module ActiveRecord
  module StrictValidations
    class Validation < Struct.new(:model, :field)
      # Inject validations into an ActiveRecord model
      def self.inject_validations(model, options = {})
        except = options[:except] || []
        model_columns = model.columns.dup.reject { |c| except.include?(c.name.to_sym) }

        if only = options[:only]
          model_columns = model_columns.select { |c| only.include?(c.name.to_sym) }
        end

        model_columns.each do |field|
          validation = "#{field.type.to_s.camelize}Validation"

          if ActiveRecord::StrictValidations::Validation.const_defined?(validation)
            "ActiveRecord::StrictValidations::Validation::#{validation}".constantize.new(model, field).apply
          end
        end
      end
    end
  end
end