Class: Mongoid::Criterion::NearSpatial

Inherits:
Complex
  • Object
show all
Defined in:
lib/mongoid_location/criterion/near_spatial.rb

Overview

NearSpecial criterion is used when performing #near with symbols to get get a shorthand syntax for where clauses.

Examples:

Coninputersion of a simple to complex criterion.

{ :field => { "$nearSphere" => [20,30]}, '$maxDistance' => 5 }
becomes:
{ :field.near_sphere => {:point => [20,30], :max => 5, :unit => :km} }

Instance Attribute Summary

Attributes inherited from Complex

#key, #operator

Instance Method Summary collapse

Methods inherited from Complex

#initialize

Constructor Details

This class inherits a constructor from Mongoid::Criterion::Complex

Instance Method Details

#to_mongo_query(input) ⇒ Object

Coninputert input to query for near or nearSphere

Examples:

near = NearSpatial.new(:key => :field, :operator => "near")
near.to_mongo_query({:point => [:50,50], :max => 5, :unit => :km}) => { '$near : [50,50]' , '$maxDistance' : 5 }

Parameters:

  • input (Hash, Array) —

    input to coninputer to query



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# File 'lib/mongoid_location/criterion/near_spatial.rb', line 21

def to_mongo_query(input)
  if input.respond_to?(:x)
    {"$#{operator}" => [input.x, input.y]} #, '$maxDistance' => input[1] }
  elsif input.kind_of?(Hash)
    raise ':point required to make valid query' unless input[:point]
    input[:point] = input[:point].to_xy if input[:point].respond_to?(:to_xy)
    query = {"$#{operator}" => input[:point] }
    if input[:max]
      query['$maxDistance'] = input[:max].to_f

      if unit = Mongoid::Location.earth_radius[input[:unit]]
        unit *= Mongoid::Location::RAD_PER_DEG unless operator =~ /sphere/i
        input[:unit] = unit
      end

      query['$maxDistance'] = query['$maxDistance']/input[:unit].to_f if input[:unit]
    end
    query
  elsif input.kind_of? Array
    if input.first.kind_of? Numeric
      {"$#{operator}" => input }
    else
      input[0] = input[0].to_xy if input[0].respond_to?(:to_xy)
      {"$#{operator}" => input[0], '$maxDistance' => input[1] }
    end
  end
end