meilisearch-helper

A helper library for meilisearch-js that provides convenient utility methods to simplify common operations and enhance your Meilisearch experience.

Installation

npm install meilisearch-helper

Usage

Filter

There are two ways to build a MeiliSearch filter:

1. Use the buildMeiliSearchFilter function to build a filter from a MongoDB-style filter object.
2. Use the MeiliSearchFilterBuilder class to build a filter with a fluent API.

buildMeiliSearchFilter

import { buildMeiliSearchFilter } from 'meilisearch-helper';

type FilterableAttributes = 'name' | 'age' | 'isStudent';

const filter = buildMeiliSearchFilter<FilterableAttributes>({
  $or: [
    { $or: [{ name: 'John' }, { name: 'Doe' }] },
    { $and: [{ age: { $gt: 18 } }, { isStudent: true }] },
  ],
  age: { $lt: 30 },
  $geoRadius: {
    lat: 45.472735,
    lng: 9.184019,
    distanceInMeters: 2000,
  },
});

console.log(filter);
// => ((name = "John" OR name = "Doe") OR age > 18 AND isStudent = true) AND age < 30 AND _geoRadius(45.472735, 9.184019, 2000)

Supported operators:

• $eq: Equal, e.g. { name: { $eq: 'John' } } => name = "John" or { name: 'John' } => name = "John"
• $ne: Not equal, e.g. { name: { $ne: 'John' } } => name != "John"
• $gt: Greater than, e.g. { age: { $gt: 18 } } => age > 18
• $gte: Greater than or equal, e.g. { age: { $gte: 18 } } => age >= 18
• $lt: Less than, e.g. { age: { $lt: 18 } } => age < 18
• $lte: Less than or equal, e.g. { age: { $lte: 18 } } => age <= 18
• $in: In, e.g. { name: { $in: ['John', 'Doe'] } } => name IN ["John", "Doe"] or { name: ['John', 'Doe'] } => name IN ["John", "Doe"]
• $nin: Not in, e.g. { name: { $nin: ['John', 'Doe'] } } => name NOT IN ["John", "Doe"]
• $exists: Exists, e.g. { name: { $exists: true } } => name EXISTS or { name: { $exists: false } } => name NOT EXISTS
• $empty: Empty, e.g. { name: { $empty: true } } => name IS EMPTY or { name: { $empty: false } } => name IS NOT EMPTY
• $or: Or, e.g. { $or: [{ name: 'John' }, { name: 'Doe' }] } => (name = "John" OR name = "Doe")
• $and: And, e.g. { $and: [{ age: { $gt: 18 } }, { isStudent: true }] } => age > 18 AND isStudent = true
• $geoRadius: Geo radius, e.g. { $geoRadius: { lat: 45.472735, lng: 9.184019, distanceInMeters: 2000 } } => _geoRadius(45.472735, 9.184019, 2000)
• $geoBoundingBox: Geo bounding box, e.g. { $geoBoundingBox: { topRight: { lat: 45.472735, lng: 9.184019 }, bottomLeft: { lat: 45.472735, lng: 9.184019 } } } => _geoBoundingBox([45.472735, 9.184019], [45.472735, 9.184019])

More examples can be found in the tests.

MeiliSearchFilterBuilder

Simple example:

import { MeiliSearchFilterBuilder } from 'meilisearch-helper';

type Person = {
  name: string;
  age: number;
  isStudent: boolean;
};
type FilterableAttributes = keyof Person;

function buildFilter(query: Partial<Person>) {
  let builder = new MeiliSearchFilterBuilder<FilterableAttributes>();

  if (query.name) {
    builder = builder.where('name', '=', query.name); // MeiliSearchFilterBuilder is immutable, you must re-assign!
  }

  if (query.age) {
    builder = builder.where('age', '=', query.age);
  }

  if (query.isStudent) {
    builder = builder.where('isStudent', '=', query.isStudent);
  }

  return builder.build();
}

console.log(buildFilter({ name: 'John', age: 20, isStudent: true }));
// => name = "John" AND age = 20 AND isStudent = true

Complex example:

import { MeiliSearchFilterBuilder } from 'meilisearch-helper';

type FilterableAttributes = 'name' | 'age' | 'isStudent';

// eb is a function to build a simple filter expression, more details below
const filter = new MeiliSearchFilterBuilder<FilterableAttributes>()
  .where((eb) =>
    eb.or([
      eb.or([eb('name', '=', 'John'), eb('name', '=', 'Doe')]),
      eb.and([eb('age', '>', 18), eb('isStudent', '=', true)]),
    ]),
  )
  .where('age', '<', 30)
  .where((eb) => eb.geoRadius(45.472735, 9.184019, 2000))
  .build();

console.log(filter);
// => ((name = "John" OR name = "Doe") OR age > 18 AND isStudent = true) AND age < 30 AND _geoRadius(45.472735, 9.184019, 2000)

eb (expression builder): A function to build a simple filter expression.

• eb(lhs: FilterableAttributes, operator: FilterBuilderOperator, rhs: BaseValueTypes): string: Build a simple filter expression, e.g. eb('age', '>', 18) => age > 18
• eb.or(expressions: string[]): string: Combine multiple expressions with OR, e.g. eb.or([eb('age', '>', 18), 'isStudent = true']) => (age > 18 OR isStudent = true)
• eb.and(expressions: string[]): string: Combine multiple expressions with AND, e.g. eb.and([eb('age', '>', 18), 'isStudent = true']) => age > 18 AND isStudent = true
• eb.geoRadius(lat: number, lng: number, distanceInMeters: number): string: Build a geo radius filter expression, e.g. eb.geoRadius(45.472735, 9.184019, 2000) => _geoRadius(45.472735, 9.184019, 2000)
• eb.geoBoundingBox(topRight: { lat: number; lng: number }, bottomLeft: { lat: number; lng: number }): string: Build a geo bounding box filter expression, e.g. eb.geoBoundingBox({ lat: 45.472735, lng: 9.184019 }, { lat: 45.472735, lng: 9.184019 }) => _geoBoundingBox([45.472735, 9.184019], [45.472735, 9.184019])

supported operators:

• =: Equal, e.g. .where('name', '=', 'John') => name = "John"
• !=: Not equal, e.g. .where('name', '!=', 'John') => name != "John"
• >: Greater than, e.g. .where('age', '>', 18) => age > 18
• >=: Greater than or equal, e.g. .where('age', '>=', 18) => age >= 18
• <: Less than, e.g. .where('age', '<', 18) => age < 18
• <=: Less than or equal, e.g. .where('age', '<=', 18) => age <= 18
• in: In, e.g. .where('name', 'in', ['John', 'Doe']) => name IN ["John", "Doe"]
• nin: Not in, e.g. .where('name', 'nin', ['John', 'Doe']) => name NOT IN ["John", "Doe"]
• exists: Exists, e.g. .where('name', 'exists', true) => name EXISTS or .where('name', 'exists', false) => name NOT EXISTS
• empty: Empty, e.g. .where('name', 'empty', true) => name IS EMPTY or .where('name', 'empty', false) => name IS NOT EMPTY

More examples can be found in the tests.

Sort

buildMeiliSearchSort

Build a MeiliSearch sort from an object.

import { buildMeiliSearchSort } from 'meilisearch-helper';

type SortableAttributes = 'name' | 'age';

const sort = buildMeiliSearchSort<SortableAttributes>({
  name: 1,
  age: -1,
  _geoPoint: { lat: 48.8561446, lng: 2.2978204, direction: 1 },
});

console.log(sort);
// => [ "name:asc", "age:desc", "_geoPoint(48.8561446, 2.2978204):asc" ]

More examples can be found in the tests.

Supported directions:

• Ascending: 1, asc, ascending
• Descending: -1, desc, descending

License

MIT