redirect_to的参数数目错误（0..1为2）

Question

Error image

argument error

home_controller.rb

class HomeController < ApplicationController

def home
 @activities = Activity.order("created_at DESC").page(params[:page]).per_page(5)
end

def login
  render 
end

def logout
  session[:school_id] = nil
  session[:parent_id] = nil
  session[:user_id] = nil

  redirect_to :controller => 'home', :action => 'login'
end

Gemfile

source 'https://rubygems.org'
gem 'rails', '4.2.4'
gem 'mysql2', '~> 0.3.20'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.1.0'
gem 'remotipart', '~> 1.2'
gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'bootstrap-sass', '~> 3.3.5'
gem 'sass-rails', '~> 5.0'
gem 'bootstrap_form'
gem 'devise', '~> 3.5', '>= 3.5.2'
gem 'bartt-ssl_requirement', '~>1.4.0', :require => 'ssl_requirement'
gem 'will_paginate'
gem 'paperclip'
gem 'bcrypt', '~> 3.1.7'
group :development, :test do
 console
  gem 'byebug'
end

Answer 1

redirect_to :controller => 'home', :action => 'login'

This is not correct, not to mention ugly. Instead, create a route in routes.rb that does that action. For example:

get 'login' => 'home#login'

Then you would use:

redirect_to login_path

BONUS

****You should read up on rails routing to make better routes too.****

Also, a home controller that handles logins does not seem very clean.

A better route would be something like the following but it requires different controller setup:

resources :sessions

which creates the following route and many others(not exactly but lets ignore the details):

get 'login' => 'sessions#new'

Again, I recommend you read up on Rails routing .

Answer 2

It looks to me that you may have had your code written incorrectly initially, and even though you've fixed the source code, Rails is still using the old (incorrect) version.

You must have had some variant of:

redirect_to 'home', :action => 'login'
redirect_to 'home', 'login'

before.

Leave your code the way you have it ( redirect_to(:controller => 'home', :action => 'login') ), and make sure you restart your Rails process correctly.

Answer 3

只是为了解释redirect_to实际上期望的是路径而不是控制器或动作，Helsing非常漂亮地回答了如何从控制器及其动作中做出路由。