Adding user_certifications relation, and paperclip gem

app/models/certification.rb

@@ -1,4 +1,5 @@
 class Certification < ActiveRecord::Base
   attr_accessible :description, :name
-  has_many :users, :through => :certifications_users
+  has_many :user_certifications
+  has_many :users, :through => :user_certifications
 end

app/models/user.rb

@@ -6,8 +6,9 @@ class User < ActiveRecord::Base
          :recoverable, :rememberable, :trackable, :validatable
 
   # Setup accessible (or protected) attributes for your model
-  attr_accessible :email, :password, :password_confirmation, :remember_me, :name, :admin, :instructor, :active, :emergency_name, :emergency_phone, :current_skills, :desired_skills, :waiver, :emergency_email, :phone, :payment_method, :orientation, :member_level
+  attr_accessible :email, :password, :password_confirmation, :remember_me, :name, :admin, :instructor, :active, :emergency_name, :emergency_phone, :current_skills, :desired_skills, :waiver, :emergency_email, :phone, :payment_method, :orientation, :member_level, :certifications
 
   has_many :cards
-  has_many :certifications, :through => :certifications_users
+  has_many :user_certifications
+  has_many :certifications, :through => :user_certifications
 end

app/models/user_certification.rb

@@ -0,0 +1,5 @@
+class UserCertification < ActiveRecord::Base
+  attr_accessible :certification_id, :user_id
+  belongs_to :user
+  belongs_to :certification
+end