RCAL-438 Add support for Reference File Quantities (#140)

* Modified dark class to support quantities in Roman.

* Updated Changelog.

* Flake8 compliance.

CHANGES.rst

@@ -4,7 +4,7 @@
 General
 -------
 
--
+- 
 
 Bug Fixes
 ---------
@@ -16,6 +16,12 @@ Changes to API
 
 -
 
+dark
+----
+
+- Modified dark class to support quantities in Roman.[#140]
+
+=======
 1.3.2 (2023-01-10)
 ==================
 
@@ -29,6 +35,7 @@ ramp_fitting
   negation of a DQ flag then cast to a np.uint32 caused an over flow.  The
   flag is now cast to a np.uint32 before negation. [#139]
 
+
 1.3.1 (2023-01-03)
 ==================
 

src/stcal/dark_current/dark_class.py

@@ -36,9 +36,13 @@ def __init__(self, dims=None, dark_model=None):
             meta data set based on the arrays in the dark_model.
         """
         if dark_model is not None:
-            self.data = dark_model.data
+            if isinstance(dark_model.data, u.Quantity):
+                self.data = dark_model.data.value
+                self.err = dark_model.err.value
+            else:
+                self.data = dark_model.data
+                self.err = dark_model.err
             self.groupdq = dark_model.dq
-            self.err = dark_model.err
 
             self.exp_nframes = dark_model.meta.exposure.nframes
             self.exp_ngroups = dark_model.meta.exposure.ngroups