Add index_name and get_sql back to Index class for aerich

Author: waketzheng

tortoise/backends/base/schema_generator.py

@@ -345,14 +345,7 @@ def _get_table_sql(self, model: "Type[Model]", safe: bool = True) -> dict:
         if model._meta.indexes:
             for index in model._meta.indexes:
                 if isinstance(index, Index):
-                    idx_sql = self._get_index_sql(
-                        model,
-                        index.field_names,
-                        safe=safe,
-                        index_name=index.name,
-                        index_type=index.INDEX_TYPE,
-                        extra=index.extra,
-                    )
+                    idx_sql = index.get_sql(self, model, safe)
                 else:
                     fields = []
                     for field in index:

tortoise/indexes.py

@@ -1,12 +1,16 @@
 from __future__ import annotations
 
-from typing import Any
+from typing import TYPE_CHECKING, Any, Type
 
 from pypika_tortoise.context import DEFAULT_SQL_CONTEXT
 from pypika_tortoise.terms import Term, ValueWrapper
 
 from tortoise.exceptions import ConfigurationError
 
+if TYPE_CHECKING:
+    from tortoise.backends.base.schema_generator import BaseSchemaGenerator
+    from tortoise.models import Model
+
 
 class Index:
     INDEX_TYPE = ""
@@ -47,6 +51,23 @@ def describe(self) -> dict:
             "extra": self.extra,
         }
 
+    def index_name(self, schema_generator: "BaseSchemaGenerator", model: "Type[Model]") -> str:
+        # This function is required by aerich
+        return self.name or schema_generator._generate_index_name("idx", model, self.field_names)
+
+    def get_sql(
+        self, schema_generator: "BaseSchemaGenerator", model: "Type[Model]", safe: bool
+    ) -> str:
+        # This function is required by aerich
+        return schema_generator._get_index_sql(
+            model,
+            self.field_names,
+            safe,
+            index_name=self.name,
+            index_type=self.INDEX_TYPE,
+            extra=self.extra,
+        )
+
     @property
     def field_names(self) -> list[str]:
         if self.fields: