Rails-从js.erb文件更改数据库中的布尔值

Question

In my scenario in rails application after sharing content to facebook i will get a response object with post id

post_id: "mypostidhere"

If its not successful i will get response object with an error message.

So according to the response i want to change a boolean column of last row for the current user in my database table. And for this in my .js.erb file i tried to access current_user.model.last but it throws the following error.

undefined local variable or method `current_user' for 

So how can i change the boolean column in database according to the response?

UPDATED

Ajax code

 $.ajax({
        type: "POST",
        url: "/action"
    });

Controller code

def action
  current_user.modal.last.toggle!(:boolean-column-name)
end

It changes the table column successfully. But after that i am receiving an error in browser CONSOLE as below

POST http://URL/action
500 (Internal Server Error)

I am new to AJAX. What i am doing wrong in ajax request? Thanks in advance.

Answer 1

current_user is not a local variable to your JS function/file, it is a helper provided and available in your rails application.

So, what I will like to ask is:

How are you using current_user in the JS file?

What you can do is to make an ajax call to a controller method, and then access current_user directly from the controller.

Answer 2

If you want to change the db, you're going to have to communicate with your Rails app, which is done with ajax :

#app/assets/javascripts/application.js
... // your events will fire
$.ajax({
   url: "/users/update",
   method: "PUT",
   data: { param: "value" }
   success: function(data) {
      // do something here
   };
});

This will allow you to do the following:

#config/routes.rb
resources :users do
   put :update, on: :collection
end

#app/controllers/users_controller.rb
class UsersController < ApplicationController
   def update
      current_user.update(update_params)
   end

   private

   def update_params
       params.permit(:param)
   end
end