database.yml:

# SQLite version 3.x
#   gem install sqlite3
#
#   Ensure the SQLite 3 gem is defined in your Gemfile
#   gem 'sqlite3'
development:
  adapter: postgresql
  encoding: utf8
  database: sampleapp_dev  #can be anything unique
  #host: localhost
  #username: 7stud
  #password: 

  #adapter: sqlite3
  #database: db/development.sqlite3
  pool: 5
  timeout: 5000

# Warning: The database defined as "test" will be erased and
# re-generated from your development database when you run "rake".
# Do not set this db to the same as development or production.
test:
  adapter: postgresql
  encoding: utf8
  database: sampleapp_test  #can be anything unique
  #host: localhost
  #username: 7stud
  #password: 
  #adapter: sqlite3
  #database: db/test.sqlite3
  pool: 5
  timeout: 5000

production:
  adapter: postgresql
  database: sampleapp_prod   #can be anything unique
  #host: localhost
  #username: 7stud
  #password: 
  #adapter: sqlite3
  #database: db/production.sqlite3
  pool: 5
  timeout: 5000

pg_hba.conf:

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             127.0.0.1/32            trust
# IPv6 local connections:
host    all             all             ::1/128                 trust
# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                md5
#host    replication     postgres        127.0.0.1/32            md5
#host    replication     postgres        ::1/128                 md5

Ich habe die METHODE in den ersten drei Zeilen von md5 auf trust geändert, aber ich bekomme immer noch den Fehler.

Und egal welche Kombinationen von Dingen ich in database.yml versuche, wenn ich das tue:

~/rails_projects/sample_app4_0$ bundle exec rake db:create:all

Ich bekomme immer den Fehler:

fe_sendauth: kein Passwort angegeben

Ich habe dieses Tutorial befolgt, um die Einstellungen vorzunehmen:

https://pragtob.wordpress.com/2012/09/12/setting-up-postgresql-for-ruby-on-rails-on-linux

Mac OSX 10.6.8
PostgreSQL 9.2.4 installed via enterpriseDB installer
Install dir: /Library/PostgreSQL/9.2