Ruby on Rails - geocode the model in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails
Geocode the model
- To render markers, the google maps api, by default, requires a position hash which has longitude and latitude stored as lng and lat respectively.
- This position hash can be created in javascript, later, or here when defining the json representation of the address field:
- To provide this position as json attribute of the address field, just override the as_json method on the model.
- Suppose, your users and/or groups have profiles and you want to display address profile fields on a google map.
# app/models/profile_fields/address.rb
class ProfileFields::Address < ProfileFields::Base
# Attributes:
# label, e.g. "Work address"
# value, e.g. "Willy-Brandt-Straße 1\n10557 Berlin"
endClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
- A great way to geocode the addresses, i.e. provide longitude and latitude is the geocoder gem.
- Add geocoder to your Gemfile and run bundle to install it.
# Gemfile
gem 'geocoder', '~> 1.3'Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
Add database columns for latitude and longitude in order to save the location in the database. This is more efficient than querying the geocoding service every time you need the location. It's faster and you're not hitting the query limit so quickly.
bin/rails generate migration add_latitude_and_longitude_to_profile_fields \
latitude:float longitude:float
bin/rails db:migrate # Rails 5, or:
rake db:migrate # Rails 3, 4Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
Add the geocoding mechanism to your model. In this example, the address string is stored in the value attribute. Configure the geocoding to perform when the record has changed, and only whan a value is present:
# app/models/profile_fields/address.rb
class ProfileFields::Address < ProfileFields::Base
geocoded_by :value
after_validation :geocode, if: ->(address_field){
address_field.value.present? and address_field.value_changed?
}
endClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team
Geocoder uses google as lookup service. It has lots of interesting features like distance calculations or proximity search.