Ruby on rails 如何使rails表单响应超链接？

我正在学习MichaelHartl的Rails教程，并完成了有关创建MicroPost的部分。我想知道是否有人知道如何使micropost表单响应超链接。例如，当用户在micropost中键入

“

时，我希望链接处于活动状态。任何帮助都将不胜感激

micropost\u控制器.rb

class MicropostsController < ApplicationController
before_action :signed_in_user, only: [:create, :destroy]
before_action :correct_user, only: :destroy


def create
  @micropost = current_user.microposts.build(micropost_params)
  if @micropost.save
  flash[:success] = "Micropost created!"
  redirect_to root_url
else
  @feed_items = []
  render 'static_pages/home'
end
end

def destroy
  @micropost.destroy
  redirect_to root_url
end

private 

  def micropost_params
    params.require(:micropost).permit(:html)
end

def correct_user
  @micropost = current_user.microposts.find_by(id: params[:id])
  redirect_to root_url if @micropost.nil?
end
end

<%= form_for(@micropost) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
  <div class="field">
    <%= f.text_area :content, placeholder: "Compose new micropost..." %>
  </div>
  <%= f.submit "Post", class: "btn btn-large btn-primary" %>
<% end %>

class MicropostsController

microspost.rb

 class Micropost < ActiveRecord::Base   
   belongs_to :user  
   default_scope -> { order('created_at DESC') }   validates :content,
   presence: true, length: { maximum: 140 }   validates :user_id,
   presence: true end

 ...
 end

class Micropost{order（'created_at DESC'）}验证：content，
presence:true，长度：{maximum:140}验证：user\u id，
存在：真正的终结
...
结束

microspost_form.html.erb

class MicropostsController < ApplicationController
before_action :signed_in_user, only: [:create, :destroy]
before_action :correct_user, only: :destroy


def create
  @micropost = current_user.microposts.build(micropost_params)
  if @micropost.save
  flash[:success] = "Micropost created!"
  redirect_to root_url
else
  @feed_items = []
  render 'static_pages/home'
end
end

def destroy
  @micropost.destroy
  redirect_to root_url
end

private 

  def micropost_params
    params.require(:micropost).permit(:html)
end

def correct_user
  @micropost = current_user.microposts.find_by(id: params[:id])
  redirect_to root_url if @micropost.nil?
end
end

<%= form_for(@micropost) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
  <div class="field">
    <%= f.text_area :content, placeholder: "Compose new micropost..." %>
  </div>
  <%= f.submit "Post", class: "btn btn-large btn-primary" %>
<% end %>

您可以使用helper方法并将锚（

a

）标记作为唯一允许的标记传入。你在他们创建帖子时不使用它，而是在视图中显示micropost时使用它

app/views/microposts/show.html.erb

<%= sanitize micropost.content, tags: ['a'] %>

（我不知道你是如何展示micropost的内容的，但这应该会给你一个想法） 这比其他选项（如

html\u safe

）更安全，因为您可以实际控制允许用户输入的html标记