Fixed #728 - Explicit filters also support joins

flask_admin/contrib/sqla/view.py

@@ -531,6 +531,7 @@ class ModelView(BaseModelView):
                                                         visible_name)
 
                     if flt:
+                        self._postprocess_filter(flt)
                         table = column.table
 
                         if join_tables:
@@ -586,6 +587,14 @@ class ModelView(BaseModelView):
         """
         return isinstance(filter, filters.BaseSQLAFilter)
 
+    def handle_filter(self, filter):
+        column = filter.column
+
+        if self._need_join(column.table):
+            self._filter_joins[column.table.name] = [column.table]
+
+        return filter
+
     def scaffold_form(self):
         """
             Create form from the model.

flask_admin/model/base.py

@@ -773,6 +773,15 @@ class BaseModelView(BaseView, ActionsMixin):
         """
         return isinstance(filter, filters.BaseFilter)
 
+    def handle_filter(self, filter):
+        """
+            Postprocess (add joins, etc) for a filter.
+
+            :param filter:
+                Filter object to postprocess
+        """
+        return filter
+
     def get_filters(self):
         """
             Return a list of filter objects.
@@ -785,7 +794,7 @@ class BaseModelView(BaseView, ActionsMixin):
 
             for n in self.column_filters:
                 if self.is_valid_filter(n):
-                    collection.append(n)
+                    collection.append(self.handle_filter(n))
                 else:
                     flt = self.scaffold_filters(n)
                     if flt: