Session dump:

<%= debug session %>

Params dump in a controller:

render :text => params.inspect

Single-line comments in a Rails view:

<%# code %>

Multi-line comments in a Rails view (be sure <% =begin %> and <% =end %> are not indented):

<%
=begin %>
<div class="sign-in-container">

    <h2>Sign In</h2>

    <%= form_tag sessions_path do %>

      ....some stuff

  <% end %>

</div>
<%
=end %>

Multi-line comments in Ruby (be sure =begin and =end are not indented):

=begin
    def edit
        @user = User.find params[:id]
    end
=end

Rails RESTful routes are a wonderful thing. However, if you’re building a resource that is the same singular as it is plural, such as News, you may run into a snag. Let’s first take a look at a normal resource, Users, so we have something to compare to. If we run rake routes on Users we get:

1
2
3
4
5
6
7
8

users_index GET    /users/index(.:format)    users#index
      users GET    /users(.:format)          users#index
            POST   /users(.:format)          users#create
   new_user GET    /users/new(.:format)      users#new
  edit_user GET    /users/:id/edit(.:format) users#edit
       user GET    /users/:id(.:format)      users#show
            PUT    /users/:id(.:format)      users#update
            DELETE /users/:id(.:format)      users#destroy

Notice that on line 2 users takes us to users#index while on line 6 user takes us to users#show. So if you think about it, how would this work with News? It wouldn’t.

If you’ve ever gotten an error while going a ‘gem install mysql2’ like so:

dlopen(/Users/rarneson/.rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.18.dylib
Referenced from: /Users/rarneson/.rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle
Reason: image not found - /Users/rarneson/.rvm/gems/ruby-1.9.3-p125/gems/mysql2-0.3.11/lib/mysql2/mysql2.bundle

You’ll need to create a symlink for libmysqlclient.18.dylib:

$ sudo ln -s /usr/local/mysql/lib/libmysqlclient.18.dylib /usr/lib/libmysqlclient.18.dylib

This is sort of a transcription of the net tuts + tutorial titled The Intro to Rails Screencast I Wish I Had by the always charming Jeffrey Way. This isn’t intended to explain what everything does, but the gems and commands you need to run to get up and running with TDD in Rails are discussed after the jump.

Creating a post with Octopress uses a rake command like so rake new_post["My new post"]

However, when you run this within the zsh shell it doesn’t work:

$ rake new_post["My new post"]
zsh: no matches found: new_post[My new post]

If you care about why this is, visit this Github issue. If you don’t really care and you just want a work around, use rake new_post\["My new post"\]

From the discussion in the Github issue above it sounds like imathis is planning to update the new_post command in Octopress to something like this:

rake new_post
Enter a post title:

Also worth mentioning, rake set_root_dir[your/path] doesn’t work for the same reason. So you’ll need to do rake set_root_dir\[your/path\].