Merge @jhdavids8's failing spec for #374

and clean up schema.rb a bit.

Thanks to Jamie Davidson for the test!

This is to help anyone who wants / needs to fix #374.

- Fork Ransack to your repo

- Open the file `ransack/spec/ransack/search_spec.rb` and uncomment the
test beginning at line 220

- Set the Rails version you'd like to test in ransack's Gemfile
('4-1-stable', '4.2.1', etc.)

- In the console, run `bundle install` then `bundle exec rake spec`

- Write a fix that makes this test pass!

- Send a pull request :)

spec/blueprints/recommendations.rb

@@ -0,0 +1,5 @@
+Recommendation.blueprint do
+  article
+  person
+  target_person { person }
+end

spec/ransack/search_spec.rb

@@ -214,6 +214,16 @@ module Ransack
           children_people_name_field} = 'Ernie'/
       end
 
+      # Uncomment the following failing spec by Jamie Davidson / @jhdavids8
+      # for testing issue #374:
+      # https://github.com/activerecord-hackery/ransack/issues/374
+      #
+      # it 'evaluates conditions for multiple belongs_to associations to the same table contextually' do
+      # search = Search.new(Recommendation, person_name_eq: 'Ernie', target_person_parent_name_eq: 'Test')
+      # search.result.should be_an ActiveRecord::Relation
+      # search.result.to_sql.should == "SELECT \"recommendations\".* FROM \"recommendations\" LEFT OUTER JOIN \"people\" ON \"people\".\"id\" = \"recommendations\".\"person_id\" LEFT OUTER JOIN \"people\" \"target_people_recommendations\" ON \"target_people_recommendations\".\"id\" = \"recommendations\".\"target_person_id\" LEFT OUTER JOIN \"people\" \"parents_people\" ON \"parents_people\".\"id\" = \"target_people_recommendations\".\"parent_id\" WHERE ((\"people\".\"name\" = 'Ernie' AND \"parents_people\".\"name\" = 'Test'))"
+      # end
+
       it 'evaluates compound conditions contextually' do
         search = Search.new(Person, :children_name_or_name_eq => 'Ernie').result
         expect(search).to be_an ActiveRecord::Relation

spec/support/schema.rb

@@ -1,6 +1,6 @@
 require 'active_record'
 
-case ENV['DB'].downcase
+case ENV['DB'].try(:downcase)
 when 'mysql', 'mysql2'
   # To test with MySQL: `DB=mysql bundle exec rake spec`
   ActiveRecord::Base.establish_connection(
@@ -113,6 +113,12 @@ class Article < ActiveRecord::Base
   end
 end
 
+class Recommendation < ActiveRecord::Base
+  belongs_to :person
+  belongs_to :target_person, class_name: 'Person'
+  belongs_to :article
+end
+
 module Namespace
   class Article < ::Article
 
@@ -161,33 +167,38 @@ def self.create
       end
 
       create_table :articles, :force => true do |t|
-        t.integer :person_id
-        t.string  :title
-        t.text    :subject_header
-        t.text    :body
+        t.integer  :person_id
+        t.string   :title
+        t.text     :subject_header
+        t.text     :body
       end
 
       create_table :comments, :force => true do |t|
-        t.integer :article_id
-        t.integer :person_id
-        t.text :body
+        t.integer  :article_id
+        t.integer  :person_id
+        t.text     :body
       end
 
       create_table :tags, :force => true do |t|
-        t.string :name
+        t.string   :name
       end
 
       create_table :articles_tags, :force => true, :id => false do |t|
-        t.integer :article_id
-        t.integer :tag_id
+        t.integer  :article_id
+        t.integer  :tag_id
       end
 
       create_table :notes, :force => true do |t|
-        t.integer :notable_id
-        t.string :notable_type
-        t.string :note
+        t.integer  :notable_id
+        t.string   :notable_type
+        t.string   :note
       end
 
+      create_table :recommendations, :force => true do |t|
+        t.integer  :person_id
+        t.integer  :target_person_id
+        t.integer  :article_id
+      end
     end
 
     10.times do