Development

A Simple Twitter App with Ruby on Rails – Messages With Ajax

June 24th, 2009

Ruby on Rails is a web application framework that promotes rapid development. Clients’ demands are ever increasing yet they still expect the same quality of output.

Frameworks, like Rails, help to achieve this; why?… here are some of the reasons:


  • Convention over Configuration (CoC):

    This is used to reduce the amount of up-front configuartion. The idea is; if you abide by certain coding conventions, you will have little, to none, configuration to do.
  • Object-Relational Mapping (ORM):

    ORM reducing coupling to the database. This abstraction allows you changed the DBMS provider with little trouble.
  • Structured Code:

    The MVC pattern forces you to organise your code in a clean, structured way. This results in more maintainable code.
  • Plugins:

    Plugins save you from re-inventing the wheel every time you want to add functionality to your app. For instance, making you web app capable of performing searches can be easily added with the acts_as_ferret plugin. There are many more plugins!

Who is this Tutorial for?

This tutorial is for people who have learnt the basics of Rails and want to take things to the next level. This tutorial is not a beginners guide for getting started with Rails. If you are just starting out with Rails I suggest this article from Six Revisions.

What this Tutorial Covers

In the first part of this three part series, we cover setting up a simple message model, which will hold the messages posted. Further to this, we will learn how to post a message asynchronously, using AJAX.

View Demo of Twitter App with Ruby on Rails

Basic Application Design

Ok, so you’ve decided to create a “twitter” style micro-blog using Ruby on Rails. First, we need to think about our basic requirements and from this we can model our application.

There are many ways that this can be done, but we will use a simple technique in which you jot down a few paragraphs about how and what the application is expected to do then highlight the nouns. So, lets try it.

My web app should work in a similar way to twitter. Users should be able to register with the site and create short posts. Users should be able to follow other users. Each user should be able to see their own posts plus the users they are following.

Note that I’ve been selective in what nouns I’ve highlighted. You only really need to take notice of the nouns which you feel will need to store data to the database.

I know there is more to twitter than this, but lets leave it simple. As you can see the “nouns”, which will need to store data to the database are “posts” and “users”. So we require two models:

In the first part of the tutorial, we are going to deal with posts only.

  • Post
  • User

Creating the Project Files

Before we do anything we need to create a project for our twitter web app.

  > rails twitter -d mysql

As you can see, I will be using MySQL as the DBMS, however, feel free to use whatever database you want.

Open the database.yml file in the config folder and modify the password as required. An example is shown below.

development:
  adapter: mysql
  encoding: utf8
  database: twittest_development
  pool: 5
  username: root
  password: yourpassword
  host: localhost

Now, create the database with the “rake” command.

  > rake db:create

Implementing the basic Message Model

So let’s go right ahead and generate the “Post” model and migrate it.

  > ruby script/generate model post message:text
  > rake db:migrate

Controller

Now, let’s create a controller for the post model.

  > ruby script/generate controller posts

We need to set up some methods for interacting with the model. Edit your “posts_controller.rb” file and add the following methods:

class PostsController < ApplicationController
  def index
    @posts = Post.all(:order => "created_at DESC")
    respond_to do |format|
      format.html
    end
  end
  
  def create
    @post = Post.create(:message => params[:message])
    respond_to do |format|
      if @post.save
        format.html { redirect_to posts_path }
      else
        flash[:notice] = "Message failed to save."
        format.html { redirect_to posts_path }
      end
    end
  end
end

We only need two methods, “index” and “create”. The index method creates an instance variable containing all the posts in descending order. The create method is used to create a new post.

Views

Let’s create the “index” view. First, we’ll create a partial for posts. Create a file called “_post.html.erb” in the views/posts folder and add the code below.

<p><b>Posted <%= time_ago_in_words(post.created_at) %> ago</b></p>
<p><%= post.message %></p>

The index view is now very simple. Create a file called “index.html.erb” in the views/posts folder and add the code below.

<%= render :partial => @posts %>

Create some Posts

Open a console session and create a few new messages, as shown below.

  > ruby script/console
  Loading development environment (Rails 2.3.2)
  >> Post.create!(:message => "My first post" )
  >> Post.create!(:message => "Post number two!" )

Create a Form for Posts

Obviously you’re not going to get the user to use the console to create messages. So, our next task is to inject some functionality into our web app to allow the user to create messages. Twitter has an input box above the indexed messages, which is used for submitting a new message; We will keep our web app the same.

First, we will create a partial for the form, then we will render that partial at the top of the index view. Create a file called “_message_form.html.erb” in the posts view folder and add the following code:

<% form_tag(:controller => "posts", :action => "create") do %>
  <%= label_tag(:message, "What are you doing?") %><br />
  <%= text_area_tag(:message, nil, :size => "44x6") %><br /> 
  <%= submit_tag("Update") %>
<% end %>

Now, we need to modify the index view to render this partial at the top. Open the index.html.erb file and modify the code as follows:

< %= render :partial => "message_form" %>
< %= render :partial => @posts %>

For this to work we need to make one last modification. Open the route.rb file and map a new “posts” resource, as shown below. (Note: the comments from this file have been removed).

ActionController::Routing::Routes.draw do |map|
  map.resources :posts
  map.connect ':controller/:action/:id'
  map.connect ':controller/:action/:id.:format'
end

This creates a few named routes. If you look back to the “create” method in the posts controller, you’ll see that we make use of the posts_path named route; Defining the posts resource makes this named route available.

So, lets fire up the web server and a see how things look.

  > ruby script/server

Now open a browser and go to http://localhost:3000/posts. You should see a screen, as shown below.

Adding some AJAX

AJAX allows you to make asynchronous requests to the server using JavaScript. We will make use of AJAX to make the posting a message a bit smoother.

When the user clicks on the “Update” button, we want the message to update without refreshing the browser. We have a few things to do to add AJAX functionality. First, lets change the “create” method in the posts controller:

  def create
    @post = Post.create(:message => params[:message])
    respond_to do |format|
      if @post.save
        format.html { redirect_to posts_path }
        format.js
      else
        flash[:notice] = "Message failed to save."
        format.html { redirect_to posts_path }
      end
    end
  end

The only change here is the “format.js” code, allowing the create method to respond to JavaScript. Next, we need to create a posts layout file. In the views/layout folder create a file called “posts.html.erb” and add the following code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <%= javascript_include_tag :all %>
</head>
<body>
  <div id="content">
    <%= yield %>	
  </div>
</body>
</html>

The main purpose of this is to make use of the “javascript_include_tag” call, which includes the relevant JavaScript files for AJAX and some visual effects. Next, we need to make a small addition to the index view (“index.html.erb”).

<%= render :partial => "message_form" %>
<div id="posts">
  <%= render :partial => @posts %>
</div>

As you can see all we have added is a div block surrounding the posts partial. This will be used later when we are specifying where the AJAX response should be placed. Nearly there! Now we will add a div_for block to our post partial (“_post.html.erb”).

<% div_for post do %>
  <p><b>Posted <%= time_ago_in_words(post.created_at) %> ago</b></p>
  <p><%= post.message %></p>
<% end %>

Edit the “_message_form.html.erb” partial and change the form_tag call to form_remote_tag as show in the code extract below:

<% form_remote_tag(:controller => "posts", :action => "create") do %>

The div_for operation create a div block with a unique id, this is especially useful when looping through several records. Finally, we need to create the rjs template. To do this, create a file called “create.js.rjs” in the views/posts folder and add the following code.

page.insert_html :top, :posts, :partial => @post
page[@post].visual_effect :highlight

The first line specifies that a new post partial will be rendered at the top of the posts div when the asynchronous call responds. The second line specifies that a “highlight” visual effect will be applied to that block when it is rendered.

That’s it! Start you web server again, browse to http://localhost:3000/posts and give it a go.

Make it Look Pretty!

I’ve created a stylesheet, which we can use to make things look a bit more respectful. Create a file called layout.css in the public/stylesheets folder then add the following CSS code:

body
{
  font-family: tahoma, sans-serif;
  font-size: 18px;
  background-color: #4B7399;
  width: 100%;
  color: #ffffff;
  margin: 0;
  text-align: center;
}

#content
{
  width: 800px;
  margin: 0 auto; 
  text-align: left;
}

.post
{
  padding: 5px 20px 5px 20px;
  background-color: #ffffff;
  margin: 20px 0 20px 0;
  color: #000000;
} 

Finally, you will need to add stylesheet_link_tag call to the posts.html.erb layout file. As per below, the call should be placed in the head tag.

<head>
  <%= javascript_include_tag :all %>
  <%= stylesheet_link_tag 'layout' %>
</head>

OK! It doesn’t look that pretty, but it will do for our purposes.

Setting up a Home Page

To have the root URL (http://localhost:3000) direct the user towards your posts you will first need to delete the public/index.html file. Do this now.

The second thing you need to do is set up a route in your config\routes.rb file. Open routes.rb in notepad and add a new line to the end using map.root, as shown below.

ActionController::Routing::Routes.draw do |map|
  map.resources :posts
  map.connect ':controller/:action/:id'
  map.connect ':controller/:action/:id.:format'
  map.root :controller => "posts"
end

For more on routes, try the Rails API Documentation

Now if you browse to http://localhost:3000. The request will be routed to the posts controller.

Summary

This concludes the first part of the series. Depending on the popularity of this article, parts 2 and 3 will follow shortly.

What have we Learnt?

You’ve learnt how to carry out basic application design and how to use this design to work out what models are required. Further to this, you’ve learnt how to use the console to help with the development of your application. Finally, you used AJAX to perform asynchronous requests to the server.

Author: Phil McClure

Phil McClure is a Software Developer from Belfast, Northern Ireland. His main interests are software architecture, design patterns and how these can be applied to web development. Phil blogs at Therailworld. Follow him on Twitter.

Write for Us! We are looking for exciting and creative articles, if you want to contribute, just send us an email.

The jungle is alive: Be it a collaboration between two or more authors or an article by an author not contributing regularly. In these cases you find the Noupe Editorial Team as the ones who made it. Guest authors get their own little bio boxes below the article, so watch out for these.

Tags: ,

Sort by:   newest | oldest | most voted
montana flynn
Guest
6 years 11 months ago

jeez, I am just learning PHP, but this gives me something to aspire to.

Paul Datta
Guest
6 years 11 months ago

Great. I’d like to see where this is heading. Cant wait for the other parts to show up here.
I generally tend to write my own javascript (using jquery) and not use a lot of rjs but that’s just a preference. I am not going to comment no the ruby code just yet.
Neat

Orion Engleton
Guest
Orion Engleton
6 years 11 months ago

Thanks a lot for this.. It was a quick way to reinforce a lot of things I learned.. Thanx Keep them coming. (One thing though.. your tags keep showing up everywhere.) I quickly re wrote my views in haml though.

MonkeyProgrammer
Guest
MonkeyProgrammer
6 years 11 months ago

This is very well presented – I haven’t tried it because it will take me ages to set up ruby – but its written so clearly with nice little text boxes etc – brilliant man.

Phil McClure
Guest
6 years 11 months ago

Thanks everyone.

Just one thing to note. The demo data is here:-

http://www.therailworld.com/posts/18-Create-a-Twitter-App-with-Rails-Demo-Data

I gave noupe.com the wrong link by mistake – I’ll get Noura to update this…

Antwan
Guest
Antwan
6 years 11 months ago

I just hate Ror.

Swapnil S. Shukla
Guest
4 years 11 months ago

ROR is not for hating….it is for loving….

hxizan
Guest
hxizan
6 years 11 months ago

Wonderful tutorial, thank you very much.

Matt Foley
Guest
6 years 11 months ago

Great tutorial… Simple and easy to follow. Looking forward to parts 2 and 3! (Seeing as how this was posted to the front page of Digg, I hope it’s popular enough to warrant a follow-up)

railsfan
Guest
railsfan
6 years 11 months ago

You missed the opportunity of creating a useful tutorial. You should’ve used JQuery instead of rjs!

A
Guest
6 years 11 months ago

Please help. What should this line
format.js
be in posts_controller.rb ???

Thanks

A
Guest
6 years 11 months ago

Solved – the tags should be removed

Phil
Guest
6 years 11 months ago

Yeah, just a note about some of the code blocks. There are some unwanted “” and “” tags in these areas:

map.resources :posts

format.js

Just remove them, they shouldn’t be there. I’ll try to get Noura to remove them from the tutorial.

Phil
Guest
6 years 11 months ago

Sorry that should be bold tags i.e.

Phil
Guest
6 years 11 months ago

Not having much luck here, trying to get a html tag into a comment… Let’s try again. Bold tags, as in:-

<b>

Noupe
Guest
6 years 11 months ago

Phil, I have fixed the code in the post now.
Thanks a lot for creating such a useful tutorial. Looking forward for your next tutorial in this series :)

Aneslin
Guest
6 years 11 months ago

thanks a lot bro
very easy steps.
easy to follow.
thx

Phil
Guest
6 years 11 months ago

The Source Code!
================

The link for the source code is wrong. Here is the correct URL:-

http://www.therailworld.com/posts/18-Create-a-Twitter-App-with-Rails-Demo-Data

biyografi
Guest
6 years 11 months ago

Thanks Great tutorial. Simple and easy to follow….

a?k ?iirleri
Guest
6 years 11 months ago

thanks post.. .

sankalp karn
Guest
6 years 11 months ago

hi it was a very wonderful article.really awaiting for other one.

Phil
Guest
6 years 11 months ago

I’ve tried to post this a few times now, but it keeps getting blocked. This is the correct URL for getting the source code for this tutorial:-

“therailworld.com/posts/18-Create-a-Twitter-App-with-Rails-Demo-Data”

slice2U
Guest
6 years 11 months ago

Great and well presented… thanks for sharing!

Dany
Guest
6 years 11 months ago

thanks a lot my friend easy steps.
& easy to follow ill test for sure
thanx a lot :)

Nader Hendawi
Guest
Nader Hendawi
6 years 11 months ago

Awesome tutorial, I really hope you continue the series

Jake Rocheleau
Noupe Team
6 years 11 months ago

Man I wish I had the time to learn RoR, seems like a really great technology that may overpass PHP one day. Still a great tutorial, thanks!

Allen
Guest
6 years 11 months ago

I did a project at school where we made a twitterish website branded for our school called Ritter. If you’re interested, check it out on github (http://github.com/blatyo/Ritter/tree/master).

Andrew
Guest
6 years 11 months ago

Just what the world needs, another web based twitter client ;-). Very nice tutorial, IMHO a nice one to get your feet wet with RoR.

christine
Guest
christine
6 years 10 months ago

this tutorial is really simple and straight to the heart of rails , i will be looking forward to parts 2 and 3 , keep up the good work , many thanks christine

Ben
Guest
Ben
6 years 10 months ago

Thanks so much for posting this! I found this very helpful.

Ann Arbor Michigan Website Promotion
Guest

Great tutorial. Love the illustrations that you’ve put in.

voo
Guest
voo
6 years 10 months ago

hi!!! what version of rails you are using? becouse it throws me some errors out

for example this ->

unexpected ‘:’, expecting ‘)’
@posts = Post.find(:all :order => “created_at DESC”)

thanx

Mike
Guest
Mike
6 years 10 months ago

It should be
@posts = Post.find(:all, :order => “created_at DESC”)

you forgot your , after the :all

chrome
Guest
6 years 9 months ago

thanks.. I love this theme, thanks for sharing

Mynak
Guest
6 years 9 months ago

Excelent tutorial, thank you so much.

Gabriel Bianconi
Guest
6 years 9 months ago

Awesome tutorial!!! More tutorials about Rails, please?

yamini
Guest
yamini
6 years 9 months ago

wonderful work !!!! was very useful….thanks!!!

roamy
Guest
6 years 9 months ago

Whats with this??

NameError in PostsController#index

uninitialized constant PostsController
RAILS_ROOT: /Users/kenfoust/Projects/RubyProjects/twitter

Application Trace | Framework Trace | Full Trace
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:443:in `load_missing_constant’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:80:in `const_missing_with_dependencies’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/dependencies.rb:92:in `const_missing’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/inflector.rb:372:in `const_get’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/inflector.rb:372:in `block in constantize’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/inflector.rb:371:in `each’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/inflector.rb:371:in `constantize’
/Users/kenfoust/.gem/ruby/1.9.1/gems/activesupport-2.3.3/lib/active_support/core_ext/string/inflections.rb:162:in `constantize’
/Users/kenfoust/.gem/ruby/1.9.1/gems/actionpack-2.3.3/lib/action_controller/routing/route_set.rb:440:in `recognize’
/Users/kenfoust/.gem/ruby/1.9.1/gems/actionpack-2.3.3/lib/action_controller/routing/route_set.rb:433:in `call’

roamy
Guest
6 years 9 months ago

I fixed it forgot the “s”

Niler Barcelos
Guest
6 years 9 months ago

Great Tutorial!!!

Very easy, thanks!!!!!!!

DavidMoreen
Guest
6 years 9 months ago

Hook us up Noope, I know nothing about Ruby on Rails. Although I wish I did. Find us a tutorial on ROR but for absolute very beginners, that use a Mac! This looks nice but I have no idea how to implement it.

Alex
Guest
Alex
6 years 9 months ago

The data doesn’t seem to be saving to the database. New posts come up blank. Help?

Srikanth
Guest
6 years 9 months ago

Thanks man,
I have learnt Ajax on Rails through this app,.

Jai
Guest
6 years 9 months ago

Really interesting article..

You can also checkout another twitter app using jQuery.
http://ajaxdump.com/2009/08/21/tweetable-display-twitter-feeds-on-your-site-jquery-plugin/

jason
Guest
jason
6 years 7 months ago

I am getting this error after part 1 of this tutorial, i have double checked everything and followed everything to a tee…

undefined local variable or method `post’ for #

any ideas???

Westy
Guest
Westy
6 years 6 months ago

Great tutorial. Followed it through and it worked 1st time!

1 question. When it comes to validation through posts.rb, i add:
validates_presence_of :message
and within the view, I have

the validation works, but i dont get a message. What have i misseD?

Cheers

sujeet
Guest
sujeet
6 years 5 months ago

Its great tutorial ! :),
Can you tell me the details of the tables of you have used or where I can find them?

kodegeek
Guest
6 years 5 months ago

Thanks Phil McClure for the lovely post. As i’m new in ROR, didn’t understand the following lines, wiuld be better if you explain more

page.insert_html :top, :posts, :partial => @post
page[@post].visual_effect :highlight

Thanks

kumar
Guest
6 years 4 months ago

great tutorial!! how can we get this div to aoto refresh? suppose a situation where multiple users are using this,if one user adds a message it should automatically be displayed in the browsers of other users. thanks in advance for your help.

Gorkem
Guest
Gorkem
6 years 2 months ago

Great tutorial Phil, thank you a lot for nice explaining and also usage if sample images after code where most other tutorials lack.

Nagaraju
Guest
Nagaraju
5 years 9 months ago

Showing posts/_message_form.html.erb where line #1 raised:

You have a nil object when you didn’t expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]

Extracted source (around line #1):

1: “posts”, :action => “create”) do %>
2:
3: “44×6”) %>
4:

Trace of template inclusion: /posts/index.html.erb

Nagaraju
Guest
Nagaraju
5 years 9 months ago

Thanks Phil McClure for the lovely post. But when i open the posts page the following error will occur please let me know the problem and solution.

Showing posts/_message_form.html.erb where line #1 raised:

You have a nil object when you didn’t expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.[]

Extracted source (around line #1):

1: “posts”, :action => “create”) do %>
2:
3: “44×6?) %>
4:

Trace of template inclusion: /posts/index.html.erb

kumakumar
Guest
kumakumar
5 years 9 months ago

Now, we need to modify the index view to render this partial at the top. Open the index.html.erb file and modify the code as follows:

is this meant to be something missing or really ???

Amit Pandey
Guest
Amit Pandey
5 years 8 months ago

hey.. its a great tutorial keep it up and give some more useful tutorial

Vijay
Guest
Vijay
5 years 8 months ago

Good explanation thanku

Anirudh N V
Guest
Anirudh N V
5 years 8 months ago

Hi ,thanku for a great explanation .

gtr
Guest
5 years 8 months ago

gte

Attorney Miss Hinojosa
Guest
5 years 7 months ago

Interesting article! I certainly agree. Well stated.

tarique
Guest
tarique
5 years 5 months ago

this is an excellent article. Finally found a start to end example and explanation. Thank you very much.

perruss
Guest
perruss
5 years 5 months ago

I get this error : undefined method `form_remote_tag’
Rails 3.0.3
Ruby 1.9.2

Btw, nice article !

flotto
Guest
flotto
5 years 5 months ago

i’ve tried:

“posts”, :action => “create”, :remote => true do %>

that didn’t gives an error, but i also didn’t work :( (the site will be simply reloaded)

flotto
Guest
flotto
5 years 5 months ago

my solution:
true do %>

flotto
Guest
flotto
5 years 5 months ago

my solution:
“form_tag “/posts/create”, :remote => true do”

perruss
Guest
perruss
5 years 4 months ago

@flotto

Good job, it works !

Jagdish
Guest
Jagdish
5 years 3 months ago

Great tutorial,
cheers!

Benjamin Zalasky
Guest
5 years 3 months ago

I can’t seem to get the AJAX to work… I’m using Rails 3, so I’m aware of the fact that form_remote_tag is deprecated. Right now, I’m using the line “posts”, :action => “create”, :remote => true) do %> at the top of my _message_form.html.erb… and the app isn’t throwing any errors, but it’s also not Ajaxified. I saw the comments above that seemed to address the problem, but their code didn’t seem complete or at least didn’t make sense to me. Anyone have any thoughts?

Benjamin Zalasky
Guest
5 years 3 months ago

Well, no wonder the code didn’t look complete. The comments strip stuff out…

Vitaly
Guest
5 years 2 months ago

Hmm, how to make it works with Rails 3?
I use rails 3 routes, but I guess some more depreciated stuff is used here. What do I have to do the other way, anybody knows?

Daniel
Guest
4 years 11 months ago

Learn Rails 3 first than make it

Goto their home page, they have got really awesome tutorials

bhavesh
Guest
bhavesh
5 years 2 months ago

i m implementing in rails 3,
during AJAX implementing,in rails 3
“posts”, :action => “create”) do %>
this tag not support so i keep old one that is, with :remote => true add .
“posts”, :action => “create”, :remote => true) do %>

is it write ?

Mario
Guest
Mario
4 years 11 months ago

Thanks very much this has been VERY helpful!

Brick
Guest
Brick
5 years 1 month ago

I’ve got this section of the app working with Rails 3 (and removed any deprecated code, so I am getting no warnings in the console at runtime).

I seem to be having an issue with the ajax, however – there is no highlight when I create a new post, which presumably there should be, so I assume that the page is not ajaxified (it is too light a page to tell if it is doing a full page reload or just a section).

Any ideas anyone?

Ashu
Guest
Ashu
5 years 28 days ago

Hi,

I got routing error when i used below routing with rails versino 3.0 and ruby versino 1.9

# map.resources :posts
# map.connect ‘:controller/:action/:id’
# map.connect ‘:controller/:action/:id.:format’

I converted them to
1)resources :posts
2) unable to get the equivalent of line 2 above in rails 3.0
3) match ‘:controller(/:action(/:id(.:format)))’

Please let me know the conversion text to be use for line 2 in rails 3.0 version

Swapnil S. Shukla
Guest
4 years 11 months ago

it will be similar as u typed in the third line…try it…

Magic
Guest
Magic
4 years 11 months ago

Excellent tutorial

Swapnil S. Shukla
Guest
4 years 11 months ago

hello….don’t hate ROR…it’s a very powerful language

Tres
Guest
Tres
4 years 10 months ago

Hey guys, when I change the following line in: _message_form.html.erb

from:
<% form_tag …
to:
<% form_remote_tag …

I receive a traceback. Not sure why.

The traceback is:

NoMethodError in Posts#index

Showing C:/Users/linx/twitter/app/views/posts/_message_form.html.erb where line #1 raised:

undefined method `form_remote_tag' for #<#:0xb66e350>
Extracted source (around line #1):

1: “posts”, :action => “create”) do %>
2:
3:
4: “44×6”) %>
Trace of template inclusion: app/views/posts/index.html.erb

Rails.root: C:/Users/linx/twitter

Application Trace | Framework Trace | Full Trace
app/views/posts/_message_form.html.erb:1:in `_app_views_posts__message_form_html_erb__27854131_95637984_1132246′
app/views/posts/index.html.erb:1:in `_app_views_posts_index_html_erb___206319701_95643984_0′
app/controllers/posts_controller.rb:4:in `index’

Assistance would be appreciated =)

maus-
Guest
maus-
4 years 10 months ago

@ Tres , The code here was written for an older version of ruby and the function form_remote_tag has been depreciated. Part 2 of this tutorial is figuring out the proper way to do it.

maus-
Guest
maus-
4 years 10 months ago
Orlando
Guest
4 years 7 months ago

Thanks for the teachin!

Nayana
Guest
Nayana
4 years 7 months ago

Thank you..It is an excellent tutorial and very simple to undrstand and follow..!!!!

Mackaber
Guest
Mackaber
4 years 4 months ago

Just follow it with Rails 3.1; I had to modify something but, everything worked well at the end; except for the AJAX, however I find out it didn’t worked because it needs prototype-rails, because it was deprecated in 3.1; http://weblog.rubyonrails.org/2011/4/21/jquery-new-default you can tell RoR to use it, but I think I will use Jquery for this since is the new standard

Tendai David
Guest
Tendai David
4 years 4 months ago

Phil this was great, l personally can’t wait for the continuation of this, great job man. Rails is made easy with your explanation

ramu
Guest
ramu
4 years 3 months ago

why did u mentioned @posts%> instead of post%>( i m a newbe to ror)

Bada
Guest
Bada
4 years 2 months ago

I really do appreciate the article, but Im using Rails 3.2, so i think i need some help with the _message_form.html and the routes config, because right now i can see the old post which was created at the console, but cant see the form so i can write and update

Bada
Guest
Bada
4 years 1 month ago

Is there a way to create a view where we can have i.e posted by – username on each post

Flavio
Guest
3 years 11 months ago

What is the Rails and Ruby versions used when creating this app?
We can manage it through RVM, right?

Flavio
Guest
3 years 11 months ago

Rails version is 2.3.2, what about Ruby?

Tony
Guest
Tony
3 years 3 months ago

Just wondering if this tutorial will still work, seeing how it’s almost 4 years old?

Firdaus Yusof
Guest
Firdaus Yusof
3 years 28 days ago

I think PHP is better than ruby on rails but ruby on rails is not so bad!

Rahul
Guest
2 years 8 months ago

Which version of Rails have been used to write this tutorial? I can’t find any information about Rails version.

wpDiscuz