我在提交表单时清除会话哈希时遇到问题，无法弄清楚为什么会这样。情况如下：
我的应用程序中有几个模型，其中一个称为Plan。用户可以查看、编辑、删除或创建计划。当调用除视图之外的任何操作时，会出现一个表单，用户可以动态地将信息添加到计划中，并最终提交表单以在数据库中创建/更新计划。还根据用户的输入生成输出。这部分工作正常。
当我使用禁用的表单时会出现此问题。当用户单击以查看现有计划时，将调用show操作。在查看模式下，表单本质上是只读的，所以我禁用了除了提交按钮之外的所有表单元素。最初，表单不是只读的，如果不是，我没有任何问题。用户将能够查看计划并单击提交按钮以获得正确的输出。
现在，使用禁用的表单，用户可以执行相同的过程，但很明显无法修改表单的信息。当用户点击同一个提交按钮时，表单会被处理，但输出根本不会被渲染。
经过多次故障排除后，我设法弄清楚会话哈希由于某种原因被清除，导致某些逻辑无法正常工作。当用户点击查看计划时调用show动作，当点击 Submit 按钮时，接下来调用render_plan动作。对于render_plan操作，我没有任何 before_filters 。在显示操作中，我将session[:accessType]设置为“查看”。我已经验证了哈希实际上已设置。现在，当它移动到render_plan操作时，我检查了会话哈希，它被完全清除了。我似乎无法弄清楚为什么并且已经尝试了几个小时。
同样，当表单未被禁用时，一切正常。当表单以只读模式提交时，我不需要表单中的任何信息，因为我将所有数据库存储的信息用于计划，而不是提交的信息。此外，我已验证我的代码中没有语法/运行时错误。
有没有人知道为什么要清除会话哈希？我不会以任何方式清除它。提前感谢您的帮助！
编辑#1
可以在下面找到包含表单的我的“显示”html.erb 文件：
<% if session[:accessType] != "Create" %>
<% provide(:title, @savedPlan.name) %>
<h1 id="pagetitle"><%= session[:accessType] %>ing: <%= @savedPlan.name %></h1>
<% else %>
<% provide(:title, 'New Project Plan') %>
<h1 id="pagetitle">New Project Plan</h1>
<% end %>
<div id="form_errors">
<ul>
<li>Please correct the errors below:</li>
<li> </li>
</ul>
</div>
<h2 class="sectiontitle">Choose the project mode.</h2>
<%# Sets the correct project mode for the saved project plan %>
<% if !@savedPlan.nil? %>
<% if @savedPlan.projectMode == "variable" %>
<% varChecked = 'checked=checked' %>
<% else %>
<% fixedChecked = 'checked=checked' %>
<% end %>
<% else %>
<% varChecked = 'checked=checked' %>
<% end %>
<label class="radio inline radiolabel">
<input id="radVar" name="radMode" type="radio" value="Variable" tabindex="1" <%= if !varChecked.nil?; varChecked; end %>
onclick="OptionChoice();">
Variable
</label>
<label id="lblRadFixed" class="radio inline radiolabel">
<input id="radFixed" name="radMode" type="radio" value="Fixed" tabindex="2" <%= if !fixedChecked.nil?; fixedChecked; end %>
onclick="OptionChoice();">
Fixed
</label>
<div class="variable projectmode">
<%= form_tag({:controller => 'project_plans', :action => 'render_plan' },
{ :multipart => true, :id => 'frmvariableplan', :name => 'frmvariableplan', :class => 'form-inline' }) do %>
<input id="variable_project_mode" name="projectmode" value="variable" type="hidden">
<div class="row proj-start-end-date-div">
<div class="span4">
<%= label_tag :projname, "Project Name", :class => 'project_date_label biglbl biglbl-spacing' %>
<input class="proj-start-end-date input-spacing" name="projname" type="text" value="<%= if !@savedPlan.nil?; @savedPlan.name; end %>">
</div>
<div class="span4">
<%= label_tag :projstartdate, "Start Date", :class => 'project_date_label biglbl biglbl-spacing' %>
<input class="proj-start-end-date input-spacing datepicker read_only_input" name="projstartdate" type="text"
value="<%= if !@savedPlan.nil?; @savedPlan.startDate.strftime("%m/%d/%Y"); end %>" readonly="true">
</div>
<div class="span4">
<%= label_tag :projenddate, "End Date", :class => 'project_date_label biglbl biglbl-spacing' %>
<input class="proj-start-end-date" name="projenddate" type="text"
value="<%= if !@savedPlan.nil?; @savedPlan.endDate.strftime("%m/%d/%Y"); end %>" readonly="true">
</div>
</div>
<!-- Horizontal Rule to break the page up into sections -->
<hr />
<div>
<!-- Simple service type -->
<label name="lblServiceType_Simple" class="biglbl servicetypeheading">Service Type: Simple</label>
<div id="divServiceType_Simple" class="servicetypediv">
<%= render :partial => 'project_plans/display_services', :locals => { :type_service => 'simple' } %>
<%= render :partial => 'project_plans/add_service', :locals => { :service_type => 'simple' } %>
<% if !@savedPlan.nil? %>
<% service_array_length = (@all_services_array[0].count - 1) %>
<script type="text/javascript">
<% if (service_array_length >= 0) %>
CreateSlider("simple", "Total", 0, 144, <%= @all_services_array[0][0].totalHours %>);
CreateSlider("simple", "Design", 0, 64, <%= @all_services_array[0][0].designHours %>);
CreateSlider("simple", "Develop", 0, 80, <%= @all_services_array[0][0].developHours %>);
<% else %>
CreateSlider("simple", "Total", 0, 144, 144);
CreateSlider("simple", "Design", 0, 64, 64);
CreateSlider("simple", "Develop", 0, 80, 80);
<% end %>
</script>
<% (0..service_array_length).each do |i| %>
<% service = @all_services_array[0][i] %>
<%= render(:partial => 'project_plans/new_service',
:locals => { :type_service => 'simple', :type_count => (i + 1),
:service_name => service.name, :start_date => service.startDate.strftime("%m/%d/%Y"),
:end_date => service.endDate.strftime("%m/%d/%Y"),
:design_endDate => service.design_endDate.strftime("%m/%d/%Y"), :priority => service.priority,
:should_display_button => ((i != service_array_length) ? 'false' : 'true') }) %>
<% end %>
<% session[:simple] = @all_services_array[0].count %>
<% else %>
<script type="text/javascript">
CreateSlider("simple", "Total", 0, 144, 144);
CreateSlider("simple", "Design", 0, 64, 64);
CreateSlider("simple", "Develop", 0, 80, 80);
</script>
<% end %>
</div>
<!-- Horizontal Rule to break the page up into sections -->
<hr />
<!-- Medium service type -->
<label name="lblServiceType_Medium" class="biglbl servicetypeheading">Service Type: Medium</label>
<div id="divServiceType_Medium" class="servicetypediv">
<%= render :partial => 'project_plans/display_services', :locals => { :type_service => 'medium' } %>
<%= render :partial => 'project_plans/add_service', :locals => { :service_type => 'medium' } %>
<% if !@savedPlan.nil? %>
<% service_array_length = (@all_services_array[1].count - 1) %>
<script type="text/javascript">
<% if (service_array_length >= 0) %>
CreateSlider("medium", "Total", 145, 220, <%= @all_services_array[1][0].totalHours %>);
CreateSlider("medium", "Design", 0, 100, <%= @all_services_array[1][0].designHours %>);
CreateSlider("medium", "Develop", 0, 120, <%= @all_services_array[1][0].developHours %>);
<% else %>
CreateSlider("medium", "Total", 145, 220, 220);
CreateSlider("medium", "Design", 0, 100, 100);
CreateSlider("medium", "Develop", 0, 120, 120);
<% end %>
</script>
<% (0..service_array_length).each do |i| %>
<% service = @all_services_array[1][i] %>
<%= render(:partial => 'project_plans/new_service',
:locals => { :type_service => 'medium', :type_count => (i + 1),
:service_name => service.name, :start_date => service.startDate.strftime("%m/%d/%Y"),
:end_date => service.endDate.strftime("%m/%d/%Y"),
:design_endDate => service.design_endDate.strftime("%m/%d/%Y"), :priority => service.priority,
:should_display_button => ((i != service_array_length) ? 'false' : 'true') }) %>
<% end %>
<% session[:medium] = @all_services_array[1].count %>
<% else %>
<script type="text/javascript">
CreateSlider("medium", "Total", 145, 220, 220);
CreateSlider("medium", "Design", 0, 100, 100);
CreateSlider("medium", "Develop", 0, 120, 120);
</script>
<% end %>
</div>
<!-- Horizontal Rule to break the page up into sections -->
<hr />
<!-- Complex service type -->
<label name="lblServiceType_Complex" class="biglbl servicetypeheading">Service Type: Complex</label>
<div id="divServiceType_Complex" class="servicetypediv">
<%= render :partial => 'project_plans/display_services', :locals => { :type_service => 'complex' } %>
<%= render :partial => 'project_plans/add_service', :locals => { :service_type => 'complex' } %>
<% if !@savedPlan.nil? %>
<% service_array_length = (@all_services_array[2].count - 1) %>
<script type="text/javascript">
<% if (service_array_length >= 0) %>
CreateSlider("complex", "Total", 221, 295, <%= @all_services_array[2][0].totalHours %>);
CreateSlider("complex", "Design", 0, 135, <%= @all_services_array[2][0].designHours %>);
CreateSlider("complex", "Develop", 0, 160, <%= @all_services_array[2][0].developHours %>);
<% else %>
CreateSlider("complex", "Total", 221, 295, 295);
CreateSlider("complex", "Design", 0, 135, 135);
CreateSlider("complex", "Develop", 0, 160, 160);
<% end %>
</script>
<% (0..service_array_length).each do |i| %>
<% service = @all_services_array[2][i] %>
<%= render(:partial => 'project_plans/new_service',
:locals => { :type_service => 'complex', :type_count => (i + 1),
:service_name => service.name, :start_date => service.startDate.strftime("%m/%d/%Y"),
:end_date => service.endDate.strftime("%m/%d/%Y"),
:design_endDate => service.design_endDate.strftime("%m/%d/%Y"), :priority => service.priority,
:should_display_button => ((i != service_array_length) ? 'false' : 'true') }) %>
<% end %>
<% session[:complex] = @all_services_array[2].count %>
<% else %>
<script type="text/javascript">
CreateSlider("complex", "Total", 221, 295, 295);
CreateSlider("complex", "Design", 0, 135, 135);
CreateSlider("complex", "Develop", 0, 160, 160);
</script>
<% end %>
</div>
<!-- Horizontal Rule to break the page up into sections -->
<hr />
<!-- Incremental service type -->
<label name="lblServiceType_Incremental" class="biglbl servicetypeheading">Service Type: Incremental</label>
<div id="divServiceType_Incremental" class="servicetypediv">
<%= render :partial => 'project_plans/display_services', :locals => { :type_service => 'incremental' } %>
<%= render :partial => 'project_plans/add_service', :locals => { :service_type => 'incremental' } %>
<% if !@savedPlan.nil? %>
<% service_array_length = (@all_services_array[3].count - 1) %>
<script type="text/javascript">
<% if (service_array_length >= 0) %>
CreateSlider("incremental", "Total", 0, 40, <%= @all_services_array[3][0].totalHours %>);
CreateSlider("incremental", "Design", 0, 40, <%= @all_services_array[3][0].designHours %>);
CreateSlider("incremental", "Develop", 0, 40, <%= @all_services_array[3][0].developHours %>);
<% else %>
CreateSlider("incremental", "Total", 0, 40, 40);
CreateSlider("incremental", "Design", 0, 20, 20);
CreateSlider("incremental", "Develop", 0, 20, 20);
<% end %>
</script>
<% (0..service_array_length).each do |i| %>
<% service = @all_services_array[3][i] %>
<%= render(:partial => 'project_plans/new_service',
:locals => { :type_service => 'incremental', :type_count => (i + 1),
:service_name => service.name, :start_date => service.startDate.strftime("%m/%d/%Y"),
:end_date => service.endDate.strftime("%m/%d/%Y"),
:design_endDate => service.design_endDate.strftime("%m/%d/%Y"), :priority => service.priority,
:should_display_button => ((i != service_array_length) ? 'false' : 'true') }) %>
<% end %>
<% session[:incremental] = @all_services_array[3].count %>
<% else %>
<script type="text/javascript">
CreateSlider("incremental", "Total", 0, 40, 40);
CreateSlider("incremental", "Design", 0, 20, 20);
CreateSlider("incremental", "Develop", 0, 20, 20);
</script>
<% end %>
</div>
</div>
<!-- Horizontal Rule to break the page up into sections -->
<hr />
<!-- Resources section -->
<label name="lblResources" class="biglbl servicetypeheading">Resources</label>
<div id="resources" class="servicetypediv">
<%= render :partial => 'project_plans/add_resource' %>
<% if !@savedPlan.nil? %>
<% resource_array_length = (@all_resources_array.count - 1) %>
<% (0..resource_array_length).each do |i| %>
<% resource = @all_resources_array[i] %>
<%= render(:partial => 'project_plans/new_resource',
:locals => { :type_count => (i + 1), :resource_name => resource.name, :start_date => resource.startDate.strftime("%m/%d/%Y"),
:end_date => resource.endDate.strftime("%m/%d/%Y"), :resource_type => resource.resourceType,
:should_display_button => ((i != resource_array_length) ? 'false' : 'true') }) %>
<% end %>
<% session[:rescount] = @all_resources_array.count %>
<% end %>
</div>
<!-- Horizontal Rule to break the page up into sections -->
<hr />
<div>
<p class="biglbl">Notes:</p>
<textarea class="span6 textarea-spacing" name="txtNotes" rows="5"
placeholder="Enter any notes here"><%= if !@savedPlan.nil?; @savedPlan.notes; end %></textarea>
<input class="btn btn-primary btn-project-plan" value="<%= session[:accessType] %> Project Plan" type="button"
onclick="ValidateForm($('#frmvariableplan'))">
</div>
<div class="clearfix"></div>
<% end %>
</div>
<div class="fixed projectmode">
<%= form_tag({:controller => 'project_plans', :action => 'render_plan' },
{ :multipart => true, :id => 'frmfixedplan', :name => 'frmfixedplan', :class => 'form-inline' }) do %>
<input id="fixed_project_mode" name="projectmode" value="fixed" type="hidden">
<div class="row proj-start-end-date-div">
<div class="span4">
<%= label_tag :projname, "Project Name", :class => 'project_date_label biglbl biglbl-spacing' %>
<input class="proj-start-end-date input-spacing" name="projname" type="text">
</div>
<div class="span4">
<%= label_tag :projstartdate, "Start Date", :class => 'project_date_label biglbl biglbl-spacing' %>
<input class="proj-start-end-date input-spacing datepicker read_only_input" name="projstartdate" type="text" readonly="true">
</div>
<div class="span4">
<%= label_tag :projenddate, "End Date", :class => 'project_date_label biglbl biglbl-spacing' %>
<input class="proj-start-end-date" name="projenddate" type="text" readonly="true">
</div>
</div>
<% end %>
</div>
<% if session[:accessType] == "View" %>
<script type="text/javascript">
disableForm($('#frmvariableplan'));
</script>
<% end %>
* *答案* ***
我终于想通了！
这个问题是我通常不会想到的：真实性令牌。因为我的 JavaScript 函数基本上禁用了表单上的每个元素，Rails 默认实现的真实性检查也被禁用了。这意味着它们不会在 POST 请求时提交给服务器，Rails 会将不正确/缺失的真实性令牌解释为欺诈请求。在这种情况下，会清除会话信息以保护您的应用程序。
想象一下像 Twitter 或 Facebook 这样的网站，您可以在其中登录、发布内容等。由于用户的登录信息存储为会话，因此只有在发出欺诈请求时清除整个会话才有意义，因为这将有效地记录出用户。
为了解决这个问题，我只是在禁用表单上的所有元素后使用 JavaScript 启用了两个真实性输入框：
$(document.getElementsByName("utf8")[0]).attr('disabled', false);
$(document.getElementsByName("authenticity_token")[0]).attr('disabled', false);
那成功了！