CODEWITHSUNDEEP
ruby-on-railsredis
orderof1
orderof1

Reputation: 12721

ArgumentError: odd number of arguments for Hash when trying to connect to redis

I'm trying to get rails connect to redis by following this tutorial. But I'm getting the following error when I try $redis = Redis.new(:host => 'localhost', :port => 6379) or even just Redis.new. I've tried the new notation as well (host: 'localhost',port: 6379). Redis works (ping-PONG test via redis-cli passes).

ArgumentError: odd number of arguments for Hash
    from /var/lib/gems/1.9.1/gems/redis-2.1.1/lib/redis.rb:65:in `[]'
    from /var/lib/gems/1.9.1/gems/redis-2.1.1/lib/redis.rb:65:in `info'
    from /var/lib/gems/1.9.1/gems/redis-2.1.1/lib/redis.rb:606:in `inspect'
    from /var/lib/gems/1.9.1/gems/railties-4.0.0/lib/rails/commands/console.rb:90:in `start'
    from /var/lib/gems/1.9.1/gems/railties-4.0.0/lib/rails/commands/console.rb:9:in `start'
    from /var/lib/gems/1.9.1/gems/railties-4.0.0/lib/rails/commands.rb:64:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'

What am I doing wrong?

Config Details:
$ ruby -v
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]
$ rails -v
Rails 4.0.0

Upvotes: 2

Views: 3407

Answers (5)

aaron
aaron

Reputation: 1244

I've ran into the same error. The first thing I notices is that this error is related to the visual output that gets displayed in the console as a representation of the object. The inspect method is what gets called for this purpose. See the following from the stack trace:

/var/lib/gems/1.9.1/gems/redis-2.1.1/lib/redis.rb:606:in 'inspect'

So if you do redis = Redis.new(:host => 'localhost', :port => 6379) or anytime you type just redis therafter, you'll get this error. However if you ignore it and just do redis.get 'foo' everything works just fine.

Upvotes: 0

yoshdog
yoshdog

Reputation: 133

Had the following issue but we couldn't upgrade the redis gem to 3.x. It turned out that redis-rb was looking for a key/value pair for the redis config which didn't exist when running redis-server.

Running redis-server with the config file

redis-server /usr/local/etc/redis.conf

fixed the issue.

Upvotes: 2

Jasdeep Singh
Jasdeep Singh

Reputation: 3326

I had the very same issue, turns out homebrew had updated my redis-server from 2.6.x to 2.8.6

I reverted back to an older version of redis and it worked!

Upvotes: 0

Sarup Banskota
Sarup Banskota

Reputation: 91

I haven't used redis yet, but based on a cursory look, seems like you're using the redis-ruby library. You probably want to experiment with redis-rails when it's available!(http://rubygems.org/gems/redis-rails)

The easiest way out is, look for Gemfile, and remove information about the redis gem. Replace that line with:

gem 'redis-rails'

Save the file, then run:

$ bundle install

Upvotes: 1

Zac Hallett
Zac Hallett

Reputation: 494

I receive the same error using the redis gem version 2.1.1. Try to update the redis gem to latest, which is version 3.0.4.

To update the redis gem, you can either run

gem update redis

to update the locally installed version, or run

bundle update redis

to update the redis gem that is installed as part of your Gemfile.

$ irb
1.9.3p392 :001 > require 'redis'
 => true 
1.9.3p392 :002 > Redis.new(:host => 'localhost', :port => 6379)
ArgumentError: odd number of arguments for Hash
from /Users/zachallett/.rvm/gems/ruby-1.9.3-p392/gems/redis-2.1.1/lib/redis.rb:65:in `[]'
from /Users/zachallett/.rvm/gems/ruby-1.9.3-p392/gems/redis-2.1.1/lib/redis.rb:65:in `info'
from /Users/zachallett/.rvm/gems/ruby-1.9.3-p392/gems/redis-2.1.1/lib/redis.rb:606:in `inspect'
from /Users/zachallett/.rvm/rubies/ruby-1.9.3-p392/bin/irb:16:in `<main>'

.

$ irb
1.9.3p392 :001 > require 'redis'
 => true 
1.9.3p392 :002 > Redis.new(:host => 'localhost', :port => 6379)
 => #<Redis client v3.0.4 for redis://localhost:6379/0>

Upvotes: 7

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