From adb65f6bc267e06e7839c6d2ffacd13a1528a757 Mon Sep 17 00:00:00 2001
From: Martin Villagra <martin.villagra@leapsight.com>
Date: Sat, 2 Dec 2017 10:22:52 -0300
Subject: [PATCH] Fix find_by when offset is greater than available objects

---
 src/adapter_test_helpers/sumo_basic_test_helper.erl | 2 ++
 src/adapters/sumo_store_mnesia.erl                  | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/adapter_test_helpers/sumo_basic_test_helper.erl b/src/adapter_test_helpers/sumo_basic_test_helper.erl
index 885c957..5c7b922 100644
--- a/src/adapter_test_helpers/sumo_basic_test_helper.erl
+++ b/src/adapter_test_helpers/sumo_basic_test_helper.erl
@@ -108,6 +108,8 @@ find_by(Config) ->
   %% Check pagination
   Results1 = sumo:find_by(Name, [], 3, 1),
   [_, _, _] = Results1,
+  [_, _, _, _, _, _, _] = sumo:find_by(Name, [], 1000, 1),
+  [] = sumo:find_by(Name, [], 1, 1000),
 
   %% This test is #177 github issue related
   [_, _, _, _, _, _, _, _] = sumo:find_by(Name, []),
diff --git a/src/adapters/sumo_store_mnesia.erl b/src/adapters/sumo_store_mnesia.erl
index 47e759b..83906fc 100644
--- a/src/adapters/sumo_store_mnesia.erl
+++ b/src/adapters/sumo_store_mnesia.erl
@@ -188,8 +188,10 @@ find_by(DocName, Conditions, [], Limit, Offset, State) ->
   end,
   TransactionL = fun() ->
     case mnesia:select(DocName, MatchSpec, Offset + Limit, read) of
-      {ManyItems, _Cont} ->
+      {ManyItems, _Cont} when length(ManyItems) >= Offset ->
         lists:sublist(ManyItems, Offset + 1, Limit);
+      {_ManyItems, _Cont} ->
+        [];
       '$end_of_table' ->
         []
     end