Database plugin type support reset_system, to reset modules

gramps/gen/dbstate.py

@@ -140,18 +140,16 @@ class DbState(Callback):
             pmgr.reg_plugins(USER_PLUGINS, self, None, load_on_reg=True)
             pdata = pmgr.get_plugin(id)
 
-        ### FIXME: Currently Django needs to reset modules
-        if pdata.id == "djangodb":
-            if self.modules_is_set():
-                self.reset_modules()
-            else:
-                self.save_modules()
+        if pdata:
+            if pdata.reset_system:
+                if self.modules_is_set():
+                    self.reset_modules()
+                else:
+                    self.save_modules()
+            mod = pmgr.load_plugin(pdata)
+            database = getattr(mod, pdata.databaseclass)
+            return database()
 
-        mod = pmgr.load_plugin(pdata)
-        database = getattr(mod, pdata.databaseclass)
-        return database()
-
-    ## FIXME:
     ## Work-around for databases that need sys refresh (django):
     def modules_is_set(self):
         if hasattr(self, "_modules"):

gramps/gen/plug/_pluginreg.py

@@ -356,6 +356,9 @@ class PluginData(object):
 
     .. attribute:: databaseclass
        The class in the module that is the database class
+    .. attribute:: reset_system
+       Boolean to indicate that the system (sys.modules) should
+       be reset.
     """
 
     def __init__(self):
@@ -430,6 +433,7 @@ class PluginData(object):
         self._order = END
         #DATABASE attr
         self._databaseclass = None
+        self._reset_system = False
         #GENERAL attr
         self._data = []
         self._process = None
@@ -949,7 +953,16 @@ class PluginData(object):
     def _get_databaseclass(self):
         return self._databaseclass
 
+    def _set_reset_system(self, reset_system):
+        if not self._ptype == DATABASE:
+            raise ValueError('reset_system may only be set for DATABASE plugins')
+        self._reset_system = reset_system
+
+    def _get_reset_system(self):
+        return self._reset_system
+
     databaseclass = property(_get_databaseclass, _set_databaseclass)
+    reset_system = property(_get_reset_system, _set_reset_system)
 
     #GENERAL attr
     def _set_data(self, data):

gramps/plugins/database/djangodb.gpr.py

@@ -29,3 +29,4 @@ plg.status = STABLE
 plg.fname = 'djangodb.py'
 plg.ptype = DATABASE
 plg.databaseclass = 'DbDjango'
+plg.reset_system = True