Improve error message

Author: erindru

sqlmesh/core/context.py

@@ -214,6 +214,15 @@ def resolve_table(self, model_name: str) -> str:
         """
         model_name = normalize_model_name(model_name, self.default_catalog, self.default_dialect)
 
+        if model_name not in self._model_tables:
+            model_name_list = "\n".join(list(self._model_tables))
+            logger.debug(
+                f"'{model_name}' not found in model to table mapping. Available model names: \n{model_name_list}"
+            )
+            raise SQLMeshError(
+                f"Unable to find a table mapping for model '{model_name}'. Has it been spelled correctly?"
+            )
+
         # We generate SQL for the default dialect because the table name may be used in a
         # fetchdf call and so the quotes need to be correct (eg. backticks for bigquery)
         return parse_one(self._model_tables[model_name]).sql(

tests/core/test_test.py

@@ -3082,4 +3082,7 @@ def execute(
     assert '"GOLD"."SUSHI"."FOO"' in test.context._model_tables
     assert '"GOLD"."SUSHI"."BAR"' in test.context._model_tables
 
+    with pytest.raises(SQLMeshError, match=r"Unable to find a table mapping"):
+        test.context.resolve_table("silver.sushi.bar")
+
     _check_successful_or_raise(test.run())