Remedy for SELECT COUNT(DISTINCT *) FROM ...

For whatever reason using #joins and #select wreaks havoc
when calling #count without :all.
You'll likely need rails_select_on_includes gem
if you include extras in your #select list.

lib/tabulatr/data/data.rb

@@ -51,7 +51,7 @@ def data_for_table(params, locals: {}, default_order: nil, controller: nil, &blo
     @default_order = default_order
 
     # count
-    total = @relation.count
+    total = @relation.count(:all)
 
     # prepare the query
     apply_filters(filter_params params)

lib/tabulatr/data/pagination.rb

@@ -28,7 +28,7 @@ def apply_pagination(offset: 0, pagesize: nil)
   end
 
   def compute_pagination(page, pagesize)
-    count = @relation.count
+    count = @relation.count(:all)
     count = count.count if count.is_a?(Hash)
     page ||= 1
     pagesize, page = pagesize.to_i, page.to_i