Windchill REST Services > Windchill REST Services Domain Capabilities > Customizing Domains > Recommendations When Adding Imports to the PTC-Provided Domains > Use Case: Adding a Navigation Between Domains Where Imports do not Exist Out of the Box > Approach 2: Create a Lightweight Entity Type Representation from Another Domain and Add a Navigation to that Lightweight Entity Type
  
Approach 2: Create a Lightweight Entity Type Representation from Another Domain and Add a Navigation to that Lightweight Entity Type
1. Extend ProdMgmt to add a lightweight Change Notice representation. This lightweight entity representation may have canonical links to the full entity representation in the ChangeMgmt domain.
2. Extend Part to add the navigation to the lightweight Change Notice.
Create PartsExt.json
{
"extends":"Part",
"navigations":[
{
"name":"RelatedChangeNotices",
"target":"LightweightCNs",
"type":"PTC.ProdMgmt.LightweightCN",
"isCollection":true
}
]
}
Add LightweightCN.json
{
"name": "LightweightCN",
"collectionName": "LightweightCNs",
"includeInServiceDocument": false,
"type": "wcType",
"wcType": "wt.change2.WTChangeOrder2",
"description": "Lightweight Change Notice",
"operations": "READ",
"parent": {
"name": "WindchillEntities"
},
"generateDomainSpecificLinks": [
{
"domain": "ChangeMgmt",
"entitySet": "ChangeNotices"
}
],
"attributes":[
{
"name": "Name",
"internalName": "name",
"type": "String",
"required": true,
"dataUtilityId": "odata.ChangeItemPropertyName"
}, {
"name": "Number",
"internalName": "number",
"type": "String",
"dataUtilityId": "odata.ChangeItemPropertyNumber"
}, {
"name": "Identity",
"internalName": "displayIdentity",
"type": "String",
"readOnly": true,
"rbInfoForDisplayName": "com.ptc.cat.catTableRB|IDENTITY"
},{
"name":"State",
"internalName":"state.state",
"type":"PTC.EnumType",
"readOnly":true,
"dataUtilityId": "odata.ChangeItemPropertyState"
}
]
}
Request
GET /Windchill/servlet/odata/ProdMgmt/Parts(‘<oid>')?$select=Identity&$expand=RelatedChangeNotices
Accept: application/json;odata.metadata=full
Response
{
"@odata.context": “<Windchill_URL>/v6/ProdMgmt/$metadata#Parts(ID,Identity)/$entity",
"@odata.type": "#PTC.ProdMgmt.Part",
"@odata.id": “<Windchill_URL>/v6/ProdMgmt/Parts('OR:wt.part.WTPart:749554')",
"ID": "OR:wt.part.WTPart:749554",
"Identity": "Part - 0000000921, Test part for change, Demo Organization, A.1 (Design)",
"@PTC.AppliedContainerContext.LocalTimeZone": "America/St_Johns",
"RelatedChangeNotices": [
{
"@odata.type": "#PTC.ProdMgmt.LightweightCN",
"@odata.id": “<Windchill_URL>/v6/ProdMgmt/Parts('OR:wt.part.WTPart:749554')/RelatedChangeNotices('OR%3Awt.change2.WTChangeOrder2%3A749586')",
"CreatedOn@odata.type": "#DateTimeOffset",
"CreatedOn": "2023-05-12T10:34:31-02:30",
"ID": "OR:wt.change2.WTChangeOrder2:749586",
"LastModified@odata.type": "#DateTimeOffset",
"LastModified": "2023-05-12T10:34:31-02:30",
"CreatedBy": "Site, Administrator",
"Identity": "Change Notice - 00041",
"ModifiedBy": "Site, Administrator",
"Name": "CN",
"Number": "00041",
"State": {
"@odata.type": "#PTC.EnumType",
"Value": "OPEN",
"Display": "Open"
},
"@Core.Links": [
{
"rel@odata.type": "#String",
"rel": "ChangeMgmt/ChangeNotices",
"href@odata.type": "#String",
"href": “<Windchill_URL>/v7/ChangeMgmt/ChangeNotices('OR:wt.change2.WTChangeOrder2:749586')"
}
]
}
],
"RelatedChangeNotices@odata.navigationLink": “Windchill_URL/v6/ProdMgmt/Parts('OR:wt.part.WTPart:749554')/LightweightCNs"
}
 
Follow the Core.Links, to navigate to the ChangeNotice.