如何使用PostgreSQL解决Rails中的错误’fe_sendauth：没有提供密码’？

How to resolve the error 'fe_sendauth: no password supplied' in Rails using PostgreSQL?

我试图用postgresql数据库创建我的Rails应用程序，但是当我启动rails server时，我收到此错误：

fe_sendauth: no password supplied

这是我一步一步的行动：

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$ sudo apt-GET install postgresql postgresql-contrib
$ gem install pg
$ rails NEW timetracker --database=postgresql --skip-unit-test

我的database.yml文件如下所示：

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DEFAULT: &DEFAULT
adapter: postgresql
encoding: unicode
pool: 5
host: localhost
username: postgres
password:

development:
<<: *DEFAULT
DATABASE: timetracker_development

test:
<<: *DEFAULT
DATABASE: timetracker_test

production:
<<: *DEFAULT
DATABASE: timetracker_production

这是我的pg_hba.conf文件：

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# DATABASE administrative login BY Unix DOMAIN socket
LOCAL ALL postgres peer

# TYPE DATABASE USER ADDRESS METHOD

#"local" IS FOR Unix DOMAIN socket connections ONLY
LOCAL ALL ALL peer
# IPv4 LOCAL connections:
host ALL ALL 127.0.0.1/32 md5
# IPv6 LOCAL connections:
host ALL ALL ::1/128 md5

# modified BY me.
host ALL ALL 127.0.0.1/32 trust

host ALL ALL 127.0.0.1/32 trust

host ALL ALL ::1/128 trust

所以，当我做rails server时我得到错误然后这就是我得到的结果：

1 2	$ rails c $ ActiveRecord::Base.connection.instance_variable_get(:@config)

2.1.5 :001 > ActiveRecord::Base.connection.instance_variable_get(:@config)
PG::ConnectionBad: fe_sendauth: no password supplied

from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in initialize' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:innew' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:655:in connect' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:242:ininitialize' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/postgresql_adapter.rb:44:in
new' from
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postgresql_connection' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:438:in
new_connection' from
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mon_synchronize' from
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connection' from
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start' from
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console' from
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run_command!' from
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' from
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/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in load_dependency' from
/home/denis/.rvm/gems/ruby-2.1.5/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:inrequire' from /home/denis/WEB/Rails/timetracker/bin/rails:8:in ' from
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我第一次使用postgresql，我想我只是做错了。

你能帮帮我吗？