[Rails Level 2] REST ful routes

ROUTES BE RAKIN

Please type the rake command you use to list out all the routes on the command line.

rake routes

 

FORMS

Create the form for entering tweet status (text_area) and location (text_field) using the appropriate Rails view helpers. All you need is aform_for block, the input helpers, and a submit button.

class TweetsController < ApplicationController
 
  # GET /tweets/new
  # GET /tweets/new.json
  def new
    @tweet = Tweet.new
 
    respond_to do |format|
      format.html # new.html.erb
      format.json { render json: @tweet }
    end
  end
 
  # POST /tweets
  # POST /tweets.json
  def create
    @tweet = Tweet.new(params[:tweet])
 
    respond_to do |format|
      if @tweet.save
        format.html { redirect_to @tweet, notice: 'Tweet was successfully created.' }
        format.json { render json: @tweet, status: :created, location: @tweet }
      else
        format.html { render action: "new" }
        format.json { render json: @tweet.errors, status: :unprocessable_entity }
      end
    end
  end
 
  ...
end

Answer:

<h1>New tweet</h1>

<%= form_for @tweet do |f| %>
  <%= f.text_area :status%>
  <%= f.text_field :location %>
  <%= f.submit %>
<% end %>

 

INPUTS

Look at the following database table and create the proper input fields for the columns listed here.

ActiveRecord::Schema.define(:version => 20110814152905) do
 
  create_table "weapons" do |t|
    t.string "name"
    t.integer "ammo"
    t.boolean "is_broken"
  end
 
end

Answer:

<%= form_for(@weapon) do |f| %>
  <%= f.text_field :name %>
  <%= f.number_field :ammo %>
  <%= f.check_box :is_broken %>
  <%= f.submit %>
<% end %>

 

RADIO BUTTON

Rather than having a weapon that is broken or not, lets instead have a condition field which is either"New", "Rusty", or "Broken". Add a set of radio buttons where the user can select one of these states. Make "New" be checked by default.

<%= form_for(@weapon) do |f| %>
    <%= f.text_field :name %>
    <%= f.number_field :ammo %>
    <%= f.radio_button :condition, "New", checked: true %>New
    <%= f.radio_button :condition, "Rusty" %>Rusty
    <%= f.radio_button :condition, "Broken" %>Broken
    <%= f.submit%>
<% end %>

 

SELECT BOX

Instead of using radio buttons, use a select box for the condition. Refactor the code below:

<%= form_for(@weapon) do |f| %>
  <%= f.select :condition, ["Rusty", "Broken", "New"] %>
<% end %>

 

NESTED ROUTE

Write the nested route that will allow us to nest tweets and weapons under the zombie resource. The idea here is that a zombie has many tweets and zombie has many weapons.

RailsForZombies::Application.routes.draw do
  resources :zombies do
    resources :tweets
    resources :weapons
  end
end

 

ESTED PARAMS

Now that we have the proper route, we need to make sure the weapons controller properly looks up both the zombie and the weapon when we request /zombies/2/weapons/1. Finish this controller:

class Zombie < ActiveRecord::Base
  has_many :weapons
end

class Weapon < ActiveRecord::Base
  belongs_to :zombie
end

Answer:

class WeaponsController < ApplicationController
  def show 
    @zombie = Zombie.find(params[:zombie_id])
    @weapon = @zombie.weapons.find(params[:id])
  end
end

 

LINK TO

Now create the proper link_to for when we view a zombie and want to show each of its weapons, and when we want to create a new weapon for this zombie.

class WeaponsController < ApplicationController
 
  def index
    @zombie = Zombie.find(params[:zombie_id])
    @weapons = @zombie.weapons
 
    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @weapons }
    end
  end
 
end

Answer:

<h2><%= @zombie.name %>'s weapons</h2>
<ul>
  <% @weapons.each do |w| %>
    <li><%= link_to w.name, [@zombie, w] %></li>
  <% end %>
</ul>

<%= link_to "New Weapon", new_zombie_weapon_path(@zombie) %>

 

NESTED FORM

Change the form_for below to use the proper nesting for creating a new weapon for a Zombie.

<%= form_for([@zombie, @weapon]) do |f| %>
  <%= f.text_field :name %>
  
  <%= f.submit %>
<% end %>

 

USEFUL VIEW HELPERS

Modify the following code to make it more pretty, using titleize, to_sentence, pluralize, andnumber_to_currency (in just that order).

<h2><%= @zombie.name.titleize %></h2>
<p>Weapons: <%= @zombie.weapon_list.to_sentence %></p>
<p><%= pluralize(@zombie.tweets.size, "Tweets") %></p>
<p>Money in Pocket <%= number_to_currency(@zombie.money) %></p>

 

FORM PARTIAL

Refactor the code below to move the form into the _form.html.erb partial.

<h2>New Tweet</h2>

<%= form_for(@tweet) do |f| %> 
  <div class="field">
    <%= f.label :status %><br />
    <%= f.text_area :status %>
  </div>

  <div class="field">
    <%= f.label :location %><br />
    <%= f.text_field :location %>
  </div>

  <%= f.submit %>
<% end %>

<%= link_to 'back', tweets_path %>

Answer:

new.html.erb:

<h2>New Tweet</h2>
<%= render 'form' %>
<%= link_to 'back', tweets_path %>

_form.html.erb:

<%= form_for(@tweet) do |f| %> 
  <div class="field">
    <%= f.label :status %><br />
    <%= f.text_area :status %>
  </div>

  <div class="field">
    <%= f.label :location %><br />
    <%= f.text_field :location %>
  </div>

  <%= f.submit %>
<% end %>

 

PARTIAL COLLECTION

Refactor the code below to use the _weapon.html.erb partial to render the list of weapons.

<h1><%= @zombie.name %>'s Weapons</h1>
<% @weapons.each do |weapon| %> 
  <%= div_for weapon do %>
    <h2><%= weapon.name %></h2> 
    <p>
      Condition: <%= weapon.condition %>
      Ammo: <%= weapon.ammo %>
      Purchased <%= time_ago_in_words weapon.purchased_on %> ago
    </p> 
  <% end %>
<% end %>

Answer:

weapons/index.html.erb:

<h1><%= @zombie.name %>'s Weapons</h1>
<%= render @weapons %>

weapons/_weapons.html.erb:

<% @weapons.each do |weapon| %> 
  <%= div_for weapon do %>
    <h2><%= weapon.name %></h2> 
    <p>
      Condition: <%= weapon.condition %>
      Ammo: <%= weapon.ammo %>
      Purchased <%= time_ago_in_words weapon.purchased_on %> ago
    </p> 
  <% end %>
<% end %>