#154: Make DB backend entity_type non-backend specific

- Instead of parsing an instance of something like `common.database.models.USER`, the field name is parsed into the DB backend function instead, and an instance of that entity is created in the DB backend functions, to make that data parsing non-backend specific

common/database/backend.py

@@ -16,7 +16,7 @@
     requires_session_id,
 )
 from common.helpers import queries_records
-from common.database.models import SESSION
+from common.database.models import EntityHelper, SESSION
 import uuid
 from common.exceptions import AuthenticationError
 import datetime
@@ -61,42 +61,50 @@ def logout(self, session_id):
 
     @requires_session_id
     @queries_records
-    def get_with_filters(self, session_id, table, filters):
+    def get_with_filters(self, session_id, entity_type, filters):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return get_rows_by_filter(table, filters)
 
     @requires_session_id
     @queries_records
-    def create(self, session_id, table, data):
+    def create(self, session_id, entity_type, data):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return create_rows_from_json(table, data)
 
     @requires_session_id
     @queries_records
-    def update(self, session_id, table, data):
+    def update(self, session_id, entity_type, data):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return patch_entities(table, data)
 
     @requires_session_id
     @queries_records
-    def get_one_with_filters(self, session_id, table, filters):
+    def get_one_with_filters(self, session_id, entity_type, filters):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return get_first_filtered_row(table, filters)
 
     @requires_session_id
     @queries_records
-    def count_with_filters(self, session_id, table, filters):
+    def count_with_filters(self, session_id, entity_type, filters):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return get_filtered_row_count(table, filters)
 
     @requires_session_id
     @queries_records
-    def get_with_id(self, session_id, table, id_):
+    def get_with_id(self, session_id, entity_type, id_):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return get_row_by_id(table, id_).to_dict()
 
     @requires_session_id
     @queries_records
-    def delete_with_id(self, session_id, table, id_):
+    def delete_with_id(self, session_id, entity_type, id_):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return delete_row_by_id(table, id_)
 
     @requires_session_id
     @queries_records
-    def update_with_id(self, session_id, table, id_, data):
+    def update_with_id(self, session_id, entity_type, id_, data):
+        table = EntityHelper.get_entity_object_from_name(entity_type)
         return update_row_from_id(table, id_, data)
 
     @requires_session_id