我在rake routes后结果如下
root / projects#index
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) devise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
admin_root /admin(.:format) admin/base#index
admin_users GET /admin/users(.:format) admin/users#index
POST /admin/users(.:format) admin/users#create
new_admin_user GET /admin/users/new(.:format) admin/users#new
edit_admin_user GET /admin/users/:id/edit(.:format) admin/users#edit
admin_user GET /admin/users/:id(.:format) admin/users#show
PUT /admin/users/:id(.:format) admin/users#update
DELETE /admin/users/:id(.:format) admin/users#destroy
admin_permissions GET /admin/permissions(.:format) admin/permissions#index
POST /admin/permissions(.:format) admin/permissions#create
new_admin_permission GET /admin/permissions/new(.:format) admin/permissions#new
edit_admin_permission GET /admin/permissions/:id/edit(.:format) admin/permissions#edit
admin_permission GET /admin/permissions/:id(.:format) admin/permissions#show
PUT /admin/permissions/:id(.:format) admin/permissions#update
DELETE /admin/permissions/:id(.:format) admin/permissions#destroy
confirm_user GET /awaiting_confirmation(.:format) users#confirmation
update_user_permissions PUT /admin/user/:user_id/permissions(.:format) admin/permissions#update
project_tickets GET /projects/:project_id/tickets(.:format) tickets#index
POST /projects/:project_id/tickets(.:format) tickets#create
new_project_ticket GET /projects/:project_id/tickets/new(.:format) tickets#new
edit_project_ticket GET /projects/:project_id/tickets/:id/edit(.:format) tickets#edit
project_ticket GET /projects/:project_id/tickets/:id(.:format) tickets#show
PUT /projects/:project_id/tickets/:id(.:format) tickets#update
DELETE /projects/:project_id/tickets/:id(.:format) tickets#destroy
projects GET /projects(.:format) projects#index
POST /projects(.:format) projects#create
new_project GET /projects/new(.:format) projects#new
edit_project GET /projects/:id/edit(.:format) projects#edit
project GET /projects/:id(.:format) projects#show
PUT /projects/:id(.:format) projects#update
DELETE /projects/:id(.:format) projects#destroy
结果显示主页不是projects#index
怎么会出现http://localhost:3000/ 的网页生成了 过多的重定向。清除此网站的 Cookie 或允许第三方 Cookie 可能会解决该问题。如果 不能解决，可能是服务器配置有问题，而不是您的 计算机有问题。
把 projects#index 的代码贴出来看一下，若是我没猜错的话，你应该是遇到了multiple render / redirect error 这类的问题。
def index
@projects = Project.for(current_user).all
end
private
def find_project
@project = Project.for(current_user).find(params[:id])
rescue ActiveRecord::RecordNotFound
flash[:alert] = "The project you were looking" + "for could not be found"
redirect_to root_path
end
def self.for(user)
user.admin? ? Project : project.readable_by(user)
end