Class: Mongoid::Contexts::Mongo

Inherits:
Object
  • Object
show all
Defined in:
lib/mongoid_location/contexts/mongo.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#geo_near(center, opts = {}) ⇒ Array

Fetches rows from the data base sorted by distance. In MongoDB versions 1.7 and above it returns a distance. Uses all criteria chains except without, only, asc, desc, order_by

Examples:

Minimal Query


Address.geo_near([70,40])

Chained Query


Address.where(:state => 'ny').geo_near([70,40])

Calc Distances Query


Address.geo_near([70,40], :max_distance => 5, :unit => 5)

Parameters:

  • center (Array, Hash, #to_xy) —

    The center of where to calculate distance from

  • opts (Hash) (defaults to: {}) —

    the options to query with

Returns:

  • (Array) —

    Sorted Rows



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# File 'lib/mongoid_location/contexts/mongo.rb', line 33

def geo_near(center, opts = {})
  opts = self.options.merge(opts)
  # convert point
  center = center.to_xy if center.respond_to?(:to_xy)
  center = [center.x, center.y] if center.respond_to?(:x)

  # set default opts
  opts[:skip] ||= 0

  if unit = Mongoid::Location.earth_radius[opts[:unit]]
    opts[:unit] = (opts[:spherical]) ? unit : unit * Mongoid::Location::RAD_PER_DEG
  end

  if unit = Mongoid::Location.earth_radius[opts[:distance_multiplier]]
    opts[:distance_multiplier] = (opts[:spherical]) ? unit : unit * Mongoid::Location::RAD_PER_DEG
  end

  opts[:distance_multiplier] = opts[:unit] if opts[:unit].kind_of?(Numeric)

  # setup paging.
  if opts.has_key?(:page)
    opts[:page] ||= 1
    opts[:paginator] ||= Mongoid::Location.paginator()

     if opts[:per_page].blank?
       opts[:per_page] = case opts[:paginator]
                        when :will_paginate
                          @document.per_page
                        when :kaminari
                          Kaminari.config.default_per_page
                        else
                          Mongoid::Location.default_per_page
                        end
       opts[:per_page] = opts[:per_page].to_i
     end

  end
  opts[:query] = create_geo_near_query(center,opts)
  results = klass.db.command(opts[:query])
  Mongoid::Location::GeoNearResults.new(klass,results,opts)
end