asset check factory docs

docs/content/concepts/assets/asset-checks.mdx

@@ -158,6 +158,50 @@ defs = Definitions(
 
 There are a variety of types supported via the <PyObject object="MetadataValue" /> class. You can view the metadata on the **Checks** tab of the **Asset details** page.
 
+### Asset check factories
+
+If you want to define many checks that are similar, you can use the factory pattern. Here's an example factory that accepts a list of sql statements and turns them in to asset checks.
+
+```python file=/concepts/assets/asset_checks/factory.py
+from typing import Any, List, Mapping
+
+from dagster import AssetCheckResult, Definitions, asset_check
+
+
+def make_checks(check_blobs: List[Mapping[str, Any]]):
+    checks = []
+    for check_blob in check_blobs:
+
+        @asset_check(name=check_blob["name"], asset=check_blob["asset"])
+        def _check(context):
+            db_connection = ...
+            rows = db_connection.execute(check_blob["sql"])
+            return AssetCheckResult(
+                passed=len(rows) == 0, metadata={"num_rows": len(rows)}
+            )
+
+        checks.append(_check)
+
+    return checks
+
+
+check_blobs = [
+    {
+        "name": "orders_id_has_no_nulls",
+        "asset": "orders",
+        "sql": "select * from orders where order_id is null",
+    },
+    {
+        "name": "items_id_has_no_nulls",
+        "asset": "items",
+        "sql": "select * from items where item_id is null",
+    },
+    ...,
+]
+
+defs = Definitions(asset_checks=make_checks(check_blobs))
+```
+
 ---
 
 ## Executing checks

examples/docs_snippets/docs_snippets/concepts/assets/asset_checks/factory.py

@@ -0,0 +1,37 @@
+from typing import Any, List, Mapping
+
+from dagster import AssetCheckResult, Definitions, asset_check
+
+
+def make_checks(check_blobs: List[Mapping[str, Any]]):
+    checks = []
+    for check_blob in check_blobs:
+
+        @asset_check(name=check_blob["name"], asset=check_blob["asset"])
+        def _check(context):
+            db_connection = ...
+            rows = db_connection.execute(check_blob["sql"])
+            return AssetCheckResult(
+                passed=len(rows) == 0, metadata={"num_rows": len(rows)}
+            )
+
+        checks.append(_check)
+
+    return checks
+
+
+check_blobs = [
+    {
+        "name": "orders_id_has_no_nulls",
+        "asset": "orders",
+        "sql": "select * from orders where order_id is null",
+    },
+    {
+        "name": "items_id_has_no_nulls",
+        "asset": "items",
+        "sql": "select * from items where item_id is null",
+    },
+    ...,
+]
+
+defs = Definitions(asset_checks=make_checks(check_blobs))