Add "other" relation to reffable node classes (#7645)

.changes/unreleased/Under the Hood-20230515-152107.yaml

@@ -0,0 +1,6 @@
+kind: Under the Hood
+body: Add other relation to reffable nodes
+time: 2023-05-15T15:21:07.808892-05:00
+custom:
+  Author: stu-k
+  Issue: "7550"

core/dbt/contracts/graph/manifest.py

@@ -1323,6 +1323,8 @@ def __post_serialize__(self, dct):
         for unique_id, node in dct["nodes"].items():
             if "config_call_dict" in node:
                 del node["config_call_dict"]
+            if "state_relation" in node:
+                del node["state_relation"]
         return dct
 
 

core/dbt/contracts/graph/nodes.py

@@ -269,6 +269,17 @@ def add_public_node(self, value: str):
             self.public_nodes.append(value)
 
 
+@dataclass
+class StateRelation(dbtClassMixin):
+    alias: str
+    database: Optional[str]
+    schema: str
+
+    @property
+    def identifier(self):
+        return self.alias
+
+
 @dataclass
 class ParsedNodeMandatory(GraphNode, HasRelationMetadata, Replaceable):
     alias: str
@@ -557,6 +568,7 @@ class ModelNode(CompiledNode):
     constraints: List[ModelLevelConstraint] = field(default_factory=list)
     version: Optional[NodeVersion] = None
     latest_version: Optional[NodeVersion] = None
+    state_relation: Optional[StateRelation] = None
 
     @property
     def is_latest_version(self) -> bool:
@@ -739,6 +751,7 @@ class SeedNode(ParsedNode):  # No SQLDefaults!
     # and we need the root_path to load the seed later
     root_path: Optional[str] = None
     depends_on: MacroDependsOn = field(default_factory=MacroDependsOn)
+    state_relation: Optional[StateRelation] = None
 
     def same_seeds(self, other: "SeedNode") -> bool:
         # for seeds, we check the hashes. If the hashes are different types,
@@ -937,6 +950,7 @@ class IntermediateSnapshotNode(CompiledNode):
 class SnapshotNode(CompiledNode):
     resource_type: NodeType = field(metadata={"restrict": [NodeType.Snapshot]})
     config: SnapshotConfig
+    state_relation: Optional[StateRelation] = None
 
 
 # ====================================

test/unit/test_manifest.py

@@ -93,6 +93,7 @@
         "version",
         "latest_version",
         "constraints",
+        "state_relation",
     }
 )