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Diffstat (limited to 'lib/sqlalchemy/mapping/properties.py')
| -rw-r--r-- | lib/sqlalchemy/mapping/properties.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/sqlalchemy/mapping/properties.py b/lib/sqlalchemy/mapping/properties.py index 61bb3da36..01c0921b7 100644 --- a/lib/sqlalchemy/mapping/properties.py +++ b/lib/sqlalchemy/mapping/properties.py @@ -164,6 +164,8 @@ class PropertyLoader(MapperProperty): self.key = key self.parent = parent + if self.secondaryjoin is not None and self.secondary is None: + raise ValueError("Property '" + self.key + "' specified with secondary join condition but no secondary argument") # if join conditions were not specified, figure them out based on foreign keys if self.secondary is not None: if self.secondaryjoin is None: |