Module: StructuredParams::Validations

Extended by:

ActiveSupport::Concern

Included in:

Params

Defined in:

lib/structured_params/validations.rb

Overview

Provides validates_raw which validates raw parameter values before type casting.

Internally delegates to ActiveModel’s validates on the _before_type_cast attribute, then remaps errors back to the original attribute name. This means all standard ActiveModel validators (format, numericality, etc.) work as-is on the raw input value.

Example:

class UserParams < StructuredParams::Params
  attribute :age, :integer
  validates_raw :age, format: { with: /\A\d+\z/, message: 'must be numeric string' }
end

params = UserParams.new(age: "abc")
params.valid?            # => false
params.errors[:age]      # => ["must be numeric string"]