Rails slim form_for 标签

Question

从常规 ERB 切换到纤薄文件后，我无法让表单工作。这是我想要实现纤细渲染的表单：

= form_for @student, :url => students_path(@student), method: :post do |f|
    = f.hidden_field :student_id, :value => current_user.id
    = f.hidden_field :course_id, :value => group.id
    = submit_tag "Join this Class!", :class => "btn btn-primary pull-right join-button"

这是常规 ERB 文件中的工作代码

<%= form_for @student, :url => students_path(@student), method: :post do |f| %>
    <%= f.hidden_field :student_id, :value => current_user.id %>
    <%= f.hidden_field :course_id, :value => group.id %>
    <%= submit_tag "+ Join", :class => "btn btn-primary pull-right join-button" %>
<% end %>

这是我目前遇到的错误：

undefined local variable or method `f'

Answer 1

slim 的最大问题是缩进试试这个（form_for 后面的两个空格）：

= form_for @student, :url => students_path(@student), method: :post do |f|
  = f.hidden_field :student_id, :value => current_user.id
  = f.hidden_field :course_id, :value => group.id
  = submit_tag "Join this Class!", :class => "btn btn-primary pull-right join-button"