Filters for remote columns will work through explicitly specified for…

…eign key.

examples/sqla/simple.py

@@ -62,7 +62,7 @@ class PostAdmin(sqlamodel.ModelView):
 
     searchable_columns = ('title', User.username)
 
-    column_filters = (User,
+    column_filters = ('user',
                       'title',
                       'date',
                       filters.FilterLike(Post.title, 'Fixed Title', options=(('test1', 'Test 1'), ('test2', 'Test 2'))))

flask_adminex/ext/sqlamodel/view.py

@@ -1,3 +1,4 @@
+
 from sqlalchemy.orm.attributes import InstrumentedAttribute
 from sqlalchemy.orm import subqueryload
 from sqlalchemy.sql.expression import desc
@@ -280,18 +281,18 @@ def scaffold_filters(self, name):
         if attr is None:
             raise Exception('Failed to find field for filter: %s' % name)
 
-        if hasattr(attr, '_sa_class_manager'):
+        if hasattr(attr, 'property') and hasattr(attr.property, 'direction'):
             filters = []
 
-            for p in self._get_model_iterator(attr):
+            for p in self._get_model_iterator(attr.property.mapper.class_):
                 if hasattr(p, 'columns'):
                     # TODO: Check for multiple columns
                     column = p.columns[0]
 
                     if column.foreign_keys or column.primary_key:
                         continue
 
-                    visible_name = '%s / %s' % (self.get_column_name(attr.__table__.name),
+                    visible_name = '%s / %s' % (self.get_column_name(attr.prop.table.name),
                                                 self.get_column_name(p.key))
 
                     type_name = type(column.type).__name__