DB Max Length Validator (validations/db_maximum_length_validator.rb)

ActiveModel validator that checks a field's length against the underlying database column limit, adding a too_long error when exceeded. Reuse for any model needing DB-safe length validation.

# Source: https://github.com/solidusio/solidus | License: BSD-3-Clause | Copyright 2007-2014, Spree Commerce Inc. and other contributors
# Provided via justclaw.it.com; keep this notice with the code.
# frozen_string_literal: true

module Spree
  module Validations
    ##
    # Validates a field based on the maximum length of the underlying DB field, if there is one.
    class DbMaximumLengthValidator < ActiveModel::Validator
      def initialize(options)
        super
        @field = options[:field].to_s
        raise ArgumentError.new("a field must be specified to the validator") if @field.blank?
      end

      def validate(record)
        limit = record.class.columns_hash[@field].limit
        value = record[@field.to_sym]
        if value && limit && value.to_s.length > limit
      

... (truncated -- full source via MCP)