Where to put constraint classes in Rails project

Question

Just curious about the best practices for Rails in where I put a custom constraints class that's used as a constraint in config/routes.rb. Seems like Rails.root/lib is where all user classes go. Is that appropriate for this? Should I be creating a directory inside for constraints? 2 empty directories exist there now, assets and tasks. Are there conventions for this?

Answer 1

lib/将是适当的地方.如果你想让它更干净,把它放进去lib/constraint/authenticated.rb并定义你的约束

module Constraint
  class Authenticated
    def matches?(request)
      # stuff
    end
  end
end

在你的 routes.rb

constraints Constraint::Authenticated.new do
  match 'account' => 'account#index'
end

Answer 2

奇怪的是,指南没有说明该路径,但是lib/constraints甚至列在API中(ActionDispatch :: Routing :: Mapper :: Scoping):

如果路由过于复杂,您可以将此逻辑移出到类中.此类必须在matches?其上定义一个方法,如果应该授予用户访问该路由的权限,则返回true;如果用户不应该访问,则返回false.

class Iphone
  def self.matches?(request)
    request.env["HTTP_USER_AGENT"] =~ /iPhone/
  end
end

此代码的预期位置是lib/constraints.