Feat: Adds support for macros in model_defaults and conditional properties (#3933)

Author: themisvaltinos

docs/concepts/macros/macro_variables.md

@@ -134,3 +134,4 @@ SQLMesh provides two other predefined variables used to modify model behavior ba
     * Can be used in model definitions when SQLGlot cannot fully parse a statement and you need to reference the model's underlying physical table directly.
     * Can be passed as an argument to macros that access or interact with the underlying physical table.
 * @this_env - A string value containing the name of the current [environment](../environments.md). Only available in [`before_all` and `after_all` statements](../../guides/configuration.md#before_all-and-after_all-statements), as well as in macros invoked within them.
+* @model_kind_name - A string value containing the name of the current model kind. Intended to be used in scenarios where you need to control the [physical properties in model defaults](../../reference/model_configuration.md#model-defaults).

docs/reference/model_configuration.md

@@ -107,6 +107,34 @@ To override `partition_expiration_days`, add a new `creatable_type` property and
     )
     ```
 
+You can also use the `@model_kind_name` variable to fine-tune control over `physical_properties` in `model_defaults`. This holds the current model's kind name and is useful for conditionally assigning a property. For example, to disable `creatable_type` for your project's `VIEW` kind models:
+
+=== "YAML"
+
+    ```yaml linenums="1"
+    model_defaults:
+      dialect: snowflake
+      start: 2022-01-01
+      physical_properties:
+        creatable_type: "@IF(@model_kind_name != 'VIEW', 'TRANSIENT', NULL)"
+    ```
+
+=== "Python"
+
+    ```python linenums="1"
+    from sqlmesh.core.config import Config, ModelDefaultsConfig
+
+    config = Config(
+      model_defaults=ModelDefaultsConfig(
+        dialect="snowflake",
+        start="2022-01-01",
+        physical_properties={
+          "creatable_type": "@IF(@model_kind_name != 'VIEW', 'TRANSIENT', NULL)",
+        },
+      ),
+    )
+    ```
+
 
 The SQLMesh project-level `model_defaults` key supports the following options, described in the [general model properties](#general-model-properties) table above:
 

sqlmesh/core/config/model.py

@@ -10,9 +10,9 @@
     model_kind_validator,
     on_destructive_change_validator,
 )
+from sqlmesh.core.model.meta import FunctionCall
 from sqlmesh.core.node import IntervalUnit
 from sqlmesh.utils.date import TimeLike
-from sqlmesh.core.model.meta import FunctionCall
 from sqlmesh.utils.pydantic import field_validator
 
 
@@ -56,10 +56,10 @@ class ModelDefaultsConfig(BaseConfig):
     virtual_properties: t.Optional[t.Dict[str, t.Any]] = None
     session_properties: t.Optional[t.Dict[str, t.Any]] = None
     audits: t.Optional[t.List[FunctionCall]] = None
-    optimize_query: t.Optional[bool] = None
-    allow_partials: t.Optional[bool] = None
-    interval_unit: t.Optional[IntervalUnit] = None
-    enabled: t.Optional[bool] = None
+    optimize_query: t.Optional[t.Union[str, bool]] = None
+    allow_partials: t.Optional[t.Union[str, bool]] = None
+    interval_unit: t.Optional[t.Union[str, IntervalUnit]] = None
+    enabled: t.Optional[t.Union[str, bool]] = None
 
     _model_kind_validator = model_kind_validator
     _on_destructive_change_validator = on_destructive_change_validator

sqlmesh/core/model/decorator.py

@@ -18,7 +18,9 @@
     create_sql_model,
     create_models_from_blueprints,
     get_model_name,
+    parse_defaults_properties,
     render_meta_fields,
+    render_model_defaults,
 )
 from sqlmesh.core.model.kind import ModelKindName, _ModelKind
 from sqlmesh.utils import registry_decorator, DECORATOR_RETURN_TYPE
@@ -159,8 +161,25 @@ def model(
         if isinstance(rendered_name, exp.Expression):
             rendered_fields["name"] = rendered_name.sql(dialect=dialect)
 
+        rendered_defaults = (
+            render_model_defaults(
+                defaults=defaults,
+                module_path=module_path,
+                macros=macros,
+                jinja_macros=jinja_macros,
+                variables=variables,
+                path=path,
+                dialect=dialect,
+                default_catalog=default_catalog,
+            )
+            if defaults
+            else {}
+        )
+
+        rendered_defaults = parse_defaults_properties(rendered_defaults, dialect=dialect)
+
         common_kwargs = {
-            "defaults": defaults,
+            "defaults": rendered_defaults,
             "path": path,
             "time_column_format": time_column_format,
             "python_env": serialize_env(env, path=module_path),