README - a2 zombietweets

A very simple rails application for playing around with zombies in the database.

Setup

to install all necessary libraries (gems), set up the database table and add some seed data into the table run:

bundle
rails db:migrate
rails db:seed

Playing with the console

open the rails console on the commandline:

rails console

try out the various ActiveRecord commands described in Rails: Database and Models

Really!

Try all of it, every single line of ActiveRecord Code you find!

Write notes in a file a2_zombietwitter/NOTES.md

Don't worry if you mess something up, you can always go back to the original database just with seed data by running

rails db:reset

or, on windows:

rake db:drop:_unsafe
rake db:create
rake db:migrate

on the commandline.

Questions

Copy these questions over to your a2_zombietwitter/NOTES.md file and answer them there:

new and delete

What happens if you use Tweet.new, and the immedialty use .delete, without saving first?

id's

If you use Tweet.new and save, an id is assigned. Can you set the id to a specific number (say, 666) before saving? Does that work?

What happens if you use an existing id?

Is there an upper limit for ids?

If yes: what happens if you try to set a higher id?

strings

Is there a length limit for the string status? What happens if you try to assign a longer string?

touch

if t is a Tweet, would does t.touch do?

todo

add seed

create three extra zombies in the seed file.

What Happened before

this application was generated with ruby 2.7.1 and rails 6.0.3 by running the following commands:

rails new Zombietwitter
cd Zombietwitter/
bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32
rails generate model tweet status zombie
  invoke  active_record
  create    db/migrate/20201116095942_create_tweets.rb
  create    app/models/tweet.rb
  invoke    test_unit
  create      test/models/tweet_test.rb
  create      test/fixtures/tweets.yml
rails db:create
rails db:migrate