Doesn't work with polymorphic relationships

[mhuggins]

Trying to use this in conjunction with a polymorphic association from my base class, but it's trying to execute some defunct SQL.

My classes:

class Activity < ActiveRecord::Base
  acts_as_citier

  belongs_to :profile
  belongs_to :entity, :polymorphic => true

  validates :profile_id, :presence => true
  validates :entity_type, :presence => true
  validates :entity_id, :presence => true, :uniqueness => {:scope => [:entity_type, :entity_id]}
end

class Activity::SetProfilePhoto < Activity
  acts_as_citier
end

And my migrations:

class CreateActivities < ActiveRecord::Migration
  def self.up
    create_table :activities do |t|
      t.string :type, :null => false
      t.integer :profile_id, :null => false
      t.string :entity_type, :null => false
      t.integer :entity_id, :null => false
      t.timestamps
    end

    add_index :activities, [:profile_id, :entity_type, :entity_id]
  end

  def self.down
    drop_table :activities
  end
end

class CreateActivityUploadPhotos < ActiveRecord::Migration
  def self.up
    create_table :activity_upload_photos do |t|
      # nothing extra for now, will add more fields later
    end
    create_citier_view Activity::UploadPhoto
  end

  def self.down
    drop_citier_view Activity::UploadPhoto
    drop_table :activity_upload_photos
  end
end

And finally, the class where I'm attempting to create the activity. (Everything else in this class works prior to using this, so I've just included the relevant code.)

class Photo < ActiveRecord::Base
  belongs_to :profile
  after_create :create_activity

  def create_activity
    Activity::UploadPhoto.create!(:profile => self.profile, :entity => self)
  end
end

When the Activity::UploadPhoto::create! method is called, it generates the following SQL errors/queries:

Mysql::Error: Unknown column 'view_activity_upload_photos.entity_id' in 'where clause': SELECT activities.id FROM activities WHERE activities.entity_type = 'Photo' AND activities.entity_id = 1 AND (view_activity_upload_photos.entity_id = 1) LIMIT 1