为什么我收到“找不到表‘用户’”错误？

Question

我对 Rails 比较陌生，每次测试登录页面时都会遇到上述错误。 这是测试视图文件：

<%= form_for :user, :url => create_path do |f| %>
  <p> Email: <br />  <%= f.text_field :email %></p>
  <p> Password: <br />  <%= f.password_field :password %></p>
  <p><%= submit_tag "Sign In", :disable_with => "Please wait...", :class => "btn primary" %></p>
<% end %>

这是用户控制器：

class UsersController < ApplicationController   
  before_filter :get_user, :except => [:register, :login, :create]
  before_filter :user_signed_in?, :only => [:delete]

  def create
    if user = User.find_by_email(params[:user][:email]).try(:authenticate, params[:user][:password])
      session[:user_id] = user.id
      redirect_to root_path # Or whatever you want i.e. redirect_to user
    else
      render :new, :flash => { :error => "Bad email/password combination" }
    end
  end

  def delete
    session.delete(:user_id)
  end

  def register
    if Invite.find_by_hash(params[:hash]).blank?
      redirect_to root_path
      return
    end
    @user = User.new(params[:user])
    if(request.post? and @user.save)
      flash[:notice] = "Account Created Successfully"
      redirect_to root_path      
      return
    else
      flash.now[:warning] = @user.errors.full_messages
    end
  end

  def destroy
    @user = User.find(params[:id])
    @user.destroy
    redirect_to root_path
  end

  def login

  end

  def get_user
    @user = User.find(params[:id])
  end

end

还有我的用户模型：

class User < ActiveRecord::Base
  has_secure_password
  validates :email, :presence => true, :uniqueness => true, :length => {:minimum => 6}
  validates_format_of :email, :with => /^([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})$/i
  validates :name, :presence => true, :length => {:maximum => 32}
  validates :password, :presence => true, :length => {:minimum => 8}
  validates :username, :presence => true, :length => {:maximum => 20}, :uniqueness => true
  validates :blog, :uniqueness => true
  has_many :posts
end

我得到的确切错误是：

ActiveRecord::StatementInvalid in UsersController#create
Could not find table 'users'

P.S.：我正在运行 Rails 3.1.0.rc8。任何帮助，将不胜感激。谢谢。

更新：我似乎找不到任何表。我刚刚升级到 Rails 3.1，在那之前一切都很好。

Answer 1

如果您刚刚升级到 Rails 3.1 并且在升级之前一切正常，请检查您的 database.yml 配置。我怀疑配置是否因为升级而回到默认值。

如果没有，请遵循 Rajkamal 的建议并确保运行迁移。