postgresql - How is my Ruby on Rails app able to access the database without the password? -

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i'm getting started ruby on rails. i'm building hello world app , i'm using postgresql. used following command create app:

rails new rails-hw -d postgresql

i created database user using createuser -s pguser , set password.

i edited development section of config/database.yml, using username , password of user created. however, seems use password in database.yml file doesn't matter , app able access data in database. why ignoring password?

because current postgres installation configured allow connections localhost.

check pg_hba.conf you'll find this:

# type  database    user        ip-address    ip-mask             method host                    127.0.0.1     255.255.255.255     trust

which says "allow connections postgres users , databases 127.0.0.1."

more specifics can found in docs: http://www.postgresql.org/docs/9.1/static/auth-pg-hba-conf.html (see example 20-1)


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