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Overview

Agenda

  • First half: Theory, little bit of work
  • Second: Building and coding. (hands-on)

Ruby Overview

Web Technologies

  • MVC (Model, View, Controller) Applications

    • seperate your data from your views
    • Model --> the layout of your date
    • View --> how do i want to view that data
    • Controller --> brings MODEL and

  • CRUD (Create, Read, Update, Delete) based interfaces

  • RESTful interfaces --> Way to interact

  • Maps Crud to HTTP Verbs

    • Get -> Read
    • Put -> Create
    • Post -> Update
    • Delete -> Delete

Ruby vs Rails

Ruby is not Rails and Rails is kinda Ruby.

  • Ruby --> Object oriented interrupted language
  • Rails - What is it?
    • A framework/tool set for web applications (really not a site, per se)
    • A web applciations that you put something in and get something back
  • Why would ruby want to e on Rails
    • inject my stuff into object without implementing into
    • BIG SPOTLIGHT THAT MAKE IT LOOK GOOD

Tools

  • GEMS --> Packages to entend your language
  • Bundler --> A package manager which is s GEM for managing GEMS
  • Rake --> An open framework Administrative tool.
  • Collections --> A way to filter out your data

First Application

Set RBENV: export RBENV_VERSION=2.1.1

gem install rails
gem install rails
rails new llroster

output:

rails server

hit following to validate it worked: http://localhost:3000/

What did it create?

Lots of Directories

  • app
    • assets - resources that other parts of the code
    • controllers - Connects data and views
    • helpers - business rules to validate data
    • mailers - allows reports, data to be set via email
    • models - Models of data
    • views - View of data
  • bin - executable binaries
  • lib - reusable code
  • vendor - 3rd party stuff

Ensure DB is created

If doesn't create db/development.sqlite3 then do the following

rake db:create

Output if already there: db/development.sqlite3 already exists

Making the front page

rails generate controller welcome index

output validate

copy over all static version

Making some DB stuff

rails generate scaffold Players last:string first:string postion:string phone:string email:string

output Note:

  • It create you OMF - object mapping file
  • Rails auto create a place for timestamp and ID (timesta)

Create DB Tables

rake db:migrate

output

Create Players Table

rails generate scaffold Players last:string first:string postion:string phone:string email:string

output

Create Teams Table & add keys

rails generate scaffold Team name:string

output

rails generate migration add_team_fk_to_players

output

rake db:migrate

output

Commands line fun

  • getting into the Rails Console
cd ~/repos/learningRubySeries/session03/llroster
rails console
Loading development environment (Rails 4.2.1)
  • Query for Teams and Players
irb(main):001:0> Player.all
    Player Load (1.3ms)  SELECT "players".* FROM "players"
  => #<ActiveRecord::Relation [#<Player id: 1, last: "dimaggio", first: "Joe", postion: "2B", phone: "123-456-7890", email: "joe.dimaggio@gmail.com", created_at: "2015-05-09 20:45:38", updated_at: "2015-05-09 20:46:22">, #<Player id: 2, last: "Scelza", first: "Jeffrey", postion: "P", phone: "3038805658", email: "jeffscelza76@gmail.com", created_at: "2015-05-09 21:25:36", updated_at: "2015-05-09 21:30:13">]>
irb(main):002:0> Team.all
    Team Load (0.1ms)  SELECT "teams".* FROM "teams"
  => #<ActiveRecord::Relation []>
  • Create a new Team
irb(main):006:0* T=Team.new
  => #<Team id: nil, name: nil, created_at: nil, updated_at: nil>
irb(main):008:0> T.name="Lochbuie Lions"
  => "Lochbuie Lions"
irb(main):014:0> T.updated_at = Time.now
  => 2015-05-09 16:08:33 -0600
irb(main):015:0> T.created_at = Time.now
  => 2015-05-09 16:08:36 -0600
irb(main):016:0> T.save
   (0.1ms)  begin transaction
  SQL (0.8ms)  INSERT INTO "teams" ("name", "created_at", "updated_at") VALUES (?, ?, ?)  [["name", "Lochbuie Lions"], ["created_at", "2015-05-09 22:08:36.725328"], ["updated_at", "2015-05-09 22:08:33.757358"]]
   (3.2ms)  commit transaction
  • Next steps
irb(main):017:0> Team.all
    Team Load (0.2ms)  SELECT "teams".* FROM "teams"
  => #<ActiveRecord::Relation [#<Team id: 1, name: "Lochbuie Lions", created_at: "2015-05-09 22:08:36", updated_at: "2015-05-09 22:08:33">]>
irb(main):020:0* Player.all
    Player Load (0.1ms)  SELECT "players".* FROM "players"
  => #<ActiveRecord::Relation [#<Player id: 1, last: "dimaggio", first: "Joe", postion: "2B", phone: "123-456-7890", email: "joe.dimaggio@gmail.com", created_at: "2015-05-09 20:45:38", updated_at: "2015-05-09 20:46:22">, #<Player id: 2, last: "Scelza", first: "Jeffrey", postion: "P", phone: "3038805658", email: "jeffscelza76@gmail.com", created_at: "2015-05-09 21:25:36", updated_at: "2015-05-09 21:30:13">]>

rail dbconsole rails generate migration createTeams2 rails generate migration createPlayers2