Fix index class argument name not work (#1856)

* Fix index class argument `name` not work

* refactor: add `field_names` property to Index class

* Check custom index name in generated schema

* Add `index_name` and `get_sql` back to Index class for aerich

tests/fields/test_db_index.py

@@ -99,7 +99,10 @@ class TestIndexAliasChar(TestIndexAlias):
 
 class TestModelWithIndexes(test.TestCase):
     def test_meta(self):
-        self.assertEqual(ModelWithIndexes._meta.indexes, [Index(fields=("f1", "f2"))])
+        self.assertEqual(
+            ModelWithIndexes._meta.indexes,
+            [Index(fields=("f1", "f2")), Index(fields=("f3",), name="model_with_indexes__f3")],
+        )
         self.assertTrue(ModelWithIndexes._meta.fields_map["id"].index)
         self.assertTrue(ModelWithIndexes._meta.fields_map["indexed"].index)
         self.assertTrue(ModelWithIndexes._meta.fields_map["unique_indexed"].unique)

tests/schema/test_generate_schema.py

@@ -174,6 +174,11 @@ async def test_create_index(self):
         sql = self.get_sql("CREATE INDEX")
         self.assertIsNotNone(re.search(r"idx_tournament_created_\w+", sql))
 
+    async def test_create_index_with_custom_name(self):
+        await self.init_for("tests.testmodels")
+        sql = self.get_sql("f3")
+        self.assertIn("model_with_indexes__f3", sql)
+
     async def test_fk_bad_model_name(self):
         with self.assertRaisesRegex(
             ConfigurationError, 'ForeignKeyField accepts model name in format "app.Model"'

tests/testmodels.py

@@ -1059,11 +1059,13 @@ class ModelWithIndexes(Model):
     unique_indexed = fields.CharField(max_length=16, unique=True)
     f1 = fields.CharField(max_length=16)
     f2 = fields.CharField(max_length=16)
+    f3 = fields.CharField(max_length=16)
     u1 = fields.IntField()
     u2 = fields.IntField()
 
     class Meta:
         indexes = [
             Index(fields=["f1", "f2"]),
+            Index(fields=["f3"], name="model_with_indexes__f3"),
         ]
         unique_together = [("u1", "u2")]

tests/utils/test_describe_model.py

@@ -1568,7 +1568,16 @@ def test_describe_indexes_serializable(self):
 
         self.assertEqual(
             val["indexes"],
-            [{"fields": ["f1", "f2"], "expressions": [], "name": None, "type": "", "extra": ""}],
+            [
+                {"fields": ["f1", "f2"], "expressions": [], "name": None, "type": "", "extra": ""},
+                {
+                    "fields": ["f3"],
+                    "expressions": [],
+                    "name": "model_with_indexes__f3",
+                    "type": "",
+                    "extra": "",
+                },
+            ],
         )
 
     def test_describe_indexes_not_serializable(self):

tortoise/backends/base/schema_generator.py

@@ -4,8 +4,6 @@
 from hashlib import sha256
 from typing import TYPE_CHECKING, Any, Type, cast
 
-from pypika_tortoise.context import DEFAULT_SQL_CONTEXT
-
 from tortoise.exceptions import ConfigurationError
 from tortoise.fields import JSONField, TextField, UUIDField
 from tortoise.fields.relational import OneToOneFieldInstance
@@ -348,31 +346,17 @@ def _get_table_sql(self, model: "Type[Model]", safe: bool = True) -> dict:
 
         if model._meta.indexes:
             for index in model._meta.indexes:
-                if not isinstance(index, Index):
+                if isinstance(index, Index):
+                    idx_sql = index.get_sql(self, model, safe)
+                else:
                     fields = []
                     for field in index:
                         field_object = model._meta.fields_map[field]
                         fields.append(field_object.source_field or field)
+                    idx_sql = self._get_index_sql(model, fields, safe=safe)
 
-                    _indexes.append(self._get_index_sql(model, fields, safe=safe))
-                else:
-                    if index.fields:
-                        fields = [f for f in index.fields]
-                    elif index.expressions:
-                        fields = [
-                            f"({expression.get_sql(DEFAULT_SQL_CONTEXT)})"
-                            for expression in index.expressions
-                        ]
-                    else:
-                        raise ConfigurationError(
-                            "At least one field or expression is required to define an index."
-                        )
-
-                    _indexes.append(
-                        self._get_index_sql(
-                            model, fields, safe=safe, index_type=index.INDEX_TYPE, extra=index.extra
-                        )
-                    )
+                if idx_sql:
+                    _indexes.append(idx_sql)
 
         field_indexes_sqls = [val for val in list(dict.fromkeys(_indexes)) if val]
 

tortoise/indexes.py

@@ -1,11 +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 = ""
@@ -46,6 +51,36 @@ 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:
+            return list(self.fields)
+        elif self.expressions:
+            return [
+                f"({expression.get_sql(DEFAULT_SQL_CONTEXT)})" for expression in self.expressions
+            ]
+        else:
+            raise ConfigurationError(
+                "At least one field or expression is required to define an index."
+            )
+
     def __repr__(self) -> str:
         argument = ""
         if self.expressions: