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Learn more

More detailed introduction to OOP in Ruby

Home work

Required

• Classes

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Add yourself

• On the spreadsheet, there is a "Contacts" sheet, please put your bitbucket user under your name.
• Send me email so I add you to the repository

Excercise

• Clone [email protected]:bardelas/all.git
• Add a file "yourname.txt" with something inside
• Update the server

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Learn !

Its very important to know Validations and Field types as we will use them alot in our code. Please take the time to read (or at least skim over) the validations list to see what kind of validations are possible.

• Validations in Rails
• Migrations

Create a new model

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Some ruby comments

Spaces

You can't have space betwen function and open bracket

This is wrong: hello (params) (Notice the space !)
This is right: hello(params)
This is right: hello( params )

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# Validate AGE is above 16
# Validate First Name is longer than 5 characters
# Validate Username is unique

class User < ActiveRecord::Base
  attr_accessible(:age, :first_name, :last_name, :username)

  validates :age, numericality: { greater_than: 16 }
  validates :first_name, length: { minimum: 5 }

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class Cat < ActiveRecord::Base
  attr_accessible :birthdate, :breed, :name

  BREEDS = [:arabean, :asian, :bengal, :persian]

  # Name must be present and between 5 and 20 characters
  validates :name, length: { in: 5..20 }

  # Breed must be one of the following: :arabean, :asian, :bengal, :persian 
  validates :breed, inclusion: { in: BREEDS }

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<h1>User list</h1>

<table>
  <tr>
    <th>Id</th>
    <th>Username</th>
  </tr>
  
- For each user
    <tr>

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<h1>[username] details:</h1>

<table>
  <tr>
    <th>Username</th>
    <td>[username]</td>
  </tr>
  <tr>
    <th>First name</th>
    <td>[first name]</td>

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Create a new rails project "catz"

Git

In the beginning and after each successful step you make

Create model "User"

• email: string

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<ul class="media-grid">
  <% @cats.each do |cat| %>
    <li class='thumbnail'>
      <%= link_to cat_path(cat) do %>
        <%= image_tag cat.image.url, alt: cat.name %>
      <% end %>
      <ul class="controls">
        <% if can_like?(cat) %><li><%= link_to 'Like', like_cat_path(cat), method: :post, :class => 'btn btn-mini' %></li><% end %>
        <% if can_unlike?(cat) %><li><%= link_to 'UnLike', unlike_cat_path(cat), method: :post, :class => 'btn btn-mini' %></li><% end %>
        <% if can_edit?(cat) %><li><%= link_to 'Edit', edit_cat_path(cat), :class => 'btn btn-mini' %></li><% end %>