Where is my Rails database? - ruby-on-rails

Question

I paid someone to create a program with Ruby on Rails where it scrapes data and puts it in a Postgres database. In the program's directory are the standard Rails folders, application, "bin", "config" and other directories.
I'm trying to see a list of the columns in a table. I think the best, or only way, to do this is to log into the actual database, and print it out. I'm trying to use a "psql" command to log in but it is saying:
psql: FATAL: database "dan" does not exist
I'm not sure where the database is, or how I can find it.
This is what the config/database.yml contains:
development:
adapter: postgresql
database: danwork
pool: 5
timeout: 5000
encoding: unicode
username: dan
password: supersecretpassword
test:
adapter: sqlite3
database: db/test.sqlite3
pool: 5
timeout: 5000
production:
adapter: postgresql
database: sports
pool: 5
timeout: 5000
encoding: unicode
username: namename
password: sports_db
Where is my database?
How could I find the database on my own using some linux commands, like find . -iname '...'?
How do I log in, and print out all the columns for the table named "games"?

Answer 1

You want rails dbconsole or rails db.
From the Rails Guide:
rails dbconsole figures out which database you’re using and drops you into whichever command line interface you would use with it (and figures out the command line parameters to give to it, too!). It supports MySQL, PostgreSQL, SQLite and SQLite3.
You can also use the alias “db” to invoke the dbconsole: rails db.
To see the contents of your games table:
~/Documents/workspace/<project-dir>$ rails db
psql (9.6.3)
Type "help" for help.
development=# select * from games;
id | date | description | city | state
----+------+-------------+----------------------+-------
1 | | | Boston | MA
2 | | | Seattle | WA
(2 rows)
development=# \q
~/Documents/workspace/<project-dir>$
If you really want to use psql -U <username> <dbname>, you can find these parameters as described in this answer and paraphrased here:
~/Documents/workspace/<project-dir>$ rails c
Loading development environment (Rails 4.1.4)
2.3.1 :001 > Rails.configuration.database_configuration[Rails.env]
=> {"adapter"=>"postgresql", "encoding"=>"unicode", "pool"=>5, "database"=>"development"}
2.3.1 :002 > exit
~/Documents/workspace/<project-dir>$ psql development
psql (9.6.3)
Type "help" for help.
development=# \q
~/Documents/workspace/<project-dir>$
As you can see, if no username is returned, you won't need the -U flag.

Answer 2

Your database is running on a server independent of Rails (it will be set up by your coder). It looks like your database is on your localhost.
It will be dependent on your server OS.
If you're looking to show column names in your database, you'll be able to do this in the Rails Console:
$ rails c
$ Game.column_names

Answer 3

To access your database using plain PostgreSQL
su username
psql
\db database_name;

Answer 4

To connect with psql, you must specify the database name.
If you're using password auth, simply psql -U username dbname.
If you're using peer auth, sudo -u username psql dbname.
In your case you seem to be using password auth and connecting to the local host, so I suggest:
psql -U dan danwork
and entering the password when prompted. (You can use a ~/.pgpass file to save the password if desired; see the pgpass documentation)