Server: minor model.py data_source_by_id name update

Author: dshemetov

src/server/endpoints/covidcast_utils/model.py

@@ -202,7 +202,7 @@ def _load_data_sources():
 
 
 data_sources, data_sources_df = _load_data_sources()
-data_source_by_id = {d.source: d for d in data_sources}
+data_sources_by_id = {d.source: d for d in data_sources}
 
 
 def _load_data_signals(sources: List[DataSource]):
@@ -231,7 +231,7 @@ def _load_data_signals(sources: List[DataSource]):
 data_signals_by_key = {d.key: d for d in data_signals}
 # also add the resolved signal version to the signal lookup
 for d in data_signals:
-    source = data_source_by_id.get(d.source)
+    source = data_sources_by_id.get(d.source)
     if source and source.uses_db_alias:
         data_signals_by_key[(source.db_source, d.signal)] = d
 
@@ -261,7 +261,7 @@ def create_source_signal_alias_mapper(source_signals: List[SourceSignalSet]) ->
     alias_to_data_sources: Dict[str, List[DataSource]] = {}
     transformed_sets: List[SourceSignalSet] = []
     for ssset in source_signals:
-        source = data_source_by_id.get(ssset.source)
+        source = data_sources_by_id.get(ssset.source)
         if not source or not source.uses_db_alias:
             transformed_sets.append(ssset)
             continue