refactor: Enhance N1QL queries for airlines and routes

Updated N1QL queries in the Airline and Route models to include type checks for 'airline' and 'route', respectively, ensuring more accurate data retrieval. Additionally, modified the airlines_spec to include new airline entries and removed duplicates for improved test accuracy.

Changes:
- Added type conditions in N1QL queries for better data filtering
- Updated expected airline data in airlines_spec for consistency

Author: teetangh

app/models/airline.rb

@@ -29,6 +29,6 @@ class Airline < CouchbaseOrm::Base
   }
 
   n1ql :to_airport, query_fn: proc { |bucket, values, options|
-    cluster.query("SELECT raw META(air).id FROM (SELECT DISTINCT META(airline).id AS airlineId FROM `#{bucket.name}` AS route JOIN `#{bucket.name}` AS airline ON route.airlineid = META(airline).id WHERE route.destinationairport = #{quote(values[0])}) AS subquery JOIN `#{bucket.name}` AS air ON META(air).id = subquery.airlineId LIMIT #{values[1]} OFFSET #{values[2]}", options)
+    cluster.query("SELECT raw META(air).id FROM (SELECT DISTINCT META(airline).id AS airlineId FROM `#{bucket.name}` AS route JOIN `#{bucket.name}` AS airline ON route.airlineid = META(airline).id AND airline.type = 'airline' WHERE route.type = 'route' AND route.destinationairport = #{quote(values[0])} ORDER BY META(airline).id) AS subquery JOIN `#{bucket.name}` AS air ON META(air).id = subquery.airlineId AND air.type = 'airline' LIMIT #{values[1]} OFFSET #{values[2]}", options)
   }
 end

app/models/route.rb

@@ -28,6 +28,6 @@ class Route < CouchbaseOrm::Base
   validates :distance, presence: true, numericality: { greater_than_or_equal_to: 0 }
 
   n1ql :direct_connections, query_fn: proc { |bucket, values, options|
-    cluster.query("SELECT distinct raw meta(route).id FROM `#{bucket.name}` AS airport JOIN `#{bucket.name}` AS route ON route.sourceairport = airport.faa WHERE airport.faa = #{quote(values[0])} AND route.stops = 0 LIMIT #{values[1]} OFFSET #{values[2]}", options)
+    cluster.query("SELECT distinct raw meta(route).id FROM `#{bucket.name}` AS airport JOIN `#{bucket.name}` AS route ON route.sourceairport = airport.faa AND route.type = 'route' WHERE airport.type = 'airport' AND airport.faa = #{quote(values[0])} AND route.stops = 0 LIMIT #{values[1]} OFFSET #{values[2]}", options)
   }
 end

spec/requests/api/v1/airlines_spec.rb

@@ -191,20 +191,20 @@
     let(:offset) { '0' }
     let(:expected_airlines) do
       [
-        { 'callsign' => 'JETBLUE', 'country' => 'United States', 'iata' => 'B6', 'icao' => 'JBU',
-          'name' => 'JetBlue Airways' },
         { 'callsign' => 'SPEEDBIRD', 'country' => 'United Kingdom', 'iata' => 'BA', 'icao' => 'BAW',
           'name' => 'British Airways' },
+        { 'callsign' => 'AIRFRANS', 'country' => 'France', 'iata' => 'AF', 'icao' => 'AFR',
+          'name' => 'Air France' },
         { 'callsign' => 'DELTA', 'country' => 'United States', 'iata' => 'DL', 'icao' => 'DAL',
           'name' => 'Delta Air Lines' },
+        { 'callsign' => 'AMERICAN', 'country' => 'United States', 'iata' => 'AA', 'icao' => 'AAL',
+          'name' => 'American Airlines' },
         { 'callsign' => 'HAWAIIAN', 'country' => 'United States', 'iata' => 'HA', 'icao' => 'HAL',
           'name' => 'Hawaiian Airlines' },
+        { 'callsign' => 'JETBLUE', 'country' => 'United States', 'iata' => 'B6', 'icao' => 'JBU',
+          'name' => 'JetBlue Airways' },
         { 'callsign' => 'FLAGSHIP', 'country' => 'United States', 'iata' => '9E', 'icao' => 'FLG',
           'name' => 'Pinnacle Airlines' },
-        { 'callsign' => 'AMERICAN', 'country' => 'United States', 'iata' => 'AA', 'icao' => 'AAL',
-          'name' => 'American Airlines' },
-        { 'callsign' => 'STARWAY', 'country' => 'France', 'iata' => 'SE', 'icao' => 'SEU',
-          'name' => 'XL Airways France' },
         { 'callsign' => 'SUN COUNTRY', 'country' => 'United States', 'iata' => 'SY', 'icao' => 'SCX',
           'name' => 'Sun Country Airlines' },
         { 'callsign' => 'UNITED', 'country' => 'United States', 'iata' => 'UA', 'icao' => 'UAL',