I have 3 models : User, Location, Picture. A Location has several pictures, and a User can provide several pictures.
I use rabl to render the result of my query in json. My problem is that I don't know how to display the user name from the user id in this relation ?
I designed my models like that :
Picture :
class Picture < ActiveRecord::Base
...
belongs_to :location
belongs_to :user
...
end
User :
class User < ActiveRecord::Base
...
has_many :pictures
accepts_nested_attributes_for :pictures
attr_accessible :name, :email
...
end
Location :
class Location < ActiveRecord::Base
...
has_many :pictures, :dependent => :destroy
accepts_nested_attributes_for :pictures
attr_accessible :name, :address
...
end
My rabl file :
object false
collection @locations
attributes :id, :name, :address
child :pictures do
attributes :id, :location_id, :url, :user_id, :created_at
end
I tried to add :user_name in the child :pictures block, but obviously it fails... How can I access it ?
EDIT :
When I add
node(:user_name) { |picture| picture.user.name }
as mentioned by Jesse, I get this error in the logs :
2013-08-08T00:20:18.911561+00:00 app[web.1]:
2013-08-08T00:20:18.911561+00:00 app[web.1]: ActionView::Template::Error (undefined method `name' for nil:NilClass):
2013-08-08T00:20:18.911561+00:00 app[web.1]: 1: object false
2013-08-08T00:20:18.911561+00:00 app[web.1]: 2: collection @locations
2013-08-08T00:20:18.911561+00:00 app[web.1]: 3:
2013-08-08T00:20:18.911561+00:00 app[web.1]: 4: attributes :id, :name, :address, :city, :state, :zipcode, :country_name, :latitude, :longitude, :distance
2013-08-08T00:20:18.911561+00:00 app[web.1]: 5:
2013-08-08T00:20:18.911561+00:00 app[web.1]: app/views/api/v1/locations/index.json.rabl:2:in `_app_views_api_v__locations_index_json_rabl___4323955523361468965_70365132977020'
Thanks !