Port the nubular emission module to the new interface to get metallicities.

pcigale/creation_modules/nebular.py

@@ -79,13 +79,15 @@ class NebularEmission(CreationModule):
                                    db.
                                    get_nebular_lines(m,
                                                      self.parameters['logU'])
-                                   for m in db.get_nebular_metallicities()
+                                   for m in db.get_nebular_lines_parameters()
+                                   ['metallicity']
                                    }
             self.cont_template = {m:
                                   db.
                                   get_nebular_continuum(m,
                                                         self.parameters['logU'])
-                                  for m in db.get_nebular_metallicities()
+                                  for m in db.get_nebular_continuum_parameters()
+                                  ['metallicity']
                                   }
 
         lines_width = self.parameters['nebular_lines_width'] * 1e3

pcigale/data/__init__.py

@@ -724,17 +724,6 @@ class Database(object):
         else:
             return None
 
-    def get_nebular_metallicities(self):
-        """Get the list of metallicities for the nebular emission.
-
-        Returns
-        -------
-        metallicities: list
-            list of the nebular emission metallicities
-        """
-        result = self.session.query(_NebularLines.metallicity).all()
-        return [_[0] for _ in result]
-
     def _get_parameters(self, schema):
         """Generic function to get parameters from an arbitrary schema.