Mod 1 ActiveRecord Starter Repo

In config/database.yml, you can change the name of the database from db/cats.sqlite3 to whatever reflects your project. For example: db/notes.sqlite3. Doesn't really matter what you call the db.

ActiveRecord Methods

These common ActiveRecord methods will help you interact with your database. Please refer to the ActiveRecord docs for what they do and how to use them. (If the docs talk about Rails, that is ok! ActiveRecord works very similar with or without Rails.)

  .create (.new, .save)
  .all
  .count
  .find
  .find_by
  .where

Notes

Remember, any model that will have a corresponding table in the database needs to inherit from ActiveRecord::Base ex:

class Cat < ActiveRecord::Base
  # customer methods defined here
end

• To view database, you can run sqlite3 db/cats.db, then can run .schema or .tables and can run any SQL commands. (Don't need to do this anymore though! ActiveRecord gives us a schema file!)

Steps to setup Ruby app with activerecord

(New for ActiveRecord 6.0)

The following steps are already done for you in this boiler plate repo.

The steps below are provided to you as a reference only.

You're not expected to memorize this (please don't).

1. In root of project, run bundle init
2. Add gems: bundle add activerecord pry sinatra, sinatra-activerecord rake sqlite3 require_all run bundle install
3. mkdir config and lib
4. mkdir lib/models
5. touch config/environment.rb config/database.yml
6. Create your model files and models (make sure to have your models inherit from ActiveRecord::Base)
7. In config/environment.rb:

  require 'bundler/setup'
  Bundler.require

  require_all 'lib'

1. In config/database.yml:

development:
  adapter: sqlite3
  database: db/cats.sqlite3

1. Touch Rakefile - require ‘config/environment.rb’ and require_relative ‘sinatra/activerecord/rake’
2. Run rake -T to make sure we have access to raketasks
3. Run rake db:create_migration NAME=create_cats_table (will create the db folder if it doesn’t already exist) and will add the migration file to db/migration
4. Write migration file, then run rake db:migrate
5. Then can see schema in file structure, can also drop into sqlite3 cats.db to see the tables and schema, but don’t really need to do that anymore. Review rollback here
6. Create seeds in db/seeds.rb and run rake db:seed
7. Now can put a pry in environment.rb to run .all and see your seeds.

Make sure your models inherit from ActiveRecord::Base