A very simple rails application for playing around with zombies in the database.
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
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.
Copy these questions over to your a2_zombietwitter/NOTES.md file and answer them there:
What happens if you use Tweet.new, and the immedialty use .delete, without saving first?
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?
Is there a length limit for the string status? What happens if you try to assign a longer string?
if t is a Tweet, would does t.touch do?
create three extra zombies in the seed file.
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