re: #501; Add config option for tracking associations with a logical …

…default

lib/paper_trail/config.rb

@@ -5,6 +5,7 @@ class Config
     include Singleton
     attr_accessor :enabled, :timestamp_field, :serializer, :version_limit
     attr_reader :serialized_attributes
+    attr_writer :track_associations
 
     def initialize
       @enabled         = true # Indicates whether PaperTrail is on or off.
@@ -27,5 +28,10 @@ def serialized_attributes=(value)
       end
       @serialized_attributes = value
     end
+
+    def track_associations
+      @track_associations ||= PaperTrail::VersionAssociation.table_exists?
+    end
+    alias_method :track_associations?, :track_associations
   end
 end

lib/paper_trail/has_paper_trail.rb

@@ -374,7 +374,7 @@ def record_destroy
 
       # saves associations if the join table for `VersionAssociation` exists
       def save_associations(version)
-        return unless PaperTrail::VersionAssociation.table_exists?
+        return unless PaperTrail.config.track_associations?
         self.class.reflect_on_all_associations(:belongs_to).each do |assoc|
           assoc_version_args = {
               :version_id => version.id,

lib/paper_trail/version_concern.rb

@@ -11,7 +11,7 @@ module VersionConcern
       # association when the test suite is running. This makes it pass
       # when DB is not initialized prior to test runs such as when we run on
       # Travis CI (there won't be a db in `test/dummy/db/`)
-      if PaperTrail::VersionAssociation.table_exists? || ::Rails.env.test?
+      if PaperTrail.config.track_associations?
         has_many :version_associations, :dependent => :destroy
       end
 

spec/rails_helper.rb

@@ -20,6 +20,9 @@
 # If you are not using ActiveRecord, you can remove this line.
 ActiveRecord::Migration.check_pending! if ActiveRecord::Migration.respond_to?(:check_pending!)
 
+# Turn on associations tracking when the test suite is run on Travis CI
+PaperTrail.config.track_associations = true if ENV['TRAVIS']
+
 RSpec.configure do |config|
   config.fixture_path = "#{::Rails.root}/spec/fixtures"
 

test/test_helper.rb

@@ -39,6 +39,9 @@ class ActiveSupport::TestCase
   end
 end
 
+# Turn on associations tracking when the test suite is run on Travis CI
+PaperTrail.config.track_associations = true if ENV['TRAVIS']
+
 #
 # Helpers
 #