深嵌套部分不识别局部变量

Question

在rails（4.2.3）app中，我有一个使用深嵌套部分的表单。我将两个变量（表单对象和设置字符串）作为局部数据链下的本地传递。链中的三个级别，部分不识别传入的变量。

的观点/帖/ new.html.erb

<%= form_for @post do |f| %>
  <% setting = get_setting %>
  ... 
  <%= render 'partials_folder/partial1', locals: { f: f, setting: setting } %>
  ...
<% end %>

# views/partials_folder/_partial1.html.erb
<%= render 'partials_folder/partial2', locals: { f: f, setting: setting } %>

# views/partials_folder/_partial2.html.erb
# f and setting are valid here
<%= f.inspect %> #=> <FormBuilder....>
<%= render 'partials_folder/partial3', locals: { f: f, setting: setting } %>

# views/partials_folder/_partial3.html.erb
# next line raises NameError "undefined local variable or method `f'"
<%= f.inspect %>

是否存在，可能是部分嵌套深度的限制，或者我是否正在达到堆栈大小的限制（因为表单对象被复制下来）？

Answer 1

在partial3中，您可以通过local_assigns[:locals][:f]或local_assigns[:locals][:settings]

访问本地变量

或者您可以在视图中使用render partial: "partial_name", locals: {locals}，这样您就可以

<%= form_for @post do |f| %>
  <% setting = get_setting %>
  ... 
  <%= render partial: 'partials_folder/partial1', locals: { f: f, setting: setting } %>
  ...
<% end %>

# views/partials_folder/_partial1.html.erb
<%= render partial: 'partials_folder/partial2', locals: { f: f, setting: setting } %>

# views/partials_folder/_partial2.html.erb

<%= render partial: 'partials_folder/partial3', locals: { f: f, setting: setting } %>

# views/partials_folder/_partial3.html.erb

<%= f.inspect %>