Don't cache has external wiki on secondaries nodes

app/models/project.rb

@@ -812,7 +812,7 @@ class Project < ActiveRecord::Base
   end
 
   def cache_has_external_wiki
-    update_column(:has_external_wiki, services.external_wikis.any?)
+    update_column(:has_external_wiki, services.external_wikis.any?) unless Gitlab::Geo.secondary?
   end
 
   def find_or_initialize_services

spec/models/project_spec.rb

@@ -738,6 +738,35 @@ describe Project, models: true do
       end.not_to change { project.has_external_issue_tracker }
     end
   end
+
+  describe '#cache_has_external_wiki' do
+    let(:project) { create(:empty_project, has_external_wiki: nil) }
+
+    it 'stores true if there is any external_wikis' do
+      services = double(:service, external_wikis: [ExternalWikiService.new])
+      expect(project).to receive(:services).and_return(services)
+
+      expect do
+        project.cache_has_external_wiki
+      end.to change { project.has_external_wiki}.to(true)
+    end
+
+    it 'stores false if there is no external_wikis' do
+      services = double(:service, external_wikis: [])
+      expect(project).to receive(:services).and_return(services)
+
+      expect do
+        project.cache_has_external_wiki
+      end.to change { project.has_external_wiki}.to(false)
+    end
+
+    it 'does not cache data when in a secondary gitlab geo node' do
+      allow(Gitlab::Geo).to receive(:secondary?) { true }
+
+      expect do
+        project.cache_has_external_wiki
+      end.not_to change { project.has_external_wiki }
+    end
   end
 
   describe '#has_wiki?' do