remove AR dependency from PaginatedCollection gem

fixes: CNVS-12271

test plan:
- no test needed, spec changes only

Change-Id: I54a814319e17f8ca05c5b8652fc13db70258ff5a
Reviewed-on: https://gerrit.instructure.com/33515
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Simon Williams <simon@instructure.com>
QA-Review: Simon Williams <simon@instructure.com>
Reviewed-by: Jacob Fugal <jacob@instructure.com>

gems/paginated_collection/paginated_collection.gemspec

@@ -21,11 +21,9 @@ Gem::Specification.new do |spec|
   if CANVAS_RAILS3
     spec.add_dependency "folio-pagination", "0.0.7"
     spec.add_dependency "will_paginate", "3.0.4"
-    spec.add_dependency "rails", "~> 3.2"
   else
     spec.add_dependency "folio-pagination-legacy", "0.0.3"
     spec.add_dependency "will_paginate", "2.3.15"
-    spec.add_dependency "rails", "~> 2.3"
   end
 
   spec.add_development_dependency "bundler", "~> 1.5"

gems/paginated_collection/spec/paginated_collection/paginated_collection_spec.rb

@@ -44,15 +44,12 @@ describe PaginatedCollection do
     end
 
     it 'uses the pager returned' do
-      example_klass = Class.new(ActiveRecord::Base) do
-        self.table_name = 'examples'
-      end
-
-      3.times { example_klass.create! }
+      # using WillPaginate Array to get WillPaginate style object
+      @simple = ('a' .. 'c').to_a
 
       proxy = PaginatedCollection.build do |pager|
-        result = example_klass.paginate(page: pager.current_page, per_page: pager.per_page)
-        result.map! { |example| example.id }
+        result = @simple.paginate(page: pager.current_page, per_page: pager.per_page)
+        result.map! { |example| example }
         result
       end
 
@@ -66,8 +63,8 @@ describe PaginatedCollection do
       expect(p2.next_page).to be_nil
       expect(p2.previous_page).to eq 1
 
-      expect(p1).to eq example_klass.all.map(&:id)[0, 2]
-      expect(p2).to eq example_klass.all.map(&:id)[2, 1]
+      expect(p1).to eq @simple[0, 2]
+      expect(p2).to eq @simple[2, 1]
     end
   end
 end

gems/paginated_collection/spec/spec_helper.rb

@@ -1,9 +1,5 @@
-require 'folio/rails'
-require 'folio/will_paginate/active_record' if defined?(CANVAS_RAILS3) && CANVAS_RAILS3
-
 require 'paginated_collection'
-
-require 'support/active_record'
+require 'will_paginate/array'
 
 RSpec.configure do |config|
   config.treat_symbols_as_metadata_keys_with_true_values = true