Module violation 

The shape of a refused write: one Violation per broken rule, each with the field it concerns, a stable code, the values the rule was checked against, and a sentence a person can act on.

{ "success": false,
  "error": "validation failed: field_not_writable: `status` …",
  "violations": [
    { "path": "status", "code": "field_not_writable", "params": {}, "message": "…" } ] }

The error string stays, so a client that reads only it keeps working; a form reads violations to mark each field by its code. A violation the database raises carries the same code as the application-side check, read from the constraint’s name (see code_from_constraint).

Structs

Violation

One broken rule.

Functions

code_from_constraint

The rule code a database constraint stands for.