I am building an API for a webbapp using Ruby On Rails, i am using Jbuilder for API/JSON and Geokit.
I have this models:
Campaign
class Campaign < ActiveRecord::Base
belongs_to :company
belongs_to :venue
belongs_to :category
has_and_belongs_to_many :venues
has_many :cities, through: :venues
has_many :uses
end
Company
class Company < ActiveRecord::Base
has_many :venues
has_many :campaigns
validates :name, presence: true
end
Venue
class Venue < ActiveRecord::Base
acts_as_mappable :default_units => :kms,
:lat_column_name => :lat,
:lng_column_name => :lng
belongs_to :company
belongs_to :city
has_and_belongs_to_many :campaigns
end
I am trying to list all campaigns by given latitude and longitude coordinates, like this:
class API::CampaignsController < ApplicationController
respond_to :json
def index
@campaigns = filter
respond_with @campaigns
end
def filter
if params[:city_id]
Campaign.includes(:venues, :cities).where('cities.id' => params[:city_id])
elsif params[:lat] && params[:lng]
lat = params[:lat].to_f
lng = params[:lng].to_f
Campaign.includes(:venues, :cities).within(10, :origin => [lat, lng])
end
end
end
But all I get is a empty hash:
{
campaigns: [ ]
}
Any ides on what I am doing wrong and how I can fix this?
As per the server log, GET "/api/campaigns?lat=55.563466?lng=12.973509"
, you are not passing params[:city_id]
so your BOTH conditions in filter
method will fail and no query would be executed. Hence, empty campaigns
.
acts_as_mappable
is on Venue
model so within
is available only for that model. I think you want filter
method as below:
def filter
if params[:city_id]
Campaign.includes(:venues, :cities).where('cities.id' => params[:city_id])
elsif params[:lat] && params[:lng]
lat = params[:lat].to_f
lng = params[:lng].to_f
Venue.within(10, :origin => [lat, lng]).includes(:campaigns, :city).each do |venue|
campaigns << venue.campaigns
end
campaigns
end
end
Also, the url should be /api/campaigns?lat=55.563466&lng=12.973509
.
NOTICE:
Pass lng
as a separate query param
with &
prefix as &lng
and not as ?lng
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