ruby-on-rails – 设计 – 如果数据库中不存在该电子邮件,则忘记

当用户点击忘记密码时,会将他们带到忘记密码页面,并带有一个字段供他们输入他们的电子邮件地址.如果他们的电子邮件地址在数据库中,一切都很好,但如果数据库中不存在电子邮件地址,它只会重定向到同一页面,但不会显示错误消息.

如何显示错误消息？

/view/devise/passwords/new.html.erb

...
<%= form_for(resource,:as => resource_name,:url => password_path(resource_name),:html => { :method => :post }) do |f| %>
    <h1>Reset Password</h1>     

    <div class="login-fields">

        <p>Instructions on resetting your password will be emailed to you.</p>

        <%= render :partial => '/shared/messages' %>

        <div class="field">
            <%= f.label :email %>
            <%= f.email_field :email,:placeholder => 'Email',:class => 'login username-field' %>
        </div> <!-- /field -->

    </div> <!-- /login-fields -->

    <div class="login-actions">

        <%= content_tag(:button,:type=>:submit,:class => "button btn btn-secondary btn-large") do %>
            Send me reset password instructions
        <% end %>

    </div> <!-- .actions -->

    <div class="login-social">
        <%= render "devise/shared/links" %>
    </div>

<% end %>
...

/views/shared/_messages.html.erb

<% if alert || flash[:alert] || flash[:error] %>
    <div class="alert alert-error">
        <a class="close" data-dismiss="alert" href="#">x</a>
        <h4 class="alert-heading">Error!</h4>
        <%= alert %>
        <%= flash[:error] %>
    </div>
<% end %>

<% if flash[:success] || notice || flash[:notice]%>
    <div class="alert alert-success">
        <a class="close" data-dismiss="alert" href="#">x</a>
        <h4 class="alert-heading">Success!</h4>
        <%= flash[:success] %>
        <%= notice %>
    </div>
<% end %>

<% if alert || flash[:alert] || flash[:error] %>
    <div class="alert alert-error">
      <a class="close" data-dismiss="alert" href="#">x</a>
      <h4 class="alert-heading">Error!</h4>
      <%= alert %>
      <%= flash[:error] %>
    </div>
<% end %>
<% if model.errors.any? %>
    <div class="alert alert-error">
      <a class="close" data-dismiss="alert" href="#">x</a>
      <h4 class="alert-heading">Error!</h4>
      <ul>
        <% model.errors.full_messages.each do |msg| %>
            <li>* <%= msg %></li>
        <% end %>
      </ul>
    </div>
<% end %>
<% if flash[:success] || notice || flash[:notice]%>
    <div class="alert alert-success">
      <a class="close" data-dismiss="alert" href="#">x</a>
      <h4 class="alert-heading">Success!</h4>
      <%= flash[:success] %>
      <%= notice %>
    </div>
<% end %>

<%= render '/shared/messages',model: resource %>