验证失败后缺少嵌套资源表单值

Question

我有一个嵌套资源的表单的简单场景，该表单可以正常工作，而不是在验证失败时表单呈现为空字段。我希望使用用户输入的值重新填充字段。

控制器

  def new
    @department = Department.find(params["department_id"])
  end
  def create
    @department = Department.find(params["department_id"])
    @discussion = @department.discussions.new(discussion_params)
    @discussion.user_id = current_user.id
    if @discussion.save
      redirect_to department_discussions_path(@department)
    else
      render 'new'
    end
  end
  private
    def discussion_params
      params.require(:discussion).permit(:title, :content)
    end

形式

<%= form_for([@department, @department.discussions.build]) do |f| %>
  <p>
    <%= f.label :title %><br>
    <%= f.text_field :title, class: "form-control" %>
  </p>
  <p>
    <%= f.label :content %><br>
    <%= f.text_area :content, class: "form-control", rows: 5 %>
  </p>
  <p>
    <%= f.submit %>
  </p>
<% end %>

型

class Discussion < ApplicationRecord
  belongs_to :user
  belongs_to :department
  validates :title, presence: true,
                    length: { minimum: 5, maximum: 25 }
end

路线

  resources  :departments do
    resources :discussions  
  end 

Answer 1

如果您的控制器是Discussion控制器，请尝试添加以permit部门的参数。

也许您可以在控制台上看到一些消息，例如Unpermitted parameters: var1 , var2

基本上是这样的：

def discussion_params
    params.require(:discussion).permit(:title, :content , departments_attributes: [ :var1, :var2 ])
end