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class PropertiesController < ApplicationController
  before_filter :authorise_action
...

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filename    = 'process.log'
ids         = {}
...

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# GET /neighbourhoods/map_filter
def map_filter
  @map_filter_errors  = nil # Stores errors related to a filter request.
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class PropertyFilter < ActiveRecord::BaseWithoutTable
  attr_accessible :price_direction, :price # ...many more attributes...

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  def self.filter_price(direction, price)
    return nil if direction.blank? or price.blank?
    return {:error => 'Invalid argument: direction'} unless ['at most', 'at least'].include? direction
...