fix: use correct user defined mapping configuration for nullable disa…

…bled queryable mappings

src/Riok.Mapperly/Descriptors/InlineExpressionMappingBuilderContext.cs

@@ -15,8 +15,8 @@ namespace Riok.Mapperly.Descriptors;
 /// </summary>
 public class InlineExpressionMappingBuilderContext : MappingBuilderContext
 {
-    public InlineExpressionMappingBuilderContext(MappingBuilderContext ctx, TypeMappingKey mappingKey)
-        : base(ctx, ctx.FindMapping(mappingKey) as IUserMapping, null, mappingKey, false) { }
+    public InlineExpressionMappingBuilderContext(MappingBuilderContext ctx, IUserMapping? userMapping, TypeMappingKey mappingKey)
+        : base(ctx, userMapping, null, mappingKey, false) { }
 
     private InlineExpressionMappingBuilderContext(
         InlineExpressionMappingBuilderContext ctx,

src/Riok.Mapperly/Descriptors/MappingBuilders/QueryableMappingBuilder.cs

@@ -1,5 +1,7 @@
+using Microsoft.CodeAnalysis;
 using Riok.Mapperly.Abstractions;
 using Riok.Mapperly.Descriptors.Mappings;
+using Riok.Mapperly.Descriptors.Mappings.UserMappings;
 using Riok.Mapperly.Diagnostics;
 using Riok.Mapperly.Helpers;
 
@@ -12,10 +14,18 @@ public static class QueryableMappingBuilder
         if (!ctx.IsConversionEnabled(MappingConversionType.Queryable))
             return null;
 
-        if (!TryBuildMappingKey(ctx, out var mappingKey))
+        if (!ctx.Source.ImplementsGeneric(ctx.Types.Get(typeof(IQueryable<>)), out var sourceQueryable))
             return null;
 
-        var inlineCtx = new InlineExpressionMappingBuilderContext(ctx, mappingKey);
+        if (!ctx.Target.ImplementsGeneric(ctx.Types.Get(typeof(IQueryable<>)), out var targetQueryable))
+            return null;
+
+        var sourceType = sourceQueryable.TypeArguments[0];
+        var targetType = targetQueryable.TypeArguments[0];
+
+        var mappingKey = TryBuildMappingKey(ctx, sourceType, targetType);
+        var userMapping = ctx.FindMapping(sourceType, targetType) as IUserMapping;
+        var inlineCtx = new InlineExpressionMappingBuilderContext(ctx, userMapping, mappingKey);
         var mapping = inlineCtx.BuildMapping(mappingKey, MappingBuildingOptions.KeepUserSymbol);
         if (mapping == null)
             return null;
@@ -28,31 +38,17 @@ public static class QueryableMappingBuilder
         return new QueryableProjectionMapping(ctx.Source, ctx.Target, mapping);
     }
 
-    private static bool TryBuildMappingKey(MappingBuilderContext ctx, out TypeMappingKey mappingKey)
+    private static TypeMappingKey TryBuildMappingKey(MappingBuilderContext ctx, ITypeSymbol sourceType, ITypeSymbol targetType)
     {
-        mappingKey = default;
-        if (!ctx.Source.ImplementsGeneric(ctx.Types.Get(typeof(IQueryable<>)), out var sourceQueryable))
-            return false;
-
-        if (!ctx.Target.ImplementsGeneric(ctx.Types.Get(typeof(IQueryable<>)), out var targetQueryable))
-            return false;
-
         // if nullable reference types are disabled
         // and there was no explicit nullable annotation,
         // the non-nullable variant is used here.
         // Otherwise, this would lead to a select like source.Select(x => x == null ? throw ... : new ...)
         // which is not expected in this case.
         // see also https://github.com/riok/mapperly/issues/1196
-        var sourceType = ctx.SymbolAccessor.NonNullableIfNullableReferenceTypesDisabled(
-            sourceQueryable.TypeArguments[0],
-            ctx.UserMapping?.SourceType
-        );
-        var targetType = ctx.SymbolAccessor.NonNullableIfNullableReferenceTypesDisabled(
-            targetQueryable.TypeArguments[0],
-            ctx.UserMapping?.TargetType
-        );
-
-        mappingKey = new TypeMappingKey(sourceType, targetType);
-        return true;
+        sourceType = ctx.SymbolAccessor.NonNullableIfNullableReferenceTypesDisabled(sourceType, ctx.UserMapping?.SourceType);
+        targetType = ctx.SymbolAccessor.NonNullableIfNullableReferenceTypesDisabled(targetType, ctx.UserMapping?.TargetType);
+
+        return new TypeMappingKey(sourceType, targetType);
     }
 }

test/Riok.Mapperly.Tests/Mapping/QueryableProjectionNullableTest.cs

@@ -181,4 +181,38 @@ public Task RecordToClassDisabledNullableContext()
 
         return TestHelper.VerifyGenerator(source, TestHelperOptions.DisabledNullable);
     }
+
+    [Fact]
+    public Task RecordToRecordMemberMappingDisabledNullableContext()
+    {
+        var source = TestSourceBuilder.MapperWithBodyAndTypes(
+            """
+            public partial System.Linq.IQueryable<B> Map(System.Linq.IQueryable<A> q);
+
+            [MapProperty(nameof(A.Value), nameof(B.OtherValue)]
+            private partial B Map(A source);
+            """,
+            "public record A(string Value);",
+            "public record B(string OtherValue);"
+        );
+
+        return TestHelper.VerifyGenerator(source, TestHelperOptions.DisabledNullable);
+    }
+
+    [Fact]
+    public Task ClassToClassMemberMappingDisabledNullableContext()
+    {
+        var source = TestSourceBuilder.MapperWithBodyAndTypes(
+            """
+            public partial System.Linq.IQueryable<B> Map(System.Linq.IQueryable<A> q);
+
+            [MapProperty(nameof(A.Value), nameof(B.OtherValue)]
+            private partial B Map(A source);
+            """,
+            "public class A { public string Value {get; set;} }",
+            "public class B { public string OtherValue {get; set;} }"
+        );
+
+        return TestHelper.VerifyGenerator(source, TestHelperOptions.DisabledNullable);
+    }
 }

test/Riok.Mapperly.Tests/_snapshots/QueryableProjectionNullableTest.ClassToClassMemberMappingDisabledNullableContext#Mapper.g.verified.cs

@@ -0,0 +1,31 @@
+//HintName: Mapper.g.cs
+// <auto-generated />
+#nullable enable
+public partial class Mapper
+{
+    [global::System.CodeDom.Compiler.GeneratedCode("Riok.Mapperly", "0.0.1.0")]
+    public partial global::System.Linq.IQueryable<global::B?>? Map(global::System.Linq.IQueryable<global::A?>? q)
+    {
+        if (q == null)
+            return default;
+#nullable disable
+        return System.Linq.Queryable.Select(
+            q,
+            x => new global::B()
+            {
+                OtherValue = x.Value,
+            }
+        );
+#nullable enable
+    }
+
+    [global::System.CodeDom.Compiler.GeneratedCode("Riok.Mapperly", "0.0.1.0")]
+    private partial global::B? Map(global::A? source)
+    {
+        if (source == null)
+            return default;
+        var target = new global::B();
+        target.OtherValue = source.Value;
+        return target;
+    }
+}

test/Riok.Mapperly.Tests/_snapshots/QueryableProjectionNullableTest.RecordToRecordMemberMappingDisabledNullableContext#Mapper.g.verified.cs

@@ -0,0 +1,24 @@
+//HintName: Mapper.g.cs
+// <auto-generated />
+#nullable enable
+public partial class Mapper
+{
+    [global::System.CodeDom.Compiler.GeneratedCode("Riok.Mapperly", "0.0.1.0")]
+    public partial global::System.Linq.IQueryable<global::B?>? Map(global::System.Linq.IQueryable<global::A?>? q)
+    {
+        if (q == null)
+            return default;
+#nullable disable
+        return System.Linq.Queryable.Select(q, x => new global::B(x.Value));
+#nullable enable
+    }
+
+    [global::System.CodeDom.Compiler.GeneratedCode("Riok.Mapperly", "0.0.1.0")]
+    private partial global::B? Map(global::A? source)
+    {
+        if (source == null)
+            return default;
+        var target = new global::B(source.Value);
+        return target;
+    }
+}