DM-40512: fix bitrot in QuickLookIsrConnections

python/lsst/summit/utils/quickLook.py

@@ -19,6 +19,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+import dataclasses
 import os
 from lsst.ip.isr import IsrTask
 from lsst.ip.isr.isrTask import IsrTaskConnections
@@ -33,17 +34,6 @@
 __all__ = ['QuickLookIsrTask', 'QuickLookIsrTaskConfig']
 
 
-def _getArgs(connection):
-    """Get the all required args from a connection in order to reconstruct it.
-    """
-    newArgs = {}
-    for attr in ("name", "storageClass", "multiple", "doc", "dimensions", "isCalibration", "deferLoad",
-                 "minimum", "lookupFunction"):
-        if hasattr(connection, attr):
-            newArgs[attr] = getattr(connection, attr)
-    return newArgs
-
-
 class QuickLookIsrTaskConnections(IsrTaskConnections):
     """Copy isrTask's connections, changing prereq min values to zero.
 
@@ -57,12 +47,11 @@ def __init__(self, *, config=None):
         super().__init__(config=IsrTask.ConfigClass())  # need a dummy config, isn't used other than for ctor
         for name, connection in self.allConnections.items():
             if hasattr(connection, 'minimum'):
-                args = _getArgs(connection)
-                if name != "ccdExposure":  # need one input image always
-                    args['minimum'] = 0
-                newConnection = type(connection)(**args)
-                self.allConnections[name] = newConnection
-                setattr(self, name, newConnection)
+                setattr(
+                    self,
+                    name,
+                    dataclasses.replace(connection, minimum=(0 if name != "ccdExposure" else 1)),
+                )
 
         exposure = cT.Output(  # called just "exposure" to mimic isrTask's return struct
             name="quickLookExp",

tests/test_bestEffortIsr.py

@@ -24,6 +24,7 @@
 import lsst.utils.tests
 
 from lsst.summit.utils.bestEffort import BestEffortIsr
+from lsst.summit.utils.quickLook import QuickLookIsrTask
 import lsst.summit.utils.butlerUtils as butlerUtils
 import lsst.afw.image as afwImage
 
@@ -78,6 +79,15 @@ def test_raises(self):
         with self.assertRaises(ValueError):
             self.bestEffortIsr.getExposure(dataId)
 
+    def test_quicklook_connections(self):
+        """Test that various QuickLookIsrConnections inputs are no longer
+        required.
+        """
+        connections = QuickLookIsrTask.ConfigClass.ConnectionsClass(config=QuickLookIsrTask.ConfigClass())
+        self.assertEqual(connections.bias.minimum, 0)
+        self.assertEqual(connections.flat.minimum, 0)
+        self.assertEqual(connections.ccdExposure.minimum, 1)
+
 
 class TestMemory(lsst.utils.tests.MemoryTestCase):
     pass