Rails how to make tasks

Rails
1

In my project i want to make tasks like in taskrabbit.com, that user
could
create task and another user could respond on it. And the user who
created
task could choose candidates and change status to “accomplished” my
models:

class Post < ActiveRecord::Base
belongs_to :user
belongs_to :category
has_many :responcesend
class Responce < ActiveRecord::Base
belongs_to :user
belongs_to :post
default_scope → { order(‘created_at DESC’) }end

my posts controller

class PostsController < ApplicationController

load_and_authorize_resource

def new
    @category = Category.find(params[:category_id])
    @post = @category.posts.new(category_id:params[:category_id])
end

def index
    @category = Category.find(params[:category_id])
    @posts = Post.all
end

def create
    @post =  current_user.posts.build(post_params)
    @category = Category.find(params[:category_id])


if @post.save
  flash[:success] = "   "
  redirect_to post_path @post
else
render 'new'

end
end

def update
    @post =  current_user.posts.build(post_params)
    @category = Category.find(params[:category_id])
end

def show
    @post = Post.find(params[:id])
    #@category = Category.find(params[:category_id])
    @feed_items = @post.responces.paginate(page: params[:page])
end

def feed
    Responce.where("post_id = ?", id)
end

def destroy
    @post.responces.destroy
    redirect_to post_path @post
end

private

def post_params
params.require(:post).permit(:destroy, :name, :content, :date,
:time, :category_id, :price, :adress1, :adress2)
end
end

my view

<%= link_to ‘Choose candidate’, feed_item,
method: :update,
data: { confirm: ‘Are you sure?’ } %>

and my responce controller

class ResponcesController < ApplicationController

def new
    @post = Post.find(params[:post_id])
    @responce = @post.responces.new(post_id:params[:post_id])
    @responce.user = current_user
end

def create
    @post = Post.find(params[:post_id])
    @responce = @post.responces.build(responce_params)
    @responce.user = current_user
if @responce.save
  flash[:success] = "   "
  redirect_to post_path @post
else
render 'new'

end
end

def show
end

def destroy
    @responce = Responce.find(params[:id])
    @responce.destroy
    redirect_to posts_path @post
end

private

def responce_params
    params.require(:responce).permit(:price, :comment, :post_id)
endend

Can you help me out with that, how I can make it done. Is there any gem
or
articles about it?