Story Driven Web Development

STYLE OF DEVELOPMENT
SET OF TOOLS
WE FIND USEFUL
STORY DRIVEN DEVELOPMENT

CODE
RUBY
RAILS
CUCUMBER
HAPPY HAPPY SAD

WHAT I REALLY WANT?
WHY IT WORKS FOR US!

EVOLVING METHOD
DELIVERING BETTER SOFTWARE

ELEGANCE
ENJOYABLE
CREATIVE
STANDS ON ITS FEET

ON WITH THE SHOW

EXAMPLE. FEATURE.
Feature: Article tags
In order to work with article tags
As a site user
I want to both create and delete tags

EXAMPLE. FEATURE.

Scenario: Creating a tag
Given an article exists with no tags
When I submit a new tag for the article
Then the article should have one tag
And I am redirected to the article

EXAMPLE. FEATURE.


Scenario: Deleting a tag
Given an article exists with one tag
When I delete the article tag
Then the article should have no tags

EXAMPLE. FEATURE.
As a site user



DECLARATION OF INTENTION
NATURAL LANGUAGE
IMMENSELY POWERFUL

BEST THING YOU CAN DO AS A
PROGRAMMER?
CODE LESS.

WRITE PROSE
AVOID GETTING PROGRAMMATIC
MAKE IT A ‘REAL’ STORY
ITS EXECUTABLE!

DEFINING. MODELS.
class Article < ActiveRecord::Base
has_many :taggings, :dependent => :destroy
has_many :tags, :through => :taggings

def add_tag(value)
new_tag = Tag.find_or_create_by_name(value)
unless Tagging.exists?(:article_id => self.id, :tag_id => new_tag)
taggings.create(:tag => new_tag)
end
end
end

DEFINING. MODELS.

def add_tag(value)
end
end
end

class Tagging < ActiveRecord::Base
belongs_to :tag
belongs_to :article
end

DEFINING. MODELS.

def add_tag(value)
end
end
end

class Tagging < ActiveRecord::Base
belongs_to :tag
belongs_to :article
end

class Tag < ActiveRecord::Base
has_many :taggings
end

DEFINING. ROUTES.
ActionController::Routing::Routes.draw do |map|
map.home quot;quot;, :controller => quot;pagesquot;, :action => quot;homequot;

map.resources :articles do |article|
article.resources :taggings
end
end

DEFINING. CONTROLERS.
class TaggingsController < ApplicationController
def create
article = Article.find(params[:article_id])
article.add_tag(params[:tags])
redirect_to article_path(article)
end

def destroy
article = Article.find(params[:article_id])
tagging = article.taggings.find(params[:id])
tagging.destroy
redirect_to article_path(article)
end
end

DRY IT UP. REGEX MATCHING.
Given /^an article exists with no tags$/ do
@article = Article.create!(:title => quot;Beautiful Evidencequot;)
end

Given /^an article exists with one tag$/ do
@tag = Tag.create!(:name => quot;visualisationquot;)
@tagging = @article.taggings.create!(:tag => @tag)
end

Given /ân article exists with no tags$/ do
end

Given /ân article exists with one tag$/ do
@tag = Tag.create!(:name => quot;visualisationquot;)
end
Given /ân article exists with (d+) tags$/ do |num|
num.to_i.times do |num|
@tag = Tag.create!(:name => quot;random-tag-#{num}quot;)
end
end

Then /^the article should have one tag$/ do
@article.taggings.length.should == 1
end

Then /^the article should have no tags$/ do
end

Then /^the article should have one tag$/ do
end

Then /^the article should have no tags$/ do
end

Then /^the article should have (d+) tags$/ do |num|
@article.taggings.length.should == num.to_i
end

As a site user




Given an article exists with 0 tags

Then the article should have 1 tags


Then the article should have 0 tags

WHAT ABOUT VIEWS?
RESPONSE.SHOULD
WEBRAT

VIEWS. RESPONSE.SHOULD
Feature: Viewing an article
In order to read an article
As a site user
I want access the article

Scenario: Viewing an article
When I view the article
Then I should see the page
And I should see the article title
And I should see the article tag

VIEWS. RESPONSE.SHOULD
When /Î view the article$/ do
get article_path(@article)
end

Then /Î should see the page$/ do
response.should be_success
end

Then /Î should see the article title$/ do
response.should include_text(@article.title)
end

Then /Î should see the article tag$/ do
response.should include_text(@tag.name)
end

VIEWS. WEBRAT
Scenario: Submitting the add tag form
When I visit the article page
And I submit the tag form with 'edward'
Then I am redirected to the article
And the article should have 1 tags
And the article should be tagged with 'edward'

VIEWS. WEBRAT
Scenario: Submitting the add tag form
When I visit the article page
And I submit the tag form with 'edward'
Then I am redirected to the article
And the article should have 1 tags
And the article should be tagged with 'edward'

When /^I visit the article page$/ do
visit article_path(@article)
end

When /^I submit the tag form with '(w+)'$/ do |value|
fill_in quot;tagsquot;, :with => value
click_button quot;submitquot;
end

Then /^the article should be tagged with '(w+)'$/ do |value|
@article.tags.map(&:name).include?(value).should be_true
end

NATURAL LANGUAGE SPECS
ELEGANT
CHANCE TO CODE LESS
ENJOYABLE

MICHAEL KOUKOULLIS
twitter: kouky
email : m@agencyrainford.com

Story Driven Web Development

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