rails登录示例（ruby1.9.2 ，…

login action

def login

   uname=params[:user][:name]

   upass=params[:user][:pass]

    user=User.find_by_name_and_pass(uname,upass)

    session[:user_id] =nil

    if user

     session[:user_id] = user.id

     redirect_to "/users/index" , :notice => "loginsuccessfully!"

    else

     redirect_to "/users/dealfail" , :notice =>"failed!"

    end

  end

login1.html.erb

<%= form_tag :controller =>"users", :action => "login" do%>

<tr>

<td align="right"height="30">username:</td>

<td align="middle" colSpan="2"height="30">

<%=text_field :user,:name,:class=> "txt" %>

</td>

</tr>

<tr>

<td align="right"height="30">password:</td>

<td align="middle" colSpan="2"height="30">

<%= text_field :user, :pass, :class=> "txt" %></td>

 </tr>

 <tr>

  <tdcolspan="2">&nbsp;&nbsp;

  <%= submit_tag 'login',:class => "btn" , :value=> "submit"%></td>

<td class="style2">&nbsp;&nbsp;

<input type="reset" value="cancel" class="btn"name="reset"></td>

</tr>

<% end %>