Could not find matching strategy for :saml. You may need to install an additional gem (such as omniauth-saml).

[gotoAndBliss]

Getting this after a basic installation :

gem 'omniauth'
gem 'omniauth-saml'

It returns :

active_support/dependencies.rb:251:in `require': no such file to load -- omniauth/core (LoadError)

So I add that to the gemfile though the ReadMe.md doesn't suggest so :

   gem "oa-core"

Now it gets me to here :

my_project/gems/omniauth-1.1.1/lib/omniauth/builder.rb:39:in `rescue in provider': Could not find matching strategy for :saml. You may need to install an additional gem (such as omniauth-saml). (LoadError)

Not sure what to do/think ..

[rajiv]

you shouldn't need to add the oa-core gem. what does your Gemfile.lock look like without the oa-core line in Gemfile, and after you run bundle ?

[gotoAndBliss]

What it looks like with oa-core removed, and after I run bundle

DEPENDENCIES
  omniauth
  omniauth-saml

GEM
  remote: http://rubygems.org/
  specs:
    oauth2 (0.8.0)
      faraday (~> 0.8)
      httpauth (~> 0.1)
      jwt (~> 0.1.4)
      multi_json (~> 1.0)
      rack (~> 1.2)
    omniauth (1.1.1)
      hashie (~> 1.2)
      rack
    omniauth-saml (1.0.0)
      omniauth (~> 1.1)
      ruby-saml (~> 0.6)

No oa-core is listed elsewhere..

I should ask as well, should I not be trying to use Devise with this gem? Perhaps there's a conflict.

[rajiv]

could you paste your full Gemfile and Gemfile.lock. this looks like a dependency issue as oa-core is part of the pre-1.0 omniauth code and no longer supported.

make sure you're running the latest devise with bundle outdated. the latest versions support omniauth: https://github.com/plataformatec/devise/wiki/OmniAuth%3a-Overview

[gotoAndBliss]

That seems to have resolved it. Thanks so much Rajiv! You're the best!!