before_action :require_user, only: require_user_before_actions

private

def require_user_before_actions
 actions = [:index, :edit, :update]
 actions << :show unless public?
 actions
end

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我发现的最简单的方法是：

before_action :require_user, only: [:index, :edit, :update]
before_action :require_user_when_no_public, unless: :public?, only: [:show]

protected 

def require_user_when_no_public
  require_user
end

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我只测试了一点点，所以不太确定它会工作，但也许是这样的：

before_action :require_user, if: ->(c) {
  [:index, :edit, :update, !public? && :show].include?(c.action_name.to_sym)
}

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作为一个可能愚蠢/破碎的（据我所知，这似乎在我的基本测试中起作用）替代方案，可能是这样的：

class <<self
  alias_method :old_before_action, :before_action
end

def self.before_action(*callbacks)
  options = callbacks.extract_options!
  if options[:only] && options[:only].is_a?(Proc)
    only_proc = options.delete(:only)
    if_proc = ->(c) { Array(only_proc.(c)).reject(&:blank?).map(&:to_s).to_set.include? c.action_name }
    options[:if] = Array(options[:if]).unshift(if_proc)
  end
  old_before_action(*callbacks, options)
end

before_action :require_user, only: ->(c) { [:index, :edit, :update, !public? && :show] }

型

如何将条件移动到方法体（和名称）？

before_action :require_user, only: [:index, :edit, :update]
before_action :require_user_unless_public, only: [:show]

private

def require_user_unless_public
  require_user unless public?
end

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最好使用except：

before_action :require_user, except: [:show]
before_action :require_user_unless_public, only: [:show]

型