异常处理

一、使用rescue_action_in_public

 

 

class PostsController < ApplicationController
  def rescue_action_in_public(exception)
    case(exception)
      when ActiveRecord::RecordNotFound then render :file => '/bad_record'
      when NoMethodError then render :file => '/no_method'
      else render :file => '/error'
    end
  end
end

 

二、使用rescue_from

 

 

class PostsController < ApplicationController

  # Declare exception to handler methods
  rescue_from ActiveRecord::RecordNotFound, :with => :bad_record
  rescue_from NoMethodError, :with => :show_error

  def bad_record; render :file => '/bad_record'; end
  def show_error(exception); render :text => exception.message; end

end

 

使用rescue_from处理异常时，你还可以使用block或者proc。

 

 

class PostsController < ApplicationController

  # Declare exception to handler methods
  rescue_from(ActiveRecord::RecordNotFound) { |e| render :file => '/bad_record' }
  rescue_from NoMethodError, :with => proc { |e| render :text => e.message }

end