CODEWITHSUNDEEP
ruby-on-rails
user1881983
user1881983

Reputation: 115

Requesting a ruby-on-rails application gives Psych::BadAlias error

I ran the rails server from my application directory. But when I tried to do a request from the browser with

http://localhost:3000

I get the following error:

*Psych::BadAlias

Cannot load Rails.application.database_configuration: Unknown alias: default*

Upvotes: 2

Views: 6537

Answers (6)

gerrard00
gerrard00

Reputation: 1738

The pysch gem has a breaking change where it will not allow loading YAML files containing aliases by default.

Here's an example of a YAML:

default: &default
  adapter: postgresql

Since you don't control the code in question you can either modify your yml files (e.g. database.yml) to not use aliases or monkey patch the psych code.

There is a lot more detail in this answer, even though the error message has been updated.

visit_Psych_Nodes_Alias: Unknown alias: default (Psych::BadAlias)

Upvotes: 0

daniel0318
daniel0318

Reputation: 484

This happens because the password DB has some special character if you used rbenv-vars Plugin, change the password without special character.

Upvotes: 0

Brian Maltzan
Brian Maltzan

Reputation: 1327

You might need to upgrade your ruby > 1.9.

Upvotes: 0

Roman Usherenko
Roman Usherenko

Reputation: 5639

This happens because the ruby-plugin for netbeans messes the database.yml file when creating project from existing source. It replaces the comment about sqlite3 to mysql, but even worse it erases the first definition block which is 'default'

So simply insert 

default: &default
adapter: sqlite3
pool: 5
timeout: 5000

at the beginning of the database.yml and you'll be fine

Upvotes: 3

user1881983
user1881983

Reputation: 115

The content of the database.yml file is:

development:
  <<: *default
  database: db/development.sqlite3
test:
  <<: *default
  database: db/development.sqlite3_test

production:
  <<: *default
  database: db/development.sqlite3_production

I am using netbeans as text editor and there is a error at the top of the file indicating:

ComposerException null we had this found undefined alias default

Thank you

Upvotes: 0

pdobb
pdobb

Reputation: 18037

This is being caused by an invalid alias in your database.yml file. You most likely have something that looks close to this... but not quite:

defaults: &defaults
  adapter:  mysql2
  username: root
  password: 
  host:     localhost
  timeout:  5000

development:
  database: app_name_development
  <<: *defaults

In this, &defaults defines the alias that your error is talking about. Make your database.yml look more like this syntax and you should be set. Or, post your database.yml file here and we can help you fix it specifically if needed.

Upvotes: 2

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