Getting an error when trying to require active_record

Question

In my Gemfile I have:

source 'https://rubygems.org'

gem 'pry'
gem 'pg'
gem 'activerecord'

In my app.rb file I have:

require 'active_record'
require 'pg'
require 'pry'



ActiveRecord::Base.establish_connection(
    database: 'hospital_db',
    adapter: 'postgresql'
)

class Doctor < ActiveRecord::Base
  has_many :appointments, :skills
  has_many :patients, through: :appointments
end

class Patient < ActiveRecord::Base
  has_many :appointments
  has_many :doctors, through: :appointments
end

class Appointment < ActiveRecord::Base
  belongs_to :patient
  belongs_to :doctor
end

class Skill < ActiveRecord::Base
  belongs_to :doctor
end

binding.pry

As soon as I type ruby app.rb in my terminal I get the following errors:

/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::BASE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of BASE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_ALL
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of EXCEPTION_ALL was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_NaN
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of EXCEPTION_NaN was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_INFINITY
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of EXCEPTION_INFINITY was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_UNDERFLOW
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of EXCEPTION_UNDERFLOW was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_OVERFLOW
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of EXCEPTION_OVERFLOW was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::EXCEPTION_ZERODIVIDE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of EXCEPTION_ZERODIVIDE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_MODE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_MODE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_UP
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_UP was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_DOWN
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_DOWN was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_UP
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_HALF_UP was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_DOWN
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_HALF_DOWN was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_CEILING
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_CEILING was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_FLOOR
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_FLOOR was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::ROUND_HALF_EVEN
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of ROUND_HALF_EVEN was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NaN
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_NaN was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_ZERO
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_POSITIVE_ZERO was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_ZERO
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_NEGATIVE_ZERO was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_FINITE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_POSITIVE_FINITE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_FINITE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_NEGATIVE_FINITE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_POSITIVE_INFINITE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_POSITIVE_INFINITE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::SIGN_NEGATIVE_INFINITE
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of SIGN_NEGATIVE_INFINITE was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::INFINITY
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of INFINITY was here
/Users/andrewkim/.rvm/gems/ruby-2.1.5@global/extensions/x86_64-darwin-14/2.1.0-static/bigdecimal-1.2.5/bigdecimal.bundle: warning: already initialized constant BigDecimal::NAN
/Users/andrewkim/.rvm/rubies/ruby-2.1.5/lib/ruby/site_ruby/2.1.0/rubygems/core_ext/kernel_require.rb:121: warning: previous definition of NAN was here
WARN: Unresolved specs during Gem::Specification.reset:
      json (>= 1.7.7, ~> 1.7)
      minitest (~> 5.1)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.
/Users/andrewkim/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.1/lib/active_record/associations/builder/association.rb:64:in `initialize': undefined method `arity' for :skills:Symbol (NoMethodError)
    from /Users/andrewkim/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.1/lib/active_record/associations/builder/collection_association.rb:18:in `initialize'
    from /Users/andrewkim/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.1/lib/active_record/associations/builder/association.rb:47:in `new'
    from /Users/andrewkim/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.1/lib/active_record/associations/builder/association.rb:47:in `create_builder'
    from /Users/andrewkim/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.1/lib/active_record/associations/builder/association.rb:35:in `build'
    from /Users/andrewkim/.rvm/gems/ruby-2.1.5/gems/activerecord-4.2.1/lib/active_record/associations.rb:1259:in `has_many'
    from app.rb:13:in `<class:Doctor>'
    from app.rb:12:in `<main>'

I imagine it's something simple, but I've tried bundle install again, and I can't figure out why its trying to override BigDecimal Constant or how I can fix it. I tried requiring activerecord and active-record but they give an easy cannot load such file error. So require active_record has got to be the right one. Any thoughts or suggestions?

It is not having any problem requiring ActiveRecord. Your first warning is an issue in the Ruby kernel, the second is a problem specifically with your Doctor class. Are you showing your entire Doctor class? — Beartech, Mar 29 '15 at 20:58
yes, the only code I have in this directory is what I've posted except for a `schema.sql` file — Andrew Kim, Mar 29 '15 at 21:03

score 2 · Answer 1 · answered Mar 29 '15 at 21:08

2

I'm not sure why bigdecimal is being loaded multiple times. However your Gemfile won't actually be used unless you put

require "bundler/setup"

At the top of the script.

The actual error however is because of the line

has_many :appointments, :skills

You can't list multiple associations like that - it needs to be two separate calls to has_many:

has_many :appointments
has_many :skills

answered Mar 29 '15 at 21:08

Frederick Cheung

83,189
8
152
174

require "bundler/setup" - removes strings with warnings if you insert it in app.rb – Evgeny Palguev Aug 15 '15 at 17:47

Beartech · Accepted Answer · 2015-03-29T21:13:45.283

1

This looks wrong to me and I have tried to find a reference to it in the API:

class Doctor < ActiveRecord::Base
  has_many :appointments, :skills

The correct syntax is:

 has_many :appointments
 has_many: skills

edited Mar 29 '15 at 21:13

answered Mar 29 '15 at 21:04

Beartech

6,173
1
18
41

I think that fixed part of it. Thank you! however, it doesn't fix the warnings of the already initialized constant BigDecimal. It works now, but I don't like the ugly warning – Andrew Kim Mar 29 '15 at 21:08
Well, I'd say that's the correct answer then for the specific question. Were you trying to list multiple has-many relations on one line? – Beartech Mar 29 '15 at 21:09
I believe this might help with your warnings: http://stackoverflow.com/questions/17936340/unresolved-specs-during-gemspecification-reset – Beartech Mar 29 '15 at 21:10
yes, that answers it; however, any ideas as to why i'm getting the warning for BigDecimal constant being reloaded? – Andrew Kim Mar 29 '15 at 21:11
I tried running `bundle clean --force` I'm still getting the same warnings, and I tried the different bundle commands referenced in that post, but just get error `bundler: command not found: ` in my case active record – Andrew Kim Mar 29 '15 at 21:16
I'll do some research to try and get rid of the warnings, but thanks for the solution! – Andrew Kim Mar 29 '15 at 21:17
Ah, I don't see the bundler error listed above. Can you add it for posterity and maybe a specific answer will emerge. Also can you try starting `irb` in the same directory as your project and running the line `require 'active_record'` ? – Beartech Mar 29 '15 at 21:23
Also, maybe run `rvm list gemsets`. If you have "ruby-2.1.5@global" and a gemset that DOESN'T have "@global" for the same ruby version, try switching to the non-global version. i.e. `rvm gemset ruby-2.1.5-...` – Beartech Mar 29 '15 at 21:32
When i run `require 'active_record'` in irb in that director i get the same warnings – Andrew Kim Mar 29 '15 at 21:41

Getting an error when trying to require active_record

2 Answers2