Fix incorrect self-referencing foreign keys

dbtmetabase/manifest.py

@@ -158,13 +158,12 @@ def _read_relationships(
         relationships = {}
 
         for child_id in manifest["child_map"][unique_id]:
-            child = {}
-            if manifest[group]:
-                child = manifest[group].get(child_id, {})
+            child = manifest.get(group, {}).get(child_id, {})
 
             if (
                 child.get("resource_type") == "test"
                 and child.get("test_metadata", {}).get("name") == "relationships"
+                and child.get("attached_node") == unique_id
             ):
                 # To get the name of the foreign table, we could use child[test_metadata][kwargs][to], which
                 # would return the ref() written in the test, but if the model has an alias, that's not enough.
@@ -204,22 +203,23 @@ def _read_relationships(
 
                 depends_on_id = depends_on_nodes[0]
 
-                fk_model = manifest[group].get(depends_on_id, {})
-                fk_target_table_alias = fk_model.get(
-                    "alias", fk_model.get("identifier", fk_model.get("name"))
+                fk_target_model = manifest[group].get(depends_on_id, {})
+                fk_target_table = fk_target_model.get(
+                    "alias",
+                    fk_target_model.get("identifier", fk_target_model.get("name")),
                 )
-
-                if not fk_target_table_alias:
+                if not fk_target_table:
                     _logger.debug("Cannot resolve dependency for '%s'", depends_on_id)
                     continue
 
                 fk_target_schema = manifest[group][depends_on_id].get(
                     "schema", DEFAULT_SCHEMA
                 )
+                fk_target_table = f"{fk_target_schema}.{fk_target_table}"
                 fk_target_field = child["test_metadata"]["kwargs"]["field"].strip('"')
 
                 relationships[child["column_name"]] = {
-                    "fk_target_table": f"{fk_target_schema}.{fk_target_table_alias}",
+                    "fk_target_table": fk_target_table,
                     "fk_target_field": fk_target_field,
                 }