Change default zone from Southwark to Central London

We need the zone to be a top level zone because the map starts zoomed out.

app/models/zone.rb

@@ -1,7 +1,7 @@
 class Zone < ApplicationRecord
-  DEFAULT_ZONE_SOUTHWARK_CERC_ID = 29
+  DEFAULT_ZONE_CENTRAL_LONDON_CERC_ID = 55
 
   def self.default
-    find_by!(cerc_id: DEFAULT_ZONE_SOUTHWARK_CERC_ID)
+    find_by!(cerc_id: DEFAULT_ZONE_CENTRAL_LONDON_CERC_ID)
   end
 end

spec/controllers/forecasts_controller_spec.rb

@@ -1,10 +1,10 @@
 RSpec.describe ForecastsController do
-  let(:southwark) { double("Southwark") }
+  let(:central_london) { double("Central London") }
   let(:barnet) { double("Barnet") }
 
   before do
     allow(Zone).to receive(:find_by).and_return(barnet)
-    allow(Zone).to receive(:default).and_return(southwark)
+    allow(Zone).to receive(:default).and_return(central_london)
     allow(CercForecastService).to receive(:latest_forecasts_for).and_return(forecasts)
   end
 
@@ -14,10 +14,10 @@
 
   describe "GET :show" do
     context "when NO zone is given" do
-      it "obtains forecasts for the default zone (Southwark) from the CercForecastService" do
+      it "obtains forecasts for the default zone (Central London) from the CercForecastService" do
         get :show
 
-        expect(CercForecastService).to have_received(:latest_forecasts_for).with(southwark)
+        expect(CercForecastService).to have_received(:latest_forecasts_for).with(central_london)
       end
     end
 

spec/factories/forecast_zones.rb

@@ -5,8 +5,8 @@
 
 FactoryBot.define do
   factory :forecast_zone do
-    id { 29 }
-    name { "Southwark" }
+    id { 55 }
+    name { "Central London" }
     type { 1 }
 
     initialize_with { new(**attributes) }

spec/feature_steps/zone_steps.rb

@@ -1,3 +1,3 @@
 def create_default_zone
-  FactoryBot.create(:zone, name: "Southwark", cerc_id: 29)
+  FactoryBot.create(:zone, name: "Central London", cerc_id: 55)
 end

spec/fixtures/api/forecasts.rb

@@ -11,11 +11,11 @@ def all_forecasts(forecasts = [])
         }
       end
 
-      def zone_object(zone_id: 29, forecasts: [])
+      def zone_object(zone_id: 55, forecasts: [])
         {
           "forecasts" => forecasts.presence || [zone_forecast],
           "zone_id" => zone_id,
-          "zone_name" => "Southwark",
+          "zone_name" => "Central London",
           "zone_type" => 1
         }
       end

spec/models/zone_spec.rb

@@ -1,9 +1,9 @@
 RSpec.describe Zone do
   describe "::default" do
-    before { FactoryBot.create(:zone, cerc_id: Zone::DEFAULT_ZONE_SOUTHWARK_CERC_ID) }
+    before { FactoryBot.create(:zone, cerc_id: Zone::DEFAULT_ZONE_CENTRAL_LONDON_CERC_ID) }
 
-    it "returns Southwark's Zone record" do
-      expect(Zone.default.cerc_id).to eq(Zone::DEFAULT_ZONE_SOUTHWARK_CERC_ID)
+    it "returns Central London zone record" do
+      expect(Zone.default.cerc_id).to eq(Zone::DEFAULT_ZONE_CENTRAL_LONDON_CERC_ID)
     end
   end
 end

spec/services/cerc_forecast_service_spec.rb

@@ -1,6 +1,6 @@
 RSpec.describe CercForecastService do
   describe "::latest_forecasts_for(zone)" do
-    let(:zone) { FactoryBot.create(:zone, cerc_id: 29) }
+    let(:zone) { FactoryBot.create(:zone, cerc_id: 55) }
 
     context "when the cache is stale" do
       let(:latest_forecasts_from_api) { Fixtures::API.all_forecasts }
@@ -64,8 +64,8 @@
           "wind_am" => 4.9,
           "wind_pm" => 5.3}
        ],
-       "zone_id" => 29,
-       "zone_name" => "Southwark",
+       "zone_id" => 55,
+       "zone_name" => "Central London",
        "zone_type" => 1}
     end