Support conditional access rewriting for value types

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullConditionalNullCoalesceTypeConversion.verified.txt

@@ -0,0 +1,16 @@
+// <auto-generated/>
+using EntityFrameworkCore.Projectables;
+
+namespace EntityFrameworkCore.Projectables.Generated
+#nullable disable
+{
+    [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
+    public static class _Foo_SomeNumber
+    {
+        public static System.Linq.Expressions.Expression<System.Func<global::Foo, int>> Expression()
+        {
+            return (global::Foo fancyClass) => 
+                fancyClass != null ? (fancyClass.FancyNumber ) : (int?)null ?? 3;
+        }
+    }
+}

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableElementAndMemberBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -14,7 +14,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<global::Foo.EntityExtensions.Entity, global::Foo.EntityExtensions.Entity>> Expression()
         {
             return (global::Foo.EntityExtensions.Entity entity) => 
-                entity != null ? (entity.RelatedEntities != null ? (entity.RelatedEntities[0]) : null) : null;
+                entity != null ? (entity.RelatedEntities != null ? (entity.RelatedEntities[0]) : (global::Foo.EntityExtensions.Entity)null) : (global::Foo.EntityExtensions.Entity)null;
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableMemberBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<string, int?>> Expression()
         {
             return (string input) => 
-                input != null ? (input.Length) : null;
+                input != null ? (input.Length) : (int?)null;
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableParameters_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -14,7 +14,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<global::Foo.EntityExtensions.Entity, string>> Expression()
         {
             return (global::Foo.EntityExtensions.Entity entity) => 
-                entity.FullName != null ? (entity.FullName.Substring(entity.FullName != null ? (entity.FullName.IndexOf(' ') ) : null?? 0)) : null;
+                entity.FullName != null ? (entity.FullName.Substring(entity.FullName != null ? (entity.FullName.IndexOf(' ') ) : (int?)null ?? 0)) : (string)null;
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.NullableSimpleElementBinding_WithRewriteSupport_IsBeingRewritten.verified.txt

@@ -13,7 +13,7 @@ namespace EntityFrameworkCore.Projectables.Generated
         public static System.Linq.Expressions.Expression<System.Func<string, char?>> Expression()
         {
             return (string input) => 
-                input != null ? (input[0]) : null;
+                input != null ? (input[0]) : (char?)null;
         }
     }
 }

tests/EntityFrameworkCore.Projectables.Generator.Tests/ProjectionExpressionGeneratorTests.cs

@@ -1542,6 +1542,30 @@ namespace One.Two {
             return Verifier.Verify(result.GeneratedTrees[0].ToString());
         }
 
+        [Fact]
+        public Task NullConditionalNullCoalesceTypeConversion()
+        {
+            // issue: https://github.com/koenbeuk/EntityFrameworkCore.Projectables/issues/48
+
+            var compilation = CreateCompilation(@"
+using EntityFrameworkCore.Projectables;
+
+class Foo {
+    public int? FancyNumber { get; set; }
+
+    [Projectable(NullConditionalRewriteSupport = NullConditionalRewriteSupport.Rewrite)]
+    public static int SomeNumber(Foo fancyClass) => fancyClass?.FancyNumber ?? 3;
+}
+");
+
+            var result = RunGenerator(compilation);
+
+            Assert.Empty(result.Diagnostics);
+            Assert.Single(result.GeneratedTrees);
+
+            return Verifier.Verify(result.GeneratedTrees[0].ToString());
+        }
+
         #region Helpers
 
         Compilation CreateCompilation(string source, bool expectedToCompile = true)