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Mongo-Client

this project use for connect to mongodb service and implement the repository layer in crud project

Requirement

The library works with Java 8+, ladder Core 1.0.1+ and implemented Crud Project

Core

Crud

MongoTemplate to provide below feature

• Implementation of GeneralRepository for CRUD Project
• Sequence service
• Modify fieldName dynamically before save and after fetch even in runtime
• relocate nested field of a map object dynamically even in runtime which means before save and after fetch
• Change field name by content of desired variable

Hello World

Example of default implementation of GeneralRepository

@Component
public class CostHeaderGeneralRepository extends MongoRepositoryServiceImpl<CostHeader, ObjectId> {

}

@Repository
public interface CostHeaderRepository extends MongoRepository<CostHeader, ObjectId> {
}

if you want to update record without losing previous field ,use updateFields method

@Component
public class CostHeaderService {
    @Autowire
    CostHeaderGeneralRepository costHeaderGeneralRepository;

    public void updateFields(ObjectId id, CostHeader costHeader) {
        costHeaderGeneralRepository.updateField(id, costHeader);
    }

}

if MongoFieldMapper exists, SimpleMongoRepository will call it before and after CRUD in MongoDB, otherwise continues to its business

for providing Sequence ,Move and Rename features, you must generate below bean, This bean allows you to rename and relocate and change fields dynamically

@Component
public class CostHeaderMapper extends MongoFieldMapper<CostHeader> {

}

if you want to modify filed of document before save or after fetch ,follow the below example

public class MyService{
    @Autowire
    CostHeaderMapper costHeaderMapper;
    public void customFunc(){
        costHeaderMapper.getVariableGeneratorFields().put("dynamicFields.name".split(com.nicico.mongoclient.mapper.MongoFieldMapper.MONGO_FIELD_NAME_SEPARATOR)
                ,
                new ValueModifier<Object>() {
                    @Override
                    public void before(Object o, org.bson.Document doc) {

                    }

                    @Override
                    public void after(org.bson.Document doc) {

                    }
                }
        );
    }

}

Generate Sequence Number with specific sequenceName and set it to a document before saving.

@Document
public class CostHeader {

    @Sequence(name = "Cost_Header_Number")
    public Long number;

    public void setNumber(Long number) {
        this.number = number;
    }
}

original document

{
  "number": null
}

persisted document in MongoDB

{
  "number": 80
}

if you need sequence number for your business , you can take it with below method.

public class SequenceUtil {
    @AutoWired
    SequenceGeneratorService sequenceGeneratorService;

    public Long getNextSequence(String seqName) {
        return sequenceGeneratorService.generateSequence();
    }
}

MongoTemplate let you set fields name fixed,

if you need setting fields name with content of other field, you can use below example

public class CostRow {
    private String type;
    @FieldName(name = "type")
    private Map<String, Object> dynamicFields;
}

original document

{
  "type": "train",
  "dynamicFields": {
    "name": "Green Train"
  }
}

persisted document in MongoDB

{
  "type": "train",
  "train": {
    "name": "Green Train"
  }
}

if you need to relocate nested fields of a map to everywhere in a document, you can use RelocateField annotation

public class CostRow {
    private String type;
    @RelocateField(source = {"staticFields", "dynamicFields.name"}, target = {"stat", "name"})
    private Map<String, Object> dynamicFields;
}

original document

{
  "type": "train",
  "staticFields": {
    "price": 1000
  },
  "dynamicFields": {
    "number": 80,
    "name": "Green Train"
  }
}

persisted document in MongoDB

{
  "type": "train",
  "stat": {
    "price": 1000
  },
  "name": "Green Train",
  "dynamicFields": {
    "number": 80
  }
}