter.create<ExampleType>()
	.skip(10)
	.take(20)
	.addFilter("id", 123, Operator.EqualTo)
	.addFilter("name", "test", Operator.Contains)
	.addOrderBy("id", OrderBy.Ascending)
	.buildURLSearchParams();

console.log(filter.toString());
// Output: skip=10&take=20&filterfieldids=id,name&filtervalues=123,test&operatortypes=1,6&orderbyfieldids=id

API Reference

AfasFilter.create<T>()

Creates a new instance of AfasFilter for the specified type T.

.skip(skip: number): this

Sets the number of records to skip.

.take(take: number): this

Sets the number of records to take.

.addFilter<K extends keyof T>(field: K, value: T[K], operator: Operator = Operator.EqualTo): this

Adds a filter for the specified field, value, and operator.

• field: The field to filter on.
• value: The value to filter by.
• operator: The operator to use (default is EqualTo).

.addOrderBy<K extends keyof T>(field: K, order: OrderBy): this

Adds a sorting order for the specified field.

• field: The field to sort by.
• order: The sorting order (OrderBy.Ascending or OrderBy.Descending).

.buildURLSearchParams(): URLSearchParams

Builds and returns the query parameters as a URLSearchParams object.

Operators

The following operators are available in the Operator enum:

• EqualTo
• GreaterThanOrEqualTo
• LessThanOrEqualTo
• GreaterThen
• LessThen
• Contains
• NotEqualTo
• IsEmpty
• IsNotEmpty
• StartsWith
• DoesntContain
• DoesntStartWith
• EndsWith
• DoesntEndWith
• QuickFilter

Sorting

The OrderBy enum provides the following options:

• OrderBy.Ascending
• OrderBy.Descending

Advanced Example

const filter = AfasFilter.create<ExampleType>()
	.addFilter("isActive", true, Operator.EqualTo)
	.addFilter("name", null, Operator.IsEmpty)
	.addOrderBy("name", OrderBy.Descending)
	.buildURLSearchParams();

console.log(filter.toString());
// Output: filterfieldids=isActive,name&filtervalues=true,null&operatortypes=1,8&orderbyfieldids=-name

Running Tests

This project uses Jest for testing. To run the tests, use:

npm test

License

This project is licensed under the MIT License.