Allow SshHostKey.find_by to accept string keys

app/models/ssh_host_key.rb

@@ -26,6 +26,7 @@ class SshHostKey
   self.reactive_cache_lifetime = 10.minutes
 
   def self.find_by(opts = {})
+    opts = HashWithIndifferentAccess.new(opts)
     return nil unless opts.key?(:id)
 
     project_id, url = opts[:id].split(':', 2)

spec/models/ssh_host_key_spec.rb

@@ -56,6 +56,29 @@ describe SshHostKey do
     end
   end
 
+  describe '.find_by' do
+    let(:project) { create(:project) }
+    let(:url) { 'ssh://invalid.invalid:2222' }
+
+    let(:finding_id) { [project.id, url].join(':') }
+
+    it 'accepts a string key' do
+      result = described_class.find_by('id' => finding_id)
+
+      expect(result).to be_a(described_class)
+      expect(result.project).to eq(project)
+      expect(result.url.to_s).to eq(url)
+    end
+
+    it 'accepts a symbol key' do
+      result = described_class.find_by(id: finding_id)
+
+      expect(result).to be_a(described_class)
+      expect(result.project).to eq(project)
+      expect(result.url.to_s).to eq(url)
+    end
+  end
+
   describe '#fingerprints', :use_clean_rails_memory_store_caching do
     it 'returns an array of indexed fingerprints when the cache is filled' do
       stub_reactive_cache(ssh_host_key, known_hosts: known_hosts)