从rails中的按钮调用控制器方法(Calling a controller method from a button in rails)

 我之前已经多次询问过这个问题（比如这里 ， 这里 ，仅举几例）但我无法理解我的情况。 我正在使用rails 5。 
 
 我在posts_controller有一个名为scrape的方法。 它创建了几个对象实例。 
 
class PostsController < ApplicationController
  before_action :set_post, only: [:show, :edit, :update, :destroy]

  def scrape
    destroy_old_data
    @some_var = Scrape.create("something")
  end
  ...
end
 
 我想在views/posts/index.html.erb为scrape方法创建一个按钮，但是我无法使按钮起作用。 我习惯使用脚手架方法，我不知道如何创建自定义方法。 
 
 我试过的一些方法： 
 
<%= button_to "scrape", action: "scrape"%>

<%= "scrape me", { :controller => "posts", :action => "scrape"}, class: 'btn btn-primary' %>

<%= button_to "scrape", posts_scrape_path %>
 
 如何在index.html.erb中创建一个触发scrape方法的scrape按钮？ 我是否还需要修改我的路线？ 

I see this question has been ask several times before (i.e. here, here, just to name a few) but I can't get it working with my case. I am using rails 5.
 
I have in my posts_controller a method called scrape. It creates several object instances. 
 
class PostsController < ApplicationController
  before_action :set_post, only: [:show, :edit, :update, :destroy]

  def scrape
    destroy_old_data
    @some_var = Scrape.create("something")
  end
  ...
end
 
I want to create a button in views/posts/index.html.erb for scrape method, but I can't get the button to work. I am so used to use scaffold method that I don't know how to create a custom method.
 
Some of the methods that I tried:
 
<%= button_to "scrape", action: "scrape"%>

<%= "scrape me", { :controller => "posts", :action => "scrape"}, class: 'btn btn-primary' %>

<%= button_to "scrape", posts_scrape_path %>
 
How can I create a scrape button in index.html.erb that triggers scrape method? Do I need to modify my routes as well?

原文：https://stackoverflow.com/questions/41383168