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How to implement no-code REST API with PostgreSQL

This repository contains source code for the presentation on 20th of November at Talented

To run these examples, check out either talented_session or example_session branch and follow the instructions:

First start the associated docker container

➜  postgres git:(talented_session) ✗ (cd docker && docker-compose up &)
Starting docker_database_1 ... done
Starting docker_api_1 ... done
Attaching to docker_database_1, docker_api_1
database_1  | 2018-03-22 17:42:55.863 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
database_1  | 2018-03-22 17:42:55.863 UTC [1] LOG:  listening on IPv6 address "::", port 5432
api_1       | Listening on port 3000
api_1       | Attempting to connect to the database...
database_1  | 2018-03-22 17:42:55.867 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
api_1       | Attempting to reconnect to the database in 0 seconds...
api_1       | {"details":"FATAL:  database \"ontrail\" does not exist\n","code":"","message":"Database connection error"}
database_1  | 2018-03-22 17:42:56.170 UTC [1] LOG:  database system is ready to accept connections
database_1  | 2018-03-22 17:42:56.361 UTC [25] FATAL:  database "ontrail" does not exist
database_1  | 2018-03-22 17:42:57.368 UTC [26] FATAL:  database "ontrail" does not exist
api_1       | {"details":"FATAL:  database \"ontrail\" does not exist\n","code":"","message":"Database connAttempting to reconnect to the database in 1 seconds...

Next, connect to postgres and create the database

➜  postgres git:(talented_session) ✗ psql -U postgres -h localhost
psql (10.3)
Type "help" for help.

postgres=# create database ontrail;
CREATE DATABASE
postgres=#

Check that api container can connect to the database

docker logs at console should look like this:

api_1       | Attempting to reconnect to the database in 32 seconds...
database_1  | 2018-03-22 17:58:06.133 UTC [28] FATAL:  role "ontrail_authenticator" does not exist
api_1       | {"details":"FATAL:  role \"ontrail_authenticator\" does not exist\n","code":"","message":"Database connection error"}
api_1       | Attempting to reconnect to the database in 32 seconds...

Ok, so we are missing some roles in the database.

I strongly recommend using VSCode and its pgsql-html -extension for the remaining tasks. You can use SHIFT+F5 to execute commands directly from sql-files to make things go faster.

In addition, you need to add the connection string to workspace settings in order for pgsql-extension to be able to connect to the database.

{
  "settings": {
    "pgsql.connection": "postgres://postgres@localhost:5432/ontrail"
  }
}

Next, run the sql scripts in following order:

  • database/create_database.sql
  • database/ontrail_private/users.sql
  • database/ontrail_private/auth.sql
  • database/ontrail/sport.sql
  • database/ontrail/exercise.sql
  • database/ontrail/comments.sql
  • database/ontrail/feed.sql

The demo should now be set up and you can start using the rest api. You'll find the swagger documentation at http://localhost:3000/.

Happy hacking!

P.S. If you want to test some speed typing, there are some snippets at pgsql.json that you can install to VS Code as snippets for your pleasure. :)