GuardedStruct.Derive.Extension

derives

Container for custom validator and sanitizer ops.

defmodule MyApp.Derives do use GuardedStruct.Derive.Extension

derives do validator :slug, fn input -> is_binary(input) and Regex.match?(~r/^[a-z0-9-]+$/, input) end

sanitizer :slugify, fn input when is_binary(input) -> input |> String.downcase() |> String.replace(~r/[^a-z0-9-]+/u, "-") end end end

validator name, fun

Declare a custom validator op callable as validate(<name>) from any GuardedStruct module that has this extension wired in.

Name	Type	Default	Docs
`name`	`atom`		Op name. Used as `validate(<name>)` in derive strings.
`fun`	`any`		Single-arg function. Return value semantics: `true` — input passes `false` — input fails (default error message) `{:error, field, action, message}` — explicit error any other value — used as the validated (coerced) output

sanitizer name, fun

Declare a custom sanitizer op callable as sanitize(<name>). Runs before validation in the derive pipeline; the return value replaces the input.

Name	Type	Default	Docs
`name`	`atom`		Op name. Used as `sanitize(<name>)` in derive strings.
`fun`	`any`		Single-arg function. Return value replaces the input.