#434

backend/app/representations/counts_version_repr.rb

@@ -1,11 +1,13 @@
 # Counts uses recorded values only; history/diff endpoints retain their own contract.
 class CountsVersionRepr
-  def self.many(rows, resource:, language_code:)
-    new(rows.to_a, resource:, language_code:).serialise
+  def self.many(rows, resource:, language_code:, at: nil, inclusive: true)
+    new(rows.to_a, resource:, language_code:, at:, inclusive:).serialise
   end
 
-  def initialize(rows, resource:, language_code:)
+  def initialize(rows, resource:, language_code:, at:, inclusive:)
     @rows = rows
+    @at = at
+    @inclusive = inclusive
     @resource = resource
     @language = language_code
     @users = User.where(id: rows.map(&:created_by_user_id).compact).pluck(:id, :name).to_h
@@ -45,7 +47,11 @@ class CountsVersionRepr
         .uniq
     pairs.each_slice(500) do |batch|
       placeholders = batch.map { '(?, ?)' }.join(', ')
-      TagVersion.where(["(tag_id, version_no) IN (#{ placeholders })", *batch.flatten])
+      scope = TagVersion.all
+      if @at
+        scope = scope.where("created_at #{ @inclusive ? '<=' : '<' } ?", @at)
+      end
+      scope.where(["(tag_id, version_no) IN (#{ placeholders })", *batch.flatten])
           .select(:tag_id, :version_no, :name, :category, :names).each do |version|
         @tag_versions[[version.tag_id, version.version_no]] = version
       end