Add delete_many to support for bulk deletes

aredis_om/model/model.py

@@ -24,6 +24,7 @@
     no_type_check,
 )
 
+from more_itertools import ichunked
 from pydantic import BaseModel, validator
 from pydantic.fields import FieldInfo as PydanticFieldInfo
 from pydantic.fields import ModelField, Undefined, UndefinedType
@@ -1117,9 +1118,17 @@ def key(self):
         return self.make_primary_key(pk)
 
     @classmethod
-    async def delete(cls, pk: Any) -> int:
+    async def _delete(cls, db, *pks):
+        return await db.delete(*pks)
+
+    @classmethod
+    async def delete(
+        cls, pk: Any, pipeline: Optional[redis.client.Pipeline] = None
+    ) -> int:
         """Delete data at this key."""
-        return await cls.db().delete(cls.make_primary_key(pk))
+        db = cls._get_db(pipeline)
+
+        return await cls._delete(db, cls.make_primary_key(pk))
 
     @classmethod
     async def get(cls, pk: Any) -> "RedisModel":
@@ -1137,10 +1146,7 @@ async def save(
     async def expire(
         self, num_seconds: int, pipeline: Optional[redis.client.Pipeline] = None
     ):
-        if pipeline is None:
-            db = self.db()
-        else:
-            db = pipeline
+        db = self._get_db(pipeline)
 
         # TODO: Wrap any Redis response errors in a custom exception?
         await db.expire(self.make_primary_key(self.pk), num_seconds)
@@ -1232,16 +1238,7 @@ async def add(
         pipeline: Optional[redis.client.Pipeline] = None,
         pipeline_verifier: Callable[..., Any] = verify_pipeline_response,
     ) -> Sequence["RedisModel"]:
-        if pipeline is None:
-            # By default, send commands in a pipeline. Saving each model will
-            # be atomic, but Redis may process other commands in between
-            # these saves.
-            db = cls.db().pipeline(transaction=False)
-        else:
-            # If the user gave us a pipeline, add our commands to that. The user
-            # will be responsible for executing the pipeline after they've accumulated
-            # the commands they want to send.
-            db = pipeline
+        db = cls._get_db(pipeline, bulk=True)
 
         for model in models:
             # save() just returns the model, we don't need that here.
@@ -1255,6 +1252,31 @@ async def add(
 
         return models
 
+    @classmethod
+    def _get_db(
+        self, pipeline: Optional[redis.client.Pipeline] = None, bulk: bool = False
+    ):
+        if pipeline is not None:
+            return pipeline
+        elif bulk:
+            return self.db().pipeline(transaction=False)
+        else:
+            return self.db()
+
+    @classmethod
+    async def delete_many(
+        cls,
+        models: Sequence["RedisModel"],
+        pipeline: Optional[redis.client.Pipeline] = None,
+    ) -> int:
+        db = cls._get_db(pipeline)
+
+        for chunk in ichunked(models, 100):
+            pks = [cls.make_primary_key(model.pk) for model in chunk]
+            await cls._delete(db, *pks)
+
+        return len(models)
+
     @classmethod
     def redisearch_schema(cls):
         raise NotImplementedError
@@ -1293,10 +1315,8 @@ async def save(
         self, pipeline: Optional[redis.client.Pipeline] = None
     ) -> "HashModel":
         self.check()
-        if pipeline is None:
-            db = self.db()
-        else:
-            db = pipeline
+        db = self._get_db(pipeline)
+
         document = jsonable_encoder(self.dict())
         # TODO: Wrap any Redis response errors in a custom exception?
         await db.hset(self.key(), mapping=document)
@@ -1467,10 +1487,8 @@ async def save(
         self, pipeline: Optional[redis.client.Pipeline] = None
     ) -> "JsonModel":
         self.check()
-        if pipeline is None:
-            db = self.db()
-        else:
-            db = pipeline
+        db = self._get_db(pipeline)
+
         # TODO: Wrap response errors in a custom exception?
         await db.execute_command("JSON.SET", self.key(), ".", self.json())
         return self