feat: infer default as non-null config

Author: mattkhan

lib/anchor/config.rb

@@ -8,7 +8,8 @@ class Config
       :empty_relationship_type,
       :use_type_as_schema_name,
       :maybe_as_union,
-      :array_bracket_notation
+      :array_bracket_notation,
+      :infer_default_as_non_null
 
     def initialize
       @ar_column_to_type = nil
@@ -20,6 +21,7 @@ def initialize
       @use_type_as_schema_name = nil
       @maybe_as_union = nil
       @array_bracket_notation = nil
+      @infer_default_as_non_null = nil
     end
   end
 end

lib/anchor/resource.rb

@@ -91,6 +91,8 @@ def anchor_attributes_properties(included_fields:)
                  end
                end
               type.type
+            elsif type.is_a?(Anchor::Types::Maybe) && Anchor.config.infer_default_as_non_null
+              column.default.present? || column.default_function.present? && column.instance_variable_get(:@generated).blank? ? type.type : type
             else
               type
             end

spec/example/app/resources/exhaustive_resource.rb

@@ -42,6 +42,8 @@ class AssertedObject < Types::Object
   attribute :model_overridden
   attribute :resource_overridden
   attribute :with_comment
+  attribute :defaulted_boolean
+  attribute :defaulted_at
 
   class LinkSchema < Anchor::Types::Object
     property :self, Anchor::Types::String

spec/example/config/initializers/anchor.rb

@@ -3,6 +3,7 @@ module Anchor
     c.field_case = :camel_without_inflection
     c.use_active_record_comment = true
     c.use_active_record_validations = true
+    c.infer_default_as_non_null = true
     c.infer_nullable_relationships_as_optional = true
 
     c.ar_column_to_type = lambda { |column|

spec/example/db/migrate/20250730175920_add_with_default_to_exhaustives.rb

@@ -0,0 +1,5 @@
+class AddWithDefaultToExhaustives < ActiveRecord::Migration[8.0]
+  def change
+    add_column :exhaustives, :defaulted_boolean, :boolean, default: false
+  end
+end

spec/example/db/migrate/20250730180611_add_with_default_function_to_exhaustives.rb

@@ -0,0 +1,5 @@
+class AddWithDefaultFunctionToExhaustives < ActiveRecord::Migration[8.0]
+  def change
+    add_column :exhaustives, :defaulted_at, :datetime, default: -> { "NOW()" }
+  end
+end

spec/example/db/schema.rb

@@ -53,6 +53,8 @@ type Model = {
   resourceOverridden: unknown;
   /** This is a comment. */
   withComment: Maybe<string>;
+  defaultedBoolean: boolean;
+  defaultedAt: string;
   relationships: {};
   meta: {
     some_count: number;

spec/example/test/files/multifile/Exhaustive.ts

@@ -1 +1 @@
-{"shared.ts":"e42275c1453e00f368131821b3e4de915d6c5c789a8fc5c72967ddf8c31ad77b","Comment.ts":"fec6ae5197b65afe3fed510a393b7819e288f33366bc34aca1622833c5030ba6","User.ts":"ce80524eb520622e37af4aa9a2b35e49a50cb80bf4ea9921e818631e8a541738","Post.ts":"74d50a09806ff7496c168f2b9b4d6cea64111f42f38effa12464e5ad933c1303","Exhaustive.ts":"ac90628b54e7278d63839fdd4db3d3cbfae9d9e996fb065e5a5d2b756052fe66"}
+{"shared.ts":"e42275c1453e00f368131821b3e4de915d6c5c789a8fc5c72967ddf8c31ad77b","Comment.ts":"fec6ae5197b65afe3fed510a393b7819e288f33366bc34aca1622833c5030ba6","User.ts":"ce80524eb520622e37af4aa9a2b35e49a50cb80bf4ea9921e818631e8a541738","Post.ts":"74d50a09806ff7496c168f2b9b4d6cea64111f42f38effa12464e5ad933c1303","Exhaustive.ts":"ff0ed2ee4d354256bce9fef2cba6ae6f82a024fe1755daba545ec8f68f87bad3"}