ignore init=False fields in dataclass_array_container

Author: alexfikl

arraycontext/container/dataclass.py

@@ -52,9 +52,11 @@ def dataclass_array_container(cls: type) -> type:
             "dataclass cannot have string-based type annotations"
 
     array_fields = [
-            f for f in fields(cls) if is_array_container_type(f.type)]
+            f for f in fields(cls)
+            if f.init and is_array_container_type(f.type)]
     non_array_fields = [
-            f for f in fields(cls) if not is_array_container_type(f.type)]
+            f for f in fields(cls)
+            if f.init and not is_array_container_type(f.type)]
 
     if not array_fields:
         raise ValueError(f"'{cls}' must have fields with array container type "