Rails 4:Simple-form checkbox for active and inactive post

Have created a check box -Boolean function in Simple-form, wanted to know how the controller can hide the post when indicative from index. When a user creates a post he has an option to hide the post from all the post list (index.html.haml). In the form i have created active Boolean input , So if active is true post is shown in the index and if active is false the post is hidden from index.

= simple_form_for @post do |f|
        = f.input :post
        = f.input :active ,:input_html => { :checked => true }
        = f.submit

index.html.haml

- @posts.each do |post|
        %h2.post= link_to post.post, post



class PostsController < ApplicationController
        before_action :find_post, only: [:show, :edit, :update, :destroy]
        before_action :authenticate_user!,except:[:index,:show]

        def index
                @posts = Post.all.order("created_at DESC")
                @post = Post.new

        end