Schema sample

Consider the following custom model

• A Customer has access to some DeliveryPoint nodes for a given period of time through the relation HAS_ACCESS(ContractStart, ContractEnd)
• A DeliveryPoint contains Meter nodes. A meter could be replace, this why the relation HAS_METER contains FromDate and ToDate properties.
• A Meter could be a combination of multiple Meter nodes through the relation HAS_METER
• A Meter reprensents a DataHubSource by the relation IS_SOURCE
• A DataHubVariable is the reflect of an alarm condition on a DeliveryPoint through the relation ALARM
• DataHubSite nodes are grouped by Region through IN_REGION relation

The corresponding schema is:

type Customer {
    Id: ID!
    Name: String!
    #A customer has access to some delivery points during a given period \n
    DeliveryPoints: [DeliveryPoint] @direct_relation(Type: "HAS_ACCESS" ContractStart:DateTime ContractEnd: DateTime)
}

type DeliveryPoint {
    Key: String!
    Ean: String!
    IsActive: Boolean
    ActiveFrom: DateTime
    ActiveTo: DateTime
    
    #DataHubSource nodes linked to this node through meters or submeters \n
    Sources: [DataHubSource] @traverse_relation(Type: "IS_SOURCE", Depth: 5)
    
    #Meters linked to this node \n
    Meters : [Meter] @direct_relation(Type: "HAS_METER" FromDate:DateTime ToDate: DateTime)
    
    #The alarm variable  \n
    AlarmVariable : [DataHubVariable] @direct_relation(Type: "ALARM" Direction: IN)
    
    #The value of ContractStart and ContractEnd from HAS_ACCESS relation \n
    CustomerAccessStart: DateTime @relation_field(RelationType: "HAS_ACCESS", FieldName: "ContractStart")
    CustomerAccessEnd: DateTime @relation_field(RelationType: "HAS_ACCESS", FieldName: "ContractEnd")
}

type  Meter {
    Name: String!
    Region: String
    #DataHubSource nodes directly linked to this node \n
    Sources: [DataHubSource] @direct_relation(Type: "IS_SOURCE")
    
    #Meters linked to this one (sub meters) \n
    SubMeters : [Meter] @direct_relation(Type: "HAS_METER")
    
    #The value of FromDate and ToDate from HAS_METER relation \n
    DeliveryPointMeterSince: DateTime @relation_field(RelationType: "HAS_METER", FieldName: "FromDate")
    DeliveryPointMeterUntil: DateTime @relation_field(RelationType: "HAS_METER", FieldName: "ToDate")
}

type Query {
    Customers : [Customer]
    Meters : [Meter]
    DeliveryPoints:[DeliveryPoint]
}

This schema allows these kind of queries.