Fix code generation template params and filename (#784)

backend/plugin/code_generator/templates/python/crud.jinja

@@ -66,4 +66,4 @@ class CRUD{{ class_name }}(CRUDPlus[{{ schema_name }}]):
         return await self.delete_model_by_column(db, allow_multiple=True, id__in=pks)
 
 
-{{ instance_name }}_dao: CRUD{{ class_name }} = CRUD{{ class_name }}({{ class_name }})
+{{ table_name }}_dao: CRUD{{ class_name }} = CRUD{{ class_name }}({{ class_name }})

backend/plugin/code_generator/templates/python/model.jinja

@@ -1,6 +1,9 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+{% if default_datetime_column %}
 from datetime import datetime
+
+{% endif %}
 from uuid import UUID
 
 import sqlalchemy as sa
@@ -12,10 +15,10 @@ from sqlalchemy.dialects import postgresql
 {% endif -%}
 from sqlalchemy.orm import Mapped, mapped_column
 
-from backend.common.model import {% if default_datetime_column %}Base{% else %}MappedBase{% endif %}, id_key
+from backend.common.model import {% if default_datetime_column %}Base{% else %}DataClassBase{% endif %}, id_key
 
 
-class {{ class_name }}({% if default_datetime_column %}Base{% else %}MappedBase{% endif %}):
+class {{ class_name }}({% if default_datetime_column %}Base{% else %}DataClassBase{% endif %}):
     """{{ table_comment }}"""
 
     __tablename__ = '{{ table_name }}'

backend/plugin/code_generator/templates/python/schema.jinja

@@ -1,7 +1,9 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+{% if default_datetime_column %}
 from datetime import datetime
 
+{% endif %}
 from pydantic import ConfigDict, Field
 
 from backend.common.schema import SchemaBase

backend/plugin/code_generator/templates/python/service.jinja

@@ -75,4 +75,4 @@ class {{ class_name }}Service:
             return count
 
 
-{{ instance_name }}_service: {{ class_name }}Service = {{ class_name }}Service()
+{{ table_name }}_service: {{ class_name }}Service = {{ class_name }}Service()