CherryPicking

We famously call such attributes as "CherryPicked Attributes". They are "Cherry Picked" from the attributes of some other defined models.

CherryPicked attributes are defined as type of Attribute. The value is defined as the name of an attribute from another model. For example, <Attribute name="SensorVendorSysId" value="VendorInfo.VendorSysId"/>.

In this example the DataModel SensorVendorInfo contains SensorVendorSysId, SensorVendorName defined and available from DataMdoel VendorInfo.

Unique Constraint Violation Error

#
DataModel(Name: "VendorInfo"):
  Sid(Name: "VendorSysId")
  String(Name: "VendorName")
  String(Name: "VendorTitle")
  PostalAddress(Name: "VendorAddress")
  String(Name: "DeviceTypes", Cardinality: "0..m")
  Unique(Name: "UniqueVendorName", Value: "VendorName")
DataModel(Name: "SensorVendorInfo"):
   Attribute(Name: "SensorVendorSysId", value: "VendorInfo.VendorSysId")
   Attribute(Name: "SensorVendorName", value: "VendorInfo.VendorName")

Once VendorInfo Data is created using Create TQL Query. The SensorVendorInfo will automatically have the Data as well.

Create VendorInfo Data:

Create Vendor Info

#
Query:
  Create:
    VendorInfo:
      vendorName: Phidget
      vendorTitle: "Sensor Provider"
      vendorAddress:
        Street: "123 TQL Way"
        City: Sunnyvale
        Zipcode: 91234
      DeviceTypes: Sensors
      DeviceTypes: Actuators

Query SensorVendorInfo DataModel

Find on DataModel with Cherry picked Attributes

#
Query:
  Find:
    SensorVendorInfo:
      SensorVendorSysId(ne: "")

SensorVendorInfo Find Result Contains data created in VendorInfo DataModel.

Find Result of DataModel with Cherry picked Attributes

#
Find(Status="Success"):
  Result:
    SensorVendorInfo:
      SensorVendorSysId: chag3vw7tcet7dvg2athubjwl2gvth73
      SensorVendorName: Phidget

Note that Data can be created in opposite direction as well i.e. Once created in SensorVendorInfo the common attributes will be available in VendorInfo as well.

Create SensorVendor Info

#
Create:
  SensorVendorInfo:
        SensorVendorName: Phidget2
# Lets Find from VendorInfo
Find:
  VendorInfo:
     VendorName(ne: "")
     
#Here is Find Result
Find(Status: "Success"):
  Result:
    VendorInfo:
      VendorSysId: KP3XJHCLAAAAUAABBN4HSJE7
      VendorName: Phidget2
  Result:
    VendorInfo:
      VendorSysId: chag3vw7tcet7dvg2athubjwl2gvth73
      DeviceTypes: Sensors
      DeviceTypes: Actuators
      VendorAddress:
        City: Sunnyvale:
        Street: "123 TQL Way"
        Zipcode: 91234      
      VendorTitle: "Sensor Provider"
      VendorName: Phidget

DataModel by picking Attributes from other defined DataModel + newly defined Attributes

DataModel can contain both cherry picked attributes as well as new attributes. Here SensorVendorInfo contains SensorTypes as new attribute of type string.

Cherry picked DataModel

#
DataModel(Name: "VendorInfo"): 
  Sid(Name: "VendorSysId"") 
  String(Name: "VendorName"") 
  String(Name: "VendorTitle"") 
  PostalAddress(Name: "VendorAddress"") 
  String(Name: "DeviceTypes", Cardinality: "0..m"") 
  Unique(Name: "UniqueVendorName", Value: "VendorName"") 

DataModel(Name: "SensorVendorInfo"): 
   Attribute(Name: "SensorVendorSysId", value: "VendorInfo.VendorSysId"") 
   Attribute(Name: "SensorVendorName", value: "VendorInfo.VendorName"") 
   String(Name: "SensorTypes, Cardinality: "0..m"")

Let's create SensorVendorInfo now using Create TQL Query:

Create DataModel from Cherry picked Attributes

#
Query:
  Create:
  	SensorVendorInfo:
      SensorVendorName: Phidget
      SensorVendorTitle: "Sensor Provider"
      SensorTypes: Temperature
      SensorTypes: Light

Let's do a Find on VendorInfo. We get the VendorInfo and VendorTitle data back.

Find VendorInfo

#
Query:
  Find:
    VendorInfo:
      vendorSysId(ne: "")

Find VendorInfo Result

Find VendorInfo Result

#
Find(Status: "Success"):
  Result:
    VendorInfo:
      VendorSysId: KNTR2FJXAAAAUAABA5OUP375
      VendorName: Phidget

Selective Cherry picking using Constraint

In some cases we may want to selective pick attributes. For example, We only want Vendors with Sensor DeviceType. This can be achieved using Constraint.

In this case only Sensor DeviceTypes will be populated in SensorVendorInfo

Find VendorInfo Result

#
DataModel(name: "SensorVendorInfo"):
  Attribute(name: "SensorVendorSysId", value: "VendorInfo.VendorSysId")
  Attribute(name: "SensorVendorName", value: "VendorInfo.VendorName")
  String(name: "SensorTypes", Cardinality: "0..m")
  Constraint(target: "VendorInfo.DeviceTypes", eq: "lit.Sensor")