我在使用pg数据库的现有应用程序中安装了activeadmin。
当我访问以下网址时： http://localhost:3000/admin 我收到了一个错误信息：
尝试重新安装activeadmin，但这并没有解决问题。
我的routs.rb文件内容如下：
当我访问以下网址时： http://localhost:3000/admin 我收到了一个错误信息：
未初始化常量 AdminController
我在安装activeadmin后执行了rake db:migrate命令。尝试重新安装activeadmin，但这并没有解决问题。
我的routs.rb文件内容如下：
Rails.application.routes.draw do
devise_for :admin_users, ActiveAdmin::Devise.config
resources :admin
resources :posts
resources :categories
resources :statuses
root :to => "home#index"
ActiveAdmin.routes(self)
# For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
end
Gemfile：
source 'https://rubygems.org'
git_source(:github) do |repo_name|
repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
"https://github.com/#{repo_name}.git"
end
# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.1.4'
# Use sqlite3 as the database for Active Record
# gem 'sqlite3'
gem 'pg'
gem 'activeadmin', github: 'activeadmin'
gem 'devise'
gem 'cancan' # or cancancan
gem 'draper'
gem 'pundit'
# Use Puma as the app server
gem 'puma', '~> 3.7'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 3.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development
group :development, :test do
# Call 'byebug' anywhere in the code to stop execution and get a debugger console
gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
# Adds support for Capybara system testing and selenium driver
gem 'capybara', '~> 2.13'
gem 'selenium-webdriver'
end
group :development do
# Access an IRB console on exception pages or by using <%= console %> anywhere in the code.
gem 'web-console', '>= 3.3.0'
gem 'listen', '>= 3.0.5', '< 3.2'
# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring'
gem 'spring-watcher-listen', '~> 2.0.0'
end
# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
Gemfile.lock:
GIT
remote: https://github.com/activeadmin/activeadmin.git
revision: b1901e8ba6c9a024018a1803c26375b9cb971add
specs:
activeadmin (2.0.0.alpha)
arbre (>= 1.1.1)
formtastic (~> 3.1)
formtastic_i18n
inherited_resources (~> 1.7)
jquery-rails (>= 4.2.0)
kaminari (>= 1.0.1)
railties (>= 4.2, < 5.2)
ransack (~> 1.3)
sass (~> 3.4)
sprockets (>= 3.0, < 4.1)
sprockets-es6 (>= 0.9.2)
GEM
remote: https://rubygems.org/
specs:
actioncable (5.1.4)
actionpack (= 5.1.4)
nio4r (~> 2.0)
websocket-driver (~> 0.6.1)
actionmailer (5.1.4)
actionpack (= 5.1.4)
actionview (= 5.1.4)
activejob (= 5.1.4)
mail (~> 2.5, >= 2.5.4)
rails-dom-testing (~> 2.0)
actionpack (5.1.4)
actionview (= 5.1.4)
activesupport (= 5.1.4)
rack (~> 2.0)
rack-test (>= 0.6.3)
rails-dom-testing (~> 2.0)
rails-html-sanitizer (~> 1.0, >= 1.0.2)
actionview (5.1.4)
activesupport (= 5.1.4)
builder (~> 3.1)
erubi (~> 1.4)
rails-dom-testing (~> 2.0)
rails-html-sanitizer (~> 1.0, >= 1.0.3)
activejob (5.1.4)
activesupport (= 5.1.4)
globalid (>= 0.3.6)
activemodel (5.1.4)
activesupport (= 5.1.4)
activemodel-serializers-xml (1.0.2)
activemodel (> 5.x)
activesupport (> 5.x)
builder (~> 3.1)
activerecord (5.1.4)
activemodel (= 5.1.4)
activesupport (= 5.1.4)
arel (~> 8.0)
activesupport (5.1.4)
concurrent-ruby (~> 1.0, >= 1.0.2)
i18n (~> 0.7)
minitest (~> 5.1)
tzinfo (~> 1.1)
addressable (2.5.2)
public_suffix (>= 2.0.2, < 4.0)
arbre (1.1.1)
activesupport (>= 3.0.0)
arel (8.0.0)
babel-source (5.8.35)
babel-transpiler (0.7.0)
babel-source (>= 4.0, < 6)
execjs (~> 2.0)
bcrypt (3.1.11)
bindex (0.5.0)
builder (3.2.3)
byebug (9.1.0)
cancan (1.6.10)
capybara (2.16.0)
addressable
mini_mime (>= 0.1.3)
nokogiri (>= 1.3.3)
rack (>= 1.0.0)
rack-test (>= 0.5.4)
xpath (~> 2.0)
childprocess (0.8.0)
ffi (~> 1.0, >= 1.0.11)
coffee-rails (4.2.2)
coffee-script (>= 2.2.0)
railties (>= 4.0.0)
coffee-script (2.4.1)
coffee-script-source
execjs
coffee-script-source (1.12.2)
concurrent-ruby (1.0.5)
crass (1.0.3)
devise (4.3.0)
bcrypt (~> 3.0)
orm_adapter (~> 0.1)
railties (>= 4.1.0, < 5.2)
responders
warden (~> 1.2.3)
draper (3.0.1)
actionpack (~> 5.0)
activemodel (~> 5.0)
activemodel-serializers-xml (~> 1.0)
activesupport (~> 5.0)
request_store (~> 1.0)
erubi (1.7.0)
execjs (2.7.0)
ffi (1.9.18)
formtastic (3.1.5)
actionpack (>= 3.2.13)
formtastic_i18n (0.6.0)
globalid (0.4.1)
activesupport (>= 4.2.0)
has_scope (0.7.1)
actionpack (>= 4.1, < 5.2)
activesupport (>= 4.1, < 5.2)
i18n (0.9.1)
concurrent-ruby (~> 1.0)
inherited_resources (1.7.2)
actionpack (>= 3.2, < 5.2.x)
has_scope (~> 0.6)
railties (>= 3.2, < 5.2.x)
responders
jbuilder (2.7.0)
activesupport (>= 4.2.0)
multi_json (>= 1.2)
jquery-rails (4.3.1)
rails-dom-testing (>= 1, < 3)
railties (>= 4.2.0)
thor (>= 0.14, < 2.0)
kaminari (1.1.1)
activesupport (>= 4.1.0)
kaminari-actionview (= 1.1.1)
kaminari-activerecord (= 1.1.1)
kaminari-core (= 1.1.1)
kaminari-actionview (1.1.1)
actionview
kaminari-core (= 1.1.1)
kaminari-activerecord (1.1.1)
activerecord
kaminari-core (= 1.1.1)
kaminari-core (1.1.1)
listen (3.1.5)
rb-fsevent (~> 0.9, >= 0.9.4)
rb-inotify (~> 0.9, >= 0.9.7)
ruby_dep (~> 1.2)
loofah (2.1.1)
crass (~> 1.0.2)
nokogiri (>= 1.5.9)
mail (2.7.0)
mini_mime (>= 0.1.1)
method_source (0.9.0)
mini_mime (1.0.0)
mini_portile2 (2.3.0)
minitest (5.10.3)
multi_json (1.12.2)
nio4r (2.1.0)
nokogiri (1.8.1)
mini_portile2 (~> 2.3.0)
orm_adapter (0.5.0)
pg (0.21.0)
polyamorous (1.3.1)
activerecord (>= 3.0)
public_suffix (3.0.1)
puma (3.10.0)
pundit (1.1.0)
activesupport (>= 3.0.0)
rack (2.0.3)
rack-test (0.7.0)
rack (>= 1.0, < 3)
rails (5.1.4)
actioncable (= 5.1.4)
actionmailer (= 5.1.4)
actionpack (= 5.1.4)
actionview (= 5.1.4)
activejob (= 5.1.4)
activemodel (= 5.1.4)
activerecord (= 5.1.4)
activesupport (= 5.1.4)
bundler (>= 1.3.0)
railties (= 5.1.4)
sprockets-rails (>= 2.0.0)
rails-dom-testing (2.0.3)
activesupport (>= 4.2.0)
nokogiri (>= 1.6)
rails-html-sanitizer (1.0.3)
loofah (~> 2.0)
railties (5.1.4)
actionpack (= 5.1.4)
activesupport (= 5.1.4)
method_source
rake (>= 0.8.7)
thor (>= 0.18.1, < 2.0)
rake (12.2.1)
ransack (1.8.4)
actionpack (>= 3.0)
activerecord (>= 3.0)
activesupport (>= 3.0)
i18n
polyamorous (~> 1.3)
rb-fsevent (0.10.2)
rb-inotify (0.9.10)
ffi (>= 0.5.0, < 2)
request_store (1.3.2)
responders (2.4.0)
actionpack (>= 4.2.0, < 5.3)
railties (>= 4.2.0, < 5.3)
ruby_dep (1.5.0)
rubyzip (1.2.1)
sass (3.5.3)
sass-listen (~> 4.0.0)
sass-listen (4.0.0)
rb-fsevent (~> 0.9, >= 0.9.4)
rb-inotify (~> 0.9, >= 0.9.7)
sass-rails (5.0.6)
railties (>= 4.0.0, < 6)
sass (~> 3.1)
sprockets (>= 2.8, < 4.0)
sprockets-rails (>= 2.0, < 4.0)
tilt (>= 1.1, < 3)
selenium-webdriver (3.7.0)
childprocess (~> 0.5)
rubyzip (~> 1.0)
spring (2.0.2)
activesupport (>= 4.2)
spring-watcher-listen (2.0.1)
listen (>= 2.7, < 4.0)
spring (>= 1.2, < 3.0)
sprockets (3.7.1)
concurrent-ruby (~> 1.0)
rack (> 1, < 3)
sprockets-es6 (0.9.2)
babel-source (>= 5.8.11)
babel-transpiler
sprockets (>= 3.0.0)
sprockets-rails (3.2.1)
actionpack (>= 4.0)
activesupport (>= 4.0)
sprockets (>= 3.0.0)
thor (0.20.0)
thread_safe (0.3.6)
tilt (2.0.8)
turbolinks (5.0.1)
turbolinks-source (~> 5)
turbolinks-source (5.0.3)
tzinfo (1.2.4)
thread_safe (~> 0.1)
uglifier (3.2.0)
execjs (>= 0.3.0, < 3)
warden (1.2.7)
rack (>= 1.0)
web-console (3.5.1)
actionview (>= 5.0)
activemodel (>= 5.0)
bindex (>= 0.4.0)
railties (>= 5.0)
websocket-driver (0.6.5)
websocket-extensions (>= 0.1.0)
websocket-extensions (0.1.3)
xpath (2.1.0)
nokogiri (~> 1.3)
PLATFORMS
ruby
DEPENDENCIES
activeadmin!
byebug
cancan
capybara (~> 2.13)
coffee-rails (~> 4.2)
devise
draper
jbuilder (~> 2.5)
listen (>= 3.0.5, < 3.2)
pg
puma (~> 3.7)
pundit
rails (~> 5.1.4)
sass-rails (~> 5.0)
selenium-webdriver
spring
spring-watcher-listen (~> 2.0.0)
turbolinks (~> 5)
tzinfo-data
uglifier (>= 1.3.0)
web-console (>= 3.3.0)
BUNDLED WITH
1.16.0
我理解问题出在缺少AdminController文件，但据我所知，即使没有该文件也应该可以正常工作。而且我是在Mac上进行操作。
rm -rf Gemfile.lock && gem uninstall activeadmin && bundle- Sebastián Palma