remove broken write concern implementation

This code came from django-mongodb-engine and doesn't work with the
latest pymongo APIs.

Author: timgraham

django_mongodb/base.py

@@ -148,19 +148,10 @@ def __getattr__(self, attr):
 
     def _connect(self):
         settings_dict = self.settings_dict
-
-        options = settings_dict["OPTIONS"]
-        # TODO: review and document OPERATIONS: https://github.com/mongodb-labs/django-mongodb/issues/6
-        self.operation_flags = options.pop("OPERATIONS", {})
-        if not any(k in ["save", "delete", "update"] for k in self.operation_flags):
-            # Flags apply to all operations.
-            flags = self.operation_flags
-            self.operation_flags = {"save": flags, "delete": flags, "update": flags}
-
         self.connection = MongoClient(
             host=settings_dict["HOST"] or None,
             port=int(settings_dict["PORT"] or 27017),
-            **options,
+            **settings_dict["OPTIONS"],
         )
         db_name = settings_dict["NAME"]
         if db_name:

django_mongodb/compiler.py

@@ -517,8 +517,7 @@ def execute_sql(self, returning_fields=None):
     def insert(self, docs, returning_fields=None):
         """Store a list of documents using field columns as element names."""
         collection = self.get_collection()
-        options = self.connection.operation_flags.get("save", {})
-        inserted_ids = collection.insert_many(docs, **options).inserted_ids
+        inserted_ids = collection.insert_many(docs).inserted_ids
         return inserted_ids if returning_fields else []
 
 
@@ -582,15 +581,13 @@ def update(self, values):
         return self.execute_update(spec)
 
     @wrap_database_errors
-    def execute_update(self, update_spec, **kwargs):
+    def execute_update(self, update_spec):
         collection = self.get_collection()
         try:
             criteria = self.build_query().mongo_query
         except EmptyResultSet:
             return 0
-        options = self.connection.operation_flags.get("update", {})
-        options = dict(options, **kwargs)
-        return collection.update_many(criteria, update_spec, **options).matched_count
+        return collection.update_many(criteria, update_spec).matched_count
 
     def check_query(self):
         super().check_query()

django_mongodb/query.py

@@ -58,8 +58,7 @@ def __repr__(self):
     @wrap_database_errors
     def delete(self):
         """Execute a delete query."""
-        options = self.connection.operation_flags.get("delete", {})
-        return self.collection.delete_many(self.mongo_query, **options).deleted_count
+        return self.collection.delete_many(self.mongo_query).deleted_count
 
     @wrap_database_errors
     def get_cursor(self):