Fix bug when reading mosaic data in files from previous pypeit versions.

doc/releases/1.16.1dev.rst

@@ -150,6 +150,8 @@ Bug Fixes
   the 'BOXSLIT' flag.
 - Fix a bug in `pypeit_coadd_2d` related to how the binning was taken into account
   in the mask definition, and in the calculation of the offset between frames.
+- Fix bug when trying to open mosaic data from previous versions; version
+  checking flag was not being propagated. 
 
 
 

pypeit/images/mosaic.py

@@ -53,7 +53,8 @@ class Mosaic(datamodel.DataContainer):
                  'tform': dict(otype=np.ndarray, atype=float,
                                descr='The full transformation matrix for each detector used to '
                                      'construct the mosaic.'),
-                 'msc_ord': dict(otype=int, descr='Order of the interpolation used to construct the mosaic.')}
+                 'msc_ord': dict(otype=int,
+                                 descr='Order of the interpolation used to construct the mosaic.')}
 
     name_prefix = 'MSC'
     """
@@ -159,10 +160,18 @@ def _parse(cls, hdu, hdu_prefix=None, **kwargs):
         hdr = fits.Header()
         hdr['DMODCLS'] = DetectorContainer.__name__
         hdr['DMODVER'] = _hdu.header['DETMODV']
-        d['detectors'] = np.array([DetectorContainer.from_hdu(
-                                        fits.BinTableHDU(data=table.Table(tbl[i]),
-                                                         name='DETECTOR', header=hdr))
-                                    for i in range(ndet)])
+        d['detectors'] = []
+        for i in range(ndet):
+            _hdu = fits.BinTableHDU(data=table.Table(tbl[i]), name='DETECTOR', header=hdr)
+            # NOTE: I'm using _parse() to ensure that I keep the result of the
+            # version and type checking.
+            _d, vp, tp, ph = DetectorContainer._parse(_hdu)
+            if not vp:
+                msgs.warn('Detector datamodel version is incorrect.  May cause a fault.')
+            version_passed &= vp
+            d['detectors'] += [DetectorContainer.from_dict(d=_d) if tp else None]
+            type_passed &= tp
+        d['detectors'] = np.array(d['detectors'], dtype=object)
 
         return d, version_passed, type_passed, parsed_hdus
 
@@ -213,5 +222,7 @@ def copy(self):
         """
         Return a (deep) copy of the object.
         """
-        return Mosaic(id=self.id, detectors=np.array([det.copy() for det in self.detectors]), shape=self.shape, shift=self.shift.copy(), rot=self.rot.copy(), tform=self.tform.copy(), msc_ord=self.msc_ord)
+        return Mosaic(id=self.id, detectors=np.array([det.copy() for det in self.detectors]),
+                      shape=self.shape, shift=self.shift.copy(), rot=self.rot.copy(),
+                      tform=self.tform.copy(), msc_ord=self.msc_ord)
 

pypeit/specobjs.py

@@ -113,7 +113,7 @@ def from_fitsfile(cls, fits_file, det=None, chk_version=True):
                 # from_hdu method, and the name of the HDU must have a known format
                 # (e.g., 'DET01-DETECTOR').
                 _det = hdu.name.split('-')[0]
-                detector_hdus[_det] = dmodcls.from_hdu(hdu)
+                detector_hdus[_det] = dmodcls.from_hdu(hdu, chk_version=chk_version)
 
             # Now the objects
             for hdu in hdul[1:]:

pypeit/tests/test_mosaic.py

@@ -0,0 +1,41 @@
+from pathlib import Path
+from IPython import embed
+
+import pytest
+
+from astropy.io import fits
+
+from pypeit.pypmsgs import PypeItDataModelError
+from pypeit.tests.tstutils import data_output_path
+from pypeit.images.mosaic import Mosaic
+from pypeit.spectrographs.util import load_spectrograph
+
+
+def test_io():
+    # Create the mosaic
+    spec = load_spectrograph('keck_deimos')
+    mpar = spec.get_mosaic_par((1,5))
+
+    # Write it
+    ofile = data_output_path('tmp_mosaic.fits')
+    mpar.to_file(ofile, overwrite=True)
+
+    # Try to read it
+    _mpar = Mosaic.from_file(ofile)
+
+    # Change the version
+    _ofile = data_output_path('tmp_mosaic_wrongver.fits')
+    with fits.open(ofile) as hdu:
+        hdu['MOSAIC'].header['DMODVER'] = '1.0.0'
+        hdu.writeto(_ofile, overwrite=True)
+
+    # Reading should fail because version is checked by default
+    with pytest.raises(PypeItDataModelError):
+        _mpar = Mosaic.from_file(_ofile)
+
+    # Should not fail because skipping the version check    
+    _mpar = Mosaic.from_file(_ofile, chk_version=False)
+
+    # Remove files
+    Path(ofile).unlink()
+    Path(_ofile).unlink()