How to use Dgraph to design temporal knowledge graph?

Users Dgraph
2

Hi @wanglj
In my opinion a more flexible structure is to have a type for companies and one specific type for job history. I’m using GraphQL type here and you can use dql equivalent:

type Person {
  PersonID: ID!
  name: String
  workHistory: [WorkHistory]
}

type Company {
  CompanyID: ID!
  name: String!
  workHistories: [WorkHistory]
}

type WorkHistory {
  WorkHistoryID: ID!
  company: Company!  @hasInverse(field: "workHistories")
  person: Person @hasInverse(field: "workHistory")
  date: Date
}

Now with this schema I do not need to store which work place is the first and I can get the result using a query.

What you can get easy with this structure(LinkedIn Example):
1- First place somebody worked at:

query {
  getPerson(PersonID: "0x2") {
     name
     workHistories(first: -1) {
        WorkHistoryID
        company {
          CompanyID
          name
        }
     }
  }
}

2- Workers of specific company:

query {
  getCompany(ComponayID: "0x1") {
    CompanyID
    workHistories {
        WorkHistoryID
        person {
            name
         }
     }
  }
}
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