remove _ from methods.

Author: WaVEV

django_mongodb/compiler.py

@@ -172,9 +172,9 @@ def build_query(self, columns=None):
         """Check if the query is supported and prepare a MongoQuery."""
         self.check_query()
         query = self.query_class(self)
-        query.project_fields = self._get_project_fields(columns)
+        query.project_fields = self.get_project_fields(columns)
         query.lookup_pipeline = self.get_lookup_pipeline()
-        query.annotation_stage = self._get_group_pipeline()
+        query.annotation_stage = self.get_group_pipeline()
         try:
             query.mongo_query = {"$expr": self.query.where.as_mql(self, self.connection)}
         except FullResultSet:
@@ -279,7 +279,7 @@ def get_lookup_pipeline(self):
             result += self.query.alias_map[alias].as_mql(self, self.connection)
         return result
 
-    def _get_group_pipeline(self):
+    def get_group_pipeline(self):
         pipeline = None
         if any(isinstance(a, Aggregate) for a in self.query.annotations.values()):
             result = {}
@@ -320,7 +320,7 @@ def _get_group_pipeline(self):
 
         return pipeline
 
-    def _get_project_fields(self, columns=None):
+    def get_project_fields(self, columns=None):
         fields = {}
         for name, expr in columns or []:
             try: