Only strip strings in step definitions

This allows for cucumber transforms to create different data structrues
and still work with factory girl steps.

Closes #185

features/factory_girl_steps.feature

@@ -198,3 +198,19 @@ Feature: Use step definitions generated by factories
     Then I should find the following for the last user:
       | id  | name | admin |
       | 123 | Joe  | true  |
+
+  Scenario: Transform parses string data into array before assigning to an association
+    Given the following tags exist:
+      | name  |
+      | funky |
+      | cool  |
+      | hip   |
+    And the following post exists:
+      | title       | tags      |
+      | Tagged post | cool, hip |
+    Then the post "Tagged post" should have the following tags:
+      | name |
+      | cool |
+      | hip  |
+    And the post "Tagged post" should not have the following tags:
+      | funky |

features/step_definitions/database_steps.rb

@@ -11,8 +11,30 @@
   model_class.count.should == count.to_i
 end
 
+Then /^the post "([^"]*)" should (not )?have the following tags?:$/ do |post_title, negate, table|
+  post = Post.find_by_title!(post_title)
+
+  table.hashes.each do |row|
+    tag = Tag.find_by_name(row[:name])
+
+    if negate
+      post.tags.should_not include(tag)
+    else
+      post.tags.should include(tag)
+    end
+  end
+end
+
+Transform /^table:(?:.*,)?tags(?:,.*)?$/ do |table|
+  table.map_column!("tags") do |tags|
+    tags.split(',').map {|tag| Tag.find_by_name! tag.strip }
+  end
+  table
+end
+
 Before do
   Post.delete_all
+  Tag.delete_all
   User.delete_all
   Category.delete_all
   CategoryGroup.delete_all

features/support/factories.rb

@@ -21,6 +21,11 @@ def self.up
       t.string :name
     end
 
+    create_table :tags, :force => true do |t|
+      t.integer :post_id
+      t.string :name
+    end
+
     create_table :users, :force => true do |t|
       t.string  :name
       t.boolean :admin, :default => false, :null => false
@@ -43,6 +48,11 @@ class Category < ActiveRecord::Base
 class Post < ActiveRecord::Base
   belongs_to :author, :class_name => 'User'
   belongs_to :category
+  has_many :tags
+end
+
+class Tag < ActiveRecord::Base
+  belongs_to :post
 end
 
 class NonActiveRecord
@@ -74,6 +84,9 @@ class NonActiveRecord
     category
   end
 
+  factory :tag do
+    post
+  end
   # This is here to ensure that factory step definitions don't raise for a non-AR factory
   factory :non_active_record do
   end

lib/factory_girl/step_definitions.rb

@@ -21,7 +21,8 @@ def attributes(strategy = CreateAttributes)
     private
 
     def process_key_value(key, value)
-      [key.downcase.gsub(' ', '_').to_sym, value.to_s.strip]
+      value = value.strip if value.is_a?(String)
+      [key.downcase.gsub(' ', '_').to_sym, value]
     end
 
     class AssociationManager