Fetch oldest authored_at correctly instead of oldest authored_at per …

…page

Fixes #4448

Previously, the "since date" was using oldest `version.authored_at` for a given
page. This change fixes it to get the oldest `version.authored_at` in
the database. Because `authored_at` depends on either `built_at` or
`created_at`, I fetch both and take the min. This should only be 2
additional queries of 1 record each.

I modified existing tests to check for the "versions since" text and
also have 2 pages of actual content.

app/controllers/versions_controller.rb

@@ -3,6 +3,7 @@ class VersionsController < ApplicationController
 
   def index
     set_page
+    set_oldest_version_date
     @versions = @rubygem.versions.by_position.page(@page).per(Gemcutter::VERSIONS_PER_PAGE)
   end
 
@@ -14,4 +15,12 @@ def show
     @on_version_page = true
     render "rubygems/show"
   end
+
+  private
+
+  def set_oldest_version_date
+    oldest_created_at = @rubygem.versions.order(:created_at).first
+    oldest_built_at = @rubygem.versions.order(:built_at).first
+    @oldest_version_date = [oldest_created_at, oldest_built_at].compact.map(&:authored_at).min
+  end
 end

app/views/versions/index.html.erb

@@ -4,7 +4,7 @@
     <p><%= t('.not_hosted_notice') %></p>
   </div>
 <% else %>
-  <h3 class="t-list__heading"><%= t('.versions_since', :count => @versions.total_count, :since => nice_date_for(@versions.map(&:authored_at).min)) %>:</h3>
+  <h3 class="t-list__heading"><%= t('.versions_since', :count => @versions.total_count, :since => nice_date_for(@oldest_version_date)) %>:</h3>
   <div class="versions">
     <ul class="t-list__items">
       <%= render @versions %>

test/functional/versions_controller_test.rb

@@ -87,27 +87,37 @@ class VersionsControllerTest < ActionController::TestCase
       end
 
       assert_select ".gem__version__date sup", text: "*", count: 1
+
+      assert_select ".t-list__heading", text: /1 versions since January 01, 2000/, count: 1
     end
   end
 
   context "on GET to index" do
     setup do
       @rubygem = create(:rubygem)
-      create(:version, number: "1.1.2", rubygem: @rubygem)
+      @oldest_created_at = Date.parse("2010-01-01")
+      create(:version, number: "1.1.2", rubygem: @rubygem, position: 0)
+      create(:version, number: "1.1.1", rubygem: @rubygem, position: 1, created_at: @oldest_created_at)
     end
 
     should "get paginated result" do
-      # first page includes the only version
-      get :index, params: { rubygem_id: @rubygem.name }
-
-      assert_response :success
-      assert page.has_content?("1.1.2")
-
-      # second page does not include the only version
-      get :index, params: { rubygem_id: @rubygem.name, page: 2 }
-
-      assert_response :success
-      refute page.has_content?("1.1.2")
+      stub_const(Gemcutter, :VERSIONS_PER_PAGE, 1) do
+        # first page only includes the version at position 0
+        get :index, params: { rubygem_id: @rubygem.name }
+
+        assert_response :success
+        assert page.has_content?("1.1.2")
+        refute page.has_content?("1.1.1")
+        assert_select ".t-list__heading", text: /2 versions since January 01, 2010/, count: 1
+
+        # second page only includes the version at position 1
+        get :index, params: { rubygem_id: @rubygem.name, page: 2 }
+
+        assert_response :success
+        refute page.has_content?("1.1.2")
+        assert page.has_content?("1.1.1")
+        assert_select ".t-list__heading", text: /2 versions since January 01, 2010/, count: 1
+      end
     end
   end