{"record":{"id":"b5e1c004b3012283","repo":"dbt-labs/dbt-core","slug":"this-must-be-a-baserelation-object","errorCode":null,"errorMessage":"this must be a BaseRelation object","messagePattern":"this must be a BaseRelation object","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/dbt-adapter/src/cast_util.rs","lineNumber":29,"sourceCode":"pub fn downcast_value_to_dyn_base_relation(\n    value: &minijinja::Value,\n) -> Result<Arc<dyn BaseRelation>, minijinja::Error> {\n    if let Some(relation_object) = value.downcast_object::<RelationObject>() {\n        Ok(relation_object.inner())\n    } else if let Some(relation_object) = value\n        .as_object()\n        .ok_or_else(|| {\n            minijinja::Error::new(\n                minijinja::ErrorKind::InvalidOperation,\n                \"relation must be an object\",\n            )\n        })?\n        .get_value(&minijinja::Value::from(THIS_RELATION_KEY))\n    {\n        Ok(relation_object\n            .downcast_object::<RelationObject>()\n            .ok_or_else(|| {\n                minijinja::Error::new(\n                    minijinja::ErrorKind::InvalidOperation,\n                    \"this must be a BaseRelation object\",\n                )\n            })?\n            .inner())\n    } else {\n        Err(minijinja::Error::new(\n            minijinja::ErrorKind::InvalidOperation,\n            format!(\n                \"Unsupported relation type ({}) in {}:{}\",\n                value,\n                file!(),\n                line!()\n            ),\n        ))\n    }\n}\n","sourceCodeStart":11,"sourceCodeEnd":47,"githubUrl":"https://github.com/dbt-labs/dbt-core/blob/0267ce9170576975b76b64ce856b2e5848e96617/crates/dbt-adapter/src/cast_util.rs#L11-L47","documentation":"The Jinja object being unwrapped exists, but the value stored under its __this__ key does not downcast to RelationObject — i.e. someone constructed a relation-like dict whose payload is not a BaseRelation wrapper, so the inner Arc<dyn BaseRelation> cannot be recovered.","triggerScenarios":"Thrown at crates/dbt-adapter/src/cast_util.rs:29 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Ensure the object stored under __this__ is a RelationObject wrapping a BaseRelation","Avoid hand-constructing relation-like dicts; use the Relation wrapper API","Type-check the __this__ payload before downcasting"],"exampleFix":null,"handlingStrategy":"type-guard","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0267ce9170576975b76b64ce856b2e5848e96617","analyzedAt":"2026-09-07T21:53:39.732Z","contentChangedAt":"2026-09-07T21:53:39.732Z","schemaVersion":2},"datasetVersion":"2026-09-17T15:17:12.973Z"}