specwcs using new modeling class - error Look at branch: https://github.com/wkerzendorf/specutils/blob/specwcs_update/specutils/wcs/specwcs.py

gistfile1.py

ERROR: AttributeError: 'Spectrum1DLookupWCS' object has no attribute '_param_dim' [astropy.modeling.core]
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-3-01a2fdaa6cd5> in <module>()
----> 1 specwcs.Spectrum1DLookupWCS(np.arange(3000, 6000) * u.Angstrom)

/Users/wkerzend/scripts/python/specutils/specutils/wcs/specwcs.py in __init__(self, lookup_table, unit, lookup_table_interpolation_kind)
     60             self.lookup_table_parameter = lookup_table * unit
     61         elif unit is None: # lookup_table is already unit'd
---> 62             self.lookup_table_parameter = lookup_table
     63 
     64         self.lookup_table_interpolation_kind = lookup_table_interpolation_kind

/Users/wkerzend/scripts/python/astropy/build/lib.macosx-10.9-intel-2.7/astropy/modeling/parameters.pyc in __set__(self, obj, value)
    153 
    154     def __set__(self, obj, value):
--> 155         value, shape = self._validate_value(obj, value)
    156         # Compare the shape against the previous value's shape, if it exists
    157         if hasattr(obj, self._attr):

/Users/wkerzend/scripts/python/astropy/build/lib.macosx-10.9-intel-2.7/astropy/modeling/parameters.pyc in _validate_value(self, model, value)
    410             return
    411 
--> 412         param_dim = model.param_dim
    413         if param_dim == 1:
    414             # Just validate the value with _tofloat

/Users/wkerzend/scripts/python/astropy/build/lib.macosx-10.9-intel-2.7/astropy/modeling/core.pyc in param_dim(self)
    185         """Number of parameter sets in a model."""
    186 
--> 187         return self._param_dim
    188 
    189     def __repr__(self):

AttributeError: 'Spectrum1DLookupWCS' object has no attribute '_param_dim'