From 5fde608af4d6acd252685b3b75bcb696e4cf5b1a Mon Sep 17 00:00:00 2001
From: Christian Rorvik <christian@graystonetrading.com>
Date: Tue, 31 Oct 2023 11:14:26 +0100
Subject: [PATCH] Return a null field for missing fields (#31)

---
 src/reader.jl        | 2 +-
 test/reader_tests.jl | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/reader.jl b/src/reader.jl
index 33f8e7a..4949f41 100644
--- a/src/reader.jl
+++ b/src/reader.jl
@@ -156,7 +156,7 @@ end
             offset = field_end
         end
     end
-    throw(KeyError(target))
+    BSONReader(reader.src, 0, BSON_TYPE_NULL, reader.validator, reader.conversions)
 end
 
 # @noinline Base.@constprop :none function Base.getindex(reader::BSONReader, target::Union{AbstractString, Symbol})
diff --git a/test/reader_tests.jl b/test/reader_tests.jl
index 5f6fe39..accb105 100644
--- a/test/reader_tests.jl
+++ b/test/reader_tests.jl
@@ -274,7 +274,7 @@ end
     writer["x"] = 123
     close(writer)
     reader = BSONReader(buf)
-    @test_throws KeyError reader["y"]
+    reader["y"][Any] === nothing
 end
 
 @testset "foreach" begin