ruby on rails - ActiveRecord::RecordNotFound in CoursesController#show -

all courses showing on index.html.erb , trying view individual course clicking view more. should link show path understand, display individual course. result need.

however, rails throughs error on url http://ruby-on-rails-102039.nitrousapp.com:3000/courses/rails (within url rails title of course, title created each new course.

activerecord::recordnotfound in coursescontroller#show couldn't find course 'id'=rails  extracted source (around line #7):  def show @course = course.find(params[:id]) end 

course controller

 class coursescontroller < applicationcontroller  def index  @courses = course.all  end   def show  @course = course.find(params[:id]) end 

routes

devise_for :users root 'signups#new' resources :signups, only: [:new, :create]  resources :courses  prefix verb   uri pattern      controller#action root    /   signups#new    root    /                              signups#new   signups post   /signups(.:format)             signups#create  new_signup    /signups/new(.:format)         signups#new   courses    /courses(.:format)             courses#index  post   /courses(.:format)             courses#create  new_course    /courses/new(.:format)         courses#new  edit_course    /courses/:id/edit(.:format)    courses#edit  course    /courses/:id(.:format)         courses#show  patch  /courses/:id(.:format)         courses#update  put    /courses/:id(.:format)         courses#update  delete /courses/:id(.:format)         courses#destroy 

index.html.erb

<div id="course-index">   <%@courses.each_slice(4) do|course| %>      <div class ="row">     <% course.each |course|%>     <div class="col-md-3 col-sm-3">     <h3><%= course.title %></h3><br />     <h3><%= course. description %></h3><br />      <%= link_to 'view more', course_path(course), class:'btn btn-primary' %>  </div>     <%end%>    </div>   <%end%>  </div> 

model

class createcourses < activerecord::migration def change create_table :courses |t|   t.string :title   t.string :desciption   t.integer :course_id    t.timestamps null: false   end   end   end 

show.html.erb

<h1>courses#show</h1> <h1><%= @course.title %></h1> <p> <%= @course.description %></p> 

solution: 3 of these worked in show method. don't understand why @course = course.find(params[:id]). because have these columns defined in model.

@course = course.find_by(params[:title]) @course = course.find_by(params[:course_id]) @course = course.find_by(params[:description]) 

@course = course.find(params[:id]) finds course id number, you're passing in title instead of id number. if thats way want keep it

@course = course.find_by(title: params[:id])   

will want