Filter Recent Deployments by Environments

This could be useful for things like finding out which deploys have happened on
production recently, to aid in debugging a live incident.

It would also allow going further back in history, as currently the search is
restricted to the last 25 deployments across all envs, so being able to show 25
deployments in a single env will show more results that would otherwise be
lost.

app/controllers/deployments_controller.rb

@@ -15,7 +15,10 @@ def show
   end
 
   def recent
-    @deployments = Deployment.includes(:application).newest_first.limit(25)
+    env = recent_deployment_params[:environment_filter]
+
+    filtered_deployments = env ? Deployment.where(environment: [env, "#{env} EKS"]) : Deployment
+    @deployments = filtered_deployments.includes(:application).newest_first.limit(25)
   end
 
   def new
@@ -131,4 +134,10 @@ def new_deployment_params
       :environment,
     )
   end
+
+  def recent_deployment_params
+    params.permit(
+      :environment_filter,
+    )
+  end
 end

app/views/deployments/recent.html.erb

@@ -13,5 +13,27 @@
   title: "Recent deployments"
 } %>
 
+<%= form_tag(activity_path, method: :get) do %>
+  <div class="govuk-form-group">
+    <%= render "govuk_publishing_components/components/label", {
+      text: "Filter environment",
+      html_for: "deployment-environment-filter",
+      bold: true
+    } %>
+
+    <%= select_tag "environment_filter",
+      options_for_select(Application::ENVIRONMENTS_ORDER.map(&:capitalize), [params[:environment_filter]]),
+      include_blank: true,
+      id: "deployment-environment-filter",
+      class: "govuk-select"
+    %>
+  </div>
+
+  <%= render "govuk_publishing_components/components/button", {
+    text: "Filter",
+    margin_bottom: true
+  } %>
+<% end %>
+
   <%= render "deployments_list", deploys: @deployments %>
 </section>

test/functional/deployments_controller_test.rb

@@ -24,6 +24,15 @@ class DeploymentsControllerTest < ActionController::TestCase
 
       assert_equal 10, assigns(:deployments).size
     end
+
+    should "assign only filtered environments" do
+      FactoryBot.create(:deployment, application_id: @application.id, environment: "integration EKS")
+      FactoryBot.create(:deployment, application_id: @application.id, environment: "integration")
+
+      get :recent, params: { environment_filter: "Integration" }
+
+      assert_equal 2, assigns(:deployments).size
+    end
   end
 
   context "GET new" do