Mastery

Following the exercises from Designing Elixir Systems with OTP.

Some additions beyond the book material:

• extra unit tests, mostly showcasing Elixir's features, or expanding on concepts I found unfamiliar
• dialyzer and excoveralls tasks added (mix dialyzer and mix coveralls.html to invoke)
• run iex --dot-iex lib/mastery/examples/api_run.exs -S mix in the project root to play with the raw API
• finished Chapter 7 now :)
• now integratedd mastery_persistence into mastery

Testing the persistence

1. Spin up a local Postgres instance through Docker: docker run -itd -e POSTGRES_USER=ectotest -e POSTGRES_PASSWORD=ectotest -p 5432:5432 --name postgresql postgres

2. Build both mastery and mastery_persistence (cd into folder, mix deps.get, mix compile)

3. cd mastery_persistence && mix ecto.create && mix ecto.migrate

4. cd mastery and run iex: iex -S mix

5. Run this in the shell:

   > MasteryPersistence.record_response(%{
   quiz_title: "lol",
   template_name: "foo",
   to: "who dis?",
   email: "lol@email.com",
   answer: "interrupting cow",
   correct: true,
   timestamp: ~U[2019-10-31 19:59:03Z]
   })

6. Open a new terminal, run docker exec -it postgresql /bin/bash

7. In the terminal (on the PGSQL container), run psql --username=ectotest followed by \c mastery_dev

8. Results:

   mastery_dev=# select * from responses;
   id | quiz_title | template_name |    to    |     email     |   answer         | correct | inserted_at         |     updated_at      
   ---+------------+---------------+----------+---------------+------------------+---------+---------------------+---------------------
    1 | lol        | foo           | who dis? | lol@email.com | interrupting cow | t       | 2019-10-31 19:59:03 | 2019-10-31 19:59:03
   (1 row)