fix pagination

apps/explorer/lib/explorer/chain.ex

@@ -287,15 +287,14 @@ defmodule Explorer.Chain do
         options \\ []
       )
       when is_list(options) do
-    paging_options = Keyword.get(options, :paging_options)
+    paging_options = Keyword.get(options, :paging_options) || %PagingOptions{page_size: 50}
 
     {block_number, transaction_index, log_index} = paging_options.key || {BlockNumberCache.max_number(), 0, 0}
 
     query =
-      from(transaction in Transaction,
-        inner_join: log in assoc(transaction, :logs),
-        order_by: [desc: transaction.block_number, desc: transaction.index],
-        preload: [:logs],
+      from(log in Log,
+        inner_join: transaction in assoc(log, :transaction),
+        order_by: [desc: transaction.block_number, desc: transaction.index, asc: log.index],
         where:
           (transaction.from_address_hash == ^address_hash or transaction.to_address_hash == ^address_hash or
              transaction.created_contract_address_hash == ^address_hash) and log.address_hash == ^address_hash and
@@ -303,13 +302,11 @@ defmodule Explorer.Chain do
                (transaction.block_number == ^block_number and transaction.index > ^transaction_index) or
                (transaction.block_number == ^block_number and transaction.index == ^transaction_index and
                   log.index > ^log_index)),
-        limit: ^paging_options.page_size,
-        distinct: transaction.hash
+        limit: ^paging_options.page_size
       )
 
     query
     |> Repo.all()
-    |> Enum.flat_map(fn transaction -> transaction.logs end)
     |> Enum.take(paging_options.page_size)
   end