diff --git a/lib/resource/resource.ex b/lib/resource/resource.ex
index ffae4a0b..d34d1e8f 100644
--- a/lib/resource/resource.ex
+++ b/lib/resource/resource.ex
@@ -2456,7 +2456,7 @@ defmodule AshGraphql.Resource do
                     name: to_string(name),
                     type:
                       if Keyword.get(
-                           constraints || [],
+                           attribute,
                            :allow_nil?,
                            true
                          ) do
@@ -2471,7 +2471,7 @@ defmodule AshGraphql.Resource do
                 ]
               }
 
-            {type, constraints} ->
+            {type, _} ->
               {types,
                [
                  %Absinthe.Blueprint.Schema.FieldDefinition{
@@ -2481,7 +2481,7 @@ defmodule AshGraphql.Resource do
                    name: to_string(name),
                    type:
                      if Keyword.get(
-                          constraints || [],
+                          attribute,
                           :allow_nil?,
                           true
                         ) do
@@ -2538,7 +2538,7 @@ defmodule AshGraphql.Resource do
                     __reference__: AshGraphql.Resource.ref(env),
                     name: to_string(name),
                     type:
-                      if Keyword.get(constraints || [], :allow_nil?, true) do
+                      if Keyword.get(attribute, :allow_nil?, true) do
                         nested_type_name
                       else
                         %Absinthe.Blueprint.TypeReference.NonNull{
@@ -2550,7 +2550,7 @@ defmodule AshGraphql.Resource do
                 ]
               }
 
-            {type, constraints} ->
+            {type, _} ->
               {types,
                [
                  %Absinthe.Blueprint.Schema.InputValueDefinition{
@@ -2559,7 +2559,7 @@ defmodule AshGraphql.Resource do
                    __reference__: AshGraphql.Resource.ref(env),
                    name: to_string(name),
                    type:
-                     if Keyword.get(constraints || [], :allow_nil?, true) do
+                     if Keyword.get(attribute, :allow_nil?, true) do
                        do_field_type(type, nil, nil, false)
                      else
                        %Absinthe.Blueprint.TypeReference.NonNull{
diff --git a/test/support/resources/constrained_map.ex b/test/support/resources/constrained_map.ex
index 70328759..1a91775e 100644
--- a/test/support/resources/constrained_map.ex
+++ b/test/support/resources/constrained_map.ex
@@ -6,9 +6,7 @@ defmodule AshGraphql.Test.ConstrainedMap do
       fields: [
         foo_bar: [
           type: :string,
-          constraints: [
-            allow_nil?: false
-          ]
+          allow_nil?: false
         ],
         baz: [
           type: :integer
diff --git a/test/support/resources/map_types.ex b/test/support/resources/map_types.ex
index bc66e1d1..f11ae12c 100644
--- a/test/support/resources/map_types.ex
+++ b/test/support/resources/map_types.ex
@@ -12,9 +12,7 @@ defmodule AshGraphql.Test.MapTypes do
         fields: [
           foo: [
             type: :string,
-            constraints: [
-              allow_nil?: false
-            ]
+            allow_nil?: false
           ],
           bar: [
             type: :integer
@@ -43,9 +41,7 @@ defmodule AshGraphql.Test.MapTypes do
           fields: [
             foo: [
               type: :string,
-              constraints: [
-                allow_nil?: false
-              ]
+              allow_nil?: false
             ],
             bar: [
               type: :integer