```mermaid
flowchart LR
    DBConnect["`**Mongo Connect**
    - create connection string
    - establish connection`"]

    DBRead["`**Mongo Read**
    - read database
    - get fields without attribute 'companies'`"]

    NER["`**NERService**
    - process news article
    - get entities`"]

    DBUpdate["`**Mongo Update Documents**
    - update processed documents
    - add an attribute 'companies'`"]

    id1[["`**NERSpacy**
    Named Entitiy Recognition with spaCy`"]]

    id2[["`**NERCompanyList**
    Named Entitiy Recognition by comparing text with list`"]]

    id3[["`**NERTransformer**
    Named Entitiy Recognition with transformer`"]]

    DBConnect-->DBRead-->NER
    NER--select service-->id1
    NER--select service-->id2
    NER--select service-->id3

    id1-->DBUpdate
    id2-->DBUpdate
    id3-->DBUpdate


```