replace usages of copy_arrays with memmap

CHANGES.rst

@@ -1,7 +1,7 @@
 2.0.1 (unreleased)
 ===================
 
-- 
+- replace usages of ``copy_arrays`` with ``memmap`` [#306]
 
 2.0.0 (2024-06-24)
 ===================

src/stdatamodels/jwst/datamodels/util.py

@@ -128,7 +128,7 @@ def open(init=None, guess=True, memmap=False, **kwargs):
             return ModelContainer(init, **kwargs)
 
         elif file_type == "asdf":
-            asdffile = asdf.open(init, copy_arrays=not memmap)
+            asdffile = asdf.open(init, memmap=memmap)
 
             # Detect model type, then get defined model, and call it.
             new_class = _class_from_model_type(asdffile)

src/stdatamodels/model_base.py

@@ -234,9 +234,7 @@ def __init__(self, init=None, schema=None, memmap=False,
                 )
 
             elif file_type == "asdf":
-                # use memmap argument of "copy_arrays" was not defined
-                kwargs["copy_arrays"] = kwargs.get("copy_arrays", not memmap)
-                asdffile = self.open_asdf(init=init, **kwargs)
+                asdffile = self.open_asdf(init=init, memmap=memmap, **kwargs)
 
             else:
                 # TODO handle json files as well