Implement the product and transaction using active_record and postgresql.
The following is just an TL;DR of the links. Please follow the links for more knowledge. (∩｀-´)⊃━☆ﾟ.*･｡ﾟ
Yaml and database.yml
Yaml is like JSON, just a sintax to express data.
database.yml contains the configuration for the database used in the project.
Bundler is a gem (libraries on ruby) manager. The gems, their versions and the profiles for the project are described on the Gemfile
Run a $ bundle install (:
setup.rb is an auxiliar file to setup the gems with bundler, ActiveRecord connection to the database and require model files.
It's a ruby gem that make easier the interaction of ruby with the database.
It provides the ways to connect the database, create queries using objects attributes and perform tasks in the database to mantain database's structruture.
You can find example of how to connect to the database on setup.rb:12
Rake is a ruby task runner. The tasks as based on a Rakefile and can be used with $ rake command.
The tasks for this project are for managing the database and it's migrations. Is good to take a look to understand how this happen on background.
Because we are not using rails and its rake tasks, we have to create the rake taks ourselves (see Rakefile) and we can use it with rake g:migrations my_migration
Represents the current structure of the database.
Contains the schema.rb with the current database structure and the folder with all migrations - db/migrate/
Here live the models that you will have to implement. Because we are using active records to they should subclass ActiveRecord::Base
On spec/ lives our tests and where you will find the especifications you will have to implement.
The tests are run using RSpec - $ bundle exec rspec spec/.
See spec/spec_helper.rb for info on how the environment is setup for tests.
Install bundler and use it to install Gems from Gemfile
$ gem install bundler
$ bundle install
Prepare database
$ rake db:create
$ rake db:migrate
$ rake db:migrate_test
See the tests failing
$ bundle exec rspec spec/
Create first migration
$ rake g:migration product
Now is your turn ;)