Features

• add a location to your models (latitude/longitude)
• find other models in a certain radius
• find other models on the same map (giving map size in pixels and zoom level)
• prevent assignment of a default location (value your map script uses as default/starting point)

INSTALL

gem i has_a_location

Table with (see: MIGRATION):

lat
lng

Model:

User < ActiveRecord::Base
  has_a_location default_location_lat: 10.10, default_location_lng: 20.20
end

USAGE

• user.location = [12.2332,323.2323] [latitude,longitude]
• show_map if user.location
• user.in_radius(500) => users in 500 miles distance
• User.on_map([11.12343,34,183323],[640,480],5) => all users visible on a 640x480 map zoom-level 5, with center 11.12343,34,183323
• user.surrounding_on_map([640,480],5) => other users visible on this map

OPTIONS

Legend: options key => default [recommended]
default_location_lng: 0 [your default map longitude]
default_location_lat: 0 [your default map latitude]
default_units: :miles [:kms]
default_formula: :sphere [:flat]
lat_column_name: :lat [:location_latitude]
lng_column_name: :lng [:location_longitude]
distance_column_name: :distance [:distance]

TODO

• latitude calculation is theoretically (wrong theory?) wrong put works practically...

AUTHOR

Michael Grosser
michael@grosser.it
License: MIT