{"record":{"id":"917e135c33ae86ff","repo":"diesel-rs/diesel","slug":"no-field-with-column-name-column-name","errorCode":null,"errorMessage":"no field with column name `{column_name}`","messagePattern":"no field with column name `(.+?)`","errorType":"exception","errorClass":"syn::Error","httpStatus":null,"severity":"error","filePath":"diesel_derives/src/model.rs","lineNumber":170,"sourceCode":"            0 => from_ref(&self.name),\n            _ => &self.table_names,\n        }\n    }\n\n    pub fn fields(&self) -> &[Field] {\n        &self.fields\n    }\n\n    pub fn find_column(&self, column_name: &Ident) -> Result<&Field> {\n        self.fields()\n            .iter()\n            .find(|f| {\n                f.column_name()\n                    .map(|c| c == *column_name)\n                    .unwrap_or_default()\n            })\n            .ok_or_else(|| {\n                syn::Error::new(\n                    column_name.span(),\n                    format!(\"no field with column name `{column_name}`\"),\n                )\n            })\n    }\n\n    pub fn treat_none_as_default_value(&self) -> bool {\n        self.treat_none_as_default_value\n            .as_ref()\n            .map(|v| v.value())\n            .unwrap_or(true)\n    }\n\n    pub fn treat_none_as_null(&self) -> bool {\n        self.treat_none_as_null\n            .as_ref()\n            .map(|v| v.value())\n            .unwrap_or(false)","sourceCodeStart":152,"sourceCodeEnd":188,"githubUrl":"https://github.com/diesel-rs/diesel/blob/6fa6ed01b24b24248ab2a611698d0a7c6a2e9120/diesel_derives/src/model.rs#L152-L188","documentation":"`#[diesel(belongs_to)]` associations reference a foreign-key column by name; `find_column` in model.rs searches the parent struct's fields for one whose column name matches and, finding none, raises this error naming the missing column at the `belongs_to` argument's span (model.rs:170).","triggerScenarios":"`#[belongs_to(User, foreign_key = user_id)]` (or the default `user_id` inference) on a struct that has no field whose resolved column name equals `user_id` — e.g. the field is named `uid`, missing entirely, or `#[diesel(column_name)]` renames it.","commonSituations":"Renaming a foreign-key field without updating `belongs_to`; typos in `foreign_key = ...`; relying on `<table>_id` inference when the struct models a subset of columns; custom `column_name` attributes shifting the resolved name.","solutions":["Add a field matching the foreign-key column (e.g. `user_id: i32`) or fix its `column_name` attribute.","Correct the `foreign_key = ...` path in the `belongs_to` attribute to point at an existing field.","Check `#[diesel(column_name = ...)]` annotations so the resolved column name matches the one referenced."],"exampleFix":"// before\n#[derive(Identifiable, Associations)]\n#[belongs_to(User, foreign_key = user_id)]\n#[diesel(table_name = posts)]\nstruct Post { id: i32, uid: i32 }\n\n// after\n#[derive(Identifiable, Associations)]\n#[belongs_to(User, foreign_key = user_id)]\n#[diesel(table_name = posts)]\nstruct Post { id: i32, user_id: i32 }","handlingStrategy":"validation","validationCode":"// Verify the belongs_to foreign key resolves to a real field:\n// #[diesel(table_name = posts)]\n// #[belongs_to(User, foreign_key = user_id)]\n// struct Post { id: i32, user_id: i32 } // field must exist with that column name","typeGuard":null,"tryCatchPattern":null,"preventionTips":["Keep foreign-key field names in sync with `belongs_to` references (default inference is `<table>_id`).","Update `belongs_to` attributes whenever renaming fields.","Account for `#[diesel(column_name)]` renames when choosing the foreign_key argument."],"tags":["proc-macro","derive","associations","belongs-to","compile-time"],"backgroundTag":"resource-not-found","analyzedSha":"6fa6ed01b24b24248ab2a611698d0a7c6a2e9120","analyzedAt":"2026-09-07T01:50:13.074Z","contentChangedAt":"2026-09-07T01:50:13.074Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}