Es Mapping TS

This library is used to generate elasticsearch mapping through typescript decorators

Installation

npm install es-mapping-ts --save

Peer dependencies

This package only work with @elastic/elasticsearch

Version

tested with

• elasticsearch 7
• elasticsearch 6
• elasticsearch 5

Examples

Create the mapping

import { EsEntity, EsField } from 'es-mapping-ts';
import { ObjectEntity } from './object.entity';
import { NestedEntity } from './nested.entity';

@EsEntity({
  index: 'master',
  type: 'masterType'
})
export class MasterEntity {

  @EsField({
    type : 'text'
  })
  name?: string;

  @EsField({
    type: 'text',
    copy_to : 'name'
  })
  firstname: string;

  @EsField({
    type: 'text',
    copy_to : 'name'
  })
  lastname: string;

  @EsField({
    type: 'join',
    relations: { 'master': 'submaster' }
  })
  master: Array<MasterEntity>;

  @EsField({
    type: 'object',
    fieldClass: ObjectEntity
  })
  objects: Array<MasterEntity>;

  @EsField({
    type: 'nested',
    fieldClass: NestedEntity
  })
  nested: Array<NestedEntity>;
}

import { EsEntity, EsField } from 'es-mapping-ts';

@EsEntity({
  index: 'nested'
})
export class NestedEntity {

  @EsField({
    type: 'text',
  })
  name: string;

  @EsField({
    type: 'integer'
  })
  montant: number;
}

import { EsEntity, EsField } from 'es-mapping-ts';

// This es entity is only here for field mapping,
// it's not supposed to have is own index
@EsEntity()
export class ObjectEntity {

  @EsField({
    type: 'text',
    analyzer : 'whitespace'
  })
  name: string;

  @EsField({
    type: 'integer',
  })
  age: number;
}

Get the generated mappings

Simply call the "uploadMappings" function

import { EsMappingService } from 'es-mapping-ts';
import { Client } from '@elastic/elasticsearch';

const esClient = new Client({
  host: 'http://localhost:9200',
  log : 'info'
});

// Upload the mapping
const mappings = EsMappingService.getInstance().uploadMappings(esClient);

only none readonly entity will be uploaded

or do it yourself

import { EsMappingService } from 'es-mapping-ts';

//List of ready to use generated mapping
const mappings = EsMappingService.getInstance().getMappings();

Bluebird.each(mappings, async (mapping) => {
    //create index
    await esclient.indices.create({ index: mapping.index  });

    //create mapping
    await esclient.indices.putMapping(mapping);
});

Inheritance

You can also extend EsMapping

export class AbstractEntity {

  @EsField({
    type: 'text',
  })
  abstractName: string;

  @EsField({
    type: 'text',
  })
  overridableName: string;
}

@EsEntity({
  index: 'concret',
  type: 'typeConcret'
})
export class ConcretEntity extends AbstractEntity {

  @EsField({
    type: 'text'
  })
  concretName: string;


  @EsField({
    type: 'text',
    null_value : 'undefined'
  })
  overridableName: string;
}

Using mixins

You can add mixins to your entities by declaring an entity like so:

@EsEntity({ mixins: [BaseMixin] })
export class SomeEntity {
   @EsField({
        type: "text",
    })
    name: string;
}

The mixin class looks like:

@EsEntity()
export class BaseMixin {
    @EsField({
       type: "keyword"
    })
    id: string;

    @EsField({
        name: "start_date",
        type: "date"
    })
    startDate: Date;

    @EsField({
        name: "end_date",
        type: "date"
    })
    endDate: Date;
}

SomeClass will now have a mapping like:

{
    "body": {
        "properties": {
            "name": {
                "type": "text",
            },
            "id": {
                "type": "keyword",
            },
            "start_date": {
                "name": "start_date",
                "type": "date",
            },
            "end_date": {
                "name": "end_date",
                "type": "date",
            },
        }
    }
}

Decorators

@EsEntity

Param	Type	Description
index	string	Allow you to define the index name
type	string	Allow you to define the index type
readonly	boolean	Define if the mapping must be uploaded when using uploadMappings function
mixins	Array	Allow you to compose with one or more EsEntities, see "Using mixins"

@EsField

Param	Type	Description
type	string	Allow you to define the type of the index
name	string	Allow you to define the name of the property if different from the property name
dynamic	boolean	Allow you to define if the field can accept additional properties
analyzer	string	Allow you to define the elasticsearch analyzer
fields	string	Allow you to define the elasticsearch fields
format	string	Allow you to define the format (ie for date field)
enabled	boolean	Allow you to enable ou disable the field
null_value	string	Allow you to define the null value of the field
copy_to	string	Allow you to copy the field value into a group field for _search
relations	string	Define the releation for a join type
fieldClass	string	Class used to get the properties of the nested or object array type

Additional properties are allowed, allowing you to manage other elasticsearch properties

How to dev

test en build

# launch unit testing
npm run test 

# build
npm run build

This project is also managed by travis for CI

release

npm run build
npm run test

mkdir release
cp -r dist release
cp LICENSE release
cp README.md release
cp package.json release #change version

cd relese
npm publish

License

---

MIT