Connect designs-at-version to versions

ee/app/graphql/types/design_management/version_type.rb

@@ -2,19 +2,36 @@
 
 module Types
   module DesignManagement
-    class VersionType < BaseObject
+    class VersionType < ::Types::BaseObject
       # Just `Version` might be a bit to general to expose globally so adding
       # a `Design` prefix to specify the class exposed in GraphQL
       graphql_name 'DesignVersion'
 
+      description 'A specific version in which designs were added, modified or deleted'
+
       authorize :read_design
 
       field :id, GraphQL::ID_TYPE, null: false,
             description: 'ID of the design version'
       field :sha, GraphQL::ID_TYPE, null: false,
             description: 'SHA of the design version'
-      field :designs, Types::DesignManagement::DesignType.connection_type, null: false,
+
+      field :designs,
+            ::Types::DesignManagement::DesignType.connection_type,
+            null: false,
             description: 'All designs that were changed in the version'
+
+      field :designs_at_version,
+            ::Types::DesignManagement::DesignAtVersionType.connection_type,
+            null: false,
+            description: 'All designs that are visible at this version, as of this version',
+            resolver: ::Resolvers::DesignManagement::Version::DesignsAtVersionResolver
+
+      field :design_at_version,
+            ::Types::DesignManagement::DesignAtVersionType,
+            null: false,
+            description: 'A particular design as of this version, provided it is visible at this version',
+            resolver: ::Resolvers::DesignManagement::Version::DesignsAtVersionResolver.single
     end
   end
 end

ee/spec/graphql/types/design_management/version_type_spec.rb

@@ -3,7 +3,11 @@
 require 'spec_helper'
 
 describe GitlabSchema.types['DesignVersion'] do
+  let(:expected_fields) do
+    %i[id sha designs design_at_version designs_at_version]
+  end
+
   it { expect(described_class).to require_graphql_authorizations(:read_design) }
 
-  it { expect(described_class).to have_graphql_fields(:id, :sha, :designs) }
+  it { expect(described_class).to have_graphql_fields(*expected_fields) }
 end