# Copyright 2011-2013, The Trustees of Indiana University and Northwestern
#   University.  Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
# 
# You may obtain a copy of the License at
# 
# http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing, software distributed 
#   under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
#   CONDITIONS OF ANY KIND, either express or implied. See the License for the 
#   specific language governing permissions and limitations under the License.
# ---  END LICENSE_HEADER BLOCK  ---

class UniquenessValidator < ActiveModel::EachValidator
  def initialize(options)
    unless options[:solr_name].present?
      raise ArgumentError, "UniquenessValidator was not passed :solr_name. Example: validates :uniqueness => { :solr_name => 'name_tesim' }"
    end
    @solr_field = options[:solr_name]
    super
  end
  def validate_each(record, attribute, value)
    klass = record.class
    existing_doc = find_doc(klass, value)
    
    if ! existing_doc.nil? && existing_doc.pid != record.pid
      record.errors.add attribute, :taken, value: value
    end
  end
  def find_doc(klass, value)
    klass.where(@solr_field => value).first
  end
end 
