不能註冊（錯誤「對象」的方法），無法登錄（爲「創建」方法錯誤）

Question

當我嘗試在我的本地主機簽約，這是我的錯誤：

NameError in Users#new 
Showing /Users/alonbond/rails_projects/sample_app/app/views/shared/_error_messages.html.erb where line #1 raised: 
undefined local variable or method `object' for #<#<Class:0x007f90a3c32d60>:0x007f90a3bf83b8> 
Extracted source (around line #1): 

    1: <% if object.errors.any? %> 
    2: <div id="error_explanation"> 
    3:  <h2> 
    4:  <%= pluralize(object.errors.count, "error") %> 

這是「新」

<h1>Sign up</h1> 

<%= form_for(@user) do |f| %> 
    <%= render 'shared/error_messages', :object => f.object %> 
    <%= render 'fields', :f => f %> 
    <div class="actions"> 
    <%= f.submit "Sign up" %> 
    </div> 

我的第二個問題是，當我嘗試登錄（我已報名前）代碼：

NoMethodError in SessionsController#create 
You have a nil object when you didn't expect it! 
You might have expected an instance of ActiveRecord::Base. 
The error occurred while evaluating nil.[] 

此爲 'create' 方法的代碼：

def create 
    user = User.authenticate(params[:session][:email], params[:session][:password]) 

    if user.nil? 
     flash.now[:error] = "Invalid email/password combination." 
     @title = "Sign in" 
     render 'new' 
    else 
     sign_in user 
     redirect_back_or user 
    end 
    end 

for_for：

<%= form_for(:session, :url => sessions_path) do |f| %> 
    <div class="field"> 
    <%= f.label :email %><br /> 
    <%= f.text_field :email %> 
    </div> 
    <div class="field"> 
    <%= f.label :password %><br /> 
    <%= f.password_field :password %> 
    </div> 
    <div class="actions"> 
    <%= f.submit "Sign in" %> 
    </div> 
<% end %> 

Answer 1

使用@user本地變量的部分，使用爲flash[:error]閃光燈消息。