Mongo Spring Search

Mongo Spring Search provides a query language to a MongoDB database.
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Mongo Spring Search

Content index

• What is this?
• Getting Started
  • Installation
• Usage
• Supported features
  • Filtering
  • Pagination
  • Sorting
  • Projection
  • Advanced queries
• Available options
  • Customize limit value
  • Specify casting per param keys
• Contributing
• License

What is this?

Mongo Spring Search provides a simple query language to perform advanced searches for your collections in MongoDB.

You could create custom repository methods to perform your searches. You could also use Mongo Spring Search to searching, sorting, pagination and combining logical operators.

Getting Started

Installation

Maven

Include the dependency to your project inside your pom.xml file

<dependency>
  <groupId>io.github.ajclopez</groupId>
  <artifactId>mongo-spring-search</artifactId>
  <version>1.0.4</version>
</dependency>

Gradle

Add implementation to your project in your build.gradle file

implementation 'io.github.ajclopez:mongo-spring-search:1.0.4'

Usage

Converts query into a MongoDB query object.

MongoSpringSearch.mss(String query)

MongoSpringSearch.mss(String query, Optional<Configuration> configuration)

Arguments

query: query string part of the requested API URL.

configuration: object for advanced configuration (See below) [optional].

You can add custom methods to your repository:

@Repository
public interface YourRepository extends MongoRepository<YourDocument, String>, YourCustomRepository {
}

To expand the Spring MongoRepository repository methods you can do it in the following way:

public interface YourCustomRepository {
	public List<YourDocument> findAll(String query);
}

In this class you can use Mongo Spring Search:

public class YourCustomRepositoryImpl implements YourCustomRepository {

	private MongoTemplate mongoTemplate;
	
	@Autowired
	public YourCustomRepositoryImpl(MongoTemplate mongoTemplate) {
		this.mongoTemplate = mongoTemplate;
	}
	
	@Override
	public List<YourDocument> findAll(String query) {
		return mongoTemplate.find(MongoSpringSearch.mss(query), YourDocument.class);
	}
}

Use it in your controller:

@GetMapping
public ResponseEntity<List<YourResponse>> yourFunctionNameHere(HttpServletRequest request) {
	return ResponseEntity.ok().body(yourRepository.findAll(request.getQueryString()));
}

Example

Query query = MongoSpringSearch.mss("status=sent&date>2020-01-06T14:00:00.000Z&author.firstname=Jhon&skip=50&limit=100&sort=-date&fields=id,date");

Supported features

Filtering

Operator	URI	Example
$eq	key=val	type=public
$ne	key!=val	status!=SENT
$gt	key>val	price>5
$gte	key>=val	price>=9
$lt	key<val	date<2020-01-01T14:00:00.000Z
$lte	key<=val	priority<=-5
$in	key=val1,val2	status=QUEUED,DEQUEUED
$nin	key!=val1,val2	status!=QUEUED,DEQUEUED
$exists	key	email
$exists	!key	!email
$regex	key=/value/<opts>	email=/@gmail\.com$/
$regex	key!=/value/<opts>	phone!=/^58/

Pagination

Useful to limit the number of records returned.

• Operator keys are skip and limit.
• Use limit operator to limit the number of records returned.
• Use skip operator to skip the specified number of records.

skip=20&limit=10

Sorting

Useful to sort returned records.

• Operator key is sort.
• It accepts a comma-separated list of fields.
• Use - prefixes to sort in descending order.
• Use + prefixes to sort in ascedending order.

sort=id,-date

Projection

Useful to limit fields to return in each records.

• Operator key is fields.
• It accepts a comma-separated list of fields.

fields=firstname,lastname,phone,email

Note:

• The _id field (returned by default).

Advanced queries

For more advanced usage (and, or logic operations), pass query filter as string with the logical operations, for example:

filter=(country=Mexico OR country=Spain) and gender=female

What operations are possible?

• Filtering operations.
• The AND/and operator.
• The OR/or operator.
• Parenthesis can be used for grouping.

Available options

You can use advanced options:

Configuration(Map<String, CastType> casters, Integer defaultLimit, Integer maxLimit)

• casters object to specify custom casters, key is the caster name, and value is a type (BOOLEAN, NUMBER, PATTERN, DATE, STRING).
• defaultLimit which contains custom value to return records.
• maxLimit which contains custom value to return a maximum of records.

Customize limit value

You can specify your own maximum or default limit value.

• defaultLimit: custom value to return records.
• maxLimit: custom value to return a maximum of records.

Configuration options = new Configuration(null, 10, 500);

MongoSpringSearch.mss("organizationId=123&skip=10&limit=1000", Optional.of(options));

Specify casting per param keys

You can specify how query parameter values are casted by passing an object.

• casters: object which map keys to casters.

Map<String, CastType> casters = new HashMap<String, CastType>();
casters.put("key1", CastType.STRING);
casters.put("key2", CastType.NUMBER);
casters.put("key3", CastType.STRING);
casters.put("key4", CastType.BOOLEAN);
		
Configuration options = new Configuration(casters, null, null);
MongoSpringSearch.mss("key1=VALUE&key2=10&key3=20&key4=true", Optional.of(options));

Contributing

Should you like to provide any feedback, please open up an Issue, I appreciate feedback and comments. Any contributions you make are greatly appreciated.

1. Fork the Project
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing-feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

This software is released under the MIT license. See LICENSE for more information.