Simplify invalid chemical symbol error message

Materials-Consortia · Sep 23, 2021 · de90193 · de90193
1 parent 8ce8a26
commit de90193
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/optimade/models/structures.py b/optimade/models/structures.py
@@ -21,7 +21,7 @@
 )
 from optimade.server.warnings import MissingExpectedField
 
-EXTENDED_CHEMICAL_SYMBOLS = CHEMICAL_SYMBOLS + EXTRA_SYMBOLS
+EXTENDED_CHEMICAL_SYMBOLS = set(CHEMICAL_SYMBOLS + EXTRA_SYMBOLS)
 
 
 __all__ = (
@@ -146,7 +146,7 @@ class Species(BaseModel):
     @validator("chemical_symbols", each_item=True)
     def validate_chemical_symbols(cls, v):
         if not (v in EXTENDED_CHEMICAL_SYMBOLS):
-            raise ValueError(f"{v} MUST be in {EXTENDED_CHEMICAL_SYMBOLS}")
+            raise ValueError(f"{v} MUST be an element symbol, 'vacancy' or 'X'.")
         return v
 
     @validator("concentration", "mass")